RF250 Rx ASIC for CDMA, AMPS, and PCS Applications The RF250 Application-Specific Integrated Circuit (ASIC) is a triple-mode, dual-band receiver (Rx) intended for use in Code Division Multiple Access (CDMA) portable phones in both cellular and Personal Communications System (PCS) bands. As a dual mode IC, it can be used in CDMA mode or Advanced Mobile Phone System (AMPS) mode. Features • Supports CDMA/AMPS/PCS1900 modes. Three battery cell operation (2.7 V < VCC < 3.6 V). Higher level of integration. I/Q outputs. On-chip 100 to 640 MHz oscillators. Low power operation: <60 mA. 48-pin Thin Quad Flat Pack (TQFP) package with downset paddle. • • • • • • The device incorporates all the components required to implement the receiver front end and the In-Phase and Quadrature (I/Q) demodulator stages except for the filter blocks and PCS Low Noise Amplifier (LNA). Besides a cellular band LNA, there are separate mixers for AMPS, CDMA 800 MHz, and PCS bands. The AMPS mixer output is single-ended, followed by the AMPS Intermediate Frequency (IF) Surface Acoustic Wave (SAW) filter. The cellular and PCS mixers have balanced outputs for the CDMA IF SAW filters. The mixers are followed by an IF Variable Gain Amplifier (VGA) and an I/Q demodulator. Applications • • The outputs from the filters are combined through separate buffers at the input of the VGA. The buffers are enabled depending on the selected mode. The VGA has a gain control range greater than 90 dB. There are two VHF oscillators that operate with external tank circuits. They provide signals to the Local Oscillator (LO) for the I/Q demodulator in the cellular and PCS bands. Tri-mode handsets. CDMA and AMPS modes in the cellular band: - AMPS - CDMA-US - CDMA-J CDMA mode in the PCS band: - US-PCS • PCS_MIX_BYPASS PCS_LO CELL_LO PCS_MIX_IN VCC4 CELL_MIX_IN CELL_IFTRAP CELL_MIX_GND NC PCS_BIAS_SET CELL_LNA_OUT The noise figure, gain, and third order Input Intercept Point (IIP3) of each stage in the receiver chip are optimized to meet the system requirements for AMPS and CDMA modes as per TIA/EIA-98-B and ANSI JSTD-018 (PCS). Employing silicon bipolar technology, the ASIC is designed for high performance and a high level of integration. GND - K-PCS 32 CDMA_IF_OUT- CELL_BIAS_SET 6 31 CELL_MIX_BYPASS CELL/PCS 7 30 VGA_PCS_IN+ FM/CDMA 8 29 VGA_PCS_IN- VCC2 9 28 VGA_AMPS_IN GND 10 27 VGA_CDMA_IN+ CELL_TANK- 11 26 VGA_CDMA_IN- CELL_TANK+ 25 12 13 14 15 16 17 18 19 20 21 22 23 24 VGA_CONTROL 5 SLEEP CDMA_IF_OUT+ VCC1 Q- 33 Q+ AMPS_IF_OUT 4 I+ 34 I- PCS_IF_OUT- 3 GND 35 PLL- 2 PLL+ The device package and pinout are shown in Figure 1. A CELL_LNA_DECOUPLE NC block diagram of the RF250 is shown in Figure 2. CELL_LNA_IN DIV2/DIV4 48 47 46 45 44 43 42 41 40 39 38 37 36 PCS_TANK- 1 PCS_TANK+ GND PCS_IF_OUT+ VCC3 C452 Figure 1. RF250 Rx ASIC Pinout – 48-Pin TQFP Package With Downset Paddle Data Sheet Conexant Systems, Inc. Doc. No. 101251A August 24, 2000 Rx ASIC RF250 AMPS IF SAW RF SAW(CELL) CDMA IF SAW FM/CDMA 42 48 CELL_LNA_IN 34 8 2 2 26, 27 11,12 2 32, 33 28 19 4 I 20 CELL/PCS 7 ÷ 2,4 RF250 Rx ASIC 23 21 SLEEP Q 22 PCS_LNA_IN RF SAW (PCS) IF SAW (PCS) 39 38 24 13,14 16,17 2 VGA_CONTROL 2 2 CELL_LO 29,30 35,36 