BA7726AFS ROHM Electronics, BA7726AFS Datasheet - Page 10

• Manufacturer Part Number: BA7726AFS
• Manufacturer: ROHM Electronics

(8) Microphone input detection function
•
V
0.5
10
• This function detects the signal input to MIC AMP IN
• The detection level is determined by the voltage
Multimedia ICs
ODET
Application example
(pin 26) and outputs it to pin 30.
impressed on pin 29 (V
between Vcc and the ground) and is calculated with
the following equation, although slight error occurs
as V28 approaches ground.
No signal input to MIC AMP IN (pin 26)
Signal input to MIC AMP IN (pin 26)
V
29
0.03
+
32
1
OUTSW
0.85
+
31
2
(
2
30
3
1
(V
+
+
VOCAL
CC
DET
2
29
4
– 1.0), at MIC AMP IN
28
29
5
V
ALC
, set with resistive division
29
) [V
27
6
+
SW
rms
26
VR
7
VOCAL
FADER
],
0.068
0.015
+
25
8
–
Pin 30 output
+
24
V
9
CC
GND
– 1.0V
23
10
56k
10k
10k
2.7k
22
VR
11
LEVEL
COMPRESS
ECHO
+
21
VR
12
LOOP GAIN
20
EXPAND
13
Fig.8
18k
+
19
14
47k
–
39k
18
15
Fig. 7 Microphone amplifier input detection level vs.
220p
BA7726AFS
– 20
– 70
17
16
–
pin 29 voltage
0
These are figures for standard samples and
are not guaranteed standards.
3900p
Set within this range
BA7726AS / BA7726AFS
Pin 29 voltage: V29 (V)
18k
at MIC AMP IN (f = 1kHz)
+
1000p
+
+
1
1
5
V
S
and
CC
H
BU9252F
A / D
8bit
= 9.0V
10
0.1