ICs for Audio Common Use AN7535NSA Headphone amplifier IC for portable equipment Unit : mm 12 0.525±0.1 (0.5) (0.325) • Output coupling capacitor is not required (Center amplifier method) • Built-in line amplifiers • Built-in headphone amplifier gain change-over circuit (8 dB/12 dB) • Built-in mute circuit • Built-in beep circuit • Built-in circuit against a shock noise generated when power supply is momentary cut off. 0.65 +0.1 0.22−0.05 0.525±0.1 ■ Features 0.1±0.1 1 1.2±0.2 13 6.1±0.3 24 0.15 The AN7535NSA is an audio signal processing IC in which line amplifiers 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. 8.1±0.3 7.8±0.3 ■ Overview Seating plane Seating plane SSOP024-P-0300B ■ Applications • Potable CD and MD players, etc. 17 16 15 14 13 9 10 11 12 1 18 7 8/12 dB 1 19 6 8 20 Beep 5 21 VREF 8/12 dB Mute 22 23 24 ■ Block Diagram 4 3 2 1 Ripple Filter 1 AN7535NSA ICs for Audio Common Use ■ Pin Descriptions Pin No. Description Pin No. Description 1 VCC1 13 Line amplifier ch.2 NF pin 2 Ripple filter 14 Line amplifier ch.2 input pin 3 Supply voltage 15 Headphone amplifier ch.2 input pin 4 Headphone amplifier ch.1 output pin 16 Headphone amplifier ch.1 input pin 5 N.C. 17 Line amplifier ch.1 input pin 6 Center amplifier output pin 18 Line amplifier ch.1 NF pin 7 Output GND 19 Input GND 8 Headphone amplifier ch.2 output pin 20 Headphone amplifier gain change-over pin 9 Line amplifier ch.1 output pin 21 Beep input pin 10 Line amplifier supply voltage 22 Internal reference voltage 11 Line amplifier ch.2 output pin 23 Mute pin 12 N.C. 24 Mute time-constant ■ Absolute maximum ratings Parameter voltage*2 Supply Line amplifier supply voltage*2 Symbol Rating Unit VCC 7 V VCC-LINE 7 V ICC 200.0 mA ICC-LINE 20.0 mA PD 370 mW Topr −20 to + 75 °C Tstg −55 to + 150 °C Supply current Line amplifier supply current Power dissipation*3 Operating ambient Storage Notes) temperature*1 temperature*1 *1 *2 *3 *4 : : : : All items are at Ta = 25°C, except for the operating ambient temperature and storage temperature parameters . Without signal Ta = 75°C when mounted on the recommended printed circuit board (Glass epoxy board 50 mm × 50 mm × t0.8 mm) Use under the condition of VCC-LINE ≥ VCC ■ Recommended Operating Range Parameter Supply voltage*1 Symbol Range Unit VCC 1.8 to 3.4 V VCC-LINE 1.8 to 3.4 V (VCC to VCC + 0.2) 2 ICs for Audio Common Use AN7535NSA ■ Electrical Characteristics Unless otherwise specially specified, VCC = 2.6 V, VCC-LINE = 2.8 V, f = 1 kHz, RL = 16 Ω (HP out), RL = 10 kΩ (line out), Ta = 25°C Parameter Symbol Conditions Min Typ Max Unit Quiescent current 1 ICQM Mute-on 0.7 1.9 3.0 mA Quiescent current 2 ICQ1 Without input, pin 3 current, Mute-off 2.2 4.3 8.8 mA Quiescent current 3 ICQ2 Without input, pin 10 current, Mute-off 0.4 1.1 2.0 mA Voltage gain 1 GV1 VO = 0.35 V[rms], GV = 12 dB 10.0 11.7 13.0 dB Voltage gain 2 GV2 VO = 0.35 V[rms], GV = 8 dB 6.0 7.8 9.0 dB Channel balance CB VO = 0.35 V[rms], GV = 8 dB −1 0 1 dB Total harmonic distortion THD VO = 0.35 V[rms], GV = 8 dB 0.05 0.2 % Maximum output power