ICs for Audio Common Use AN7504SB Pre-amp. and power amp. IC for 1.5 V headphone stereo ■ Overview 28 14 15 11.6±0.3 1 0.3±0.1 Unit: mm The AN7504SB is a low voltage operation headphone amp. IC for headphone C-cassette stereo. It incorporates tape selector, pre-amp. , soft AGC bass-boost circuit, etc. ■ Features (0.4) 7.2±0.3 9.3±0.3 2.05±0.2 • Headphone stereo 0.2 +0.1 −0.05 ■ Applications 0.9±0.1 0.1±0.1 0.9±0.1 0.8 • Low voltage operation (0.98 V to 2.0 V) • Tape selector switch built-in • Low frequency boost function with soft AGC SSOP028-P-0375A Note) The package of this product will be changed to lead-free type (SSOP028-P-0375E). See the new package dimensions section later of this datasheet. 15 REV/FWD/ 14 Pre-mute 12 PWR-out (R) 11 VCCP 10 GND 9 PWR-out (L) 8 7 SDC00029BEB STB/PWR mute 13 Control VRPF 6 5 4 3 Publication date: December 2001 16 17 18 Low BST PWR-in (R) 19 AGC Ripple filter Pre-in (L) 2 VREF Pre-in (R) 1 Bias 20 PWR-in (L) FWD/REV Pre-mute 21 22 23 Tape-select 24 Pre-out (L) 25 26 27 28 Pre-out (R) ■ Block Diagram 1 AN7504SB ■ Absolute Maximum Ratings Parameter Supply voltage Symbol Rating Unit VCC 2.1 V ICC 20 mA PD 42 mW Topr −20 to +70 °C Tstg −55 to +125 °C Supply current Power dissipation *2 Operating ambient temperature Storage temperature *1 *1 Note) *1: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25°C. Keep VCC (0.95 V to 0.98 V) free from any abnormal operation such as oscillation. *2: The power dissipation shown is the value for Ta = 75°C. For the independent IC without a heat sink. ■ Recommended Operating Range Parameter Supply voltage Symbol Range Unit VCC 0.98 to typ. 1.2 to 2.0 V ■ Electrical Characteristics at VCC = 1.2 V, f = 1 kHz, RL = 32 Ω, Ta = 25°C Parameter Symbol Conditions Min Typ Max Unit Voltage gain GV VO = −22.2 dBV 54 57 60 dB Circuit current 1 ICC1 VIN = 0, RG = 2.2 kΩ, LBST off 2.2 5.3 mA VO = −22.2 dBV 32.5 34 35.5 dB Max. output voltage VOmax(PB) THD = 1%, 30 kHz LPF on 120 210 mV Total harmonic distortion THD(PB) VO = 22.2 dBV, 30 kHz LPF on GVC = 35 dB (NAB) 0.2 0.6 % Output noise voltage VNO(PB) RG = 2.2 kΩ, 1HF-A −90 −76 dBV −85 −70 dB 21 23 25 dB Pre-amp. block Closed circuit voltage gain Mute attenuation GVC(PB) GMUTE(PB) Ratio as VO = −22.2 dBV Pre-mute on Boost low sound and power amp. block Voltage gain 1 GV1(PW) VO = −22.2 dBV Voltage gain 2 GV2(PW) LBOOST on, VO = −22.2 dBV 21.4 23.4 25.4 dB POUT THD = 10%, 30 kHz LPF on 2.5 4.5 mW Total harmonic distortion THD(PW) POUT = 1 mW, 30 kHz LPF on 0.35 1.3 % Output noise voltage 1 VNO1(PW) RG = 0.1, 1HF-A −91 −86 dBV Output noise voltage 2 VNO2(PW) LBOOST on, RG = 0, 1HF-A −86 −82 dBV −1.5 0 1.5 dB −96 −90 dBV Rating output power Channel balance Mute output voltage AGC level CB(PW) VO = −22.2 dBV VMUTE(PW) VIN = −32.2 dBV VAGC VIN = −45.2 dBV, f = 100 Hz RL = 32 Ω AGC level: 32 Ω edge measure 2 SDC00029BEB −17.3 −14.7 −13.1 dBV AN7504SB ■ Electrical Characteristics at VCC = 1.2 V, f = 1 kHz, RL = 32 Ω, Ta = 25°C (continued) Parameter Symbol Conditions Min Typ Max Unit 24 30 dB Ripple filter block Ripple rejection