ICs for Audio Common Use AN7384N Electronic Volume IC for Cassette Deck ■ Overview Unit : mm (1) L, R, independent volume (2) Coalition volume + L, R balance • Reference voltage source for control voltage built-in 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 2.54 21.7±0.3 ■ Features • High input dynamic range • Low output noise voltage • Capable of selecting two kinds of control mode 0.5±0.1 1.2±0.25 The AN7384N is a volume control IC for recording level adjustment of cassette deck and mini component stereo. 0.51min 6.3±0.25 3.8±0.25 + 0.1 (3.45) 5 0.3 – 0.0 3 ~ 15˚ 7.62±0.25 16-Lead DIP Package (DIP016-P-0300E) ■ Block Diagram VEE (SUB) 16 14 NC GND2 GND3 15 13 12 11 10 VREF Mode SW. 9 VCA VCA Control VCA Buf. 1 VCC 2 3 GND1 4 5 Buf. 6 7 8 ICs for Audio Common Use AN7384N ■ Absolute Maximum Ratings (Ta= 25˚C) Symbol Rating Supply Voltage Parameter VCC ±12 Unit V Supply Current ICC 30 mA mW Power Dissipation PD 800 Operating Ambient Temperature Topr –20 ~ + 70 ˚C Storage Temperature Tstg –55 ~ +150 ˚C ■ Recommended Operating Range (Ta = 25˚C) Parameter Symbol Range Operating Supply Voltage Range VCC ±7V ~ ±11V ■ Electrical Characteristics (VCC = ±10V, Ta = 25˚C) Parameter Symbol min. typ. max. ICC Vin= 0dBV, Volume mode, Vcont= Vref Negative Side Circuit Current IEE Vin= 0dBV, Volume mode, Vcont= Vref –20 –9.1 ATT – 1 *1 Vin= 0dBV, Volume mode, Vcont= Vref ATT – 2 *1 Vin= 0dBV, Volume mode, Vcont= 0V CB – 1 *1 Vin= 0dBV, Volume mode, Vcont= Vref –1 Attenuation – 1 Attenuation – 2 Channel Balance – 1 –2 Distortion Rate – 2 Noise Output Voltage – 1 Noise Output Voltage – 2 Channel Balance – 2 CB – 2 *1 Vin= 0dBV, Volume mode, at ATT= –20dB Max. Input Voltage Vi (max.)*1 VO (max.)*1 THD= 3%, ATT= –20dB Max. Output Voltage mA 0 1 dBV –85 –80 dBV mA 0 2 dB 0.05 0.1 % 0.15 0 % –106 –100 dBV –110 dBV –3 0 14.8 16 THD= 3%, Vcont= Vref Unit 20 12 THD – 1 **21 Vin= –20dBV, Volume mode, Vcont= Vref THD – 2 **21 Vin= 0dBV, Volume mode, at Vcont= –20dB Vno – 1 *1 Without input (Rg= 0Ω), Volume mode, Vcont= Vref, A curve Vno – 2 *1 Without input (Rg= 0Ω), Volume mode, Vcont= 0V, A curve Distortion Rate – 1 *1 *2 Condition Positive Side Circuit Current 3 dB dBV 1.5 dBV Control Voltage Range Vcont *1 0 Vref V Volume Mode Switching Voltage V10 (V) 0 1.5 V Balance Mode Switching Voltage V10 (B) 3.5 4.8 V Balance Mode Control Gain (Lch.) ATTBG Volume mode, Input –20dBV Vcont to Pin5, V7= 0.5Vref –22 –20 –18 dBV Balance Mode Channel Balance CB – 3 Volume mode, Input –20dBV Vcont to Pin5, V7 = 0.5Vref, L/R –3 0 3 dB 2-channel Filter of 18dB/oct should be used at measurement. ■ Characteristics Curve Independent Volume Mode Attenuation Characteristics Balance Mode Attenuation Characteristics 0 0 VREF VOut= 0dBV – 10 Vcont.1 – 20 – 20 Attenuation (dB) Attenuation (dB) – 30 SLO – 40 – 60 Vin = 0dB 1kHz VOut= – 20dBV – 40 VOut= – 40dBV – 50 – 60 – 70 VIN= 0dBV f= 1kHz – 80 – 80 – 90 (Without Enter) 0 