an6123ms Panasonic Corporation of North America, an6123ms Datasheet - Page 4

• Manufacturer Part Number: an6123ms
• Description: Speech Network Ic With Alc
• Manufacturer: Panasonic Corporation of North America

AN6123MS
Signal input
4
Signal input
2. Input level adjustment for maximum output
3. Output level adjustment for a maximum output
(1 kHz)
(1 kHz)
Application Notes (continued)
3.3 k
3.3 k
10 F
10 F
0.33 F
0.33 F
R
3
3
AN6123MS
AN6123MS
2
2
10
15
20
25
30
35
1M
0
5
1M
50
10
15
20
25
30
35
40
45
50
55
60
GND
GND
0
5
4
70
4
65
1
45
1
3.0 V
3.0 V
60
5
5
10 k
10 k
R Open
40
55
10 F
10 F
50
I/O characteristics
I/O characteristics
R 1 k
R
Input level (dBm)
35
Signal output
SDE00002CEB
Signal output
Input level (dBm)
45
2 200 pF
40
2 200 pF
R 3 k
30
35
R Open
R 20 k
R 10 k
30
25
25
to find the operation point for a maximum out-
put level. For example, since the input level for
a maximum output is 30 dBm when R is open
and the attenuation in the input stage is 20 log
(3k/6.3k)
a total gain loss is 6.4 dB as compared with
open mode, hence the input level to get the
maximum output is 23.6 dBm.
1 k and the desired input level becomes 17.3
dBm.
by R in the left circuit diagram.
when R is open, it is 20 log (20k/30k)
dBm at R 20 k . It is an attenuated value of by
3.4 dB against open mode. Therefore, the maxi-
mum output becomes 11 dBm. Likewise, for R
output becomes 13.5 dBm.
10 k , attenuation is 6 dB and the maximum
20
20
You can adjust R in the left circuit diagram
Likewise, the attenuation is 12.7 dB for R
The maximum output level can be adjusted
Since the maximum output is 7.5 dBm
15
15
10
6.4 dB when R is 3 k . This means
5
10
0
3.5