CAT-5 Receiver with
Adjustable Line Equalization
AD8128
Data Sheet
FEATURES
FUNCTIONAL BLOCK DIAGRAM
AD8128
HPF
VIN+
VOUT
HPF
VIN–
LPF
VPEAK
VGAIN
VOFFSET
05699-001
Tuned to compensate for Category-5 (CAT-5) cable losses
Up to 100 meters at 120 MHz
2 voltage controlled frequency response adjustment pins
High frequency peaking adjustment
Broadband gain adjustment
2700 V/μs slew rate
Low output noise
1.5 mV rms integrated noise (1 GHz) at 100 meters
equalized bandwidth
DC output offset adjust
Low offset voltage error: 7 mV typ
Equalized pass-band ripple ±1 dB to 70 MHz
Input: differential or single ended
Supply current: 24 mA on ±5 V
Small 8-lead 3 mm × 3 mm LFCSP
Figure 1.
APPLICATIONS
Keyboard-video-mouse (KVM)
RGB video over unshielded twisted pair (UTP) cable receivers
Professional video projection and distribution
Security video
GENERAL DESCRIPTION
The AD8128 is a high speed, differential receiver/equalizer that
compensates for the transmission losses of unshielded twisted pair
(UTP) CAT-5 cables. Various frequency dependent gain stages
are summed together to best approximate the inverse frequency
response of CAT-5/CAT-5e cable. An equalized bandwidth of
120 MHz can be achieved for 100 meters of cable.
The AD8128 can be used as a standalone receiver/equalizer or
in conjunction with the AD8143, triple differential receiver, to
provide a complete low cost solution for receiving RGB over
UTP cable in such applications as KVM.
The AD8128 has three control pins for optimal CAT-5/CAT-5e
compensation. The equalized cable length is directly proportional
to the voltage applied to the VPEAK pin, which controls the amount
of high frequency peaking. VGAIN adjusts the broadband gain
from 0 dB to 3 dB, compensating for the resistive cable loss.
VOFFSET allows the output to be shifted by ±2.5 V, adding
flexibility for dc-coupled systems.
Low integrated output noise and offset voltage adjust make the
AD8128 an excellent choice for dc-coupled wideband RGB-overCAT-5 applications. For systems where the UTP cable is longer
than 100 meters, two AD8128 devices can be cascaded to
compensate for up to 200 meters of CAT-5/CAT-5e.
The AD8128 is available in a 3 mm × 3 mm 8-lead LFCSP and
is rated to operate over the extended temperature range of
−40°C to +85°C.
Rev. A
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Technical Support
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AD8128
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Theory of Operation .........................................................................9
Applications ....................................................................................... 1
Input Common-Mode Voltage Range Considerations ............9
Functional Block Diagram .............................................................. 1
Applications Information .............................................................. 10
General Description ......................................................................... 1
KVM Applications ..................................................................... 10
Revision History ............................................................................... 2
DC Control Pins ......................................................................... 10
Specifications..................................................................................... 3
Cascaded Applications............................................................... 11
Absolute Maximum Ratings ............................................................ 4
Exposed Pad (EP) ....................................................................... 11
Thermal Resistance ...................................................................... 4
Layout and Power Supply Decoupling Considerations ......... 11
ESD Caution .................................................................................. 4
Evaluation Boards ...................................................................... 11
Pin Configuration and Function Descriptions ............................. 5
Outline Dimensions ....................................................................... 12
Typical Performance Characteristics ............................................. 6
Ordering Guide .......................................................................... 12
Test Circuit .................................................................................... 8
REVISION HISTORY
6/2016—Rev. 0 to Rev. A
Changes to Figure 3 and Table 4 ..................................................... 5
Updated Outline Dimensions ....................................................... 12
Changes to Ordering Guide .......................................................... 12
10/2005—Revision 0: Initial Version
Rev. A | Page 2 of 12
Data Sheet
AD8128
SPECIFICATIONS
TA = 25°C, VS = ±5 V, RL = 150 Ω, Belden cable, VOFFSET = 0 V, VGAIN and VPEAK set to optimized settings (see Figure 4), unless otherwise noted.
Table 1.
