U4256BM-NFS
U4256BM-NFS Datasheet
U4256BM
| Part | Datasheet |
|---|---|
U4256BM-NFS |
U4256BM-NFS (pdf) |
| Related Parts | Information |
|---|---|
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U4256BM-NFSG3 |
U4256BM-NFSG3 |
| PDF Datasheet Preview |
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| Frequency Synthesizer for Radio Tuning U4256BM The U4256BM is a synthesizer IC for FM receiver and an AM up-convertion system in BICMOS technology. Together with the AM/FM IC U4255BM, it performs a complete AM/FM car radio front end, which is recommended also for RDS Radio Data System applications. It is controlled by 3-wire bus and contains also switches and Digital to Analog Converters DACs for software controlled alignment of the AM/FM tuner. D Reference oscillator up to 15 MHz tuned D Four programmable switching outputs open drain D Oscillator buffer output for AM up/down conversion D Two programmable 16-bit dividers D Fine-tuning steps possible D Fast response time due to integrated loop push-pull stage D Three DACs for software controlled tuner alignment D Low power consumption D High S/N ratio D 3-wire bus enable, clock and data 3 V and 5 V micro- D Integrated band gap * only one supply voltage controllers acceptable necessary Block Diagram Tuning SWO1 SWO2 SWO3 SWO4 7 8 9 10 13 OSCIN 12 Oscillator OSCOUT 15 MX2LO OSC buffer CLK 17 DATA 16 EN 18 interface Switching outputs DAC3 VRef DAC2 DAC1 5 DAC3 4 DAC2 3 DAC1 divider DAC AM/FM VRef 19 FMOSCIN preamp 20 GNDan Ordering Information Extended Type Number U4256BM-NFS U4256BM-NFSG3 divider Phase detector Current sources Band-gap 14 V5 GND VS Figure Block diagram 1 PDO Package SSO20 Remarks Tube Taped and reeled Preliminary Information U4256BM Pin Description PDO 1 PD 2 DAC1 3 DAC2 4 DAC3 5 VS 6 U4256BM SWO1 7 SWO2 8 SWO3 9 SWO4 10 20 GNDan 19 FMOSCIN 18 EN 17 CLK 16 DATA 15 MX2LO 14 V5 13 OSCIN 12 OSCOUT 11 GND Pin Symbol Function PDO Phase detector output PD Pulsed current output DAC1 Digital-to-analog converter 1 DAC2 Digital-to-analog converter 2 DAC3 Digital-to-analog converter 3 VS Supply voltage analog part SWO1 Switching output 1 SWO2 Switching output 2 SWO3 Switching output 3 10 SWO4 Switching output 4 GND Ground, digital part 12 OSCOUT Reference oscillator output 13 OSCIN Reference oscillator input V5 Capacitor band gap |
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