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参数资料
| 型号： | TUA4300G |
| 厂商： | SIEMENS A G |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封装： | MQFP-64 |
| 文件页数： | 34/38页 |
| 文件大小： | 393K |
| 代理商： | TUA4300G |
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FS: 04/93
Page 6
3. AM - MODE
In the AM mode the 1st IF is converted by the 2nd mixer into the 2nd IF in the 450 kHz range. Therefore a 2nd LO,
which is used with quartz or as input for external sources, is part of the IC. An AGC in this mixer increases
sensitivity. The 2nd IF signal passes an automatic gain controlled IF amplifier and is then demodulated to the AF
in a quasisynchronous demodulator. Switching to seek mode, the AGC time constant is reduced by a factor of 5,
the 2nd mixer AGC is forced to high gain, the AM IF counter output is switched on and the AF is muted. The AGC
voltage is used as AM field strength and is fed to the combined field strength output.
SIEMENS AG
IC-SPECIFICATION
TUA 4300 G
–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
Circuit Description
–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
.The reproduction, transmission or use of this document or its contents is not permitted without express written authority. Offenders will be liable for damages. All rights, including rights created
by patent grant or registration of a utility model or design, are reserved
HL DOK
V66047-S695-G100-G1
12.11.96
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