Parameter
DYNAMIC PERFORMANCE
–3 dB Large Signal Bandwidth
±1 dB Equalized Bandwidth Flatness
Rise/Fall Time
Rise/Fall Time
Settling Time to 2%
Settling Time to 2%
Integrated Output Voltage Noise
DC PERFORMANCE
Input Bias Current
VOFFSET Pin Current
VGAIN Pin Current
VPEAK Pin Current
INPUT CHARACTERISTICS
Input Differential Voltage
Input Common-Mode Voltage
Input Resistance
Input Capacitance
Common-Mode Rejection Ratio (CMRR)
ADJUSTMENT PINS
VPEAK Input Voltage
Maximum Peak Gain
VGAIN Input
Maximum Broadband Gain
VOFFSET Input Range
VOFFSET to VOUT Gain
OUTPUT CHARACTERISTICS
Output Voltage Swing
Output Offset Voltage
Output Offset Voltage Drift
Short-Circuit Output Current
POWER SUPPLY
Operating Voltage Range
Quiescent Supply Current, ICC/IEE
Supply Current Drift, ICC/IEE
+Power Supply Rejection Ratio (PSRR)
−Power Supply Rejection Ratio (PSRR)
TEMPERATURE RANGE
Test Conditions/Comments
Min
VOUT = 2 V p-p, 100 meter CAT-5
VOUT = 2 V p-p
VOUT = 2 V step, 50 meter CAT-5
VOUT = 2 V step, 100 meter CAT-5
VOUT = 2 V step, 50 meter CAT-5
VOUT = 2 V step, 100 meter CAT-5
VPEAK = 0.9 V, VGAIN = 225 mV, BW = 1 GHz
Typ
120
70
2
3.6
26
36.4
1.5
15.5
1.7
2
4.2
Common mode
Differential
200 kHz, ΔVOUT/ΔVIN, cm
−63
Relative to ground
At 120 MHz, VPEAK = 1 V
Relative to ground
VGAIN = 1 V
Relative to ground
0
VOFFSET = 0 V, RTO
1
3
±2.5
1
−2.55
−10.9
+7
−5.5
100
−48
−48
−40
+24/−21
+86/−77
−59
−61
µA
µA
µA
µA
V
V
kΩ
kΩ
pF
dB
1
±4.5
Rev. A | Page 3 of 12
24
8.2
3.4
6.8
±2.8
±3.0
380
675
1.7
−74
0
Unit
MHz
MHz
ns
ns
ns
ns
mV rms
20
At ±5 V
RTO
RTO
Max
V
dB
V
dB
V
V/V
+2.7
+18.7
V
mV
µV/°C
mA
±5.5
+31/−27
V
mA
µA/°C
dB
dB
°C
+85
AD8128
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Supply Voltage
Input Voltage
VPEAK and VGAIN Control Pins
VOFFSET Control Pins
Operating Temperature Range
Storage Temperature Range
Lead Temperature (Soldering 10 sec)
Junction Temperature
Rating
±5.5 V
±VS
−3 V to +VS
±VS
−40°C to +85°C
−65°C to +125°C
300°C
150°C
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.
THERMAL RESISTANCE
The power dissipated in the package (PD) is the sum of the
quiescent power dissipation and the power dissipated in the
package due to the load drive for the output. The quiescent power
is the voltage between the supply pins (VS) times the quiescent
current (IS). The power dissipated due to the load drive depends
upon the particular application. For each output, the power due
to load drive is calculated by multiplying the load current by the
associated voltage drop across the
Airflow increases heat dissipation, effectively reducing θJA. Also,
more metal directly in contact with the package leads from metal
traces, through-holes, ground, and power planes reduces the θJA.
The exposed pad on the underside of the package must be
soldered to a pad on the PCB surface, which is thermally connected
to a copper plane to achieve the specified θJA.
Figure 2 shows the maximum safe power dissipation in the package
vs. the ambient temperature for the 8-lead LFCSP (48.5°C/W) on a
JEDEC standard 4-layer board with the underside pad soldered to a
pad that is thermally connected to a PCB plane. Extra thermal
relief is required for operation at high supply voltages.
3.0
Table 3. Thermal Resistance
Package Type
8-Lead LFCSP
θJA
77
θJC
14
Unit
°C/W
Maximum Power Dissipation
The maximum safe power dissipation in the AD8128 package is
limited by the associated rise in junction temperature (TJ) on the
die. At approximately 150°C, which is the glass transition temperature, the plastic changes the properties. Even temporarily
exceeding this temperature limit can change the stresses that the
package exerts on the die, permanently shifting the parametric
performance of the AD8128. Exceeding a junction temperature
of 150°C for an extended period can result in changes in the
silicon devices potentially causing failure.