1 2 3 Vcont (V) 4 5 0 1 2 3 Pinu V (V) 4 5 ICs for Audio Common Use AN7384N ■ Application Circuit VoutB B.P. 47µF 24kΩ 24kΩ + 47µF –10 (V) – 47µF VINB B.P. 16 15 14 Bal mode 13 VREF 11 12 Vol. mode 10 9 N.C. GND3 VEE (SUB) GND2 VREF Mode SW. VCA VCA Control VCA VCC Buf. 1 +10 (V) 47µF GND1 3 2 4 5 B.P. 47µF 24 47µF kΩ + – B.P. VINA 24kΩ Buf. 6 10kB B typ. 7 8 10kB B typ. VoutA 1. Voltage of Pin 7 becomes center at 1/2 VREF in case of using at balance mode. 2. Coupling capacitor of output can be excluded according to system specifications. ■ Pin Descriptions Description Pin No. Pin Name 1 Positive Side Power Supply Positive side supply voltage pin Input Pin Each channel input pin Pin2 – ch. A Pin15 – ch. B Impedance Equivalent Circuit 20µA 2 · 15 2 15 3 A-ch. GND A-ch. side VCA system GND pin 4 · 13 Output Pin Each channel output pin Pin4 – A-ch. Pin13 – B-ch. 5 A-ch. Control Voltage Input Control DC input pin · Pin11Low – A-ch. side independent control · Pin11Low – A, B-ch. balance control B-ch. Control Voltage Input Control DC input pin · Pin11High – B-ch. side independent control · Pin11High – A, B-ch. balance control 7 1.8kΩ 4 13 1.8kΩ 5 30µA ICs for Audio Common Use AN7384N ■ Pin Descriptions (Cont.) 6 Description Pin Name Pin No. A-ch. Control Voltage Output Equivalent Circuit Impedance Control DC voltage buffer output pin 6 8 B-ch. Control Voltage Output 9 NC 8 Control voltage buffer output input to Pin7 10 10 Volume Mode/Balance Mode Switching Control mode switching pin Low – independent volume control High – coalition volume balance control mode 11 Reference Voltage Output Reference voltage output pin Vref 2 11 12 GND Control system GND pin 14 B-ch. GND B-ch. side VCA system GND pin 16 Negative Side Power Supply Negative side supply pin Supplementary Explanation Electrical Caracteristics Design Reference Value Parameter Symbol CT Crosstalk Condition min. Vin = 0dBV, Vcont = Vref Control Voltage at –20dB Vcont1 Vin = 0dBV, Vout = –20dBV Attenuation Characteristics SLO Vin = 0dBV, Vcont.1 →Vcont.– 0.5V Vin = 0dBV, Vcont. = Vcont.1 →Vcont.– 0.5V typ. max. Unit – 85 – 80 1.8 2 2.2 V – 15.5 – 12 – 9.5 dB dBV Attenuation Characteristics Balance ATT–B – 1.4 0 1.4 dB The ratio of Vcont.1 to Vref ATT–V 0.25 0.4 0.55 dB Vref 4.8 5 5.2 V Control Power Supply Operation Mode and Control Pin Pin No. Volume Mode Balance Mode Mode 5 Volume Control Volume Control Volume Mode Control each channel independently Operation Description 7 Volume Control Balance Control Balance Mode Control volume at Pin5 simultaneously. Control right and left balance at Pin6 Note) Center at 1/2Vref Precautions on Use This IC is an integrated circuit for +, –2 power supply. When user use this IC at – power supply, making reference voltage outside with OP amp. is needed. As this IC is apt to be influenced by supply impedance, it needs capacitors of more than 47µF between VCC and GND, more than 47µF between VEE and GND.