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CXA3556N Dataheets PDF



Part Number CXA3556N
Manufacturers Sony Corporation
Logo Sony Corporation
Description IF Down Converter for Digital Broadcast
Datasheet CXA3556N DatasheetCXA3556N Datasheet (PDF)

CXA3556N IF Down Converter for Digital Broadcast Description The CXA3556N is a one-chip integrated IC that processes IF signals of a digital broadcast tuner and includes an AGC amplifier circuit, a mixer circuit, a local oscillator circuit and an output amplifier circuit. The package utilizes a 24-pin SSOP suitable for surface mounting. Features • AGC control width that has a 56dB variable range • Low noise characteristics • Low distortion characteristics (in particular, during AGC gain reductio.

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CXA3556N IF Down Converter for Digital Broadcast Description The CXA3556N is a one-chip integrated IC that processes IF signals of a digital broadcast tuner and includes an AGC amplifier circuit, a mixer circuit, a local oscillator circuit and an output amplifier circuit. The package utilizes a 24-pin SSOP suitable for surface mounting. Features • AGC control width that has a 56dB variable range • Low noise characteristics • Low distortion characteristics (in particular, during AGC gain reduction) • Includes switching function between down converter mode and linear amplifier mode • Variable output amplifier gain by changing external resistance • Includes RF AGC output pin • Variable RF AGC settings • AGC control curve characteristics with excellent linearity Applications Digital broadcast tuners Structure Bipolar silicon monolithic IC 24 pin SSOP (Plastic) Absolute Maximum Rating (Ta = 25°C) • Supply voltage Vcc –0.3 to +12 • Operating temperature Topr –55 to +150 Operating Conditions • Supply voltage Vcc • Operating temperature Topr V °C 4.75 to 5.25 –25 to +75 V °C 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– E02426-PS CXA3556N Block Diagram and Pin Configuration IFIN1 1 24 AGCIN IFIN2 2 23 MODESEL RFAGC 3 Comparator 22 AGCGND IREG 4 REG 21 AO2 VREG 5 AGC Amp. Output Amp. 20 AO1 LOB1 6 19 GND LOC1 7 18 AGCREF LOC2 8 OSC Mixer 17 E2 LOB2 9 16 E1 VCC1 10 15 AIN2 MO1 11 14 AIN1 MO2 12 13 VCC2 –2– CXA3556N Pin Description and Equivalent Circuit Pin No. Symbol Pin voltage Equivalent circuit Pin description 1 IFIN1 1.4V 10 VCC1 1 2 5k 5k IF inputs. 2 IFIN2 1.4V 22 AGCGND 3 3 RFAGC — 22 AGCGND RF AGC voltage output. Comparator output. Low level: 0.4V or less High level: 8V or more VCC1 10 4 IREG 2.6V 4 Connects external resistance 27kΩ. 22 AGCGND 10 VCC1 5 VREG 3.3V 5 Connects external capacitance 1µF. 22 AGCGND 6 LOB1 2.9V 10 6 8 7 9 VCC1 7 LOC1 3.7V Connects external capacitance and crystal oscillator. 8 LOC2 3.7V 19 GND 9 LOB2 2.9V –3– CXA3556N Pin No. 10 Symbol VCC1 Pin voltage 5V 10 Equivalent circuit Pin description Power supply. VCC1 11 MO1 2.3V 11 12 Mixer output pin. 12 MO2 2.3V 19 GND 13 14 VCC2 AIN1 5V 1.3V 10 200 VCC1 Power supply. 15 AIN2 1.3V 14 200 15 16 E1 0.6V 19 10k 10k Output amplifier circuit inputs. Gain of output amplifier circuit can be changed by connecting external resistance between Pins 16 and 17. GND 17 E2 0.6V 17 16 10 VCC1 90µA 18 18 AGCREF — RF AGC setting voltage adjustment pin. Connect external resistance between Pin 18 and GND and change the value to change RF AGC output voltage. 22 AGCGND 19 GND 0V VCC1 GND 20 AO1 2.7V 10 20 21 Output amplifier output. 21 AO2 2.7V 19 GND –4– CXA3556N Pin No. 22 Symbol AGCGND Pin voltage 0V Equivalent circuit Pin description AGC circuit GND. Selects either IF down converter mode or linear amplifier mode. When the voltage applied to this pin is 0.3V or less, the mode is down converter mode. When the voltage is 4.75 to 5.25V, the mode is linear amplifier mode. 20k 23 MODESEL — 23 22 GND 10 VCC1 24 AGCIN — 24 22 AGC control. Input voltage range is 0 to 2.2V. AGCGND –5– CXA3556N Electrical Characteristics (VCC = 5V, Ta = 25°C) (1) IF down converter mode (fvco = 49.38MHz) Item Symbol Measurement conditions Input signal = no signal AGC_IN voltage = 0V Input signal = 1 wave (43.5MHz), AGC_IN voltage = 2.2V Output signal = 1Vp-p Input signal = 1 wave (43.5MHz), AGC_IN voltage = 0V Output signal = 1Vp-p G3 = G1 – G2 Input signal = 2 waves (43.5MHz, 43.6MHz)/–26dBm Output signal = 1Vp-p Input signal = 2 waves (43.5MHz, 43.6MHz)/–21dBm Output signal = 1Vp-p Input signal = –60dBm (43.5MHz) Output signal = 1Vp-p Input signal = –20dBm (43.5MHz) Output signal = 1Vp-p Min. 44 65 10 54 –44 –42 — — Typ. Max. Unit 63 68.5 12.2 56 –51 –51 77 73 15 58 — — mA dB dB dB dBc dBc Current ICCA consumption A Gain 1 Gain 2 Gain width IM3_1 IM3_2 G1 G2 G3 DIS1 DIS2 Output noise 1 NF1 Output noise 2 NF2 –100 –96 dBc/Hz –120 –111 dBc/Hz (2) Linear amplifier mode Item Symbol Measurement conditions Input signal = no signal AGC_IN voltage = 0V Input signal = 1 wave (43.5MHz), AGC_IN voltage = 2.2V Output signal = 1Vp-p Input signal = 1 wave (43.5MHz), AGC_IN voltage = 0V Output signal = 1Vp-p G6 = G4 – G5 Input signal = 2 waves (43.5MHz, 43.6MHz)/–26dBm Output signal = 1Vp-p Input signal = 2 waves (43.5MHz, 43.6MHz)/–21dBm Output signal = 1Vp-p Input signal = –60dBm (43.5MHz) Output signal = 1Vp-p Input signal = –20dBm (43.5MHz) Output signal = 1Vp-p Min. 44 65 1.


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