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ICs for Telephone
AN6123MS
Speech network IC with ALC
s 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.
1.9 0.1 0.95 1 0.95 2
0.1 to 0.3
0.10 0.16 + 0.06 -
0.25 1.5 + 0.05 - 0.2 2.8 + 0.3 -
Unit: mm
0.65 0.15
s Features
* Wide supply voltage operation range of VCC = 2.4 V to 6.0 V * Small current consumption of ICC = 500 A * Reduction of a bad effect by the external noise thanks to a package for a rear side mounting.
5 4 0.3
0.2 2.9 + 0.05 -
3
0.4 0.2
0.2 1.1 + 0.1 -
+ 0.1 - 0.05
1.45 0.1
* Cordless telephone, PDC, PHS telephone
MINI-5D
s Block Diagram
Input Output GND
3
4
DET
gm
DET 2
VCC 1
5
0 to 0.1
s Applications
0.8
0.65 0.15
1
AN6213MS
s Pin Descriptions
Pin No. 1 2 3 4 5 VCC DET Input GND Output Description Supply voltage pin Detection pin Signal input pin Grounding pin Signal output pin
ICs for Telephone
s Absolute Maximum Ratings
Parameter Supply voltage Supply current Power dissipation Operating ambient temperature Storage temperature
* *
Symbol VCC ICC PD Topr Tstg
Rating 6.5 3.0 19.5 -20 to +75 -55 to +125
Unit V mA mW C C
Note) *: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25C.
s Recommended Operating Range
Parameter Supply voltage Symbol VCC Range 2.4 to 6.0 Unit V
s Electrical Characteristics at VCC = 3.0 V, f = 1 kHz, Ta = 25C
Parameter Operating current * Design reference data
Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed.
Symbol ICC
Conditions Without signal input
Min
Typ 450
Max 900
Unit A
Parameter Voltage gain Output level ALC control range Total harmonic distortion factor Output noise voltage Input impedance Output impedance
Symbol GV VO ALC THD VNO ZIN ZOUT
Conditions VIN = -40 dBm VIN = -10 dBm Output level varying amount at VIN = -25 dBm, VIN = 0 dBm At VIN = -10 dBm Terminated by CCIT filter input 2 k Pin 3 input impedance Pin 5 output impedance
Min 22 -9.5 -1.5 15 200
Typ 24 -7.5 1 -70 30 400
Max 26 -5.5 1.5 3 -60 45 600
Unit dB dBm dB % dBm k
2
ICs for Telephone
s Application Notes
1. I/O characteristics and distortion
33 F Signal input (Input frequency = 1 kHz) GND 3 10 k Signal output
AN6123MS
4 5 AN6123MS 1 2 1 M 3.0 V
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).
C
10 F
Graph 1. I/O characteristics and distortion (when C = 10 F)
0 -5 -10 10 Output level 8 6 4 Distortion 2 0 10 -15 -20 -25 -30 -35 -40 -45 -50 -70 -60 -50 -40 -30 -20 -10 0 12
Output level (dBm)
Input level (dBm)
Graph 2. Distortion characteristics when C is variable
13 12 11 10 9 8 7 6 5 4 3 2 1 0 -40
Distortion (%)
C = 10 F C = 4.7 F C = 2.2 F
C = 1.0 F
-35
-30
-25
-20
-15
-10
-5
0
5
10
Input lebve; (dBm)
Distortion (%)
3
AN6213MS
s Application Notes (continued)
2. Input level adjustment for maximum output Signal input (1 kHz) 3.3 k 33 F R 3 GND 10 k Signal output
ICs for Telephone
4 5 AN6123MS 1 2 1M 3.0 V 10 F
2 200 pF
10 F
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 k. 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 and the desired input level becomes 17.3 dBm.
I/O characteristics
0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 -55 -60 -70 -65 -60 -55 -50 -45 -40 -35 -30 -25 -20 -15 -10 -5 0 R = 1 k R = 3 k R = Open
Output level (dBm)
Input level (dBm)
3. Output level adjustment for a maximum output
Signal input (1 kHz) 3.3 k 33 F 3 GND 10 k Signal output
4 5 AN6123MS 1 2 1M 3.0 V
R
2 200 pF
10 F
10 F
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 k. It is an attenuated value of by 3.4 dB against open mode. Therefore, the maximum output becomes -11 dBm. Likewise, for R = 10 k, attenuation is 6 dB and the maximum output becomes -13.5 dBm.
I/O characteristics
0 -5 R = Open R = 20 k
Output level (dBm)
-10 -15 -20 -25 -30 -35 -50 -45 -40 -35 -30
R = 10 k
-25
-20
-15
-10
Input level (dBm)
4
ICs for Telephone
s Application Notes (continued)
4. Frequency characteristics
AN6123MS
Signal input 33 F 3
GND
10 k R
Signal output
4 5 AN6123MS 1 2 1 M 3.0 V
C
10 F
10 F
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 k and C = 2 200 pF, that is the frequency at which the frequency characteristic deteriorates by 3 dB, is fC = 1/2CR = 7.2 kHz. At R = 10 k and C = 1 000 pF, it is 16 kHz. (Refer to the graph.)
Frequency characteristics
10 8 6 4 For C = 1 000 pF
Gain (dB)
2 0 -2 -4 -6 -8 -10 100 1k 10k 100k Input signal level: -10 dBm For C = 2 200 pF
Input frequency (Hz)
s Application Circuit Example
Signal output 0.9 V[p-p] Noise = -70 dBm Distortion = 1%
Signal input (300 Hz 3 kHz) 3.3 k R
33 F
GND
10 k
2 200 pF
3
4
G = 30 dB
DET
gm
10 F
2
1
5
VCC 1 M 2.4 V 6.0 V
10 F
5
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(1) An export permit needs to be obtained from the competent authorities of the Japanese Government if any of the products or technologies described in this material and controlled under the "Foreign Exchange and Foreign Trade Law" is to be exported or taken out of Japan. (2) The technical information described in this material is limited to showing representative characteristics and applied circuit examples of the products. It does not constitute the warranting of industrial property, the granting of relative rights, or the granting of any license. (3) The products described in this material 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. (4) The products and product specifications described in this material are subject to change without notice for reasons of 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 guaranteed values, in particular those of maximum rating, the range of operating power supply voltage and heat radiation characteristics. 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, redundant design is recommended, so that such equipment may not violate relevant laws or regulations because of the function of our products. (6) When using products for which dry packing is required, observe the conditions (including shelf life and after-unpacking standby time) agreed upon when specification sheets are individually exchanged. (7) No part of this material may be reprinted or reproduced by any means without written permission from our company.
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2001 MAR

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