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| Multimedia ICs Headphone / speaker amplifier BA7785FS The internal linear audio circuits of the BA7785FS include a stereo headphone amplifier, BTL monaural speaker amplifier, and an electronic volume circuit, making this IC ideal for LCD TVs and notebook computers. *Applications computers, and wordprocessors, LCD TVs, notebook etc. *Features stereo headphone amplifier that allows for 1) Internal mixed input, along with a BTL monaural speaker amplifier. 2) Internal anti-pop circuit, which prevents popping sounds when the power is turned on. 3) Internal electronic volume and mute circuit. 4) Low-voltage operation (3.3V). 5) Internal input switch that also allows for the input of computer beeps. *Absolute maximum ratings (Ta = 25C) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 18 750 - 10 ~ + 70 - 55 ~ + 125 Unit V mW C C Reduced by 7.5mW for each increase in Ta of 1C over 25C. When mounted on a 90 x 50 x 1.6mm glass epoxy board. *Recommended operating conditions (Ta = 25C) Parameter Power supply voltage Symbol SP / HP VCC Min. 3.0 Typ. -- Max. 6.0 Unit V 1 Multimedia ICs BA7785FS *Block diagram EVR CTRL 1 20 HP VCC 6dB LINE IN (L) 2 R VR HP Amp 19 HP OUT (L) MUTE CTRL 3 18 HP OUT (R) LINE IN (R) 4 R VR HP Amp 6dB 17 HP GND BIAS IN 5 R R 16 SP VCC MIX OUT 6 MIX Amp 6dB SP Amp INV 15 FILTER OUT (1) SP IN 1 7 14 SP OUT (1) SP SP IN 2 8 Amp 13 SP OUT (2) 6dB SP IN CTRL 9 12 FILTER OUT (2) SP ON / OFF 10 11 SP GND 2 Multimedia ICs BA7785FS *Pin descriptions Pin No. 1 2, 4 3 5 6 7, 8 9 10 11 12, 15 13, 14 16 17 19, 18 20 Pin name EVR CTRL LINE IN L, R MUTE CTRL BIAS IN MIX OUT SP IN 1, 2 SP IN CTRL SP ON / OFF SP GND FILTER OUT 1, 2 SP OUT 1, 2 SP VCC HP GND HP OUT L, R HP VCC Function EVR control input. Maximum gain at Vcc. Headphone input L, R ZIN = 30k Input for controlling the muting of headphone output Bias buffer input Output of the headphone output mixing amplifier Speaker inputs 1 and 2 Switched with SP IN CTRL (9pin) ZIN = 50k SP IN1 / SP IN2 input selection control Speaker on / off (power saving mode) control Speaker output ground Connecting the oscillation prevention capacitor BTL speaker outputs 1 and 2 Speaker output VCC Ground for the headphone, mixing amplifier, inputs and controls Headphone amplifier output VCC for the headphone, amplifier, mixing amplifier, inputs and controls Voltage -- 1 / 2VCC -- 1 / 2VCC 1 / 2VCC 1 / 2VCC -- -- GND 1 / 2VCC 1 / 2VCC VCC GND 1 / 2VCC VCC Type B (NPN) B (PNP) B (NPN) B (NPN) PP B (NPN) B (PNP) B (NPN) -- B (NPN) PP -- -- PP -- Note: Pin types: P-P = push-pull, B = base, C = collector. All figures are standard values. 3 Multimedia ICs BA7785FS *Input / output circuits EVR CTRL VCC MUTE CTRL 56k 1 47k 1 / 2VCC 3 50k 32k GND GND SP IN CTRL SP ON / OFF VCC 45k 50A 10 50k VCC 50k 9 45k 45k 2k GND 45k GND 4 Multimedia ICs BA7785FS *Electrical characteristics measurement conditions are as follows. * Unless otherwise noted, HP VCC = SP VCC = 5V Ta = 25C EVR control Mute control Speaker input control Speaker on / off control (EVR CTRL pin 1) (MUTE CTRL pin 3) (SP IN CTRL pin 9) (SP ON / OFF CTRL pin 10) : Max. (HP VCC) : LOW (MUTE OFF) : LOW (SP IN1) : HIGH (SP ON) Signal frequency = 1kHz HP amp: RL = 100 SP amp: RL = 8, BTL = operating 1: DIN AUDIO 2: IHF A Parameter Supply current Supply current power save Symbol I Ips Min. 7.8 3.5 Typ. 12.0 5.4 Max. 18.5 8.3 Unit mA mA No input Conditions No input, SP ON / OFF: L [HP Amp] INPUT: LINE IN L / R, OUTPUT: HP OUT L / R Output voltage level Channel balance EVR range Distortion Maximum rated output