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Part: BA7725FS
Category:
Multimedia
Description:
Company: ROHM Electronics
Datasheet: Download BA7725FS datasheet File size : 124 kB
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Datasheet text preview:
Multimedia ICs
Analog compander for KARAOKE echo systems
BA7725S / BA7725FS
The BA7725S and BA7725FS are analog companders designed for KARAOKE echo systems, and logarithmically compress the signal level by 1 / 2 and then logarithmically expand it by a factor of 2. These ICs can be used in combination with the BU9252S or BU9252F to create a digital echo system. These ICs have an internal line mixer amplifier for mixing line input and echo signals. The internal electronic volume control makes it possible to adjust the mixer level and loop level mixer with an external DC voltage. s ·iAcpupitliscationrequire analog signal compression and expansion Cr that
·)FIeaetunreslogarithmic 1 / 2 compression circuit and 2 × 1 nt r al
expansion circuit 2) Internal 2-channel buffer amplifier used as a tertiary low pass filter 3) Internal mixer amplifier that mixes line input and microphone input
4) Internal electronic volume control allows for adjustment of the echo mixer level and loop mixer level using an external DC voltage. 5) Internal microphone amplifier and microphone input ON / OFF switch
·Absolute maximum ratings (Ta = 25°C)
Parameter Power supply voltage Power dissipation BA7725S BA7725FS Symbol VCC Pd Tstg Topr Limits 13 10001 6002 55 ~ + 125 10 ~ + 70 Unit V mW °C °C
Storage temperature Operating temperature
1 Reduced by 10mW for each increase in Ta of 1°C over 25°C. 2 Reduced by 6.0mW for each increase in Ta of 1°C over 25°C.
·Recommended operating conditions
Parameter Power supply voltage Symbol VCC Limits 6.5 12.0 Unit V
1
Multimedia ICs
BA7725S / BA7725FS
·Block diagram
BA7725S
LINE OUT LINE IN N.C. ECHO LEV CTRL GND LOOP GAIN CTRL EXP DET EXP DET CT EXP BF OUT 1 2 3 4 5
VR + SW + VR +
COMPRESS
BA7725FS
22 MIC AMP IN 21 MIC AMP OUT 20 N.C. 19 VCC 18 RIPPLE FILTER 17 CMP DET 16 CMP DET CT 15 CMP OUT 14 CMP BF IN
BF BF
LINE OUT LINE IN ECHO LEV CTRL GND LOOP GAIN CTRL EXP DET EXP DET CT EXP BF OUT EXP BF IN
1 2 3 4 5 6 7 8
BF BF
20 MIC AMP IN
+ SW + VR VR +
COMPRESS
19 MIC AMP OUT 18 VCC 17 RIPPLE FILTER 16 CMP DET 15 CMP DET CT 14 CMP OUT 13 CMP BF IN 12 CMP BF OUT
BF
6 7 8 9
EXPAND
EXPAND
9
EXP BF IN 10 DLY BF OUT 11
BF
13 CMP BF OUT 12 DLY BF IN
DLY BF OUT 10
11 DLY BF IN
2
Multimedia ICs
BA7725S / BA7725FS
·Pin descriptions
Pin No. BA7725S 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 BA7725FS 1 2 -- 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 -- 19 20 Pin name LINE OUT LINE IN N.C. ECHO LEV CTRL GND LOOP GAIN CTRL EXP DET EXP DET CT EXP BF OUT EXP BF IN DLY BF OUT DLY BF IN CMP BF OUT CMP BF IN CMP OUT CMP DET CT CMP DET RIPPLE FITER VCC N.C. MIC AMP OUT MIC AMP IN Microphone amplifier output Microphone amplifier input Line output Line input -- Microphone turns off when voltage drops below 1V. Set echo signal damping ratio between 2-9V (Vcc = 9.0V). Ground Setting the loop damping ratio. Set between 2-9V (Vcc = 9.0V). Expand detection Setting expand attack / recovery time Attack (R) = 5.6k, recovery (R) = 85.6k LPF BF output (expansion) LPF BF input (expansion) Echo signal input BF output Echo signal input BF input LPF BF output (compression) LPF BF input (compression) Compression output Setting the compression attack / recovery time Attack (R) = 5.6k, recovery (R) = 85.6k Compression detection Attached ripple rejection capacitor VCC -- Function
3
Multimedia ICs
BA7725S / BA7725FS
·Input / output circuits
Pin name Pin No. Equivalent circuit
ECHO LEVEL CTRL
4
4
LOOP GAIN CTRL
6
6
Note: The BA7725FS is mounted on a 20-pin SSOP-A package with a different pin number than the BA7725S. On the BA7725FS, the ECHO LEVEL CTRL pin is pin 3, and the LOOP GAIN CTRL pin is pin 5.
