AN6123 datasheet(4/5 Pages) PANASONIC

Part #	AN6123

Description	Speech network IC with ALC

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Manufacturer	PANASONIC [Panasonic Semiconductor]

Direct Link	http://www.panasonic.com/industrial/

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4

AN6213MS

ICs for Telephone

s Application Notes (continued)

2. Input level adjustment for maximum output

You can adjust R in the left circuit diagram

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)

= −6.4 dB when R is 3 kΩ. This means

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.

Likewise, the attenuation is 12.7 dB for R

=

1 k

Ω and the desired input level becomes 17.3

dBm.

I/O characteristics

GND

10 k

Ω

2 200 pF

33

µF

10

µF

10

µF

1M

Ω

3.0 V

Signal input

(1 kHz)

4

3

2

5

1

AN6123MS

R

3.3 k

Ω

Signal output

−60

−70 −65 −60 −55 −50 −45 −40 −35 −30 −25 −20 −15 −10 −50

−55

−50

−40

−45

−35

−30

−25

−20

−15

−10

−5

0

Input level (dBm)

R

= 3 kΩ

R

= Open

R

= 1 kΩ

3. Output level adjustment for a maximum output

The maximum output level can be adjusted

by R in the left circuit diagram.

Since the maximum output is

−7.5 dBm

when R is open, it is 20 log (20k/30k)

= −3.5

dBm at R

= 20 kΩ. It is an attenuated value of by

3.4 dB against open mode. Therefore, the maxi-

mum output becomes

−11 dBm. Likewise, for R

= 10 kΩ, attenuation is 6 dB and the maximum

output becomes

−13.5 dBm.

I/O characteristics

−35

−30

−25

−20

−15

−10

−5

0

−50

−45

−40

−35

−30

−25

−20

−15

−10

Input level (dBm)

R

= 10 kΩ

R

= Open

R

= 20 kΩ

GND

10 k

Ω

2 200 pF

33

µF

10

µF

10

µF

1M

Ω

3.0 V

Signal output

Signal input

(1 kHz)

4

3

2

5

1

AN6123MS

R

3.3 k

Ω

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