CXA1691AM/AS FM/AM Radio For the availability of this product, please contact the sales office. Description CXA1691AM/AS is a one-chip FM/AM radio IC designed for radio-cassette tape recorders. Features • Small number of peripheral components. • Low current consumption (VCC=3 V) For FM : ID=5.8 mA (Typ.) For AM : ID=4.7 mA (Typ.) • Built-in FM/AM select switch. • Large output of AF amplifier. VCC=6 V, EIAJ output=450 mW (Typ.) when load impedance 8 Ω Function FM section • RF amplifier, Mixer and OSC (incorporating AFC variable capacitor). • IF amplifier • Quadrature detection • Tuning LED driver AM section • RF amplifier, Mixer and OSC (with RF AGC) • IF amplifier (with IF AGC) • Detector • Tuning LED driver AF section • Electronic volume control • FM muting CXA1691AM 28 pin SOP (Plastic) CXA1691AS 30 pin SDIP (Plastic) Absolute Maximum Ratings (Ta=25 °C) • Supply voltage VCC 14 V • Operating temperature Topr –10 to +60 °C • Storage temperature Tstg –50 to +125 °C • Allowable power dissipation PD 700 mW (CXA1691AM) PD 1000 mW (CXA1691AS) Recommended Operating Conditions Supply voltage VCC 2 to 7.5 V (CXA1691AM) VCC 2 to 8.5 V (CXA1691AS) Structure Bipolar monolithic IC 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— E98425-TE CXA1691AM/AS Block Diagram CXA1691AM Ripple AF VCC FILTER IN 26 25 24 AF GND OUT 28 27 DET AFC AFC OUT AGC AGC 23 22 21 AM IF DET AGC AF POWER AMP FM/AM FM AM BAND IF IN IF IN SELECT 17 16 15 IF GND METER NC 20 19 18 TUNING METER AM FE FM IF FM DISCRIMINATOR FM FE 1 2 MUTE 3 FM NF DISCRI 4 5 6 VOL AM OSC AFC 7 8 9 FM Reg OSC OUT FM RF 10 AM RF IN 11 NC 12 13 14 FM FE FM/AM RF IN GND FE OUT CXA1691AS AF GND GND OUT 30 29 28 VCC Ripple AF FILTER IN 27 26 25 DET AFC AFC OUT AGC AGC 24 23 22 IF GND METER NC 21 20 19 FM/AM FM AM BAND IF IN IF IN SELECT 18 17 16 AM IF DET AGC TUNING METER AF POWER AMP AM FE FM IF FM DISCRIMINATOR FM FE 1 2 MUTE NC 3 4 FM NF DISCRI 5 6 7 VOL AM OSC AFC 8 9 FM Reg OSC OUT —2— 10 FM RF 11 AM RF IN 12 NC 15 13 14 FM FE FM/AM RF IN GND FE OUT CXA1691AM/AS Standard Circuit Design Data No. 1 (1, 2) Symbol MUTE (The pin numbers in the parenthesis are for CXA1691AS.) Voltage (V) VCC=3 V VCC=6 V FM AM FM AM 0 0 0 Equivalent circuit Description 0 2 2 (3) FM DISCRI 1k 2.18 2.70 4.88 5.43 Phase-shift circuit Connect ceramic discriminator 1.2k 3 (4) NF VCC 1.5 1.5 3.0 3.0 ×100 Negative feedback pin 27 ×100 27 (28) AF OUT 1.5 1.5 3.0 3.0 GND 3 Power amplifier output pin 4 20k 4 (5) VOL CONT Connect variable resistor for electronic volume control. 