T4258-ILQ
T4258-ILQ Datasheet
T4258
| Part | Datasheet |
|---|---|
T4258-ILQ |
T4258-ILQ (pdf) |
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| AM/FM Receiver IC T4258 The T4258 is an integrated AM/FM frontend circuit in BICMOS technology. It contains a double conversion system for FM and an up-/down conversion circuit for AM IF1 = MHz, IF2 = 450 kHz . A complete automatically aligned high performance AM/FM tuner can be built together with the PLL U4256BM. This ICs are designed for high performance car radio applications. Electrostatic sensitive device. Observe precautions for handling. D Receiving condition analyzer D Integrated band filter for 2nd IF; with software controlled bandwidth D Pin compatible with U4255BM D FM-double conversion system D World tuner, US Weatherband, J-band D Completely integrated FM demodulator D Soft mute and multipath noise cancellation D AM up-/down conversion system D AM stereo capability D Stop signal generation for AM and FM D Automatic alignment possible D 3-wire bus controlled Block Diagram IF1FMI IF1AMI V3 MX2OB MX1OA MX1OB IF1REF IF1OUT MX2IN MX2OA 38 39 33 30 29 26 23 IF2IN V3P AM Dem. OPLPF 32 MX1AMA MX1AMB AMAGC AMVREG AMPLPF blanker MX1FMA 1 MX1FMB 2 GNDMX 4 OSCOUT 16 GNDOSC 15 OSCE 14 OSCB 13 Divider Offset Divider V3 OSC Bandgap ÏÏ 12 25 42 5 17 18 19 9 V57 VS EN DATA METER Ordering Information Extended Type Number T4258-ILQ T4258-ILS SSO44 Package Remarks Taped and reeled Tube T4258 Pin Description Pin Symbol Function 1 MX1FMA 1st mixer FM input A 2 MX1FMB 1st mixer FM input B 3 MX1AMB 1st mixer AM input B 4 GNDMX Ground 1st mixer 5 FMAGC FM preamplifier AGC 6 AMVREG AM control voltage 7 AMAGC AM preamplifier AGC 8 AMPLPF AM AGC LP filter 9 METER Fieldstrength output 10 ADJAC Adjacent channel detection output 11 MPX Multiplex signal V57 V reference voltage 13 OSCB Oscillator basis 14 OSCE Oscillator emitter 15 GNDOSC Oscillator ground 16 OSCOUT Oscillator output 3-wire bus enable 18 CLK 3-wire bus clock 19 DATA 3-wire bus data 20 IF2OUT 2nd IF amplifier output INT Interrupt, stop signal, test out 22 MX2LO MHz input for 2nd mixer 23 MX2OB 2nd mixer output B 24 MX2OA 2nd mixer output A 25 GND Ground 26 MX2IN 2nd mixer input V3P 3 V ref. for AMPIN, AMIFAGC, Control, IF2IN 28 IF2IN 2nd IF amplifier input 3 V reference for IF1OUT, MX2IN 30 IF1OUT 1st IF amplifier output DEV Deviation detect output 32 OPLPF Operating point LPF |
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