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Part: BA7726AS
Category:
Multimedia
Description:
Company: ROHM Electronics
Datasheet: Download BA7726AS datasheet File size : 124 kB
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Datasheet text preview:
Multimedia ICs
Analog compander with vocal fader for KARAOKE
BA7726AS / BA7726AFS
The BA7726AS and BA7726AFS are analog companders for karaoke echo systems and have internal logarithmic compression and expansion circuits, a stereo line mixer amplifier, vocal fader function, vocal detection function, microphone ALC, microphone ON / OFF switch, and output switch. When used together with the BU9252 8-bit digital delay, these ICs form a high-grade karaoke echo system with minimum components. tio ·oArpapblilceaCDns with karaoke functions, VCRs, mini component stereo systems, LD players Pt stereos
·)FIeaetunresl stereo line mixer amplifier, allowing selec1 nt r a
tion of through output, left output, or right output. 2) Internal vocal elimination function, suitable for vocal faders and left and right output. 3) Echo level and loop ratio are DC-adjustable with the internal electronic volume control (EVR).
4) Internal microphone ON / OFF switch. 5) Vocal detection. 6) Internal microphone ALC function. 7) Internal anti-popping circuit.
·Absolute maximum ratings (Ta = 25°C)
Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 14 BA7726AS BA7726AFS 1250
1
Unit V 8502 mW °C °C
10 ~ + 70 55 ~ + 125
1 Reduced by 12.5mW for each increase in Ta of 1°C over 25°C. 2 Reduced by 8.5mW for each increase in Ta of 1°C over 25°C.
·Recommended operating conditions (Ta = 25°C)
Parameter Power supply voltage Symbol VCC Min. 4.5 Typ. 9.0 Max. 12.0 Unit V
1
·Block diagram
2
32 1 31 2 30 3 4 28 5 ALC 6 SW 7 8 9 10 GND 11 ECHO LEVEL CTRL 12 LOOP GAIN CTRL 13 EXP DET 14 EXP DET CT 15 EXP BF IN 16 DLY BF OUT
+
LINE OUT R
L / ST / R CTRL
Multimedia ICs
OUTSW NO / VC CTRL
LINE OUT L
L / VF / R CTRL
VO DET
29
VOCAL DET
MUTE CTRL
VO DET LEVEL
LINE IN R
ALC DET LEVEL
27
LINE IN L
ALC DET
26
VR
VF LPF1
MIC AMP IN VOCAL FADER
25
VF LPF2
MIC AMP NF
+
24
VF LPF3
BIAS
23 22
VCC
COMPRESS
VR VR EXPAND
CMP DET
21 20 19
CMP DET CT
CMP OUT
CMP BF NF IN
+
BA7726AS / BA7726AFS
18 17
CMP BF OUT
DLY BF NF IN
Multimedia ICs
BA7726AS / BA7726AFS
·Pin descriptions
Pin No. 2, 1 3 4 6, 5 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Pin name LINE OUT L / R L / VF / R CTRL MUTE CTRL LINE IN L / R VF LPF1 VF LPF2 VF LPF3 GND Line output (L, R) Line output switching (LEFT / VOCAL FADER / RIGHT) Line mute control input Line input (L, R) Vocal fader mode LPF capacitor Vocal fader mode LPF capacitor Vocal fader mode LPF capacitor Ground Function Voltage 4.5V 2.5V -- 4.5V 4.5V 4.5V 4.5V 0.0V -- -- 4.5V -- 4.5V 4.5V 4.5V 4.5V 4.5V 4.5V -- 4.5V 9.0V 4.5V 4.5V 4.5V -- -- -- -- -- 2.5V Pin type EF (P - P)
100k 23.5k 70.5k EF (NPN), 15k --
ECHO LEVEL CTRL Microphone off (ground to 0.1Vcc) / echo level adjustment (0.2Vcc to Vcc) LOOP GAIN CTRL EXP DET EXP DET CT EXP BF IN DLY BF OUT DLY BF NF IN CMP BF OUT CMP BF NF IN CMP OUT CMP DET CT CMP DET VCC BIAS MIC AMP NF MIC AMP IN ALC DET ALC DET LEVEL VO DET LEVEL VO DET NO / VC CTRL L / ST / R CTRL Loop attenuation ratio setting Expand detection wave Expand attack / recovery time setting Attack R = 5.6k , recovery R = 85.6k BF input LPF BF output (EXP) LPF BF negative feedback input (EXP) LPF BF output (CMP) LPF BF negative feedback input (CMP) Compression output Compression attack / recover time setting Attack R = 5.6k, recovery R = 85.6k Compression detection wave VCC Bias and capacitor for ripple rejection Microphone amplifier negative feedback Microphone amplifier input ALC attack / recovery time setting ALC level setting Microphone amplifier input detection level setting Microphone amplifier input detection attack / recover time setting Line output switching (NORMAL / VOCAL CUT) Line output switching (LEFT / STEREO / RIGHT)
50k -- B (NPN) EF (NPN) B (NPN) EF (P - P) B (NPN) EF (NPN) -- 60k -- 23.5k 2k 100k 220 B (PNP) B (PNP) 1k
Note: Pin type EF: emitter follower, P-P: push-pull, B: base For pins marked with an asterisk (), refer to Input and output equivalent circuit. All figures are designed values based on the measurement circuit in Fig. 1 (where Vcc = 9.0V), and are not guaranteed standards.