2.5
2.0
1.5
1.0
0.5
0
–40 –30 –20 –10
05699-020
MAXIMUM POWER DISSIPATION (W)
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
0
10
20
30
40
50
60
70
80
90 100 110 120 130
AMBIENT TEMPERATURE (°C)
Figure 2. Maximum Power Dissipation vs. Temperature
ESD CAUTION
Rev. A | Page 4 of 12
Data Sheet
AD8128
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
VIN+ 1
VGAIN 3
VPEAK 4
8 VS+
AD8128
TOP VIEW
(Not to Scale)
7 VOFFSET
6 VOUT
5 VS–
NOTES
1. THE EXPOSED PAD MUST BE ELECTRICALLY
CONNECTED TO GROUND TO PROVIDE A
GROUND REFERENCE TO THE DEVICE (SEE
THE EXPOSED PAD (EP) SECTION).
05699-002
VIN– 2
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
1
2
3
4
5
6
7
8
EP
Mnemonic
VIN+
VIN−
VGAIN
VPEAK
VS−
VOUT
VOFFSET
VS+
GND
Description
Positive Equalizer Input
Negative Equalizer Input
0 V to 1 V Broadband Gain Control
0 V to 1 V High Frequency Gain Control
Negative Power Supply
Equalizer Output
DC Offset Adjust
Positive Power Supply
Ground Reference and Thermal Pad. The exposed pad must be electrically connected to ground to provide a
ground reference to the device (see the Exposed Pad (EP) section).
Rev. A | Page 5 of 12
AD8128
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25°C, VS = ±5 V, RL = 150 Ω, Belden cable, VOFFSET = 0 V, unless otherwise noted.
1.0
0.9
1
0
0.8
VPEAK
0.6
0.5
0.4
0.3
–4
–5
–6
–8
0.1
0
10
20
30
40
50
60
70
80
90
–9
–10
0.1
100
VPEAK AND VGAIN SETTINGS ARE CONSISTENT
WITH OPTIMIZED SETTINGS IN FIGURE 4
VOUT = 2V p-p
RL = 150Ω
FREQUENCY (MHz)
Figure 7. Equalized Frequency Response for 50 M Cable
Figure 4. VPEAK and VGAIN Settings vs. Cable Length
30
2
VPEAK = 1V
20
1
0
–1
0
–10
MAGNITUDE (dB)
MAGNITUDE (dB)
10
VPEAK = 0.5V
–20
VPEAK = 0V
–30
–40
–2
–3
–4
–5
–6
–7
–50
05699-014
–8
–60
–70
0.1
1
10
100
1k
–9
–10
0.1
3k
VPEAK AND VGAIN SETTINGS ARE CONSISTENT
WITH OPTIMIZED SETTINGS IN FIGURE 4
VOUT = 2V p-p
RL = 150Ω
1
Figure 5. Frequency Response for Various VPEAK Settings Without Cable
10
VGAIN = 1V
10
100
300
FREQUENCY (MHz)
FREQUENCY (MHz)
Figure 8. Equalized Frequency Response for 100 M Cable
1.5
VGAIN = 0.5V
0
1.0
–10
VGAIN = 0V
VPEAK AND VGAIN SETTINGS ARE
CONSISTENT WITH OPTIMIZED
SETTINGS IN FIGURE 4
0.5
–20
OUTPUT (V)
MAGNITUDE (dB)
300
100
10
1
CABLE LENGTH (M)
05699-011
0
–3
–7
VGAIN
0.2
–2
05699-012
0.7
MAGNITUDE (dB)
–1
05699-003
OPTIMIZED VPEAK AND VGAIN (V)
2
VOUT = 2V p-p
RL = 150Ω
–30
–40
0
–0.5
–50
1
10
100
1k
3k
FREQUENCY (MHz)
–1.0
–1.5
05699-010
–70
0.1
05699-013
–60
0
20
40
60
80
100
120
140
160
180
TIME (ns)
Figure 6. Frequency Response for Various VGAIN Settings Without Cable
Rev. A | Page 6 of 12
Figure 9. Equalized Pulse Response for 50 M of Cable
200
AD8128
1.0
VPEAK AND VGAIN SETTINGS ARE
CONSISTENT WITH OPTIMIZED
SETTINGS IN FIGURE 4
OUTPUT (V)
0.5
0
–0.5
–1.5
05699-009
–1.0
0
20
40
60
80
100
120
140
160
180
200
1.8
1.6
1.4
1.2
1.0
0.8
0.6
VGAIN SETTINGS ARE CONSISTENT
WITH OPTIMIZED SETTINGS IN FIGURE 4
0.4
0.2
0
05699-006
1.5
INTEGRATED VOLTAGE NOISE FROM 100kHz TO
1GHz (mV)
Data Sheet
0
0.1
0.2
0.3
TIME (ns)
0.4
0.5
0.6
0.7
0.8
0.9
1.0
450
500
VPEAK (V)
Figure 10. Equalized Pulse Response for 100 M of Cable