4
Multimedia ICs
BA7725S / BA7725FS
·Electrical characteristics (unless otherwise noted, Ta = 25°C, Vcc = 9V)
Parameter Supply current Symbol ICC Min. 4.3 Typ. 5.7 Max. 7.6 Unit mA No input Conditions
LINE THROUGH INPUT : LINE IN, OUTPUT : LINE OUT
Line through output level Line through output distortion Line through maximum output level Line through noise level VOLL THDLL VOML VONL 9.0 -- + 5.0 -- 8.0 0.15 + 7.2 92 7.0 0.5 -- 77 dBV % dBV dBV VIN = 26.0dBV VIN = 26.0dBV, MIC OFF,1 THD = 1%,1 MIC OFF, Rg = 600,2
MIC THROUGH INPUT : MIC AMP IN, OUTPUT : LINE OUT
Microphone through output level Microphone through output distortion Microphone through input conversion noise Microphone through crosstalk VOML THDML VONM CTML 10.5 -- -- -- 8.5 0.2 114 91 6.5 0.5 104 75 dBV % dBV dBV VIN = 52dBV VIN = 52dBV,1 Input shorted VIN = 44dBV, MIC OFF,2
COMPRESS INPUT : MIC AMP IN, OUTPUT : CMP BF OUT
Compress output level Compress output distortion Compress noise level Compress characteristics VOMC THDMC VONC CMP 6.5 -- -- -- 4.5 0.5 55 11.0 2.5 2.0 45 -- dBV % dBV dB VIN = 52dBV VIN = 52dBV,1 Rg = 600,2 VIN = 42dBV 62dBV Output level differential
EXPAND INPUT : DLY BF IN, OUTPUT : LINE OUT
Expand output level 1 Expand output distortion Expand characteristic VODL1 THDDL EXP 11.7 -- -- 9.7 0.25 19.5 -- 2.0 -- dBV % dB VIN = 5.0dBV, V4 = 9.0V VIN = 5.0dBV, V4 = 9.0V,1 VIN = 0dBV 10.0dBV Output level differential VIN = 5.0dBV, V4 = 2.0V (VR = Min. time) Output level differential relative to VoDL1
Expand output level 2
VODL2
--
54
44
dB
Loop INPUT : DLY BF IN, OUTPUT : CMP BF OUT
Loop output level 1 Loop output level 2 VODC1 VODC2 7.5 -- 5.5 42 -- 32 dBV dBV VIN = 5.0dBV, V6 = 9.0V VIN = 5.0dBV, V6 = 2.0V (VR = Min. time) Output level differential relative to VoDC1
Mode holding voltage
MIC OFF holding voltage MIC ON holding voltage V4OFF V4ON 0.0 2.0 -- -- 1.0 9.0 V V -- --
1 2
BW = 0.4-30kHz DIN AUDIO
Unless otherwise noted, V4 = 9.0V (MIC ON), V6 = 9.0V (Max. LOOP GAIN)
5
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