ICs for Audio Common Use AN7531SA Headphone amplifier IC for portable equipment ■ Overview Unit: mm AN7531SA is an audio signal processing IC in which bass boost amplifiers, ALC circuit and beep circuit are built in the headphone amplifiers for use in portable equipment. Its headphone output block is using the center amplifier method which eliminates the need for coupling capacitor so that the circuit is most suitable for rationalization of audio circuit. 1 12 ■ Applications 0.65 0.22+0.1 –0.05 1.2±0.2 +0.1 0.15–0.05 0.525±0.1 (0.625) 0.525±0.1 (0.5) ■ Features • Output coupling capacitor is not required (Center amplifier method) • Built-in bass boost amplifiers • ALC circuit • Built-in mute circuit • Built-in beep circuit • With mixed output pin of power amplifier 0.1±0.1 13 6.1±0.3 24 8.1±0.3 7.8±0.3 Seating plane SSOP024-P-0300B Note) The package of this product will be changed to lead-free type (SSOP024-P-0300E). See the new package dimensions section later of this datasheet. • Portable CD and MD players, etc. Standby SW Mute SW ATT SW Beep 11 10 9 8 7 5 4 3 2 1 6 SDC00038CEB 12 ALC det. C-amp. SW Publication date: December 2001 13 14 15 16 17 18 19 Bias 20 22 BST SW 21 23 24 ■ Block Diagram 1 AN7531SA ■ Pin Descriptions Pin No. Description Pin No. Description 1 Bass boost amplifier NF 13 Attenuation SW 2 ch.1 and ch.2-mixed output pin 14 ch.1 input pin 3 Ripple filter 15 ch.2 input pin 4 Center amplifier output control SW 16 GND (input) 5 Supply pin 17 Beep sound input pin 6 ch.2 output pin 18 Mute time-constant pin 7 Center amplifier output pin 19 Mute control pin 8 ch.1 output pin 20 Standby control pin 9 GND (output) 21 Bias output pin 10 Mixed output pin of power amplifier 22 Bias input pin 11 ALC input pin 23 Bass boost control pin 12 ALC detection pin 24 Bass boost amplifier output pin ■ Absolute Maximum Ratings Parameter Supply voltage *2 Symbol Rating Unit VCC 4.6 V ICC 200 mA PD 370 mW Topr −25 to +75 °C Tstg −55 to +125 °C Supply current Power dissipation *3 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. *2: Without signal. *3: Ta = 75°C, mounted on standard board (Refer to the Application Notes). ■ Recommended Operating Range Parameter Supply voltage 2 Symbol Range Unit VCC 1.8 to 4.5 V SDC00038CEB AN7531SA ■ Electrical Characteristics at Ta = 25°C Parameter Symbol Conditions Min Typ Max Unit Standby current ISTB VIN = 0 mV, STB: On 0.1 5 µA Quiescent current 1 ICQ1 VIN = 0 mV, C-CUP: On 1.5 3.0 mA Quiescent current 2 ICQ2 VIN = 0 mV, C-CUP: Off 2.0 4.0 mA Voltage gain 1 GV1 VOUT = −22 dBV, ATT: On 5.5 8.3 10.5 dB Voltage gain 2 GV2 VOUT = −22 dBV, ATT: Off 14 15.9 18 dB Channel balance CB VOUT = −22 dBV −1.0 0 1.0 dB Maximum output power PO THD = 10%, VCC = 2 V 5.0 9.0 mW Total harmonic distortion THD VOUT = −12.2 dBV 0.1 0.5 % Output