Figure 13. Integrated Voltage Noise vs. VPEAK
40
6
VPEAK = 0V
VGAIN = 0V
30
4
2
10
VOLTAGE (V)
0
–10
0
–2
OUTPUT
–20
–4
–40
–4
05699-008
–30
–3
–2
–1
0
1
2
3
–6
4
INPUT
0
50
100
150
VIN, CM (V)
200
250
05699-005
VOUT (mV)
20
300
350
400
TIME (ns)
Figure 11. Output Voltage vs. Common-Mode Input Voltage
Figure 14. Overdrive Recovery Time
20
100
10
10
0.1
05699-007
VPEAK = 0V
VGAIN = 0V
1
10
100
1k
0
–10
–20
VGAIN = 1V
VPEAK = 1V
–30
–40
VGAIN = 0V
VPEAK = 0V
–50
–60
05699-004
COMMON-MODE REJECTION (dB)
VOLTAGE NOISE (nV/ Hz)
VPEAK = 0.9V
VGAIN = 0.225V
–70
–80
0.1
1
10
100
FREQUENCY (MHz)
FREQUENCY (MHz)
Figure 12. Voltage Noise vs. Frequency
Figure 15. Common-Mode Rejection vs. Frequency
Rev. A | Page 7 of 12
1k
AD8128
10
POWER SUPPLY REJECTION (dB)
0
Data Sheet
VOS = 0V
VPEAK = 0V
VGAIN = 0V
+PSR
–10
–20
–PSR
–30
–40
–50
–70
0.001
05699-015
–60
0.01
0.1
1
10
1k
100
FREQUENCY (MHz)
Figure 16. Power Supply Rejection vs. Frequency
TEST CIRCUIT
VS+
1µF
VS+
0.01µF
10µF
AD8128
VS+
+
VS–
10µF
+
HPF
VIN+
CAT-5
50Ω
VOUT
HPF
50Ω
VIN–
VS–
VS–
VPEAK
LPF
VGAIN
VOFFSET
VGAIN
VOFFSET
0.01µF
0.01µF
0.01µF
Figure 17.
Rev. A | Page 8 of 12
0.01µF
05699-021
1µF
VPEAK
Data Sheet
AD8128
THEORY OF OPERATION
The AD8128 is a high speed, low noise analog line equalizer
that compensates for losses in CAT-5/CAT-5e cables up to
100 meters with ±1 dB flatness in the pass band out to 70 MHz
(see Figure 8). Two continuously adjustable control voltages
alter the frequency response to add flexibility to the system by
allowing for the compensation of various cable lengths as well
as for variations in the cable itself. The dc control voltage pin
VGAIN adjusts ac broadband gain from 0 dB to 3 dB (see Figure 6) to
account for dc resistive losses present in the cable. A second dc
control voltage pin VPEAK adjusts the amount of high frequency
peaking (see Figure 5) from 0 dB to 20 dB. This compensates
for the high frequency loss due to the skin effect of the cable.
The AD8128 has a high impedance differential input that allows
it to receive dc-coupled signals directly from the cable. For
systems with very high CMRR specifications, the AD8128 can
also be used with a dedicated receiver, such as the AD8130 or
AD8143, placed in front of it. The output of the AD8128 is low
impedance and is capable of driving a 150 Ω load resistor and
up to 20 pF of load capacitance at the output. For systems with
high parasitic capacitances at the output, it is recommended
that a small series resistor be placed between the output and
capacitive load to reduce ringing in the pulse response.
The AD8128 is designed to be used in medium-length systems
that have stringent low noise requirements as well as longerlength systems that can tolerate more noise. For the mediumlength requirements, a single AD8128 is able to compensate up
to 100 meters of cable with only 1.5 mV rms of output noise.
For longer-length applications that require equalization of up to
200 meters of cable, two AD8128 devices can be cascaded together
to achieve the desired equalization, while keeping approximately
the same pass-band bandwidth, but with a slight degradation
in settling time and slew rate.
