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参数资料
| 型号： | TA2057N |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PDIP24 |
| 封装： | SDIP-24 |
| 文件页数： | 17/18页 |
| 文件大小： | 970K |
| 代理商： | TA2057N |
TA2057N
2002-10-30
8
Application Note
1. How to control the IF count output signal (pin(9) output)
Tun LED
On
Off
H
Come on
Non output
V9
Open
Non output
Mute Circuit
H
On
V9
Open
Off
Whether or not there is the IF count output signal (pin(9) output) is determined by the and of the pin(9) control
voltage: V9 and tuning LED on / off switching.
In the condition of
V9: High (active high, VTH = 2V (type.) )
Tun LED: On (Vin ≥ VL + 2dB (type.) )
The IF count output signal come out from the pin(9).
The signal waveform is FM: Rectangular, AM: Differential wave, and the level is 500mVp-p (typ.)
Mute circuit is action by the pin(9) control voltage: V9 (at high) in matrix output circuit.
2. How to adjust the IF count output sensitivity
The IF count output sensitivity (search sensitivity) can be adjusted by varying the IF amp. Gain for FM and
varying the mixer gain for AM.
However, this is only possible at the auto-tuning mode (external voltage supplied to pin(9) is at high level). The
original gain returns while receiving a broadcast station (supplied voltage to pin(9) is at low level).
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