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參數(shù)資料
| 型號(hào)： | 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)： | 6/9頁 |
| 文件大?。?/td> | 127K |
| 代理商： | AN6426NK |
6
ICs for Telephone
AN6426NK
I
Pin Descriptions (cont.)
Receiver output
Output : Pin7, Pin8
Drives the ceramic receiver directly. The gain depends on
an internal resistance and is about 23dB.
The frequency characteristic control capacitors C5
(0.033
μ
F) and C6 (0.033
μ
F), and output level control
resistors R2(1k
)and R3 (1k
)are attached.
2. Hand-free Speech network Block (SP
U
)
[Transmitter System]
Microphone amplifier
Input : Pin12(minus input), Output : Pin13(emitter out-
put)
The gain and frequency characteristics are determined by
the external resistors R7(820
)and R6(47k
), and capaci-
tors C10 (1
μ
F) and C9 (820pF). R37 (2.2k
) is a resistor
for the power supply to ECM.
Transmitter log amplifier
Input : Pin14(current input), Output : Pin15 (voltage out-
put)
The input voltage is converted into a current at
R8(390
)and C11 (0.1
μ
F). The attack and recovery time
are determined by R9 (2.2M
)and C12(1
μ
F).
Receiver log amplifier
Input : Pin28 (current input), Output : Pin27 (voltage out-
put)
The input voltage is converted into a current at R17
(2.2k
)and C20 (0.1
μ
F). The attack and recovery time are
determined by R16 (2.2M
)and C19 (1
μ
F).
Noise detector circuit
Output : Pin16, Pin17
When a continuous sound (noise 9) is input, the transmitter
is set to –10dB.
The attack time for this operation is determined by R10
(100k
)and C27 (22
μ
F), and the recovery time by
R11(220k
)and C15 (2.2
μ
F).
To stop the noise detector circuit, ground the Pin16.
Receiver VR
Control : Pin24
A smoothed voltage is given by C17 (33
μ
F).
Normally, VB (Pin35) is divided and given by R15
(20k
). The output becomes maximum when the voltage
at the Pin24 is VB, and –31dB when 0V.
Transmitter attenuator
Input : Pin18 (Zi=15k
), Output : Pin19 (emitter out-
put)
The input is of only AC component due to C14 (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 Pin18 is 15k
and connected to the VB Pin (1.2V)
8
7
12
13
+
–
24
27
15
16
17
28
14
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