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
• Cordless telephone, PDC, PHS telephone
1.45±0.10
+0.10
0.1 to 0.30
0.40±0.20
MINI-5D
DET
gm
Publication date: February 2001
VCC
DET 2
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■ Block Diagram
0.16 –0.06
+0.20
0.80
1.10 –0.10
0 to 0.10
■ Applications
2
+0.10
0.95
3
1
3d Input
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• 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
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0.65±0.15
0.30 –0.05
0.65±0.15
SDE00002CEB
1
AN6123MS
■ Pin Descriptions
Pin No.
Description
VCC
Supply voltage pin
2
DET
Detection pin
3
Input
Signal input pin
4
GND
Grounding pin
5
Output
Signal output pin
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Parameter
Supply voltage
Supply current
Power dissipation
Operating ambient temperature *
Storage temperature *
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■ Absolute Maximum Ratings
Symbol
Rating
Unit
VCC
6.5
V
ICC
3.0
mA
PD
19.5
mW
Topr
−20 to +75
°C
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
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■ Electrical Characteristics at VCC = 3.0 V, f = 1 kHz, Ta = 25°C
Operating current
ICC
• Design reference data
Conditions
Without signal input
Min
Typ
Max
Unit

450
900
µA
en
an
Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed.
Ma
Voltage gain
int
Parameter
Output level
Conditions
Min
Typ
Max
Unit
GV
VIN = −40 dBm
22
24
26
dB
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
10 kΩ
GND
3
4
5
AN6123MS
1
2
Signal output
2 200 pF
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).
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0.33 µF
Signal input
(Input frequency = 1 kHz)
1 MΩ
C
10 µF
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3.0 V
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
−45
−50
−70
−60
−50
−40
−30
Distortion (%)
Output level (dBm)
−10
2
−20
−10
0
10
0
Input level (dBm)
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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
4
5
AN6123MS
1
2
2 200 pF
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R
Signal output
10 kΩ
GND
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.
1M Ω
10 µF
10 µF
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3.0 V
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
0.33 µF
10 kΩ
GND
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Signal input
(1 kHz)
3.3 kΩ
1M Ω
3.0 V
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10 µF
4
5
AN6123MS
1
2
an
3
Signal output
R
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
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C
10 µF
10 µF
1 MΩ
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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
ue
Signal input
(300 Hz to 3 kHz)
GND
10 kΩ
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0.33 µF
R
2 200 pF
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3
3.3 kΩ
Signal output
0.9 V[p-p]
Noise = −70 dBm
Distortion = 1%
G = 30 dB
10 µF
gm
1
2
DET
VCC
1 MΩ
2.4 V to 6.0 V
SDE00002CEB
10 µF
5
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semiconductors described in this book
(1) If any of the products or technical information described in this book is to be exported or provided to non-residents, the laws and
regulations of the exporting country, especially, those with regard to security export control, must be observed.
(2) The technical information described in this book is intended only to show the main characteristics and application circuit examples
of the products, and no license is granted under any intellectual property right or other right owned by our company or any other
company. Therefore, no responsibility is assumed by our company as to the infringement upon any such right owned by any other
company which may arise as a result of the use of technical information described in this book.
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(3) The products described in this book are intended to be used for standard applications or general electronic equipment (such as office
equipment, communications equipment, measuring instruments and household appliances).
Consult our sales staff in advance for information on the following applications:
– Special applications (such as for airplanes, aerospace, automobiles, traffic control equipment, combustion equipment, life support
systems and safety devices) in which exceptional quality and reliability are required, or if the failure or malfunction of the products may directly jeopardize life or harm the human body.
– Any applications other than the standard applications intended.
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(4) The products and product specifications described in this book are subject to change without notice for modification and/or improvement. At the final stage of your design, purchasing, or use of the products, therefore, ask for the most up-to-date Product
Standards in advance to make sure that the latest specifications satisfy your requirements.
(5) When designing your equipment, comply with the range of absolute maximum rating and the guaranteed operating conditions
(operating power supply voltage and operating environment etc.). Especially, please be careful not to exceed the range of absolute
maximum rating on the transient state, such as power-on, power-off and mode-switching. Otherwise, we will not be liable for any
defect which may arise later in your equipment.
Even when the products are used within the guaranteed values, take into the consideration of incidence of break down and failure
mode, possible to occur to semiconductor products. Measures on the systems such as redundant design, arresting the spread of fire
or preventing glitch are recommended in order to prevent physical injury, fire, social damages, for example, by using the products.
(6) Comply with the instructions for use in order to prevent breakdown and characteristics change due to external factors (ESD, EOS,
thermal stress and mechanical stress) at the time of handling, mounting or at customer's process. When using products for which
damp-proof packing is required, satisfy the conditions, such as shelf life and the elapsed time since first opening the packages.
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(7) This book may be not reprinted or reproduced whether wholly or partially, without the prior written permission of Matsushita
Electric Industrial Co., Ltd.