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參數(shù)資料
| 型號(hào)： | AN6426NK |
| 廠商： | PANASONIC CORP |
| 元件分類： | 無(wú)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(yè)數(shù)： | 5/9頁(yè) |
| 文件大?。?/td> | 127K |
| 代理商： | AN6426NK |
5
ICs for Telephone
AN6426NK
I
Pin Descriptions
1. Hand Set Communications Block (HSu)
[ Transmitter System]
Microphone amplifier
Input : pin3 (minus input), Output : Pin38 (collector out-
put)
The gain and frequency characteristics are determined by
the external resistors R19 (6.8k
)and R20 (43k
), and
capacitors C24 (0.068
μ
F)and C25 (1,000pF).
R21 (2.2k
)is a resistor for the power supply for ECM.
Transmitter selector switch
Input : Pin39 (speech), Pin40 (MF, holding tone)
The switch changes over transmitter input for hand set
communications, transmitter input for hand-free communi-
cations, and MF (Multi Frequency) input. The input impe-
dance at the Pin39 is 3.9k
and DC is VR (Pin34)
C33 (4.7
μ
F) is a DC preventive capacitor. R22 (33k
) is
to adjust the input to the log amplifier. which is to detect
the transmission level. It attenuates the amplifier input to
3.9/(3.9+R22 (33k
)
The input impedance at the Pin40 is 3.35k
and DC is VR.
C34 is input through 10
μ
F.
Transmitter automatic pad
Control : Pin33
Varies the transmitter/receiver gain by the value of the
current supplied to the IC. A variable point can be
moved by R18 (100k
). Increasing R18 causes AP to
start operation at a higher line current.
[Receiver System]
Receiver preamplifier
Input : Pin11(minus input), Output : Pin10 (collector out-
put)
The gain and frequency characteristics are determined by
the external resistors R5 (1k
)and R4 (22k
), and capac-
itors C8 (0.1
μ
F)and C7 (3,300pF)
Receiver selector switch
Input : Pin10, Pin40
The switch changes over receiver input for hand set com-
munications and MF input.
Receiver automatic pad
Control : Pin33
Common with transmitter automatic pad
Receiver buffer amplifier
Output : Pin9
Outputs a receiver signal for hand-free communications at
low inpedance.
37
38
40
39
33
11
10
9
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