ratio RR VCC = 1.1 V, VRR = −32.2 dBV fRR = 100 Hz, IRFO = 15 mA BPF: 100 Hz, 1/4 OCT VRPF VCC = 1.0 V, IRFO = 15 mA 0.89 0.94 V VREF VCC = 1.0 V 0.68 0.76 0.83 V Threshold voltage at standby on VSTON Low: Power off 0.1 V Threshold voltage at standby off VSTOFF Open: Power on (Power mute on) VSTOFF = 1/2VCC − V13 − 0.2 0.2 V Bias voltage at power mute off VMTOFF Open: Power mute off VMTOFF = VCC − V13 0.1 V DC output voltage Bias block DC output voltage Control block Low threshold at FWD/REV/pre-mute VTH1L Low: REV 0.1 V High threshold at FWD/REV/pre-mute VTH1H High: Pre-mute on VTHIH = VCC − V1 0.1 V Low threshold at low boost off VLBOFF Low: LBOOST off 0.3 V Low threshold at tape select off VTPOFF Low: Tape-select off 0.3 V • Design reference data Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed. Parameter Circuit current 2 Symbol ICC2 Conditions POUT = 0.5 mW, × 2-ch., RL = 32 Ω Min Typ Max Unit 6.5 11.2 mA 7.2 9.5 12 kΩ Boost low sound and power amp. block Input resistance RIN(PW) SDC00029BEB 3 AN7504SB ■ Terminal Equivalent Circuits Note) The values mentioned below are the typical ones and is subject to change due to application condition and dispersion of IC. Pin No. Equivalent circuit 1 Description VCC Pins 26, 28 + Pins 1,3 200 kΩ 25 kΩ Waveform (typ.) PB-in (R): Playback amp. input Pins 25, 27 DC 0.78 V AC −66.2 dBV VREF GND 2 VREF: Reference voltage output 2 DC 0.78 V GND 4 + GND 3 Refer to pin 1 PB-in (L): Playback amp. input 4 Refer to pin 2 VREF-in: Reference voltage input DC 0.78 V RF-in: Ripple filter reference voltage input DC 1.0 V RF-base: Ripple filter DC 0.47 V VRPF: Ripple filter reference voltage output DC 1.13 V 5 VCC 70 kΩ Refer to pin 1 + 14 kΩ 5 100 kΩ 6 350 kΩ GND 6 7 GND 7 GND 4 SDC00029BEB AN7504SB ■ Terminal Equivalent Circuits (continued) Note) The values mentioned below are the typical ones and is subject to change due to application condition and dispersion of IC. Pin No. Equivalent circuit 8 Description VRPF AGC-TAU: AGC time constant Waveform (typ.) 8 GND 9 VCC Pins 9, 12 60 kΩ PWR-out (L): Power amp. voltage output + 4 kΩ DC 0.6 V AC −8.8 dBV GND 10 GND: GND pin 11 VCC: Power supply pin 12 Refer to pin 9 PWR-out (R): Power amp. voltage output 13 VRPF 220 kΩ 13 0V 1.2 V Refer to pin 9 STBY, PWR mute CNT: PWR-mute off Pin open: VCC − V13 < 0.1 V PWR-mute on − 0.2 V < 1/2VCC − V13 < 0.2 V STBY on V13 < 0.1 V FWD/REV/Pre-mute: FWD/REV/pre-mute control Pre-mute Voltage high: VCC − 0.1 < V14-19 FWD Pin open REV Voltage low: V14-19 < 0.1 GND 14 VRPF 120 kΩ 14 120 kΩ GND SDC00029BEB 5 AN7504SB ■ Terminal Equivalent Circuits (continued) Note) The values mentioned below are the typical ones and is subject to change due to application condition and dispersion of IC. Pin No. Equivalent circuit Description 15 VRPF 50 kΩ 15 L-BST CNT: Low boost on/off control Waveform (typ.) DC 0 V L-BST on Pin open L-BST off Voltage low: − 0.3 V < V11-19 < 0.3 V 10 kΩ 50 kΩ GND 16 L-BST C: Low boost Capacitor pin + 15 kΩ 7.5 kΩ 16 7.5 kΩ 15 kΩ VREF DC 0.78 V GND 17 VRPF LPF2-C: LPF2 Capacitor pin 45 kΩ 15 kΩ 17 + 7.5 