3
Multimedia ICs
BA7726AS / BA7726AFS
·Input / output circuits
L / VF / R CTRL
VCC VCC
MUTE CTRL
39k 3.3V
39k
1.7V 4
39k 2.5V 150k
3
ECHO LEVEL CTRL
LOOP GAIN CTRL
VCC 12 85k 11 39k 39k 0.6 × VCC 0.8 × VCC 0.8 × VCC 15k 0.6 × VCC
NO / VC CTRL
L / ST / R CTRL
VCC VCC 49.5k 39k
31 3.3V 33k
39k
39k
1.7V
32
All figures are designed values, and are not guaranteed standards.
4
Multimedia ICs
BA7726AS / BA7726AFS
·Electrical characteristics (unless otherwise noted, Ta = 25°C, Vcc = 9.0V)
Parameter Supply current Symbol I CC Min. 5.5 Typ. 8.4 Max. 12.7 Unit mA No input Conditions
LINE THROUGH INPUT : LINE IN, OUTPUT : LINE OUT
Line through output level Line through output distortion Line through max. output level Line through noise level Interchannel crosstalk V OLL THDLL V OMLL V ONLL CTLL 9.0 -- + 7.8 -- -- 8.0 0.026 + 10.0 100 85 7.0 0.2 -- 85 -- dBV % dBV dBV dBV VIN = 20.0dBV VIN = 20.0dBV1 MIC OFF (VECHO = 0.1 × VCC) THD = 1%1 No input, Rg = 1k2 MIC OFF (VECHO = 0.1 × VCC) VIN 12dBV, Rg = 1k2 MIC OFF (VECHO = 0.1 × VCC) VIN = 12dBV, Rg = 1k2 MIC OFF (VECHO = 0.1 × VCC) MUTE (VMUTE = H)
Mute level
MT
--
100
85
dBV
VOCAL CUT MODE INPUT : LINE IN, OUTPUT : LINE OUT
Through mode output level Vocal suppression ratio 1 Vocal suppression ratio 2 VOLLV VOLL1 VOLL2 1.0 1.0 -- 0.0 0.0 35 + 1.0 + 1.0 28 dBV dB dB VIN = 12dBV VIN = 12dBV (single ch. in.),VOCAL FADER (VLSTR = H, VLVFR = OPEN, VNOVC = OPEN) VIN = 12dBV (dual ch.in.),VOCAL FADER (VLSTR = H, VLVFR = OPEN, VNOVC = OPEN)
MIC THROUGH INPUT : MIC AMP IN, OUTPUT : LINE OUT
Microphone through output level Microphone through equivalent input noise Microphone input crosstalk ALC level VOML VONML CTML VOAML 9.9 -- -- + 5.1 8.4 117 92 + 6.6 6.9 102 77 + 8.1 dBV dBV dBV dBV VIN = 38dBV Rg = 1k2 VIN = 30dBV2 MIC OFF (VECHO = 0.1 × VCC) V28 = 2.9V
COMPRESS INPUT : MIC AMP IN, OUTPUT : CMP BF OUT
Compress output level Compress characteristics VOMC CMP 5.5 -- 3.5 + 5.2 1.5 -- dBV dB VIN = 38dBV VIN = 43dBV 33dBV Output level differential
EXPAND INPUT : DLY BF IN, OUTPUT : LINE OUT
Expand output level Expand characteristics Echo EVR attenuation ratio VODL EXP VODL 9.4 -- -- 7.4 + 19.4 50 -- -- 40 dBV dB dB VIN = 4dBV VIN = 9dBV + 1dBV, Output level differential VIN = 4dBV and when VIN = Vodl ECHO LEVEL = Min. (VECHO = 0.2 × VCC)
Loop INPUT : DLY BF IN, OUTPUT : CMP BF OUT
Loop output level Loop EVR attenuation ratio VODC VODC 4.4 -- 2.4 29 -- -- dBV dB VIN = 4dBV VIN = 4dBV and when VIN = Vodc LOOP GAIN = Min. (VLOOP = 0.2 × VCC)
1
Unless otherwise noted, mode settings are as follows. MUTE (VMUTE = GND), STEREO (VNOVC = GND, VLSTR = OPEN, VLVFR = OPEN) ECHO LEVEL = Max. (VECHO = VCC), LOOP GAIN = Max. (VLOOP = VCC) Signal frequency : 1kHz,
2
1 : B.W. = 0.4 ~ 30kHz, 2 : DIN
AUDIO
All parameters conform to the Measurement circuit diagram.
5
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