PCS_LO 40 PLL C262 Figure 2. RF250 Rx ASIC Block Diagram Technical Description Low Noise Amplifier (LNA). The cellular band LNA is designed with a low noise figure and high linearity to achieve maximum receiver dynamic range. Pin 2, the 800 LNA decouple pin, is required to be grounded through an RF bypass capacitor with minimum trace length. The input and output match are external to the chip. Mixers. The RF250 Rx ASIC has three independent mixers, one for the PCS band and two for the cellular band (AMPS and CDMA). The mixers are designed to operate with very low LO powers of –10 dBm. The LO ports are matched internal to the chip. The cellular band mixers have a high gain and a low noise figure that allow them to meet the system noise figure. The cellular CDMA and PCS mixers have balanced output to drive the IF filters. The AMPS mixer has a single-ended output to match the standard IF SAW filters. Variable Gain Amplifier (VGA). The high dynamic range required by CDMA handsets is achieved by the VGA, which is common to all modes. The VGA 2 has a minimum dynamic range of 90 dB with a control voltage of 0.2 to 2.7 volts. The appropriate signal path is switched internal to the device. This eliminates off-chip switching needed to operate this common VGA in cellular AMPS, CDMA, and PCS modes. I/Q Demodulator. The local oscillator signals are generated on-chip. The I/Q demodulator is internally connected to the VGA output. It is designed to have a very low amplitude and phase imbalance. The I and Q outputs are differential. The DC offsets between the differential outputs and between I and Q channels are designed to be extremely low to facilitate compatibility with baseband Interfaces. VHF Oscillators. There are two on-chip oscillators, one for the cellular and one for the PCS bands. These Voltage Controlled Oscillators (VCOs) work with external tank circuits and varactor diodes. The outputs of the differential oscillators are buffered and the output is used to drive the prescaler of an external Phase Locked Loop (PLL). The VCOs typically operate at twice the IF frequency and can operate at up to four times the IF frequency. Conexant Systems, Inc. 101251A August 24, 2000 RF250 Rx ASIC The local oscillators for the I/Q demodulators are derived by an on-chip frequency divider. The logic signal to select the divider ratio (2 or 4) is available on Pin 15 (DIV2/DIV4). Mode Control. The operation of the chip is controlled by signals at Pin 7 (CELL/PCS), Pin 8 (FM/CDMA), Pin 23 (SLEEP), and the DIV2/DIV4 select commands at Pin 15. All the switching is done internally. The supply voltage should be present at all the VCC pins for normal operation. The internal switching needed to select each of these signals is shown in Table 1. Electrical and Mechanical Specifications. Included in this document are Tables 1 through 5 and Figures 1 through 29, which define the electrical and mechanical specifications of the RF250. Table 1: Mode Control Select Signal Switching Table 2: Pin Assignments and Functional Pin Descriptions Table 3: Absolute Maximum Ratings Table 4: Recommended Operating Conditions Table 5: Electrical Specifications Figure 1: Pinout Configuration Pin