1.25 1.25 1.25 1.25 80k GND 5 5 (6) AM OSC 1.25 1.25 1.25 1.25 6 (7) AFC 1.25 8 (9) REG OUT ∗ 1.25 3.6k ∗ 1.25 1.25 1.25 1.25 AM local oscillation circuit AFC variable capacitor pin 8 1.25V (REG) 6 Regulator pin 1.25 V (Typ.) 7 7 (8) FM OSC 1.25 1.25 1.25 1.25 FM local oscillation circuit —3— CXA1691AM/AS No. Symbol Voltage (V) VCC=3 V VCC=6 V FM AM FM AM Equivalent circuit 1.25 1.25 1.25 1.25 9 Description 3p 9 (10) FM RF Connect FM RF tuning coil 8k 12 (13) FM RF IN 0.3 0 0.3 10 (11) AM RF IN 1.25 1.25 1.25 1.25 12 0 FM RF input pin 1k 10 11 (12) NC 13 (14) GND (FE GND) 0 0 0 0 0 0 0 0 AM RF input pin VCC AM FM/AM 14 (15) FE OUT FM IF output pin of FM and AM. Connect IF filter. 0.36 0.2 0.36 0.2 220 14 VCC 15 (16) BAND SELECT 0.84 0 0.88 FM and AM bands selection switch pin. During GND it becomes AM and during open it becomes FM. 0 15 GND 16 (17) AM IF IN 0 0 0 0 17 (18) FM IF IN 1.30 0 1.30 0 16 Input pin of AM IF. 2k 17 360 Input pin of FM IF. GND 18 (19) NC 0 0 0 0 —4— CXA1691AM/AS No. Symbol Voltage (V) VCC=3 V VCC=6 V FM AM FM AM Equivalent circuit Description 19 ×3 1.25V 19 (20) METER Meter drive circuit (For tuning indicator) 1.6 1.6 4.5 4.5 N GND 20 (21) GND 0 0 0 0 21 (22) AFC/AGC 1.25 1.49 1.25 1.49 22 (23) AFC/AGC 1.25 1.25 1.25 1.25 22 33k 39k 21 23 AFC pin of W band. During AM, it determines time constant of AGC AFC pin of J band. During AM, it determines time constant of AGC. GND 23 (24) DET OUT 1.25 1.0 1.25 1.0 Detection output pin 11k 24 24 (25) AF IN 0 0 0 ×4 0 ×4 Power amplifier input pin 82k GND VCC 25 (26) RIPPLE FILTER 17k 2.71 2.71 5.4 5.4 25 73k Ripple filter 90k 26 (27) VCC 28 GND (29, 30) 3.0 3.0 6.0 6.0 0 0 0 Power supply pin 0 Power GND ∗ The pin voltage of pin 6 during AM, it is the same pin voltage of pin 22 (23) during J BAND and is the same pin voltage of pin 21 (22) during W BAND. —5— FM IF knee level 5 A — — A A A A A IB1 GV2 —6— A A — — — — B A — — — — B A — — — — B THD2 GV4 THD3 VD4 AM detection output distortion factor Audio voltage gain Audio distortion factor Muting level 13 14 15 A B B A A A A A 12 A — A A A 11 A — A IB2 AM detection output level 10 AM meter current AM IF voltage gain 9 A A A A A A A VD3 A B A B B B 6 A A A A A — A A — — A A — — A VD2 THD1 A — — A 1 A A A SW conditions 2 3 4 5 B A A A B A A B B A A B VD1 ID1 ID2 GV1 Symbol GV3 7 8 FM detection output distortion factor FM meter current AM front end voltage gain FM detection output