PO THD = 10%, GV = 8 dB 20 44 mW VNO Rg = 10 kΩ, GV = 8 dB −102 −93 dBm CT VO = 0.35 V[rms], GV = 8 dB 40 45 dB RR VR = 0.1 V[rms], fR = 100 Hz, GV = 8 dB 60 77 dB VMUTE VIN = −15 dBm, GV = 8 dB 70 98 dB VBEEP VIN = 2.2 dBm, GV = 8 dB 5 10 15 mV[p-p] HP amplifier Output noise voltage Channel *1 cross-talk*2 Ripple rejection *2 Mute attenuation Beep sound output voltage*3 Line amplifier Voltage gain Total harmonic distortion Channel cross-talk Output noise voltage *1 GV L VIN = −6 dBm 5.0 6.0 7.0 dB THDL VIN = −6 dBm 0.003 0.02 % CTL VIN = −6 dBm 85 95 dB VNO L Rg = 10 kΩ −104 −98 dBm VIN = −15 dBm 70 80 dB attenuation*2 VMUTE L Mute operating voltage VMON Pin 23 voltage for mute operation 0.5 V Mute release voltage VMOFF Pin 23 voltage for mute release 2.2 V Gain change-over operating voltage VGCON Pin 20 voltage for voltage gain 10.9 dB to 13.9 dB 0.5 V Gain change-over Off voltage VGCOFF Pin 20 voltage for voltage gain 6.9 dB to 9.9 dB 2.2 V Mute Note) *1 : Using A curve filter *2 : Using 30 kHz LPF *3 : The specifications are guaranteed under the both mute on/off conditions. 3 AN7535NSA ICs for Audio Common Use ■ Electrical Characteristics (continued) Unless otherwise specially specified, VCC = 2.6 V, VCC-LINE = 2.8 V, f = 1 kHz, RL = 16 Ω (HP out), RL = 10 kΩ (line out), Ta = 25°C • Design reference data Note) The following characteristics are the reference values for design and not guaranteed values. Parameter Symbol Conditions Min Typ Max Unit Quiescent current 1 ICQM Mute-on 1.9 mA Quiescent current 2 ICQ1 Without input, pin 3 current, Mute-off 4.6 mA Quiescent current 3 I CQ2 Without input, pin10 current, Mute-off 1.1 mA Voltage gain 1 GV1 VO = 0.35 V[rms], GV = 12 dB 11.7 dB Voltage gain 2 GV2 VO = 0.35 V[rms], GV = 8 dB 7.8 dB Channel balance CB VO = 0.35 V[rms], GV = 8 dB 0 dB Total harmonic distortion THD VO = 0.35 V[rms], GV = 8 dB 0.05 % Maximum output power PO THD = 10%, GV = 8 dB 52 mW VNO Rg = 10 kΩ, GV = 8 dB −102 dBm CT VO = 0.35 V[rms], GV = 8 dB 45 dB RR VR = 0.1 V[rms], fR = 100 Hz, GV = 8 dB 77 dB VMUTE VIN = −15 dBm, GV = 8 dB 98 dB VBEEP VIN = 2.2 dBm, GV = 8 dB 10 mV[p-p] GV L VIN = −6 dBm 6.0 dB THDL VIN = −6 dBm 0.003 % CTL VIN = −6 dBm 95 dB VNO L Rg = 10 kΩ −104 dBm VIN = −15 dBm 80 dB HP amplifier Output noise Channel voltage*1 cross-talk*2 Ripple rejection Mute attenuation*2 Beep sound output voltage*3 Line amplifier Voltage gain Total harmonic distortion Channel cross-talk Output noise Mute Notes) 4 voltage*1 attenuation*2 VMUTE L *1 : Using A curve filter *2 : Using 30 kHz LPF *3 : Under the both mute on and off conditions ICs for Audio Common Use AN7535NSA ■ Terminal Equivalent Circuits Pin No. 1 Equivalent circuit Description 3 50 kΩ DC (V) VCC1 Internally stabilized power supply 2.4 Ripple filter Internally stabilized power supply 2.17 VCC Headphone amplifier side supply voltage 2.6 Headphone amplifier ch.1 output pin 1.1 N.C. Headphone amplifier center output pin 1.1 2 2 1 Internal circuit 10 kΩ 100 kΩ 250 kΩ 3 4 3 16 14.4 kΩ 4 21.8 kΩ 14.4 kΩ VREF R = 1.1 V 7 5 6 3 1.5 kΩ 6 3 