参数资料
型号: T4260ILS
厂商: ATMEL CORP
元件分类: 调谐器
英文描述: AUDIO TUNER, PDSO44
封装: SSO-44
文件页数: 9/30页
文件大小: 299K
代理商: T4260ILS
17
T4260
4528I–AUDR–08/04
SW2/AGC (Pin 11)
The pin SW2/AGC works as a switching output (open drain, pin 11) or as an AM AGC-
control pin to control the cascade stage of an external AM-preamplifier.
The SW2/AGC is controlled by bits 47 and 48 as given in Table 16.
Note:
In AGC mode, the output voltage is 6 V down to 1 V.
Figure 6. Internal Components at SW2/AGC
Test Mode
A special test mode is implemented for final production test only. This mode is activated
by setting bit 123 = 1. This mode is not intended to be used by customer application. For
normal operation bit 123 has to be set to 0.
AM Mixer
The AM mixer is used for up-conversion of the AM reception frequency to the IF
frequency. Therefore, an AM prescaler is implemented to generate the necessary LO
frequency from the VCO frequency.
The VCO divider can be controlled by the bits 140 to 143 as given in Table 18 on page
18. (The VCO divider is only active in AM mode)
Table 16. Switching Output 2/AGC Mode
SW2/AGC
B48
B47
AGC function
0
X
High
1
0
Low
1
SWO/AGC
V
S
AGC
SW2
Table 17. Test Mode
Test Mode
B123
ON
1
OFF
0
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