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Features
• • • • • •
AMPS/Cell Band and PCS Band CDMA/GPS Operation Low-current Consumption Excellent Noise and IP3 Performance Adjustable Third Order intercept on LNA Stage Flexible IF Frequency Range from 80 MHz to 230 MHz Divide by 2 Prescaler
Benefits
• Very Small 32-pin 5 mm x 5 mm Package • Few External Components • Fully ESD Protected
Applications
• Quad-mode/Tri-band CDMA IS-95/98-based Mobile Phones with GPS Support Electrostatic sensitive device. Observe precautions for handling.
2.8 V Tri-band/ Quad-mode RF Receiver for CDMA/AMPS/ GPS T0353 Preliminary (Summary)
Description
The T0353 is a CDMA front-end receiver RFIC designed for Tri-band, quad-mode operation. The device supports AMPS, Cell CDMA, PCS CDMA, and A-GPS operation. The IF range is from 80 MHz to 230 MHz with external tuning. The low-noise amplifiers have an adjustable third order intercept point (IP3) to minimize inter-modulation and cross-modulation effects. The mixers are designed for differential IF outputs (single-ended or differential IF outputs for AMPS and GPS modes), and they feature excellent linearity and low-noise figure. The T0353 also integrates a divide-by-2 frequency divider to allow the use of only one VCO module for both CDMA bands. However, it also has the option of connecting the LO directly to the cellular mixer LO input. This device is available in a 5 mm x 5 mm MLF package with 32 pins. The T0353 front-end receiver is capable of meeting all electrical requirements in accordance with the TIA/EIA 98-C wireless communication standard.
Rev. 4559AS–CDMA–10/02
1
Figure 1. Block Diagram
GPS_LNA OUT
GPS_Mix IN
PLNA OUT
10 GPS_LNA_IN Vcc LNA Iset_PCS PLNA_IN PLNA_GND GLO_IN 8 3 32 2 1 12
31 27
PM_In
16
Mix Vcc 22 19 18
GPS_MIX_Out+ GPS_MIX_Out-
24 23
CDMA_Out+ CDMA_Out-
P_CLO_IN
11
15
PCS LO Out
Vcc LO TX LO/2 L_IN Band_SEL Gain BUFFEN Vcc_Dig CLNA_IN
17 13 30 29 4 25 28 7 9 Iset_Cell Control
/2
14
Cell LO Out
21 20
AMPS IF+ AMPS IF-
6 CLNA GND
5 CLNA OUT CM IN
26
2
T0353
4559AS–CDMA–10/02
T0353
Pin Configuration
Figure 2. Pinning
PLNA_GND PLNA_IN VCC_LNA Gain CLNA_OUT CLNA_GND CLNA_IN GPS_LNA_IN
1 2 3 4 5 6 7 8
32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 9 10 11 12 13 14 15 16 Iset_Cell GPS_LNA_OUT P_CLO_IN GLO_IN LO/2 PLO_OUT CLO_OUT GPSMix_IN
Isset_PCS PLNA_OUT LIN Band_SEL VCC_DIG PM_IN CM_IN BUFFEN CDMA_OUT+ CDMA_OUTVCC_MIX AMPS_OUT+ AMPS_OUTGPSMix_OUT+ GPSMix_OUTVCC_LO_TX
Pin Description
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Symbol PLNA_GND PLNA_IN Vcc_LNA Gain CLNA_OUT CLNA_GND CLNA_IN GPS_LNA_IN Iset_CELL GPS_LNA_OUT P_CLO_IN GLO_IN LO / 2 PLO_OUT Function PCS LNA emitter-ground. The LNA emitter ground should be grounded immediately to the groundplane to reduce stray inductance and capacitance that may affect performance. PCS LNA input. Requires a DC blocking capacitor and an L-C (shunt C/series L) matching network for optimum gain, intercept and noise performance. Power supply pin for PCS and Cell LNAs. Bypass with a capacitor as close to the pin as possible. Gain select logic input for cellular band. Logic high selects High Gain. Cell LNA output. Requires a pull-up inductor to VCC and a series DC blocking capacitor, which can be used as part of the output matching network. Cell LNA emitter-ground. The LNA emitter ground should be grounded immediately to the groundplane to reduce stray inductance and capacitance that may affect performance. Cell LNA input. Requires a DC blocking capacitor and an L-C (shunt C/series L) matching network for optimum gain, intercept and noise performance. GPS LNA input. Requires a DC blocking capacitor and an L-C (shunt C/series L) matching network for optimum gain, intercept and noise performance. Bias resistor for Cell LNA. For typical bias use a 390 W resistor to ground which sets the bias current for HGHL mode. GPS LNA output. PCS and Cell band LO input. GPS LO input. LO divider-select input. Low disables divider. High selects divider in cellular and AMPS modes. PCS LO buffer output. Internally matched to 100 W. Does not require a blocking capacitor.
3
4559AS–CDMA–10/02
Pin Description (Continued)
Pin 15 16 Symbol CLO_OUT GPSMix_IN Vcc_LO_Tx GPSMix_OUTGPSMix_OUT+ AMPS_OUTAMPS_OUT+ Vcc_Mix CDMA_OUTCDMA_OUT+ BUFFEN CM_IN PM_IN Vcc_DIG Band_SEL LIN PLNA_OUT Iset_PCS Paddle Function Cellular LO buffer output. Internally matched to 100 W. Does not require a blocking capacitor. GPS mixer input. Supply voltage for LO buffers. Negative GPS IF output. Positive GPS IF output. Negative AMPS IF output. Positive AMPS IF output. Supply voltage for all mixers. Negative CDMA IF output. Positive CDMA IF output. LO output buffer enable. Set BUFFEN pin HIGH to power up the LO buffer output corresponding to the selected band. Cell RF input to Cell CDMA mixer and Cell AMPS mixer. PCS mixer RF input. Supply voltage for logic control circuits. Logic input for band select. Logic LOW selects PCS or GPS. Logic HIGH selects cellular (AMPS). L.