ICs for Telephone
AN6123MS
Speech network IC with ALC
■ Overview
Unit: mm
+0.20
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.
2.80 –0.30
1.50 +0.25
–0.05
0.95
3
1
2
+0.10
0.16 –0.06
0 to 0.10
0.80
1.10 –0.10
+0.20
0.30 –0.05
+0.10
• Wide supply voltage operation range of VCC = 2.4 V to
6.0 V
• Small current consumption of ICC = 500 µA
• Reduction of a bad effect by the external noise thanks to
a package for a rear side mounting.
4
0.95
+0.20
2.90 –0.05
■ Features
1.90±0.10
5
0.65±0.15
1.45±0.10
0.65±0.15
■ Applications
• Cordless telephone, PDC, PHS telephone
0.1 to 0.30
0.40±0.20
MINI-5D
gm
DET 2
VCC 1
DET
5
4
3
Input
GND
Output
■ Block Diagram
Publication date: February 2001
SDE00002CEB
1
AN6123MS
■ Pin Descriptions
Pin No.
Description
1
VCC
Supply 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
VCC
6.5
V
Supply current
ICC
3.0
mA
Power dissipation
PD
19.5
mW
Operating ambient temperature *
Topr
−20 to +75
°C
Storage temperature *
Tstg
−55 to +125
°C
Note) *: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25°C.
■ Recommended Operating Range
Parameter
Supply voltage
Symbol
Range
Unit
VCC
2.4 to 6.0
V
■ Electrical Characteristics at VCC = 3.0 V, f = 1 kHz, Ta = 25°C
Parameter
Operating current
Symbol
ICC
Conditions
Without signal input
Min
Typ
Max
Unit
450
900
µA
• Design reference data
Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed.
Parameter
Conditions
Min
Typ
Max
Unit
Voltage gain
GV
VIN = −40 dBm
22
24
26
dB
Output level
VO
VIN = −10 dBm
−9.5
−7.5
−5.5
dBm
−1.5
1.5
dB
ALC control range
∆ALC
Output level varying amount
at VIN = −25 dBm, VIN = 0 dBm
Total harmonic distortion factor
THD
At VIN = −10 dBm
1
3
%
Output noise voltage
VNO
Terminated by CCIT filter input 2 kΩ
−70
−60
dBm
Input impedance
ZIN
Pin 3 input impedance
15
30
45
kΩ
ZOUT
Pin 5 output impedance
200
400
600
Ω
Output impedance
2
Symbol
SDE00002CEB
AN6123MS
■ Application Notes
1. I/O characteristics and distortion
0.33 µF
Signal input
(Input frequency = 1 kHz)
10 kΩ
GND
3
4
5
AN6123MS
1
2
2 200 pF
1 MΩ
C
Signal output
3.0 V
The I/O characteristics in the circuit shown
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).
10 µF
Graph 1. I/O characteristics and distortion (when C = 10 µF)
12
0
−5
10
Output level
−15
8
−20
−25
6
−30
4
−35
−40
Distortion
Distortion (%)
Output level (dBm)
−10
2
−45
−50
−70
−60
−50
−40
−30
−20
−10
0
10
0
Input level (dBm)
Distortion (%)
Graph 2. Distortion characteristics when C is variable
13
12
11
10
9
8
7
6
5
4
3
2
1
0
−40
C = 10 µF
C = 1.0 µF
C = 4.7 µF
C = 2.2 µF
−35
−30
−25
−20
−15
−10
−5
0
5
10
Input lebve; (dBm)
SDE00002CEB
3
AN6123MS
■ Application Notes (continued)
2. Input level adjustment for maximum output
Signal input
(1 kHz)
0.33 µF
3.3 kΩ
3
R
Signal output
10 kΩ
GND
4
5
AN6123MS
1
2
2 200 pF
1M Ω
10 µF
3.0 V
10 µF
You can adjust R in the left circuit diagram
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.
I/O characteristics
0
−5
Output level (dBm)
−10
−15
R = Open
−20
−25
−30
−35
R = 3 kΩ
−40
R = 1 kΩ
−45
−50
−55
−60
−70 −65 −60 −55 −50 −45 −40 −35 −30 −25 −20 −15 −10
−5
0
Input level (dBm)
3. Output level adjustment for a maximum output
Signal input
(1 kHz)
0.33 µF
3.3 kΩ
10 kΩ
GND
3
4
5
AN6123MS
1
2
R
1M Ω
10 µF
Signal output
3.0 V
2 200 pF
10 µF
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.
I/O characteristics
0
R = Open
Output level (dBm)
−5
R = 20 kΩ
−10
−15
R = 10 kΩ
−20
−25
−30
−35
−50
−45
−40
−35
−30
−25
Input level (dBm)
4
SDE00002CEB
−20
−15
−10
AN6123MS
■ Application Notes (continued)
4. Frequency characteristics
Signal input 0.33 µF
10 kΩ
GND
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 fC
at R = 10 kΩ and C = 2 200 pF, that is the frequency
at which the frequency characteristic deteriorates
by 3 dB, is fC = 1/2πCR = 7.2 kHz. At R = 10 kΩ
and C = 1 000 pF, it is 16 kHz. (Refer to the graph.)
Signal output
R
3
4
5
AN6123MS
1
2
10 µF
C
10 µF
1 MΩ
3.0 V
Frequency characteristics
10
8
For C = 1 000 pF
6
Gain (dB)
4
2
0
Input signal level: −10 dBm
−2
For C = 2 200 pF
−4
−6
−8
−10
100
1k
10k
100k
Input frequency (Hz)
■ Application Circuit Example
Signal input
(300 Hz to 3 kHz)
GND
10 kΩ
R
G = 30 dB
10 µF
gm
1
2
DET
5
4
2 200 pF
3
3.3 kΩ
0.33 µF
Signal output
0.9 V[p-p]
Noise = −70 dBm
Distortion = 1%
VCC
1 MΩ
2.4 V to 6.0 V
SDE00002CEB
10 µF
5
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2001 MAR