kΩ 2 kΩ VREF C = 1.1 V 7 7 8 Output GND Headphone amplifier ch.2 output pin 3 0 1.1 15 14.4 kΩ 8 21.8 kΩ 14.4 kΩ VREF L = 1.1 V 7 5 AN7535NSA ICs for Audio Common Use ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent circuit Description 9 DC(V) Line amplifier ch.1 output pin 1.4 Line amplifier supply voltage 2.8 Line amplifier ch.1 output pin 1.4 N.C. Line amplifier ch.2 NF pin RIN = 100 kΩ 1.4 Line amplifier ch.2 input pin RIN = 100 kΩ 1.4 Headphone amplifier ch.2 input pin RIN = 14.4 kΩ 1.1 Headphone amplifier ch.1 input pin RIN = 14.4 kΩ 1.1 10 9 350 µA 10 11 10 11 350 µA 12 13 14 20 µA 14 5 µA 13 15 15 50 µA 14.4 kΩ VREF L = 1.1 V 8 50 µA 250 Ω 16 16 50 µA VREF R = 1.1 V 6 50 µA 250 Ω 14.4 kΩ 4 ICs for Audio Common Use AN7535NSA ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent circuit Description 17 5 µA 18 19 20 1 100 kΩ 20 21 1.4 Line amplifier ch.1 NF pin RIN = 100 kΩ 1.4 18 20 µA 17 DC(V) Line amplifier ch.1 input pin RIN = 100 kΩ 100 kΩ 3 100 kΩ 100 kΩ 100 kΩ 21 22 3 VREF R 100 kΩ VREF C 22 100 kΩ 1 23 24 24 0 Headphone amplifier gain change-over pin GV = 8 dB mode V20 > V1 − 0.2 V GV = 12 dB mode V20 < 0.5 V RIN = 100 kΩ Beep input pin RIN = 100 kΩ Beep circuit operation when V21 < VCC − VBE Gain is fixed by internal circuit Internal reference voltage RIN = 100 kΩ Beep circuit operation when V21 < VCC − VBE Gain is fixed by internal circuit 1.2 Mute pin Mute-on V23 > V1 − 0.2 V Mute-off V23 < 0.5 V RIN = 100 kΩ VREF L 23 100 kΩ Input GND 100 kΩ 300 Ω 70 kΩ 330 kΩ Mute time constant Mute-on/off threshold value Mute-on V24 < VREF C = 1.2 V Mute-off V24 > VREF C = 1.2 V When Mute-on 0 When Mute-off 2.0 7 AN7535NSA ICs for Audio Common Use ■ Usage Notes 1. Use N.C. pin in open or grounded condition. 2. The output middle point of line amplifier is determined by the following equation ; Depending on the values of VCC and VCC-LINE, the middle point of line amplifier may shift from 1/2VCC-LINE. Use it by conducting a fine adjustment of R1 and R. 25 R1 · 1.1 · VO-DC = VCC 30 R1 + R2 1 R2 Line amplifier reference voltage R1 3. It is recommended that the VCC (pin 3) should be used at the same potential of the VCC-LINE (pin 10), or 0.2 V lower than the potential of VCC-LINE (pin 10). ■ Technical Information • PD Ta curves of SSOP024-P-0300B PD T a 1 000 900 Power dissipation PD (mW) 800 Glass epoxy board (50 × 50 × t0.8 mm) Rth(j-a) = 135.1°C/W PD = 740 mW(25°C) 740 700 600 500 400 390 300 200 Independent IC without heat sink Rth(j-a) = 256.4°C/W PD = 390 mW(25°C) 100 0 0 25 50 75 100 Ambient temperature Ta (°C) 8 125 ICs for Audio Common Use AN7535NSA ■ Application Circuit Example 68 kΩ 47 kΩ 33 µF 33 µF 13 N.C. 12 14 11 15 0.47 µF RL= 16 Ω HP out1 HP out2 Line amp.1 output 4.7 µF RL= 16 Ω 4.7 µF 1Ω 1Ω 10 16 17 8 9 1 18 1 19 6 7 0.47 µF 20 5 N.C. 0.47 µF 21 4 4.7 kΩ 1Ω 22 3 0.1 µF 220 µF 1 µF 0.1 µF 10 µF 23 2 10 µF 24 1 1 µF 1 µF 2.8 V 10 kΩ Line amp.2 output 220 µF 2.6 V 1 µF 10 kΩ 68 kΩ 47 kΩ 4.7 kΩ 10 µF HP amp. gain SW HP amp.1 HP amp.2 Line amp.2 in in in 10 kΩ 10 kΩ Beep Mute 10 µF Line amp.1 in 9