Datasheet AN6123MS Datasheet (Panasonic)

ICs for Telephone

AN6123MS

Speech network IC with ALC

■ Overview

The AN6123MS is an ALC IC for level control of

audio signal (300 Hz to 3 kHz).

Adopting a mini 5-pin package, mounting on a small

area is possible.

■ Features

• Wide supply voltage operation range of VCC = 2.4 V to

6.0 V

• Small current consumption of I

= 500 µA

CC

• Reduction of a bad effect by the external noise thanks to

a package for a rear side mounting.

■ Applications

• Cordless telephone, PDC, PHS telephone

■ Block Diagram

32

GND

4

Output

51

4

0.3

+ 0.1

− 0.05

0.15

0.65 ±

+ 0.2

− 0.3

+ 0.25

− 0.05

2.8

1.5

35

0.15

0.1

0.65 ±

+ 0.2

− 0.1

0.8

1.1

0 to 0.1

0.1

1.9 ±

0.95

0.95

12

1.45 ±

+ 0.2

2.9

− 0.05

MINI-5D

0.16

+ 0.10

− 0.06

Unit: mm

0.1 to 0.3

0.2

0.4 ±

DET

DET Input

g

m

CC

V

1

AN6213MS ICs for Telephone

■ Pin Descriptions

Pin No. Description

1VCCSupply voltage pin
2 DET Detection pin
3 Input Signal input pin
4 GND Grounding pin
5 Output Signal output pin

■ Absolute Maximum Ratings

Parameter Symbol Rating Unit

Supply voltage V
Supply current I
Power dissipation P
Operating ambient temperature
Storage temperature

Note)*: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25°C.

*

*

CC

CC

D

T

opr

T

stg

6.5 V

3.0 mA

19.5 mW

−20 to +75 °C

−55 to +125 °C

■ Recommended Operating Range

Parameter Symbol Range Unit

Supply voltage V

CC

2.4 to 6.0 V

■ Electrical Characteristics at VCC = 3.0 V, f = 1 kHz, Ta = 25°C

Parameter Symbol Conditions Min Typ Max Unit

Operating current I

• Design reference data

Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed.

Parameter Symbol Conditions Min Typ Max Unit

Voltage gain G
Output level V
ALC control range ∆ALC Output level varying amount −1.5  1.5 dB

Total harmonic distortion factor THD At VIN = −10 dBm 1 3 %
Output noise voltage V
Input impedance Z
Output impedance Z

Without signal input  450 900 µA

CC

VIN = −40 dBm 22 24 26 dB

V

VIN = −10 dBm −9.5 −7.5 −5.5 dBm

O

at VIN = −25 dBm, V

Terminated by CCIT filter input 2 kΩ

NO

Pin 3 input impedance 15 30 45 k Ω

IN

Pin 5 output impedance 200 400 600 Ω

OUT

= 0 dBm

IN

−70 −60 dBm

2

ICs for Telephone AN6123MS

■ Application Notes

1. I/O characteristics and distortion

33 µF

Signal input
(Input frequency = 1 kHz)

C

GND

10 kΩ

Signal output

The I/O characteristics in the circuit shown

3

AN6123MS

2

4

5

2 200 pF

1

on the left can be referred to in the graph below.
Also note that if the C in the circuit is lowered,
the distortion characteristics will become worse
(Graph 2).

1 MΩ

3.0 V

10 µF

Graph 1. I/O characteristics and distortion (when C = 10 µF)

0

−5

−10

−15

−20

−25

−30

−35

Output level (dBm)

−40

−45

−50

Output level

Distortion

−70 −60 −50 −40 −30 −20 −10 0 10

Input level (dBm)

12

10

8

6

4

Distortion (%)

2

0

Graph 2. Distortion characteristics when C is variable

13
12
11
10

9
8
7
6
5

Distortion (%)

4
3
2
1
0

−40 −35 −30 −25 −20

C = 4.7 µF

C = 10 µF

C = 2.2 µF

−10 −5

−15

Input lebve; (dBm)

C = 1.0 µF

0510

3

AN6213MS ICs for Telephone

■ Application Notes (continued)

2. Input level adjustment for maximum output

You can adjust R in the left circuit diagram

Signal input

(1 kHz)

3.3 kΩ

10 µF

33 µF

R

GND

3

4

AN6123MS

2

1M Ω

0

−5

−10

−15

−20

−25

−30

−35

−40

−45

Output level (dBm)

−50

−55

−60

−70 −65 −60 −55 −50

1

3.0 V

10 kΩ

5

10 µF

I/O characteristics

R = Open

Signal output

2 200 pF

R = 3 kΩ

R = 1 kΩ

−40 −35 −30 −25 −20 −15 −10 −50

−45

Input level (dBm)

to find the operation point for a maximum out­put 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 kΩ and the desired input level becomes 17.3
dBm.

3. Output level adjustment for a maximum output

Signal input

(1 kHz)

3.3 kΩ

33 µF

GND

3

4

10 kΩ

5

R

AN6123MS

1

10 µF

10 µF

2

1M Ω

3.0 V

I/O characteristics

0

−5

−10

−15

−20

−25

Output level (dBm)

−30

−35

−50 −45 −40 −35 −30 −25 −20 −15 −10

Input level (dBm)

Signal output

2 200 pF

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 maxi­mum output becomes −11 dBm. Likewise, for R
= 10 kΩ, attenuation is 6 dB and the maximum
output becomes −13.5 dBm.

R = Open
R = 20 kΩ

R = 10 kΩ

4

ICs for Telephone AN6123MS

■ Application Notes (continued)

4. Frequency characteristics

Signal input

10 µF

33 µF

GND

3

AN6123MS

2

1 MΩ

10

8
6
4
2

(dB)

0

−2

Gain

−4

−6

−8

−10

10 kΩ

Signal output

R

4

5

C

1

10 µF

3.0 V

Frequency characteristics

Input signal level: −10 dBm

For C = 2 200 pF

100 1k 10k 100k

Input frequency

(Hz)

The AN6123MS itself has an almost flat fre­quency characteristic in the audio frequency band.
The high-band frequency is set with R and C
shown in the left circuit. The cut-off frequency f
at R = 10 kΩ and C = 2 200 pF, that is the frequency
at which the frequency characteristic deteriorates
by 3 dB, is f

= 1/2πCR = 7.2 kHz. At R = 10 kΩ

C

and C = 1 000 pF, it is 16 kHz. (Refer to the graph.)

For C = 1 000 pF

C

■ Application Circuit Example

Signal input
(300 Hz ∼ 3 kHz)

3.3 kΩ

G = 30 dB

R

10 µF

33 µF

32

DET

1 MΩ

GND

4

g

m

V

CC

2.4 V ∼ 6.0 V

10 kΩ

51

Signal output

0.9 V[p-p]
Noise = −70 dBm
Distortion = 1%

2 200 pF

10 µF

5