SIW1721B

SiW1721B 0 Features • Integrated RF transceiver and modem for Bluetooth wireless technology. • Manufactured using low-power 0.18-micron CMOS process technology. • Digital baseband interface connects directly to an integrated Bluetooth controller. • Direct conversion RF architecture improves receiver-blocking performance. • Low out-of-band spurious emissions minimize interference with mobile phone operations. • Hardware AGC dynamically adjusts receiver performance in changing environments. • 50 Ω RF I/O does not need additional external impedance matching components. • On-chip voltage regulation simplifies system design. • -88 dBm receiver sensitivity and +2 dBm transmitter power typical performance specifications. • Bluetooth Specification V2.0 qualified. Complies with Bluetooth specifications V1.1, V1.2 and V2.0. Reference Clock Ext Power SiW1721B Radio Modem Single-ended LNA ADC and Downconverter Single-ended Driver DAC and Upconverter GFSK Demodulator GFSK Modulator Radio Programming and Control SPI CLK Circuit Analog Regulator Digital Regulator Mobile Phone Chip Set BLUETOOTH® RADIO MODEM Modem I/F & Data Reference PLL Modem Clock Generator Integrated Bluetooth Baseband Bluetooth Subsystem Using the SiW1721B Radio Modem Summary The SiW1721B is a 2.4-GHz radio transceiver for Bluetooth wireless technology. This highly integrated transceiver is specifically designed for use with a third party Bluetooth baseband controller chipset requiring an external Bluetooth RF transceiver. Due to its low power CMOS process, the design minimizes current draw in both active and standby modes. The SiW1721B combines a radio transceiver and Gaussian Frequency Shift Keying (GFSK) modem with digital control and interface logic. The IC also incorporates analog and digital voltage regulators and a reference Phase Lock Loop (PLL) capable of accepting various reference clock frequencies. The level of integration enables a low system cost with fewer external components. The SiW1721B is packaged in a 5-by-5-mm, Pb-free, 32-pin QFN package that meets RoHS (Green) requirements. Operating temperature range is guaranteed from -40°C to +85°C. Applications • Mobile phones with integrated controller for Bluetooth wireless technology. Ordering Information SiW1721B Bluetooth® Radio Modem See page 12 for details. Optimum Technology Matching® Applied Si BJT Si Bi-CMOS GaInP/HBT GaAs HBT SiGe HBT GaN HEMT GaAs MESFET Si CMOS SiGe Bi-CMOS RF Micro Devices, Inc. 7628 Thorndike Road Greensboro, NC 27409, USA Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com 60 0076 R00F SiW1721B Radio Modem IC DS October 6, 2006 1 of 12 SiW1721B Description The following figure shows the SiW1721B Radio Modem functional block diagram. During the receive process, the radio signal is taken from the single-ended RF input pin that feeds into the low noise amplifier (LNA). The signal from the LNA is directly down-converted to I/Q baseband, filtered with an anti-aliasing filter, and converted to a digital signal with a high resolution analog-to-digital converter. The critical channel filtering is done in the digital domain for stable and repeatable performance. The signal is then processed by a high performance GFSK demodulator. The IC has multiple internal selfcalibration circuits to maintain stable and repeatable performance from part-to-part as well as over the full temperature range. The IC has two fully integrated regulators: one for the radio (analog regulator) and one for the digital logic (digital regulator). The digital regulator can be used to supply a Bluetooth baseband controller. Both regulators can be bypassed if external regulation is desired. Note: When bypassing the analog regulator, the VBATT_ANA and VCC_OUT pins must be tied together and the external analog voltage (1.8 V) should be applied to the VBATT_ANA pin. When bypassing the digital regulator, the VBATT_DIG pin should be left unconnected and the external digital voltage (1.8 V) should be applied to the VBB_OUT pin. The IC also provides power on reset and glitch-free clock start-up. A reference PLL can be enabled to support a number of different reference frequencies. Digital control functions and a programming interface provide radio modem control and a flexible interface to external Bluetooth link controllers. XTAL_P/CLK VBATT_ANA CHG_PUMP VBATT_DIG VCC_OUT VBB_OUT RESET_N BB_CLK VTUNE PLL Control Clock Distribution LNA Voltage Regulators and Power Distribution ADC 0 90 Internal 50-Ohm Match Network ADC PLL Synthesizer Power Control 0 90 DAC GFSK Modem RF_IO IDAC VDD_IO RX_TX_DATA CD_TXEN ENABLE_RM HOP_STROBE TX_RX_SWITCH TX_BIAS SPI_SS SPI_TXD SPI_RXD SPI_CLK Serial Programming Interface (SPI) DAC Register File System Control SiW1721B Block Diagram Radio Interface An internal power control loop maintains a very stable RF_IO signal level over the full temperature range and from part to part. This means predictable and repeatable range at any temperature. Modem Interface The modem interface transfers the Bluetooth data between the SiW1721B Radio Modem and the ASIC. For reference purposes, the pin description table (Table 1) provides a brief description of typical interface modes. Clock Signals Multiple reference clock frequencies can be used as a reference for the RF circuits, to synthesize clocks for most of the internal digital circuits, and to supply external processors with timing signals. Serial Programming Interface (SPI) The serial programming interface (SPI) is used to access the internal registers of the SiW1721B Radio Modem. The SPI is a synchronous serial interface that can be clocked to a nominal speed of 8MHz. Power The SiW1721B Radio Modem includes both analog and digital voltage regulators. Input options are based on factors such as voltage source, where internal regulators are used, and I/O voltage. 