3

Multimedia ICs

BA7726AS / BA7726AFS

Note: Pin type EF: emitter follower, P-P: push-pull, B: base

For pins marked with an asterisk (

Pin No.

Pin name

Function

Voltage

Pin type

2, 1

LINE OUT L / R

Line output (L, R)

4.5V

EF (P - P)

3

L / VF / R CTRL

Line output switching (LEFT / VOCAL FADER / RIGHT)

2.5V

4

MUTE CTRL

Line mute control input

—

6, 5

LINE IN L / R

Line input (L, R)

4.5V

100k

Ω

7

VF LPF1

Vocal fader mode LPF capacitor

4.5V

23.5k

Ω

8

VF LPF2

Vocal fader mode LPF capacitor

4.5V

70.5k

Ω

9

VF LPF3

Vocal fader mode LPF capacitor

4.5V

EF (NPN), 15k

Ω

10

GND

Ground

0.0V

—

11

ECHO LEVEL CTRL Microphone off (ground to 0.1Vcc) / echo level adjustment (0.2Vcc to Vcc)

—

12

LOOP GAIN CTRL

Loop attenuation ratio setting

—

13

EXP DET

Expand detection wave

4.5V

50k

Ω

14

EXP DET CT

Expand attack / recovery time setting

Attack R = 5.6k

Ω , recovery R = 85.6kΩ

—

15

EXP BF IN

BF input

4.5V

B (NPN)

16

DLY BF OUT

LPF BF output (EXP)

4.5V

EF (NPN)

17

DLY BF NF IN

LPF BF negative feedback input (EXP)

4.5V

B (NPN)

18

CMP BF OUT

LPF BF output (CMP)

4.5V

EF (P - P)

19

CMP BF NF IN

LPF BF negative feedback input (CMP)

4.5V

B (NPN)

20

CMP OUT

Compression output

4.5V

EF (NPN)

21

CMP DET CT

Compression attack / recover time setting

Attack R = 5.6k

Ω, recovery R = 85.6kΩ

—

22

CMP DET

Compression detection wave

4.5V

60k

Ω

23

9.0V

—

24

BIAS

Bias and capacitor for ripple rejection

4.5V

23.5k

Ω

25

MIC AMP NF

Microphone amplifier negative feedback

4.5V

2k

Ω

26

MIC AMP IN

Microphone amplifier input

4.5V

100k

Ω

27

ALC DET

ALC attack / recovery time setting

—

220

Ω

28

ALC DET LEVEL

ALC level setting

—

B (PNP)

29

VO DET LEVEL

Microphone amplifier input detection level setting

—

B (PNP)

30

VO DET

Microphone amplifier input detection attack / recover time setting

—

1k

Ω

31

NO / VC CTRL

Line output switching (NORMAL / VOCAL CUT)

—

32

L / ST / R CTRL

Line output switching (LEFT / STEREO / RIGHT)

2.5V

—

—

All figures are designed values based on the measurement circuit in Fig. 1 (where Vcc = 9.0V), and are not guaranteed standards.

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