noise voltage VNO Rg = 600 Ω −94.5 −88 dBV Channel cross-talk CT VOUT = −12.2 dBV 30 50 dB Ripple rejection RR VCC = 1.8 V, fr = 100 Hz, Vr = −20 dBV 64 72 dB Mute attenuation MT VOUT = −12.2 dBV 68 78 dB VBEEP VBEEP-IN = 0 dBV −56 −51 −46 dBV VOUT = −30 dBV, f = 100 Hz 9.7 11.7 13.7 dB Beep sound output voltage Boosting amount BST ALC detection level VALC VIN = −20 dBV −41.5 −39.5 −37.5 dBV Note) Condition: VCC = 2.4 V, RL = 16 Ω, f = 1 kHz, Rg = 10 kΩ, STB: On, Mute: Off, C-CUP: Off, ATT: Off, ALC: Off, BST: Off *1: Measurement using A curve filter *2: Measurement using 30 kHz LPF ■ Application Notes 1. PD Ta curves of SSOP024-P-0300B PD T a 900 800 Mounted on standard board (glass epoxy: 50 mm × 50 mm × t0.08 mm) Rth(j-a) = 135.1°C/W 740 Power dissipation PD (mW) 700 600 500 400 390 300 Independent IC without a heat sink Rth(j-a) = 256.4°C/W 200 100 0 0 25 50 75 100 125 Ambient temperature Ta (°C) SDC00038CEB 3 AN7531SA ■ Application Notes (continued) 2. Main characteristics ICC VCC (STB: 0 V, Mute: On) Power supply current ICC (mA) 3.5 3.0 VIN = 0 mV RL = 16 Ω Rg = 10 kΩ STB = 0 V/VCC Mute = 0 V/VCC 2.5 ICC VCC 4.5 ALC = Off BST = Off ATT = On/off CCUP = Off/on ICC4 (BTL) Mute = On 2.0 ICC3 (C-CUP) Mute = On 1.5 1.0 0.5 1.5 2.0 2.5 3.0 3.5 4.0 4.5 3.5 ICC (SEPP) BST = On 3 2.5 ICC5 (SEPP) 2 1.5 1 ICC (BTL) BST = On 0.0 1.0 5.0 1.5 Power supply voltage VCC (V) 2.0 ICC VCC (ALC: On, ATT: On) 3.5 4.0 4.5 5.0 ICC7, 8 VCC ICC (BTL) ALC = On VIN = 0 mV RL = 16 Ω 3.0 Rg = 10 kΩ STB = VCC Mute = 0 V 2.5 ALC = On/off BST = Off ATT = On/off CCUP = Off/on 14 ICC (BTL) ATT = On 2.0 1.5 ICC (C-CUP) ALC = On 1.0 ICC (C-CUP) ATT = On Power supply current ICC (mA) Power supply current ICC (mA) 3.0 15 3.5 0.5 13 ICC8 (BTL) 12 11 VOUT = 0.5 mV f = 1 kHz RL = 16 Ω Rg = 10 kΩ STB = VCC Mute = 0 V 10 9 8 7 ALC = Off BST = Off ATT = On/off CCUP = Off ICC7 (SEPP) 6 0.0 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5 1.0 5.0 2.0 2.5 3.0 3.5 4.0 Power supply voltage VCC (V) ICC PO ICQ VSTB ICC (BTL) 10 ICC (C-CUP) 0.10 4.5 5.0 3.0 STB = VCC Mute = 0 V ALC = Off BST = Off ATT = Off CCUP = Off Power supply current ICC (mA) VCC = 2.4 V f = 1 kHz RL = 16 Ω Both ch. input Rg = 10 kΩ 1 0.01 1.5 Power supply voltage VCC (V) 100 Power supply current ICC (mA) 2.5 ALC = Off BST = On/off ATT = On/off CCUP = Off Power supply voltage VCC (V) 4.0 1.00 VCC = 2.4 V VIN = 0 mV RL = 16 Ω Rg = 10 kΩ Mute = 0 V 2.5 ALC = Off BST = Off ATT = Off CCUP = Off 2.0 1.5 1.0 0.5 0.0 0.0 10.00 Output power PO (mW) 4 VIN = 0 mV RL = 16 Ω Rg = 10 kΩ STB = VCC Mute = 0 V 0.5 ICC1 (C-CUP) STB = 0 V, ICC2 (BTL) STB = 0 V 0.0 1.0 ICC6 (BTL) 4 Power supply current ICC (mA) 4.0 0.5 1.0 1.5 Standby voltage VSTB (V) SDC00038CEB 2.0 2.5 AN7531SA ■ Application Notes (continued) 2. Main characteristics (continued) PO VCC