Figure 2: Functional Block Diagram Figures 3 - 27: Typical Functional Block Performances Figure 28: Package Dimensions Figure 29: Dimensions Tape and Reel ESD Sensitivity The RF250 is a Class 1 device. The following extreme Electrostatic Discharge (ESD) precautions are required according to the Human Body Model (HBM): • • • • Protective outer garments. Handle device in ESD safeguarded work area. Transport device in ESD shielded containers. Monitor and test all ESD protection equipment. The HBM ESD withstand threshold value, with respect to ground, is ±1.5 kV. The HBM ESD withstand threshold value, with respect to VDD (the positive power supply terminal) is also ±1.5 kV. AMPS CDMA PCS 7 (CELL/PCS) 0 0 1 8 (FM/CDMA) 0 1 x 15 (DIV2/DIV4) 0 0 0 23 (SLEEP) 1 1 1 Key: 0 = LOW 1 = HIGH x = N/A Table 1. Mode Control Select Signal Switching 101251A August 24, 2000 Conexant Systems, Inc. 3 Rx ASIC RF250 Table 2. RF250 Signal Description (1 of 2) Pin # 4 Name Description 1 GND Ground 2 CELL_LNA_DECOUPLE An RF bypass capacitor with very short trace should be connected to this pin. 3 NC No connection 4 CELL_LNA_IN The input to LNA needs external matching. The matching network should be placed as close to this pin as possible. High Q components are recommended to minimize the effect on the noise figure. 5 VCC1 Supply voltage to the RF bias. An RF bypass capacitor should be connected from the pin to ground with short traces.. 6 CELL_BIAS_SET This pin sets the cellular RF bias current. Typically, a 180 Ω resistor is connected from the pin to ground. 7 CELL/PCS Band select: 0 = cellular (800 MHz); 1 = PCS (1900 MHz). 8 FM/CDMA Cellular band mode select: 0 = AMPS; 1 = CDMA. 9 VCC2 Voltage supply pin to the VCO buffer. A bypass capacitor should be placed close to the device from pin 9 to pin 10. The trace should be short and connected immediately to the ground plane for best performance. 10 GND Ground return from the VCO buffer. 11 CELL_TANK– Differential tank connection for the cellular band VCO. Care should be taken during the layout of the external tank circuit to prevent parasitic oscillations. 12 CELL_TANK+ Differential tank connection for the cellular band VCO. Care should be taken during the layout of the external tank circuit to prevent parasitic oscillations. 13 PCS_TANK– Differential tank connection for the PCS band VCO. Care should be taken during the layout of the external tank circuit to prevent parasitic oscillations. 14 PCS_TANK+ Differential tank connection for the PCS band VCO. Care should be taken during the layout of the external tank circuit to prevent parasitic oscillations. 15 DIV2/DIV4 Selects the divide ratio of the VCO to the LO port of the I/Q demodulator: 0 = divide by 2, 1 = divide by 4. 16 PLL+ Differential buffered VCO output. 17 PLL– Differential buffered VCO output. 18 GND Ground 19 I– I channel differential output. 20 I+ I channel differential output. 21 Q+ Q channel differential output. 22 Q– Q channel differential output. 23 SLEEP Activates sleep mode: 0 = sleep; 1 = enable 24 VGA_CONTROL VGA voltage input. Input impedance is greater than 50K Ω. 25 VCC3 Voltage supply to VGA and I/Q demodulator stages. Supply should be well regulated and bypassed to prevent modulation of the signal by the supply ripple. 