AN618

s Overview The AN6182K and AN6182S are recording and playing amplifier ICs for answering telephones. They incorporate an ALC circuit, recording and playing amplifiers, a loudspeaker amplifier, and a VOX circuit. 21.7±0.3 Recording and playing amplifier IC for answering telephones 1 2 3 4 5 6 7 8 9 10 11 12 6.2±0.3 24 23 22 21 20 19 18 17 16 15 14 13 1.1±0.25 3.05±0.25 4.7±0.25 s Features • Incorporates recording and playing amplifiers. • Incorporates a loudspeaker amplifier. • Incorporates a VOX circuit. • Incorporates a magnetic-head circuit to provide for one-tape cassette recording. • Incorporates 4 control circuits. 3—15˚ 7.62±0.25 0.30 – 0.05 + 0.1 SDIP package with 24 pins (SDIP024-P-0300) AN6182S 0.45 Unit : mm 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 2.0±0.2 0.6±0.3 0.1±0.1 1.27 0.3 7.2±0.3 9.4±0.3 SOP package with 24 pins (SOP024-P-0375) s Block Diagram PRE GND 24 PRE VCC 23 22 21 20 19 18 17 16 15 14 – 13 PRE ALC Vcc ALC ALC REC DET MIC LIN Pre Amp. + – VOX DET Vref + SP LOGIC Com 0.925 0.15 EQ – REG SPMUTE PREMUTE MIC LIN 8 PLAY REC 9 10 11 12 1 2 3 4 5 6 7 Power VCC Power GND 15.3±0.3 + 1.778 0.5±0.1 0.9±0.25 AN6182K, AN6182S AN6182K Unit : mm + s Absolute Maximum Ratings (Ta=25˚C) Parameter Supply voltage Supply current Note 1) Note 1) Symbol VCC ICC AN6182K AN6182S AN6182K AN6182S PD Topr Tstg Rating 9.0 600 700 338 –20 to + 75 –55 to + 150 –55 to + 125 Unit V mA mW mW ˚C ˚C ˚C Power dissipation Note 2) Operating ambient temperature Storage temperature Note 1) The IC must be used under the condition VCC × ICC < PD. Note 2) Ta=60˚C s Operating Supply Voltage Range Parameter Operating supply voltage range Symbol VCC Range 4.5 to 9.6V s Electrical Characteristics Parameter MIC preamp. gain MIC preamp. ALC output MIC preamp. output noise voltage LIN preamp. gain LIN preamp. ALC output LIN preamp. output noise voltage VOX sensitivity (1) VOX sensitivity (2) REC head drive PRAY/EQ amp. gain PRAY/EQ amp. output noise voltage POWER amp. gain POWER amp. max output voltage POWER amp. output noise voltage Pre. VCC voltage ∆PRE VCC voltage Total circuit current (1) Total circuit current (2) Symbol GV VO Vno GV VO Vno VS1 VS2 GV GV Vno GV VO Vno VCC VCC Itotal-1 Itotal-2 Condition Vi=–64dBm Vi=–30dBm DIN/AUDIO, Rg=10kΩ Vi=–64dBm Vi=–30dBm DIN/AUDIO, Rg=10kΩ Vi=–35dBm Vi=–29dBm Rg=1kΩ, Vi=–10dBm Vi=–60dBm DIN/AUDIO, Rg=10kΩ Vi=–20dBm RL=8Ω, THD=5% DIN/AUDIO, Rg=10kΩ No signal, VCC=5V No signal, VCC=5V ICC (Pre) =0 to 6mA No signal recording mode (SP ON) No signal recording mode (SP OFF) 3.6 – 0.25 12 2 14.5 100 –18.7 39.5 3.5 48.5 –11 min 48.5 –11 typ 50.5 –9 1.2 50.5 –9 1.2 4.8 0.025 –16.2 41.5 0.3 17 200 0.2 4.0 – 0.07 20 3.3 4.4 0.1 30 5 0.5 –13.7 43.5 19.5 max 52.5 –7 52.5 –7 Unit dB dBm dB dBm V V dBm dB dB mW 1.0 mVrms V V mA mA 2.5 mVrms 2.5 mVrms 1.2 mVrms s Pin Descriptions Pin No. 1 2 Symbol Power VCC Power out Description Loudspeaker amplifier power supply input An external power supply connects to this pin. The input supply voltage range is 4.5 to 9V. Loudspeaker amplifier output This pin connects through an electrolytic capacitor to a loudspeaker with a load impedance of 8Ω or more. This pin is effective only when Pin6 is high. Loudspeaker amplifier ground This pin connects to an external ground. This ground should be separated from that of the preamplifier circuits. Loudspeaker amplifier inverse input A combination of resistors and a capacitor connected between this pin and Pin2 and the ground determines the gain and frequency characteristics of the loudspeaker amplifier. Loudspeaker amplifier non-inverse input Signals should be input to this pin through a capacitor. The expected input impedance is typically 27kΩ. Loudspeaker amplifier mute control If the voltage level at this pin is high, the loudspeaker amplifier turns ON, and if low, turns OFF. Preamplifier mute control If the voltage level at this pin is high, the preamplifier turns OFF, thereby blocking the MIC and line preamplifier outputs. If the voltage is low, the preamplifier turns ON. Even if the preamplifier is turned OFF (mute ON), signals input to Pin9 are output from Pin18. MIC/line preamplifier switching If the input to Pin7 is low and the input to this pin is high, then the line preamplifier turns ON and the MIC preamplifier turns OFF. If the input to Pin7 is low and the input to this pin is low, then the line preamplifier turns OFF and the MIC preamplifier turns ON. REC/PLAY switching If the input to this pin is high, the recording amplifier turns OFF, and the play equalizer amplifier turns ON. If low, the recording amplifier turns ON, and the play equalizer amplifier turns OFF. VOX output The VOX detection signal is output from this pin. This pin should be connected through a resistor (100-200kΩ) to the power supply. VOX detection control This pin should be connected through a resistor (10 to 470kΩ) and a capacitor in