2 of 12 60 0076 R00F SiW1721B Radio Modem IC DS VCC SiW1721B Pin Description The SiW1721B Radio Modem’s radio and modem interface (SPI), a single clock input, and supply voltage are required for proper operation. Name RF_IO IDAC Pad Type Analog Analog Description Combined 50 Ω input and output pin in normal mode. Rx only in power class 1 mode. Power control to external power amplifier. This output provides a variable current source that can be used to control the external power amp. Leave unconnected if not used. Output signal to indicate the current state of the radio. The polarity is programmable with the default set as: Low=Transmit mode. High=Non-transmit mode. Bias for the output driver in normal mode, transmit output in power class 1 mode. Radio Interface Signal Description TX_RX_SWITCH TX_BIAS CMOS output Analog CMOS bi-directional CMOS bi-directional Modem Interface Description RX_TX_DATA Received sliced-mode data from radio; or transmit data to radio. Dual function carrier detect and transmit enable. This bi-directional signal can be enabled through internal registers. During transmit, this pin can be used as an INPUT to indicate valid transmit data (TXEN). During receive, this pin can be used as an OUTPUT to indicate carrier detect (CD). Input only, output, or bi-directional. Sleep/wake control signal from baseband controller. Used to command the SiW1721B Radio Modem from idle to sleep mode, and to awaken the SiW1721B Radio Modem from sleep mode. Signal generated by the baseband to indicate the start of TX or RX ramp-up. Reset for digital circuits only. State machines and internal registers reset to their default state. This signal is an asynchronous input with a minimum pulse width requirement of 10 µs. System clock crystal positive input or reference clock input. For additional information see the “Crystal Requirements” and “External Reference Requirements” sections. System clock crystal negative input. If a reference clock frequency is used, this pin should be left unconnected. Selectable clock output to external baseband controller. Five frequencies are supported (in MHz): reference frequency, reference frequency/2, 12, 13, 16, 32, 48, and 52. BB_CLK stops oscillating when ENABLE_RM is de-asserted (low). SPI data output from SiW1721B. SPI data input to SiW1721B. Clock input used for synchronous data transfer on the SPI bus. SPI slave select that enables the SiW1721B Radio Modem as the target. Supply voltage to internal analog voltage regulator. Supply voltage to internal digital voltage regulator. Regulated output from internal analog regulator. Regulated output from internal digital regulator. Supply voltage to on-chip analog circuits. Supply voltage to on-chip I/O interface. I/O pins: BB_CLK, CD_TXEN, ENABLE_RM, HOP_STROBE, RESET_N, RX_TX_DATA, SPI_CLK, SPI_RXD, SPI_SS, SPI_TXD, TX_RX_SWITCH. This signal is used to indicate that the internal digital regulator is stable (VBB_OUT). Decoupling capacitor for voltage reference for the internal A/D converter. Decoupling capacitor for voltage reference for the internal A/D converter. Pin for reference PLL loop filter. Pin for RF PLL loop filter. CD_TXEN ENABLE_RM HOP_STROBE RESET_N CMOS input CMOS input CMOS input Clock Signals Description XTAL_P/CLK XTAL_N BB_CLK Analog Analog CMOS output Serial Programming Interface Description SPI_TXD SPI_RXD SPI_CLK SPI_SS VBATT_ANA VBATT_DIG VCC_OUT VBB_OUT VCC VDD_IO VBB_RDY VREFP_CAP VREFN_CAP VTUNE CHG_PUMP CMOS output CMOS input CMOS input CMOS input Power Power Power Power Power Power CMOS output Analog Analog Analog Analog Power Signals Description Other I/O Description Table 1. SiW1721B Radio Modem Pin List 60 0076 R00F SiW1721B Radio Modem IC DS 3 of 12 SiW1721B System Specifications Absolute Maximum Ratings Parameter VCC VDD_IO VBATT_ANA VBATT_DIG TST RFMAX Analog circuit supply voltage I/O supply voltage Analog regulator supply voltage Digital regulator supply voltage Storage temperature Maximum RF input level Description Min -0.3 -0.3 -0.3 -0.3 -55 – Max 3.63 3.63 3.63 3.63 +125 +5 Unit V V V V °C dBm Note: Absolute maximum ratings indicate limits beyond which the useful life of the device may be impaired or damage may occur. Recommended Operating Conditions Parameter TOP VBATT_ANA VBATT_DIG VCC VDD_IO Description Operating temperature (industrial grade) Supply for internal analog voltage regulator Supply for internal digital voltage regulator Analog supply voltage Digital interface I/O supply voltage Min -40 2.3 2.3 1.71 1.62 Max +85 3.63 3.63 1.89 3.63 Unit °C V V V V ESD Rating Symbol ESD 1 Description ESD protection - all pins 1 Rating 2000 V This device is a high performance RF integrated circuit with an ESD rating of 2,000 volts (HBM conditions per Mil-Std-883, Method 3015). Handling and assembly of this device should only be done using appropriate ESD controlled processes. Electrical Characteristics DC Specification (TOP =+25°C, VDD_IO =3.0V) Symbol VIL VIH VOL VOH IOH IOL IILI Input low voltage Input high voltage Output low voltage Output high voltage Output high current Output high current (pins 16, 19) Output low current Output low current (pins 16, 19) Input leakage current Description Min. GND-0.1 0.7*VDD_IO GND 0.8*VDD_IO – – – – – Typ. – – – – 500 4 500 4