f = 1 kHz 100 THD = 10% RL = 16 Ω 90 Both ch. input Rg = 10 kΩ 80 STB = VCC Mute = 0 V 70 THD PO 100 ALC = Off BST = Off ATT = Off CCUP = Off Total harmonic distortion THD (%) Maximum output power PO (mW) 110 60 50 40 Ch.1, Ch.2 30 20 10 VCC = 2.4 V f = 1 kHz RL = 16 Ω Both ch. input Rg = 10 kΩ A-curve filter STB = VCC Mute = 0 V ALC = Off BST = Off ATT = Off CCUP = Off 10 kHz ch.1, ch.2 1 1 kHz ch.1, ch.2 0.1 100 Hz ch.1, ch.2 10 0 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 0.01 0.10 5.0 1.00 Power supply voltage VCC (V) PO , THD VIN (ALC: On) −25 −30 6 THD (ALC : Off) 4 −35 VO (ALC : On) −40 2 THD (ALC : On) −45 −50 −70 −60 0 −50 −40 −30 −20 −30 GV (BST : Off) −40 10 0 100 1k 10k Beep VIN GV VCC STB = VCC Mute = 0 V/VCC ALC = Off BST = Off ATT = Off CCUP = Off VBEEP (ch.2 Mute : Off) −60 −70 18 GV1 (ch.1 ATT : Off), GV1 (ch.2 ATT : Off) 16 14 12 10 GV2 (ch.1 ATT : On), GV2 (ch.2 ATT : On) 8 VOUT = −20 dB f = 1 kHz RL = 16 Ω Both ch. input Rg = 10 kΩ 6 4 VBEEP (ch.1 Mute : Off) 2 0 200 400 600 800 100k 20 −90 −100 −25 VCC = 2.4 V VIN = −46 dBV RL = 16 Ω Both ch. input Rg = 10 kΩ STB = VCC Mute = 0 V ALC = Off BST = On/off ATT = Off CCUP = Off −35 0 −50 −80 GV (BST : On) Frequency f (Hz) −30 −40 −10 −20 Input voltage VIN (dBV) VCC = 2.4 V VIN = 0 mV RL = 16 Ω Rg = 10 kΩ −10 −20 Output voltage GV (dBV) −20 −15 Output voltage gain GV (dB) −15 8 VO (ALC : Off) Total harmonic distortion THD (%) Output voltage VO (dBV) −10 Beep output voltage VBEEP (dBV) −10 10 VCC = 2.4 V f = 1 kHz RL = 16 Ω Both ch. input Rg = 10 kΩ STB = VCC Mute = 0 V ALC = Off/on BST = Off ATT = Off CCUP = Off 100.00 GV frequency 0 −5 10.00 Output power PO (mW) 0 1.0 1 000 1 200 1 400 1 600 1.5 2.0 2.5 3.0 3.5 STB = VCC Mute = 0 V ALC = Off BST = Off ATT = On/off CCUP = Off 4.0 4.5 5.0 Power supply voltage VCC (V) Beep input voltage VBEEP-IN (mV[p-p]) SDC00038CEB 5 AN7531SA ■ Application Notes (continued) 2. Main characteristics (continued) CT, MT VIN 90 90 90 80 80 80 60 50 40 30 20 10 VCC = 2.4 V VOUT = −20 dBV RL = 16 Ω Both ch. input Rg = 10 kΩ A-curve filter STB = VCC Mute = 0 V/VCC ALC = Off BST = Off ATT = Off CCUP = Off 0 10 70 MT (ch.2) 60 50 CT (ch.1) 40 CT (ch.2) 30 100 1k 50 CT (ch.1) 40 VCC = 2.4 V f = 1 kHz RL = 16 Ω Both ch. input Rg = 10 kΩ A-curve filter 30 10 0 10 40 STB = VCC Mute = 0 V ALC = Off BST = Off ATT = Off CCUP = Off CT (ch.2) 30 20 10 0 1 000 100 Input voltage VIN (mV) RR VCC VTH-STB VCC Standby thereshold voltage VTH-STB (V) Ripple rejection ratio RR (dB) 50 20 80 RR (ch.1), RR(ch.2) 75 70 Vr = −20 dBV fr = 100 Hz THD = 10% RL = 16 Ω Both ch. input Rg = 10 kΩ A-curve filter 65 60 1.5 2.0 2.5 STB = VCC Mute = 0 V ALC = Off BST = Off ATT = Off CCUP = Off 3.0 3.5 4.0 4.5 1.5 1 VIN = 0 mV RL = 16 Ω Rg = 10 kΩ Mute = 0 V ALC = Off BST = Off ATT = Off CCUP = Off 0.5 0 1.0 5.0 1.5 2.0 2.5 3.0 3.5 4.0 Power supply voltage VCC (V) Power supply voltage VCC (V) VTH-MUTE VCC VTH-ALC , VTH-BST VCC 2 4.5 5.0 2.0 VIN = 0 mV RL = 16 Ω Rg = 10 kΩ STB = VCC ALC = Off BST = Off ATT = Off CCUP = Off 1.5 1 0.5 1.5 2.0 2.5 3.0 3.5 4.0 4.5 ALC thereshold voltage VTH-ALC (V) Mute thereshold voltage VTH-MUTE (V) 60 2 55 2 VIN = 0 mV STB = VCC RL = 16 Ω Mute = 0 V Rg = 10 kΩ ATT = Off CCUP = Off 1.5 1.5 VTH-ALC 1.0 1 0.5 0.0 1.0 5.0 Power supply voltage VCC (V) 6 70 60 Frequency f (Hz) 85 0 1.0 70 10 90 50 1.0 80 MT (ch.1) 20 0 100k 10k 90 MT (ch.2) 0.5 VTH-BST 0 1.5 2.0 2.5 3.0 3.5 4.0 Power supply voltage VCC (V) SDC00038CEB 4.5 5.0 BST thereshold voltage VTH-BST (V) 70 MT (ch.1) 100 Mute effective MT (dB) 100 Channel crosstalk CT (dB) 100 Mute effective MT (dB) Channel crosstalk CT (dB) CT, MT frequency 100 AN7531SA ■ Application Notes (continued) 2. Main characteristics (continued) VTH-CCUP , VTH-ATT VCC 2 VIN = 0 mV RL = 16 Ω Rg = 10 kΩ STB = VCC Mute = 0 V ALC = Off BST = Off 3.5 3.0 2.5 ATT thereshold voltage VTH-ATT (V) CCUP thereshold voltage VTH-CCUP (V) 4.0 1.5 VTH-CCUP 2.0 1 1.5 VTH-ATT 1.0 0.5 0.5 0.0 1.0 0 1.5 2.0 2.5 3.0 3.5 4.0 5.0 4.5 Power supply voltage VCC (V) ■ Application Circuit Examples 1. Center output method (without output capacitor) 1) At bass boosting Beep On Off Standby SW Mute SW ATT SW Beep SP2 SP1 VCC SDC00038CEB 10 11 0.1 µF On Off ALC 22 µF 16 Ω 9 8 7 6 4 3 5 1 µF 16 Ω 12 ALC det. 10 µF 0.068 µF 2 1 13 14 15 16 10 kΩ C-amp. SW 2.2 µF ATT 10 kΩ 17 19 20 21 Bias In1 On 10 µF 22 47 kΩ 23 0.068 µF 24 BST SW In2 Off Off On 18 0.22 µF 22 µF Standby Mute BST Off On 7 AN7531SA ■ Application Circuit Examples (continued) 1. Center output method (without output capacitor) (continued) Beep On Off On Standby SW Mute SW 13 14 10 kΩ ATT SW Beep ALC det. VCC 16 Ω SP2 SP1 12 11 10 0.1 µF On Off ALC 22 µF 16 Ω 9 8 7 6 5 1 µF 4 3 2 C-amp. SW 1 ATT 10 kΩ 15 18 0.22 µF 19 20 21 22 Bias In1 Off Off On 10 µF 23 24 BST SW In2 16 22 µF Standby Mute 17 2) No bass boosting 2. Output transformer less (OTL) (Output capacitors are necessary) Beep In1 On Off On Standby SW Mute SW ATT SW Beep SP2 SP1 SDC00038CEB 10 9 11 0.1 µF On Off ALC 22 µF 16 Ω 470 µF 8 7 1 µF 470 µF 6 16 Ω 12 ALC det. 5 4 10 µF 3 0.068 µF 2 2.2 µF 1 8 13 14 15 16 10 kΩ C-amp. SW VCC ATT 10 kΩ 17 19 20 Bias 21 BST SW In2 Off Off On 10 µF 22 47 kΩ 23 24 0.068 µF BST Off On 18 0.22 µF 22 µF Standby Mute AN7531SA ■ New Package Dimensions (Unit: mm) • SSOP024-P-0300E (Lead-free package) 7.80±0.30 (0.325) 13 +0.10 0.15-0.05 6.10±0.30 (1.00) 8.10±0.30 24 0° to 10° 0.65 Seating plane 0.10±0.10 (0.325) 12 0.22+0.10 -0.05 1.20±0.20 (0.50) 1 SDC00038CEB Seating plane 9 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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