The AD8128 approximates the magnitude response of
Equation 1 by summing multiple zero-poles pairs offset at
different frequencies. Equalization adjustment due to varying
line lengths is done by changing the weighting factors of each of
the zero-pole pairs.
INPUT COMMON-MODE VOLTAGE RANGE
CONSIDERATIONS
When using the AD8128 as a receiver, it is important to ensure
that the input common-mode (CM) voltage range of the AD8128
stays within the specified range. The input CM level can be easily
calculated by adding the CM level of the driver, the amplitude
of any sync pulses, and the other possible induced common-mode
signals from power lines and fluorescent lights.
VICM = VCM + VSYNC + VOTHER
For example, when using a single 5 V supply on the drive side,
the CM voltage of the line typically becomes the midsupply voltage,
VCM = 2.5 V. Furthermore, an addition of a sync signal, VSYNC =
0.5 V, on to the common mode puts the peak CM voltage at 3 V.
Assuming that both the driver and receiver have exactly the same
ground potential, the signal is marginally below the upper end
of the common-mode input range of 3.1 V. Other CM signals
that can be picked up by the CAT-5 cable result in exceeding the
CM input range of the AD8128.
The most effective way of not exceeding the CM level of the
AD8128 is to lower the CM level on the driver. In the previous
example, this was the primary contributor to the CM input level.
If this is not possible, a dedicated receiver with a wider CM input
range, such as the AD8130 or AD8143, must be used.
The frequency response of the AD8128 approximates the
inverse frequency response of a lossy transmission line, which
is given by
H f e kl 1 j
f
(2)
(1)
where:
f is the frequency.
l is the length.
k is the line constant.
Rev. A | Page 9 of 12
AD8128
Data Sheet
APPLICATIONS INFORMATION
KVM APPLICATIONS
In KVM applications, cable equalization typically occurs at the
root of the KVM network. In a star configuration, a driver is
located at each of the end nodes and a receiver/equalizer is
located at the single root node. In a daisy-chain configuration,
each of the end nodes are connected to one another, and one of
them is connected to the root. Similarly, the drivers are placed
on the nodes, and the receivers/equalizers are placed at the root.
In both of these aforementioned configurations, three AD8128
receiver/equalizers can be used at the root node to equalize the
transmitted red (R), green (G), and blue (B) channels for up to
100 meters of cable. Since the skew between two pairs of cables
in CAT-5 is less than 1%, the control pins can be tied together
and used as a single set of controls.
While these equations give a close approximation of the desired
value for each pin, to achieve optimal performance, it can be
necessary to adjust these values slightly.
Figure 19 and Figure 20 illustrate circuits that adjusts the
control pins on the AD8128. In Figure 19, a 1 kΩ potentiometer
adjusts the control pin voltage between the specified range of 0 V to
1 V. In Figure 20, a 2 kΩ potentiometer controls the offset pin from
−2.5 V to +2.5 V. For both of these configurations, a ±5V supply
is assumed.
+5V
4kΩ
Figure 19. Circuit to Control VGAIN and VPEAK (0 V to 1 V)
+5V
1kΩ
AD8128
1kΩ
VIN+
50Ω
VCM
CAT-5
50Ω
VCM
–5V
VOUT
HPF
VIN–
VPEAK VGAIN
VOFFSET
05699-016
LPF
VDIFF
Figure 18. Single Receiver Configuration for CAT-5 Equalizer
DC CONTROL PINS
The AD8128 uses two control pins (VGAIN and VPEAK) to adjust
the equalization based on the length of the cable and one pin
(VOFFSET) to adjust the dc output offset. VGAIN is a user-adjustable
0 V to 1 V broadband gain control pin, and VPEAK is a 0 V to 1 V
adjustable high frequency gain pin to equalize for the skin effect
in CAT-5 cable. The values of both VPEAK and VGAIN are linearly
correlated to the length of the cable to be equalized. A simple
formula can approximate the desired values for both of these pins.
VGAIN
length(m)
425m/V
(3)
VPEAK
length(m)
110m/V
(4)
Rev. A | Page 10 of 12
OFFSET
0.01µF
05699-018
2kΩ
HPF
VCM
05699-017
0.01µF
If the common-mode levels of the inputs permit using the
AD8128 as a receiver (see the Input Common-Mode Voltage
Range Considerations section), the input signal must be
terminated by a 100 Ω shunt resistor between the pairs, or by
two 50 Ω shunt resistors with a common-mode tap in the middle.