kΩ VREF 18 3 kΩ + 18 30 kΩ DC 0.78 V GND VRPF L-BST C1: Low boost Capacitor pin 30 kΩ 3 kΩ DC 0.78 V VREF GND 6 SDC00029BEB AN7504SB ■ Terminal Equivalent Circuits (continued) Note) The values mentioned below are the typical ones and is subject to change due to application condition and dispersion of IC. Pin No. Equivalent circuit Description 19 VRPF 19 + 90 kΩ 10 kΩ VREF 20 PWR-in (R): Power amp. input 12 kΩ 2 kΩ VREF DC 0.78 V AC −32.2 dBV LPF1-C: LPF C pin VRPF 21 Waveform (typ.) DC 0.78 V 90 kΩ 10 kΩ 21 GND 20 PWR-in (L): Power amp. input Refer to pin 19 Tape-select on/off: Tape select driver Tape-select on/off: Tape select driver Tape-select on/off CNT: Tape select driver GND 22 Pins 22, 23 23 GND 24 VRPF 360 kΩ 20 kΩ 24 GND 25 Refer to pin 1 Driver on Voltage high Driver off V24 < 0.3 V PB-out (L): Playback amp. output DC 0.6 V AC −32.2 dBV SDC00029BEB 7 AN7504SB ■ Terminal Equivalent Circuits (continued) Note) The values mentioned below are the typical ones and is subject to change due to application condition and dispersion of IC. Pin No. Equivalent circuit 26 Refer to pin 1 Description Waveform (typ.) PB-NF(L): Playback amp. negative feedback input DC 0.78 V 27 Refer to pin 1 PB-OUT(R): Playback amp. input Refer to pin 25 28 Refer to pin 1 PB-NF(R): Playback amp. negative feedback input Refer to pin 26 ■ Application Notes 1. Operation logic of control pin Pin 24 Low High or Open Tape select control Off (Pins 22, 23 High) On (Pins 22, 23 Low) Pin 14 Low Open High Pre-amp. system control Reverse Forward Mute Input pin → Output pin Input pin → Output pin Pin 1 → Pin 25 Pin 1 → Pin 27 Pin 3 → Pin 27 Pin 3 → Pin 25 Pin 13 Low 1 Low 2 High Power amp. system control Standby on Standby off, Mute on Mute on Low 1: Short-circuit to GND Low 2: 0.6 V application or short circuit to GND with 220 kΩ 8 SDC00029BEB AN7504SB ■ Application Notes (continued) 2. Main characteristics 2. Distortion and amplitude at pre-amp. output Input Distortion/output voltage −10 10 VCC = 1.2 V 10 VCC = 1.2 V f = 1 kHz Distortion (%) Output (dBV) −20 −30 1 1 0.1 −40 0.1 Output voltage −50 10 100 1k 10k 0.01 −60 100k −50 Frequency (Hz) 0.01 4. Headphone amp. Input Distortion/output voltage 00 VCC = 1.2 V f = 1 kHz RL = 32 Ω Low boost off 10 Distortion 0.1 0.1 Output (dBV) 1 1 Output voltage (V) −10 Distortion (%) −40 Input amplitude (dBV) 3. Distortion and amplitude characteristics of headphone amp. 10 Distortion Output voltage (V) 1. Pre-amp. output frequency characteristics Output Input VCC = 1.2 V f = 100 Hz Low boost on 32 Ω end DETC = 0.047 µF −20 −30 Outpu voltage −20 −50 −40 −30 −40 −70 0.01 −20 −60 −50 −40 −30 Input amplitude (dBV) Input amplitude (dBV) 5. Headphone amp. Output Frequency 6. Distortion and amplitude at headphone amp. output Input Distortion/output voltage 10 PWR system VCC = 1.2 V PL = 32 Ω Low boost on 10 VCC = 1.2 V f = 100 Hz RL = 32 Ω Low boost on Distortion (%) Output (dBV) Distortion −30 −40 −50 10 1 1 Output voltage 0.1 100 1k 10k 0.01 −60 100k Frequency (Hz) −50 −40 0.1 −30 Output voltage (V) 0.01 −60 0.01 −20 Input amplitude (dBV) SDC00029BEB 9 AN7504SB ■ Application Notes (continued) 2. Main characteristics (continued) 8. Ripple filter output voltage (Using at 15 mA of current) 2.5 2.5 2.0 2.0 V7 (V) V7 (V) 7. Ripple filter output voltage (pin 7) 1.5 1.5 1.0 1.0 0.5 0.5 1.5 1.0 2.0 0.5 0.5 2.5 1.5 1.0 2.0 2.5 V11 (V) V11 (V) 9. VCC VREF 10. Pin 2 (VREF) at standby on/off and voltage at pin 7 (Ripple filter) 1.2 1.0 V7 (V) VREF (V) 1.0 0.5 0.5 STBY on 0 0 1.0 2.0 0 2.5 1.0 V13 (V) 11. Headphone amp. at mute on/off (Pin 9) output voltage 12. VCC I total 1.2 5 1.0 4 0.5 Mute on 0 0 0.5 3 2 1 Mute off 0 1.0 0 V13 (V) 10 0.5 VCC (V) I total (mA) Headphone amp. output voltage V9 (V) 0 0.5 1 1.5 V11 (V) SDC00029BEB 2 2.5 SDC00029BEB PWR mute on Head-phone out (R) VCCP GND C11 100 µF C10 47 µF C9 0.1 µF STBY on 14 13 12 11 10 15 16 17 18 19 20 Ripple filter C13 1 µF R6 50 kΩ Off C14 6.8 µF C15 0.15 µF C16 6.8 µF C17 1 µF C18 0.1 µF On 2.2 kΩ R9 VCC1 PWR mute off 220 kΩ REV FWD Pre-mute R5 R4 2.2 Ω C12 0.1 µF 2.2 Ω R3 9 C19 1 µF C20 0.022 µF R7 2.7 kΩ C21 0.022 µF R8 2.7 kΩ C22 1 µF C23 0.022 µF R11 6.8 kΩ R12 C24 33 µF 180 Ω C25 1 µF C26 0.022 µF R13 6.8 kΩ C27 R14 33 µF 180 Ω Head-phone in (R) Head-phone in (L) Tape-select Pre-out (L) Pre-out (R) Tape-select on : Open Tape-select off: Low C8 100 µF 21 22 23 24 25 26 27 28 1. Application circuit example Head-phone out (L) TR* 8 FWD/REV Pre-mute C7 0.47 µF 7 6 5 4 Bias C6 22 µF C5 33 µF C4 2.2 µF C3 1 µF 3 VREF 2 R2 2.2 kΩ C2 22 µF 1 2.2 kΩ VRPF Pre-in (L) Pre-in (R) C1 1 µF R1 2.2 kΩ AN7504SB ■ Application Circuit Examples R10 Base boost AGC Control REV : Low FWD : Open Pre mute: High STBY on : Low1 PWR mute on : Low2 PWR mute off: Open Note) *: The low VCE(SAT) PNP TR be used as TR. 11 AN7504SB ■ Application Circuit Examples (continued) 2. Evaluation board Pre out R-ch. Pre out L-ch. Head-phone In R-ch. Head-phone In L-ch. R10 R14 C26 C23 R12 R7 R9 R8 14 1 C2 28 AN7504SB C1 C3 C5 C7 Pre-amp. in R-ch. Head-phone Out R-ch. R3 C9 Head-phone Out L-ch. R4 C12 R5 Pre-amp. in L-ch. C4 C6 C8 C11 TR R1 R2 C10 On Pre-amp. REV FWD Mute ■ New Package Dimensions (Unit: mm) • SSOP028-P-0375E (Lead-free package) 11.60±0.20 28 15 +0.10 0.20-0.05 7.20±0.20 9.30±0.30 (1.05) 0° to 10° 0.80 Seating plane 12 14 0.30+0.10 -0.05 0.10±0.10 1 (0.60) 2.05±0.20 (0.40) SDC00029BEB Seating plane C27 C21 C20 15 R13 C25 C24 R11 C22 C19 C18 C13 On STBY Mute off Mute Head-phone C17 R6 Off Tape-select Off VCC Off C16 C15 C14 Base boost On Request for your special attention and precautions in using the technical information and semiconductors described in this material (1) An export permit needs to be obtained from the competent authorities of the Japanese Government if any of the products or technologies described in this material and controlled under the "Foreign Exchange and Foreign Trade Law" is to be exported or taken out of Japan. (2) The technical information described in this material is limited to showing representative characteristics and applied circuit examples of the products. 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