parallel to the ground. The resistance determines the sensitivity of VOX detection. Internal reference supply voltage output This pin should be grounded through a 100µF capacitor. Equalizer amplifier output Amplified play signals from the head are output from this pin. A resistor and capacitors connected between this pin and Pin14 determine the equalizer characteristics. Equalizer amplifier inverse input This pin connects through a resistor to Pin13 to determine the equalizer characteristics. The expected input impedance is typically 10kΩ. To the REC/PLAY head A REC/PLAY head must be connected between this pin and the ground. Switching of REC and PLAY modes is done by Pin9. A load resistor should be connected between this pin and the ground because the input impedance becomes high (several hundred kilohms) in the PLAY mode. REC gain control A resistance connected between this pin and the ground determines the head bias current in the REC mode. The lower the resistance, the higher the current. A serial combination of a resistance and a capacitance, connected in parallel with the resistance, determines the REC gain. VOX amplifier input The preamplifier output at Pin18 must be connected through a resistor and a capacitor to this pin. The impedance between Pin18 and this pin determines the gain, and a resistance betweeen Pin11 and the ground determines the frequency characteristics of the VOX amplifier. Preamplifier output Amplified MIC/line preamplifier outputs are output from this pin depending on the the statuses of Pin7 (preamplifier mute) and Pin8 (MIC/line switching). Preamplifier inverse input Resistors and a capacitor connected between this pin and Pin18 and 12 determine the preamplifier gain. The input impedance at this pin is several hundred kilohms. ALC detection control A 240kΩ resistor and a 4.7µF capacitor connected in parallel between this pin and the ground control ALC detection sensitivity. 3 Power GND 4 5 6 Power NF Power in SP mute control 7 Preamp. mute control 8 MIC/LIN control 9 REC/PLAY control 10 VOX out 11 12 13 VOX DET VREF EQ–amp. out 14 EQ–amp. NF 15 Head in/out 16 REC ADJ 17 VOX in 18 Pre out 19 20 Pre NF ALC DET s Pin Descriptions (cont.) Pin No. 21 Symbol LIN in Description Line preamplifier input Line receiver signals are input through a capacitor and a resistor to this pin, and then amplified to be output from Pin18. The statuses of Pins7 and 8 enable or disable the signals. The input impedance with ALC OFF is 10kΩ. MIC preamplifier input MIC signals are input through a capacitor and a resistor to this pin, and then amplified to be output from Pin18. The statuses of Pins7 and 8 enable or disable the signals. The input impedance with ALC OFF is 10kΩ. Preamplifier internal regulated supply voltage output This pin should be grounded through a 220µF capacitor. The output voltage is typically 4.2V. The output can be used as an ECM bias current source. Preamplifier ground This is the ground pin for the preamplifier circuits. 22 MIC in 23 24 PRE VCC PRE GND s Pin Descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 Description Loudspeaker amplifier power supply input Loudspeaker amplifier output Loudspeaker amplifier ground Loudspeaker amplifier inverse input Loudspeaker amplifier non-inverting input Loudspeaker amplifier mute control Preamplifier mute control MIC/line preamplifier switching REC/PLAY switching VOX output VOX detection control Internal reference supply voltage output Pin No. 13 14 15 16 17 18 19 20 21 22 23 24 Description Equalizer amplifier output Equalizer amplifier inverting input To the REC/PLAY head REC gain control VOX amplifier input Preamplifier output Preamplifier inverting input ALC detection control Line preamplifier input MIC preamplifier input Preamplifier internal regulated supply voltage output Preamplifier ground s Block Diagram Showing the Logic of Amplifies 19 18 16 15 13 22 REC MICREC Pre EQ 21 LINPRE 5 SP 4 2 6 7 8 9 1. Loudspeaker amplifier mute 6 SP MUTE H L 2. REC/PLAY switching 9 PLAY/REC H L 3. Preamplifiers switching 9 PRE AMP H L L H L iMIC/LIN MIC PRE AMP OFF OFF ON LIN PRE AMP OFF ON OFF REC OFF ON EQ ON OFF SP POWER ON OFF PLAY IN R9 1kΩ C11 10µF REC OUT PRE VCC MAC IN LIN IN + s Application Circuit C16 2.2 µF C15 0.015 µF C12 0.47µF C14 0.01 µF R12 9.1kΩ R11 15kΩ + + C19 0.68 µF C18 0.68 µF R15 R14 1kΩ 30kΩ PRE OUT + C13 0.033 µF 4.7 kΩ R10 10kΩ C10 22 µF C20 100 µF + R18 47kΩ R17 47kΩ R13 100kΩ 19 18 17 R16 240 C17 kΩ 4.7µF 20 R8 200 kΩ R7 18 R4 kΩ 330 C9 kΩ 0.01 µF C8 660 pF EQ OUT 16 15 14 13 24 23 22 21 PRE VCC ALC ALC ALC DET REC MIC LIN – Pre + VOX DET + LOGIC SP Mute Pre Mute MIC LIN PLAY REC Com – SP 1 2 3 4 5 6 7 8 9 10 11 + C1 220 µF + C2 220µF SP OUT + C3 0.1µF + R2 10kΩ R1 51kΩ C4 0.1µF POWER VCC=4.5 to 9.0V R4 200 kΩ VR 10kΩ SPMUTE PRE MUTE LIN MIC Vcc SP IN C5 0.1µF PLAY REC VOX OUT R5 220 kΩ – + EQ + Vref REG 12 C6 + 0.1 µF C7 100 µF