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CXA1741Q Dataheets PDF



Part Number CXA1741Q
Manufacturers Sony Corporation
Logo Sony Corporation
Description IF Amplifier for Analog Cellular Communications
Datasheet CXA1741Q DatasheetCXA1741Q Datasheet (PDF)

CXA1741Q IF Amplifier for Analog Cellular Communications For the availability of this product, please contact the sales office. Description The CXA1741Q is an analog cellular(TACS/ NTACS) FM IF IC which incorporates an IF filter. Features • Incorporates a ceramic filter function, which is normally mounted externally. • Quadrature detection discriminator function. • This IC has almost all IF functions and is ideal for reduction in set size because of few external parts required. • The built-in fi.

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CXA1741Q IF Amplifier for Analog Cellular Communications For the availability of this product, please contact the sales office. Description The CXA1741Q is an analog cellular(TACS/ NTACS) FM IF IC which incorporates an IF filter. Features • Incorporates a ceramic filter function, which is normally mounted externally. • Quadrature detection discriminator function. • This IC has almost all IF functions and is ideal for reduction in set size because of few external parts required. • The built-in filter permits mode changeover between TACS and NTACS. • Wide operating voltage range (2.7 V to 3.6 V) and low current consumption (Icc=10 mA (typ.) when Vcc= 3 V). • Wide range and excellent temperature characteristics for the RSSI (receiving signal strength indicator). Applications Ideally suited for cellular phones, particularly handheld sets. Structure Bipolar silicon monolithic IC 40 pin QFP (Plastic) Absolute Maximum Ratings (Ta = 25°C) • Supply voltage VCC 5 V • Operating temperature Topr –35 to +85 °C • Storage temperature Tstg –65 to +150 °C • Allowable power dissipation PD 500 mW Operating Conditions Supply voltage VCC 2.7 to 3.6 V Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits. —1— E94245-TE CXA1741Q Block Diagram and Pin Configuration (Top View) MIXADJ1 MIXADJ2 MIXPS MIXIN IFPS GND 30 T4 31 29 28 27 26 25 24 VCC 23 22 IFIN T3 21 20 XTALIN PSN T5 32 PSN VCC1 33 MIXER RF AMP 19 XTALOUT GND 18 AGCPS 17 VREF 16 RSSIPS 15 T2 14 RSDETPS 13 T1 12 GND2 11 VCC2 10 GND1 34 BPF0 T6 35 1/2 OSC AGC FADJ1 36 FADJ2 37 BPF1 RSSI SGND 38 BIAS LIM DET BPFPS1 39 BPFPS2 40 1 SW(TACS/NTACS) 2 NC 3 BPFO 4 5 6 AUDIO 7 RSSI 8 GADJ(RSSI) 9 IF2 Note) Pins 21 and 25 are connected via the IC internal wiring. Pins 12, 21 and Pins 25, 34 are connected via IC internal resistors. When designing a PCB, ensure that all GND pins of IC are connected to the GND on PCB with its connection wiring distance minimized. —2— LIMPS CXA1741Q Pin No. 1 Symbol SW TACS NTACS Pin voltage DC AC 0V OPEN HIGH (3 V) I/O resistance 31 Equivalent circuit Description Changeover switch for built-in filter. TACS for Low; NTACS for High. ( ) 20µA 50k 1 50k VREF GND 34 2 3 4 5 NC BPFO 1.8 V Not internally connected. BPF output monitor. Not used normally. Connected to the LIM and RSSI inputs in the IC. 33 147 3 4 5 34 B.P.F N.F.B Network LIM RSSI 6 AUDIO 2.1 V 11 Outputs an AUDIO signal which is FM-detected. 1k 6 12 —3— CXA1741Q Pin No. 7 Symbol RSSI Pin voltage DC AC 1.2 V I/O resistance Equivalent circuit Description RSSI output. Outputs a DC voltage in accordance with the signal input to the RF amplifier. 11 147 7 12 8 GADJ 0.2 V Adjusts the RSSI amplifier gain (varies the resistance so as to obtain a linear RSSI output). 147 8 147 7 9 IF2 0.9 V 11 Limiter operation monitor. Not used normally. 147 9 12 10 LIMPS 1.8 V 11 Connects a limiter integrating capacitor. 10 12 —4— CXA1741Q Pin No. 11 Symbol VCC2 Pin voltage DC AC 3.0 V I/O resistance Equivalent circuit Description Power supply. Supplies current to the LIM, DET, and RSSI circuits. Ground. IC operation check. Connects an RSSI detector integrating capacitor. 12 13 14 GND2 T1 0V RSDETPS 1.4 V 11 147 14 12 15 16 T2 RSSIPS 1.8 V 11 IC operation check. Connects an RSSI integrating capacitor. 16 12 17 VREF 1.3 V 33 17 34 reference voltage used in the internal circuit Monitor for the reference voltage used in the internal circuit. When connected to an external capacitor, this pin also functions to lower the reference voltage dynamic impedance. —5— CXA1741Q Pin No. 18 Symbol AGCPS Pin voltage DC AC 0.2 V I/O resistance Equivalent circuit Description Connects an AGC integrating capacitor. 33 18 VREF 34 15 19 XTALOUT 2.9 V 24 147 20 10k 15p 10k 19 20 XTALIN 2.9 V Connect a crystal oscillator to form a Colpitts-type oscillator circuit. When an external oscillator is used, its input must be connected to Pin 20. 25 21 21 22 GND IFIN 0V 1.3 V 24 23 IFPS 1.3 V 22 1.5k 1.5k 23 VREF 21 25 Ground. RF amplifier input. The relationship between IFIN (Pin 22) and IFPS (Pin 23) is designed so that the IC internal stray capacitance is small. Therefore, if Pins 22 and 23 are used for balance input, the common-mode rejection deteriorates. Power supply. Supplies current to the RF AMP, MIXER, OSC, and 1/2 DIVIDER circuits. Ground. 24 VCC 3.0 V 25 GND 0V —6— CXA1741Q Pin No. 26 Symbol MIXIN Pin voltage DC AC 1.3 V I/O resistance Equivalent circuit Description RF AMP output monitor. Connected to the MIXER input in the IC. 27 2.


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