STV82x6
AGCS
Address (hex): 0Fh
Type: R
Bit 7
Bit 6
0
AGC Control and Status for IF ADC
Register List
Bit 5
Bit 4
AGC_ERR[4:0]
Bit 3
Bit 2
Bit 1
SIG_OVER
Bit 0
SIG_UNDER
Bit Name
Bit 7
AGC_ERR[4:0]
SIG_OVER
SIG_UNDER
Reset
Function
0 Reserved.
00000
Amplifier Gain Control
This is the Gain Control value of ADC. There are 31 steps of +1.25 dB (see Note below).
00000: 0 dB Gain
11110: +37.5 dB Gain
0 AGC Input SIgnal Upper Threshold
0: Normal signal
1: Signal too large and AGC is overloaded
0 AGC Input SIgnal Lower Threshold
0: Normal signal
1: Signal too small and AGC is underloaded
When the AGC is in Automatic mode (AGC_CMD = 0), bits SIG_OVER and SIG_UNDER indicate
if the input signal is too small/large and the AGC is under/overloaded. This is useful when setting
the STV82x6 SIF input level.
Note:
When AGC_CMD = 0, AGC_ERR[4:0] can be read -- indicating the input level. It can also be written
to -- presetting the AGC level which will then adjust itself to the final value.
When AGC_CMD = 1, the AGC is off and writing to AGC_ERR[4:0] directly controls the AGC
amplifier gain. Reading AGC_ERR just confirms the fixed value.
DCS
DC Offset Status for IF ADC
Address (hex): 10h
Type: R
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
DC_ERR[7:0]
Bit 2
Bit 1
Bit 0
Bit Name
DC_ERR[7:0]
Reset
00000000 DC offset error of IF ADC output
Function
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