26 VGA_CDMA_IN– CDMA differential VGA input 27 VGA_CDMA_IN+ CDMA differential VGA input 28 VGA_AMPS_IN AMPS VGA input. Conexant Systems, Inc. 101251A August 24, 2000 RF250 Rx ASIC Table 2. RF250 Signal Description (2 of 2) Pin # Name Description 29 VGA_PCS_IN– PCS differential VGA input. 30 VGA_PCS_IN+ PCS differential VGA input. 31 CELL_MIX_BYPASS Low frequency bypass for the AMPS mixer. 32 CDMA_IF_OUT– CDMA differential mixer output. Requires an external inductor to VCC. Output impedance is set by an external match. 33 CDMA_IF_OUT+ CDMA differential mixer output. Requires an external inductor to VCC. Output impedance is set by an external match. 34 AMPS_IF_OUT AMPS mixer output. Requires an external inductor to VCC. Output impedance is set by an external match. 35 PCS_IF_OUT– PCS differential mixer output. Requires an external inductor to VCC. Output impedance is set by an external match. 36 PCS_IF_OUT+ PCS differential mixer output. Requires an external inductor to VCC. Output impedance is set by an external match. 37 PCS_MIX_BYPASS Low frequency bypass for the PCS mixer. 38 PCS_LO The local oscillator input for the PCS band. 39 CELL_LO The local oscillator input for the cellular band. 40 PCS_MIX_IN PCS mixer input. 41 VCC4 Voltage supply pin for the mixers. An RF bypass capacitor should be connected from this pin to ground. It should be connected as close to the device as possible with very short trace lengths. 42 CELL_MIX_IN Cellular mixer input. 43 CELL_IFTRAP The parallel LC circuit is tuned to the cellular IF frequency. 44 CELL_MIX_GND Add inductance from the pin to ground to lower mixer gain and increase IIP3. 45 NC No connection 46 PCS_BIAS_SET This pin sets the PCS RF bias current. Typically, a 180 Ω resistor is connected from the pin to ground. 47 GND Ground 48 CELL_LNA_OUT Cellular band LNA output. This is an open collector output. An inductor must be connected to VCC. The matching is done externally to the chip. 101251A August 24, 2000 Conexant Systems, Inc. 5 Rx ASIC RF250 Table 3. Absolute Maximum Ratings Minimum Maximum Units Supply voltage (VCC) Parameter –0.3 +5.5 V Input voltage range –0.3 VCC V LNA input power -- +5 dBm Power dissipation -- 600 mW Ambient operating temperature –30 +80 °C Storage temperature –40 +125 °C Table 4. Recommended Operating Conditions Min Typical Max Units Supply voltage (VCC) Parameter 2.7 3.3 3.6 V Operating temperature –30 +25 +80 Impedance of logic inputs 6 50 °C KΩ Logic 0 0.0 0.5 V Logic 1 VCC – 0.5 VCC V Conexant Systems, Inc. 101251A August 24, 2000 RF250 Rx ASIC Table 5. RF250 Rx ASIC Electrical Specifications (1 of 3) TA = 25°° C, VCC = 3.3 V, PLO = –10 dBm Parameter Symbol Test Condition Min Typical Max Units Cellular LNA Gain @ 881 MHz 13 dB Gain variation over band (869-894 MHz) 0.5 dB Gain variation over temperature 1.5 dB Noise figure @ 881 MHz 2.0 dB Reverse isolation 20 dB P1dB @ input –5 dBm IP3 @ input 8 dBm Input return loss (869-894 MHz) –12 Output return loss (869-894 MHz) dB –15 dB 12 mA Conversion gain (power): CDMA mode AMPS mode 14 11 dB dB Single-sideband noise figure: CDMA mode AMPS mode 7.5 