level 4 6 AM circuit current FM circuit current FM front end voltage gain Item 1 2 3 No. Electrical Characteristics VE VE VE VD IM VD VD IM VB VD VD VD Test Point IA IA VA VIN3=90 dBµV, 10.7 MHz (1 kHz, 22.5 kHz DEV) VIN3=level at a point 3 dB down from VIN3=90 dBµV, 10.7 MHz (1 kHz, 22.5 kHz DEV) VIN3=90 dBµV, 10.7 MHz (1 kHz, 75 kHz DEV) VIN3=60 dBµV, 10.7 MHz VIN2=60 dBµV, 1660 kHz VIN3 when 455 kHz (1 kHz, 30 % MOD) output is –34 dBm VIN3=85 dBµV, 455 kHz (1 kHz, 30 % MOD) VIN3=85 dBµV, 455 kHz (1 kHz, 30 % MOD) VIN2=95 dBµV, 1660 kHz (1 kHz, 30 % MOD) VIN3=60 dBµV, 10.7 MHz VIN4=–30 dBm, 1 kHz Distortion factor for 50 mW output VIN3=60 dBµV, 10.7 MHz VIN4=–20 dBm, 1 kHz Muting level for 50 mW output VIN4=–20dBm, 1 kHz Attenuation for 60 dBµV input with VIN3 OFF No signal, AM No signal, FM VIN1=40 dBµV, 100 MHz Conditions 8 — 27 — 1.3 39 14 1.8 15 — — 39 — — 32 Min. 15 0.9 31.5 0.6 3.0 77.5 20 3.5 22 0.3 24 77.5 4.8 7.6 39 Typ. mA mA dB Unit dBµV mA dB % dBµV dB % dB % mA 0 dBµV=1 µV 22 2.5 36 2.0 7.0 155 mVrms 27 7.0 29 2.0 32 155 mVrms 10.0 14.0 46 Max. (See the Electrical Characteristics Test Circuit, Ta=25 °C, VCC=6 V) CXA1691AM/AS —7— VIN3 VB VA VIN1 VIN2 2k 330 0.01µ 30p 24p S2 CF1 B A 0.01µ 100 S3 B A IFT 2k B B A A S4 BAND AM SELECT IF IN 15 16 0.01µ S5 30p IM 1µ IF AGC NC METER GND AFC 18 19 20 21 0.01µ AFC FM OSC 4.7µ AGC AFC 22 B VD AM OSC 5 24p VOL 4 S1 B A NF 3 1µ 2 CF3 150 1 0.047µ100µ 5k VIN4 A 8 24k 24k GND VCC VE CF1 : AM 455kHz C.F. CF3 : FM DISCRIMINATOR IFT : AM 455kHz IFT OSC : AM OSC 0.047µ 470µ 33k 0.1µ 33k FM MUTE DISCRI 50k AF IN RIPPLE VCC AF OUT GND 24 25 26 27 28 S6 1µ 0.012µ 1µ DET OUT 23 6 8p 30p OSC 100k AFC 7 CXA1691AM 11 10 9 8 NC AM IN FM RF REG 0.01µ FM IF IN 17 10p 1000p 150µH 43p BPF 150 14 13 12 AM/FM FE FM IN IF OUT GND 10µ REG Electrical Characteristics Test Circuit CXA1691AM/AS —8— AM FM S1 ANT T1 14 C6 0.01µ 13 12 CF1 R5 330 BAND AM SELECT IF IN 15 16 CF2 FM IF IN 17 AM/FM FE FM IF OUT GND RF IN C5 10µ L1 10 AM RF 9 FM RF C12 10µ 50V 7 C13 4.7µ 50V R6 1k C14 10µ 50V AFC AGC 22 CXA1691AM 5 4 VOL D1 C17 10µ 50V 2 1 CF3 C22 0.1µ R3 150 C18 470µ 6.3V C21 220µ 10V GND 28 C20 0.1µ AF OUT 27 NF DISCRI MUTE 3 C4 6p C8 4.7µ 50V AF IN RIPPLE VCC 24 25 26 C15 C19 0.47µ/ 0.1µ 50V AM OSC C16 0.022µ AFC 6 C3 22p L4 R1 100k DET OUT 23 C7 1p FM OSC L3 REG OUT 8 C2 18p IF AFC NC METER GND AGC 18 19 20 21 NC 11 C1 2p L2 RV2 10k RV1 50k Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. C10 0.01µ R4 2.2k C11 