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參數(shù)資料
| 型號： | AN6426NK |
| 廠商： | PANASONIC CORP |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | Hands-free Speech Network IC |
| 中文描述： | TELEPHONE SPEECH CKT, PDIP42 |
| 封裝： | 0.600 INCH, PLASTIC, SDIP-42 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大?。?/td> | 127K |
| 代理商： | AN6426NK |
7
ICs for Telephone
AN6426NK
I
Pin Descriptions (cont.)
Receiver attenuator
Input : Pin26 (Zi=15k
), Output : Pin25 (emitter out-
put)
The input is of only AC component due to C18 (1
μ
F).
At transmission time, an attenuation amount is varied with-
in a range of about 0 to –36dB by the Gilbert circuit.
The Pin25 is 15kk
and connected to the VB pin (1.2V).
[Control System]
High level ; 1 to 5V, Low level ; 0 to 0.5V
Controllable with the microcomputer.
HS
U
/SP
U
selector switch
Control : Pin30
High : HS
U
, Low : SP
U
Transmitter mute switch
Control : Pin32, High : Transmission,
Low : Mute (MF transmission)
Receiver mute switch
Control : Pin30,
High : Reception, Low : Mute (MF reception)
Attenuator timing control (TAC)
Control : Pin20
Controls the transmitter/receiver attenuator switching
speed with C16(2.2
μ
F). V
20–29
≈
0V in the transmitter
mode, and V
20–29
≈
–120mV in the receiver mode.
Transmitter attenuator control (TAC)
Control : Pin21
Controls the transmitter attenuator gain with R12(22k
)
.
Receiver attenuator control (RAC)
Control : Pin23
Controls the receiver attenuator gain with R13 (22k
).
Transmitter/receiver attenuator control (AC)
Control : Pin22
Controls the transmitter/receiver attenuator gain with R14
(27k
).
Speaker amplifier
Input : Pin4, Output : Pin3, AGC : Pin2
Plus input amplifier of about 34 dB and driven at 25
.
The input is of only AC component due to C3 (10
μ
F). The
output drives the 25
speaker througt C2 (220
μ
F). The
attack time and recovery time for AGC is determined by
C1 (10
μ
F) and R1(220k
).
18
19
26
25
Logic Circuit
30
31
32
20
21
22
23
6
2
5
3
4
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