8 dB dB P1dB @ input: CDMA mode AMPS mode –6 –9 dBm dBm IP3 @ input: CDMA mode AMPS mode 5 3 dBm dBm Total supply current (adjustable) Cellular Mixer Mixer RF input return loss, RF port 1 (869-894 MHz) –15 dB LO input power level –10 dBm IF output resistance: CDMA mode (differential) AMPS mode (single-ended) 3000 1000 Ω Ω IF frequency range 300 MHz LO/RF input isolation 20 dB Total supply current 18 mA 101251A August 24, 2000 Conexant Systems, Inc. 7 Rx ASIC RF250 Table 5. RF250 Rx ASIC Electrical Specifications (2 of 3) TA = 25°° C, VCC = 3.3 V, PLO = –10 dBm Parameter Symbol Test Condition Min Typical Max Units PCS Mixer Conversion gain (power) 10 dB Single-sideband noise figure 12 dB P1dB @ input –5 dBm IP3 @ input 5 RF input return loss (1930-1990 MHz) dBm –15 dB LO input power level –10 dBm IF output resistance (differential) 1000 Ω IF frequency range 300 LO/LNA input isolation 25 MHz dB LO/RF input isolation 20 dB Total supply current (adjustable) 24 mA Rx VGA - I/Q Demodulator Frequency range 50 Input impedance: CDMA input (differential) PCS input (differential) AMPS input (single-ended) 300 Ω Ω Ω 1000 1000 1000 Gain: Maximum Minimum Maximum (AMPS) Minimum (AMPS) 53 –47 61 –39 Gain slope 54 –42 62 –34 55 –37 63 –29 45 Gain slope linearity (over any 6 dB segment) –3 MHz dB dB dB dB dB/V +3 dB IF amplifier IIP3: @ Maximum gain (CDMA and PCS mode) @ maximum gain (AMPS mode) –50 –58 dBm Input 1 dB compression @ minimum gain –10 dBm IF amplifier noise figure: @ Maximum gain Minimum gain 5 50 dB dB 8 Conexant Systems, Inc. 101251A August 24, 2000 RF250 Rx ASIC Table 5. RF250 Rx ASIC Electrical Specifications (3 of 3) TA = 25°° C, VCC = 3.3 V, PLO = –10 dBm Parameter Symbol Test Condition Min Typical Max Units Rx VGA - I/Q Demodulator (continued) Output level: CDMA AMPS 2.75 5.5 Maximum output level mVrms mVrms 1.4 Gain variation over frequency: CDMA (1-630 kHz) AMPS (0.1-12.2 kHz) Output impedance (differential) Vp-p 0.1 0.1 0.3 0.3 dB dB 0.2 0.3 dB 4 deg 500 I+, I–, and Q+, Q– DC offset 6 I/Q gain mismatch I/Q phase mismatch 2 I to Q DC offset 30 Total supply current (includes I/Q mixers, LO buffers, and dividers) 15 mVrms mV mA Oscillator Frequency range 100 640 Phase noise (fc = 200 MHz, unloaded Q = 20) @ 100 kHz offset –117 Second harmonic distortion (application dependent) –30 MHz dBc/Hz –26 dBc Output level to PLL (differential) 300 mVp-p Output impedance to PLL (differential) 300 Ω Reverse isolation –30 Total supply current 101251A August 24, 2000 –40 5 Conexant Systems, Inc. dB mA 9 Rx ASIC RF250 3 16 14 Gain (dB) 10 8 -30 deg C 6 25 deg C 4 Noise Figure (dB) 2.5 12 80 deg C 2 1.5 -30 deg C 1 25 deg C 0.5 2 80 deg C 0 0 2.4 2.6 2.8 3 3.2 3.4 3.6 2.4 3.8 2.6 2.8 Vcc (V) 3.2 3.4 3.6 3.8 Vcc (V) Figure 3. LNA Gain Over Temperature at 881.52 MHz Figure 4. LNA Noise Figure at 881.52 MHz 12 14 10 12 10 8 Gain (dB) IIP3 (dBm) 3 6 -30 deg C 4 8 -30 deg C 6 25 deg C 4 25 deg C 2 80 deg C 2 80 deg C 0 0 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 Vcc (V) Vcc (V) Figure 5. LNA IIP3 at 881.52 MHz Figure 6. AMPS Mixer Gain 10 10 9 8 8 6 4 7 IIP3 (dBm) Noise Figure (dB) (RF Frequency = 881.52 MHz, LO Frequency = 966.90 MHz, IF Frequency = 85.38 MHz) 6 5 2 0 4 3 -30 deg C 25 deg C -4 2 80 deg C -6 1 -2 -30 deg C 25 deg C 80 deg C -8 0 -10 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 Vcc (V) Vcc (V) Figure 7. AMPS Mixer Noise Figure Figure 8. IIP3 of AMPS Mixer (RF Frequency = 881.52 MHz, LO Frequency = 966.90 MHz, IF Frequency = 85.38 MHz) (RF Frequency = 881.52 MHz, LO Frequency = 966.90 MHz, IF Frequency = 85.38 MHz) 10 Conexant Systems, Inc. 101251A August 24, 2000 RF250 Rx ASIC 10 16 9 8 14 Gain (dB) 12 10 8 -30 deg C 6 25 deg C 4 Noise Figure (dB) 18 7 6 5 4 80 deg C 0 2.6 2.8 3 3.2 3.4 3.6 25 deg C 80 deg C 1 0 2 2.4 -30 deg C 3 2 2.4 3.8 2.6 2.8 Vcc (V) 3 3.2 3.4 3.6 3.8 Vcc (V) Figure 9. CDMA Mixer Gain Figure 10. CDMA Mixer Noise Figure (RF Frequency = 881.52 MHz, LO Frequency = 966.90 MHz, IF Frequency = 85.38 MHz) (RF Frequency = 881.52 MHz, LO Frequency = 966.90 MHz, IF Frequency = 85.38 MHz) 10 14 8 12 6 10 2 8 0 -2 -30 deg C -4 25 deg C -6 80 deg C -8 -10 -30 deg C 6 Gain (dB) IIP3 (dBm) 4 25 deg C 4 80 deg C 2 0 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 2.4 2.6 2.8 3 Vcc (V) 3.2 3.4 3.6 3.8 Vcc (V) Figure 11. CDMA Mixer IIP3 Figure 12. PCS Mixer Conversion Gain (RF Frequency = 881.52 MHz, LO Frequency = 966.90 MHz, IF Frequency = 85.38 MHz) (RF Frequency = 1960 MHz, LO Frequency = 1749.62 MHz, IF Frequency = 210.38 MHz) 16 7 14 6 5 10 8 IIP3 (dBm) Noise Figure (dB) 12 -30 deg C 6 25 deg C 4 80 deg C 4 3 -30 deg C 2 25 deg C 80 deg C 1 2 0 0 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 Vcc (V) Vcc (V) Figure 13. PCS Mixer Noise Figure Figure 14. PCS Mixer IIP3 (RF Frequency = 1960 MHz, LO Frequency = 1749.62 MHz, IF Frequency = 210.38 MHz) (RF Frequency = 1960 MHz, LO Frequency = 1749.62 MHz, IF Frequency = 210.38 MHz) 101251A August 24, 2000 Conexant Systems, Inc. 11 Rx ASIC RF250 70 7 Noise Figure at Max Gain (dB) Max Gain (dB) 60 50 40 30 -30 deg C 20 25 deg C 10 80 deg C 0 6 5 4 -30 deg C 3 25 deg C 2 80 deg C 1 0 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 2.4 2.6 2.8 Vcc (V) 3 3.2 3.4 3.6 3.8 Vcc (V) Figure 15. VGA + I/Q Gain in AMPS Mode (Vcontrol = 2.7 V, Frequency = 85.38 MHz) Figure VGA Noise in AMPS Mode Figure 18.16. VGA + I/Q GainFigure in Cellular CDMA Mode (Vcontrol = 2.7 V, Frequency = 85.38 MHz) 0 60 -10 50 IIP3 (dBm) Max Gain (dB) -30 deg C -20 25 deg C -30 80 deg C -40 -50 40 30 -30 deg C 25 deg C 20 80 deg C 10 -60 -70 0 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 2.4 2.6 2.8 3.2 3.4 3.6 6 0 5 -10 4 -20 -30 deg C -30 25 deg C -30 deg C 3 25 deg C 80 deg C 2 3.8 80 deg C -40 -50 1 -60 0 Figure 17. VGA + I/Q IIP3 at Maximum Gain in AMPS 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 Mode -70 2.4 Vcc (V) Figure 19. VGA Noise Figure in Cellular CDMA Mode (Vcontrol = 2.7 V, Frequency = 85.38 MHz) 12 3 Vcc (V) IIP3 (dBm) Noise Figure at Max Gain (dB) Vcc (V) 2.6 2.8 3 3.2 Vcc (V) 3.4 3.6 3.8 Figure 20. VGA + I/Q IIP3 at Maximum Gain in CDMA Mode Conexant Systems, Inc. 101251A August 24, 2000 RF250 Rx ASIC 6 Noise Figure at Max Gain (dB) 60 Max Gain (dB) 50 40 30 -30 deg C 20 25 deg C 80 deg C 10 5 4 3 -30 deg C 2 25 deg C 1 80 deg C 0 0 2.4 2.6 2.8 3 3.2 3.4 3.6 2.4 3.8 2.6 2.8 3 Vcc (V) 3.6 