100p BPF Application Circuit 1 EPJ S2 BATT CXA1691AM/AS —9— AM FM S1 ANT T1 C6 0.01µ 14 13 CF1 16 R5 330 17 NC 12 C1 2p 11 AM RF L2 FM RF 10 FM OSC 8 19 20 C12 10µ 50V 21 7 22 C13 10µ 50V 23 R6 1k C14 4.7µ 50V 24 DET OUT VOL 5 C16 0.022µ C17 10µ 50V 25 26 27 C15 C19 0.47µ/ 0.1µ 50V D1 3 C8 4.7µ 50 C4 6p C18 470µ 6.3V 28 29 GND 0.1µ 1 30 GND MUTE C21 C20 220µ 0.1µ 10V AF OUT NC 2 C22 R3 150 CF3 NF DISCRI 4 AF IN RIPPLE VCC AM OSC 6 C3 22p L4 R1 100k AFC C7 1p CXA1691AS REG OUT 9 C2 18p L3 IF AFC AFC NC METER GND AGC AGC CF2 18 BAND AM FM SELECT IF IN IF IN AM/FM FE FM IF OUT GND RF IN 15 C5 10µ L1 Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. C10 0.01µ R4 2.2k C11 100p BPF Application Circuit 2 R2 10k RV1 50k EPJ S2 BATT CXA1691AM/AS CXA1691AM/AS Coil data AM OSC Core diameter ø 0.06 mm 2UEW S 3 4 2 5 f (kHz) 1 6 796 L (µH) 1 to 3 270 QO 1 to 3 125 Number of widings (t) 1 to 3 4 to 6 107 29 Equivalent to L-5K7-H5 R12-1684X. Mitsumi Electric Co., Ltd. or 7TRS-8441X TOKO Co., Ltd. AM IFT 3 Core diameter ø 0.07 mm UEW S 4 2 5 1 6 CO (pF) 1 to 3 180 QO 1 to 3 90 Number of widings (t) 1 to 2 2 to 3 4 to 6 111 35 7 Equivalent to 21K7-H5 R12-8558A. Mitsumi Electric Co., Ltd. or 7MC-7789N TOKO Co., Ltd. FM RF φ 4mm φ 0.6mm 4.5t FM OSC φ 4mm φ 0.6mm 3.5t AM bar antenna f (kHz) 796 Primary L (µH) 650 Primary 91 t Secondary 20 t Secondary BPF CF1 CF2 CF3 PFWE8 (88 to 108 MHz) Soshin Electric Co., Ltd. SFU-455B SFE10.7MA5 CDA10.7MC1 Murata Mfg. Co., Ltd. Or BFCFL-455 TOKO Co., Ltd. Murata Mfg. Co., Ltd. Murata Mfg. Co., Ltd. —10— CXA1691AM/AS Package Outline Unit : mm 28PIN SOP (PLASTIC) CXA1691AM + 0.4 18.8 – 0.1 + 0.4 2.3 – 0.15 28 15 + 0.2 0.1 – 0.05 14 1 + 0.1 0.2 – 0.05 1.27 0.45 ± 0.1 0.24 0.5 ± 0.2 9.3 10.3 ± 0.4 + 0.3 7.6 – 0.1 0.15 M PACKAGE STRUCTURE SONY CODE SOP-28P-L04 EIAJ CODE SOP028-P-0375 JEDEC CODE PACKAGE MATERIAL EPOXY RESIN LEAD TREATMENT SOLDER PLATING LEAD MATERIAL 42/COPPER ALLOY PACKAGE MASS 0.7g 30PIN SDIP (PLASTIC) + 0.1 05 0.25 – 0. CXA1691AS + 0.4 26.9 – 0.1 30 + 0.3 8.5 – 0.1 10.16 16 0° to 15° 15 1 + 0.4 3.7 – 0.1 0.5 MIN 1.778 0.5 ± 0.1 3.0 MIN Two kinds of package surface: 1.All mat surface type. 2.All mirror surface type. 0.9 ± 0.15 PACKAGE STRUCTURE MOLDING COMPOUND EPOXY RESIN SONY CODE SDIP-30P-01 LEAD TREATMENT SOLDER/PALLADIUM PLATING EIAJ CODE SDIP030-P-0400 LEAD MATERIAL COPPER ALLOY PACKAGE MASS 1.8g JEDEC CODE NOTE : PALLADIUM PLATING This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame). —11—