This CM tap can extract the sync information from the signal if
sync-on-common-mode is used.
VDIFF
CONTROL PIN
VGAIN OR VPEAK
1kΩ
Figure 20. Circuit to Control VOFFSET (±2.5 V)
Data Sheet
AD8128
VS+
1µF
VS+
0.01µF
1µF
AD8128
VS+
VS+
0.01µF
+
AD8128
VS+
VS–
+
HPF
HPF
VIN+
VIN+
VOUT
HPF
VIN–
VOUT
HPF
VIN–
LPF
VGAIN
VS–
VOFFSET
VPEAK
LPF
VGAIN
VS–
VOFFSET
VPEAK
VS–
VS–
0.01µF
1µF
VOFFSET VGAIN
0.01µF
05699-019
1µF
VPEAK
Figure 21. Cascaded AD8128 Configuration
CASCADED APPLICATIONS
To equalize distances longer than the specified 100 meters, the
AD8128 can be cascaded to provide equalization for longer
distances. When combining two AD8128 devices in series, it is
possible to link the control pins together and use them like a single
control pin for up to 200 meters of equalization.
In this configuration, it is important to note that some key
video specifications can be slightly degraded. By combining two
equalizers in series, specifications such as rise time and settling
time both increase while 3 dB bandwidth decreases slightly.
Also, integrated noise is increased because the second equalizer
adds gain. Subjective testing must be done to determine the
appropriate setting for the three control pins for optimum
equalization.
EXPOSED PAD (EP)
The 8-lead LFCSP has an exposed pad on the underside of the
body. To achieve the specified thermal resistance, it must have a
good thermal connection to one of the PCB planes. The
exposed pad must be soldered to a pad on top of the board
connected to an inner plane with several thermal vias. For the
AD8128, this pad must also be electrically connected to ground
to provide a ground reference to the device.
LAYOUT AND POWER SUPPLY DECOUPLING
CONSIDERATIONS
Standard high speed PCB layout practices must be adhered
to when designing with the AD8128. A solid ground plane is
recommended and good wideband power supply decoupling
networks must be placed as close as possible to the supply pins and
control pins. Small surface-mount ceramic capacitors are
recommended for these networks, and tantalum capacitors are
recommended for bulk supply decoupling.
EVALUATION BOARDS
There are two evaluation boards available for easy characterization
of the AD8128. A general-purpose evaluation board consisting of a
single AD8128, with an option of also using a dedicated receiver, is
available for simple characterization of the device. Additionally,
a KVM application specific evaluation board is available. This
evaluation board consists of six AD8128 devices to equalize
each of the RGB channels up to 200 meters, a 16-pin 26C32
comparator for sync-on-common-mode extract and a triple op
amp to provide additional gain if necessary.
Rev. A | Page 11 of 12
AD8128
Data Sheet
OUTLINE DIMENSIONS
2.54
2.44
2.34
3.10
3.00 SQ
2.90
0.50 BSC
8
PIN 1 INDEX
AREA
1.70
1.60
1.50
EXPOSED
PAD
0.50
0.40
0.30
4
TOP VIEW
PKG-004371
0.80
0.75
0.70
SEATING
PLANE
0.05 MAX
0.02 NOM
0.30
0.25
0.20
1
BOTTOM VIEW
0.20 MIN
PIN 1
INDICATOR
(R 0.20)
FOR PROPER CONNECTION OF
THE EXPOSED PAD, REFER TO
THE PIN CONFIGURATION AND
FUNCTION DESCRIPTIONS
SECTION OF THIS DATA SHEET.
0.203 REF
12-03-2013-A
5
Figure 22. 8-Lead Lead Frame Chip Scale Package [LFCSP]
3 mm × 3 mm Body and 0.75 mm Package Height
(CP-8-21)
Dimensions shown in millimeters
ORDERING GUIDE
Model1
AD8128ACPZ-R2
AD8128ACPZ-RL
AD8128ACPZ-R7
1
Temperature Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Package Description
8-Lead Lead Frame Chip Scale Package [LFCSP]
8-Lead Lead Frame Chip Scale Package [LFCSP]
8-Lead Lead Frame Chip Scale Package [LFCSP]
Z = RoHS Compliant Part.
© 2005–2016 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D05699-0-6/16(A)
Rev. A | Page 12 of 12
Package Option
CP-8-21
CP-8-21
CP-8-21
Branding
HZB
HZB
HZB
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