Figure 21. VGA + I/Q Gain in PCS Mode Figure 22. VGA Noise Figure in PCS Mode (Vcontrol = 2.7 V, Frequency = 210.38 MHz) (Vcontrol = 2.7 V, Frequency = 210.38 MHz) 3.8 80 60 -10 -30 deg C 40 -20 25 deg C -30 Gain (dB) IIP3 (dBm) 3.4 Vcc (V) 0 80 deg C -40 20 0 -30 deg C -20 -50 25 deg C -40 -60 80 deg C -60 -70 2.4 2.6 2.8 3 3.2 3.4 3.6 0 3.8 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 Vcontrol (V) Vcc (V) Figure 23. VGA + I/Q IIP3 at Maximum Gain in PCS Mode Figure 24. VGA + I/Q Gain Over Temperature (Frequency = 85.38 MHz) 60 70 40 60 20 50 0 2.7 V 3.0 V 3.3 V 3.6 V -20 -40 -60 Current (mA) Gain (dB) 3.2 40 30 -30 deg C 20 25 deg C 10 80 deg C 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.4 Vcontrol (V) 2.8 3 3.2 3.4 3.6 3.8 Vcc (V) Figure 25. VGA + I/Q Gain vs. Control Voltage in Cellular Mode (Frequency = 85.38 MHz) 101251A August 24, 2000 2.6 Figure 26. Supply Current in The Cellular Band Conexant Systems, Inc. 13 Rx ASIC RF250 D D1 Downset paddle centrally located below the ETQFP package (shown for reference) D2 180 mils D D1 D2 10 mil micro-vias hole e b Dimensional sketch of the ground pattern for the downset paddle DETAIL A D1 Dim. A A1 A2 D A D1 D2 A2 L c L1 e b c Coplanarity A1 L DETAIL A L1 Millimeters Min. Max. 1.6 MAX 0.15 0.05 1.35 1.45 9.15 8.85 7.05 6.95 5.5 REF 0.5 0.75 1.0 REF Inches* Min. Max. 0.0630 MAX 0.0020 0.0059 0.0528 0.0571 0.3484 0.2736 0.3602 0.2776 0.2165 REF 0.0197 0.0295 0.0394 REF 0.500 REF 0.0197 REF 0.220 REF 0.11 0.17 0.10 MAX 0.0087 REF 0.0043 0.0067 0.0039 MAX Ref: 48-PIN ETQFP (GP00-D283) ** * Metric values (millimeters) should be used for PCB layout. English values (inches) are converted from metric values and may contain round-off errors. ** The package has a downset paddle to provide good RF ground contact and needs to be soldered to the ground plane on the PCB. NOTE: Package conforms to Jedec Standard MO-136 C085 Figure 28. RF250 Rx ASIC Package Dimensions - 48-pin TQFP Package With Downset Paddle 14 Conexant Systems, Inc. 101251A August 24, 2000 RF250 Rx ASIC 12.00±0.10 [0.472±.004] 1.50±.10 [0.06±.004] 4.00±0.10 [0.157±.004] 2.00±0.10 [0.079±.004] B A A 1.75±.10 [0.069±.004] 7.50±0.10 [0.295±.004] 16.00+.30/-.10 [0.630+.012/-.004] B 8˚ MAX. 1.50±.25 [0.06±.010] SECTION A-A SECTION B-B 5˚ MAX. .730±.013 [0.0287±.0005] 7.26±.10 [0.285±.004] 7.09±.10 [0.279±.004] 9.45±.10 [0.372±.004] 9.55±.10 [0.375±.004] NOTE: 1. Carrier Tape: Carbon Filled Polycarbonate. 2. Tape reel size: 13 inches. 3. All dimensions are in millimeters. Dimensions enclosed in [ ] are in inches and are for reference only. 2.43±.10 [0.096±.004] C604 Figure 29. 48-pin TQFP Tape and Reel Dimensions 101251A August 24, 2000 Conexant Systems, Inc. 15 Rx ASIC RF250 Ordering Information Model Name Manufacturing Part Number Rx ASIC RF250-32 Product Revision Information provided by Conexant Systems, Inc. Conexant is believed to be accurate and reliable. However, no responsibility is assumed by Conexant for its use, nor any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent rights of Conexant other than for circuitry embodied in Conexant products. Conexant reserves the right to change circuitry at any time without