voltage Output residual noise Interchannel crosstalk Muting level VOHP CBHP GEVR THDHP HHP VONHP CTHP MTHP - 5.0 - 1.0 70.0 -- 8.0 -- -- -- - 3.5 0.0 88.0 0.3 10.0 - 81.0 - 78.0 - 95.0 - 2.0 1.0 -- 1.0 -- - 73.0 - 70.0 - 84.0 dBV dB dB % mW dBV dBV dBV VIN = - 10.0dBV, VIN = - 10.0dBV, VIN = - 10.0dBV, EVR Max-Min difference VIN = - 10.0dBV, 1 VCC = 3.0V, THD = 10% Rg = 1k, 2 VIN = - 6.5dBV, 1 VIN = - 6.5dBV, 1 [MIX Amp] INPUT: LINE IN L / R, OUTPUT: MIX OUT Output level VOMIX - 15.5 - 13.5 - 11.5 dBV VIN = - 20.0dBV [SP Amp (BTL) ] INPUT: SP IN 1 / 2, OUTPUT: SP OUT 1 / 2, BTL measurement Speaker output level Distortion Maximum rated output power Residual output noise Speaker-off level VOSP THDSP PSP VONSP VOSPOFF - 0.25 -- 250 -- -- 1.25 0.6 300 - 98.0 - 108.0 2.75 1.5 -- - 90.0 - 85.0 dBV % mW dBV dBV VIN = - 10.0dBV VIN = - 10.0dBV, VCC = 3.0V, THD = 10% Rg = 1k, 2 VIN = - 7.0dBV, 1, when SP is off 5 Multimedia ICs Parameter [Control mode holding voltage] MUTE CTRL BA7785FS Symbol Min. Typ. Max. Unit Conditions Mute-off holding voltage Mute-on holding voltage SP IN CTRL VTH3L VTH3H 0.0 2.0 -- -- 0.5 VCC V V SP IN1 holding voltage SP IN2 holding voltage Speaker on / off control VTH9L VTH9H 0.0 2.2 -- -- 0.5 VCC V V Speaker-off holding voltage Speaker-on holding voltage VTH10L VTH10H 0 0.8VCC -- -- 0.2VCC VCC V V 6 HP VCC EVR CTRL 1 20 *Measurement circuit Multimedia ICs 6dB 47 19 HP OUT (L) A LINE IN (L) 2 VR HP Amp 1k 0.47 R 0.047 47 3 18 100 MUTE CTRL 0.047 10 HP OUT (R) 100 4 VR 17 LINE IN(R) 0.47 6dB SP VCC R R 16 1k R HP Amp HP GND 5 BIAS 4.7 Fig.1 6 MIX Amp 15 A 0.47 6dB 7 SP Amp 14 MIX OUT 10k 1500p SP OUT (1) SP IN 1 0.47 INV 1k 0.22 8 10 SP Amp 13 SP IN 2 8 1k 0.47 6dB SP IN CTRL 9 0.22 SP OUT (2) 12 1500p SP ON/OFF 10 11 SP GND BA7785FS 7 Multimedia ICs operation *Circuitpins Control * There are three control pins, described below. (1) Mute control (MUTE CTRL: pin 3) * Stops headphone output and mixing output. Mode MUTE OFF MUTE ON Control signal L H Mutes the line. Note -- BA7785FS Note: This pin should always be at the high level (muted) when the power is turned on or off. (2) Speaker input control (SP IN CTRL: pin 9) * Switches speaker input between SP IN1 and SP IN2. Mode SP IN1 SP IN2 Control signal L H Note -- -- (3) Power saving control (SP ON / SP OFF CTRL: pin 10) * Turns the speaker on and off. Mode SP OFF SP ON Control signal L H Note Power saving mode Normal speaker operation Power saving mode: The speaker amplifier is stopped. To begin output, pull up to bias at 50k. *Attached components temperature coefficient and Use capacitors with low low variation for oscillation prevention for pins 13, 14, 18 and 19 (0.47F and 0.1F), and for phase correction for pins 12 and 15 (1800pF). If capacitors with high variation or temperature coefficient are used (B characteristics, etc.), be sure to compensate with an according capacitance. Also use electrolytic capacitors for pins 5, 16 and 20 (among others) according to the characteristic changes caused by temperature change. *Operation notes supply voltage for HP VCC (pin 20) (1) Use the same and SP VCC (pin 16). Using different supply voltages could result in output voltage drops or circuit malfunctioning. (2) The common impedance of the two power lines for HP VCC (pin 20) and SP VCC (pin 16) should be as low as possible. A large common impedance could cause oscillation. 8 Multimedia ICs BA7785FS *External dimensions (Units: mm) 8.7 0.2 20 7.8 0.3 5.4 0.2 11 1 1.8 0.1 10 0.11 0.8 0.36 0.1 0.3Min. 0.15 SSOP-A20 0.15 0.1 9 |
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