notice. This document is subject to change without notice. Conexant products are not designed or intended for use in life support appliances, devices, or systems where malfunction of a Conexant product can reasonably be expected to result in personal injury or death. Conexant customers using or selling Conexant products for use in such applications do so at their own risk and agree to fully indemnify Conexant for any damages resulting from such improper use or sale. Conexant and “What’s Next in Communications Technologies” are trademarks of Conexant Systems, Inc. Product names or services listed in this publication are for identification purposes only, and may be trademarks or registered trademarks of their respective companies. All other marks mentioned herein are the property of their respective holders. ©1999, 2000 Conexant Systems, Inc. All Rights Reserved 16 Conexant Systems, Inc. 101251A August 24, 2000 Further Information: [email protected] 1-800-854-8099 (North America) 33-14-906-3980 (International) Web Site www.conexant.com Hong Kong Phone: (852) 2 827 0181 Fax: (852) 2 827 6488 India Phone: (91 11) 692 4780 Fax: (91 11) 692 4712 World Headquarters Conexant Systems, Inc. 4311 Jamboree Road, P.O. Box C Newport Beach, CA 92658-8902 Phone: (949) 483-4600 Fax: (949) 483-6375 Korea - Seoul Office Phone: (82 2) 565 2880 Fax: (82 2) 565 1440 U.S. Florida/South America Phone: (727) 799-8406 Fax: (727) 799-8306 Europe Headquarters Conexant Systems France Les Taissounieres B1 1681 Route des Dolines BP 283 06905 Sophia Antipolis Cedex France Phone: (33 4) 93 00 33 35 Fax: (33 4) 93 00 33 03 U.S. Los Angeles Phone: (805) 376-0559 Fax: (805) 376-8180 U.S. Mid-Atlantic Phone: (215) 244-6784 Fax: (215) 244-9292 U.S. North Central Phone: (630) 773-3454 Fax: (630) 773-3907 U.S. Northeast Phone: (978) 692-7660 Fax: (978) 692-8185 U.S. Northwest/Pacific West Phone: (408) 249-9696 Fax: (408) 249-7113 U.S. South Central Phone: (972) 733-0723 Fax: (972) 407-0639 U.S. Southeast Phone: (919) 858-9110 Fax: (919) 858-8669 U.S. Southwest Phone: (949) 483-9119 Fax: (949) 483-9090 APAC Headquarters Conexant Systems Singapore, Pte. Ltd. 1 Kim Seng Promenade Great World City #09-01 East Tower Singapore 237994 Phone: (65) 737 7355 Fax: (65) 737 9077 Australia Phone: (61 2) 9869 4088 Fax: (61 2) 9869 4077 China Phone: (86 2) 6361 2515 Fax: (86 2) 6361 2516 Korea - Taegu Office Phone: (82 53) 745-2880 Fax: (82 53) 745-1440 Europe Central Phone: (49 89) 829 1320 Fax: (49 89) 834 2734 Europe Mediterranean Phone: (39 02) 9317 9911 Fax (39 02) 9317 9913 Europe North Phone: (44 1344) 486 444 Fax: (44 1344) 486 555 Europe South Phone: (33 1) 41 44 36 50 Fax: (33 1) 41 44 36 90 Middle East Headquarters Conexant Systems Commercial (Israel) Ltd. P.O. Box 12660 Herzlia 46733 Israel Phone: (972 9) 952 4064 Fax: (972 9) 951 3924 Japan Headquarters Conexant Systems Japan Co., Ltd. Shimomoto Building 1-46-3 Hatsudai, Shibuya-ku Tokyo, 151-0061 Japan Phone: (81 3) 5371 1567 Fax: (81 3) 5371 1501 Taiwan Headquarters Conexant Systems, Taiwan Co., Ltd. Room 2808 International Trade Building 333 Keelung Road, Section 1 Taipei 110 Taiwan, ROC Phone: (886 2) 2720 0282 Fax: (886 2) 2757 6760