stv8226t STMicroelectronics, stv8226t Datasheet - Page 44

• Manufacturer Part Number: stv8226t
• Description: Multistandard Tv Audio Processor And Digital Sound Demodulator
• Manufacturer: STMicroelectronics

Register List
Note:
44/97
Address (hex): 0Eh
Type: R/W
AGC_CMD
AGC_REF[2:0]
AGC_CST[1:0]
AGC_CMD
Bit Name
Bit Name
FM1_CAR
Bit 7
FM1_SQ
Bits[6:5]
These registers allow direct access to the demodulator signal detectors.
AGCC
Bit 6
Reset
Reset
0
100
00
01
0
0
0
Channel 1 FM/AM Carrier detector flag
0: Not detected
1: Detected
Channel 1 FM Squelch detector flag
0: Not detected
1: Detected
Automatic Gain Control Command Mode
Normally set to 0 enabling automatic mode. For L/L’ standards, the AGC should be switched off
due to the presence of the AM sound carrier. In this case, a fixed gain value should be set using
the AGCS register.
0: Automatic mode. AGC controlled by the AUTOSTD function. (Default)
1: Manual/Forced mode
Reserved.
This bitfield is used to defines the clipping level which adjusts the allowable proportion of samples
at the input of the ADC which will be clipped. The AGC tries to maximize the use of the full scale
range of the ADC. The default setting gives a ratio of 1/256.
000:
001:
010:
011:
AGC Time Constant
This is the time constant between each step of 1.25 dB by the ADC.
00
01
10
11
Bit 5
0
AGC Control for IF ADC
Clipping Ratio
1/16 (Single carrier)
1/32
1/64
1/128
Step Duration (ms)
1.33
2.66
5.33
10.66
Bit 4
AGC_REF[2:0]
Bit 3
100:
101:
110:
111:
Function
Function
Clipping Ratio
1/256 (Default
1/512
1/1024
1/2048 (Multiple carriers)
Bit 2
Bit 1
AGC_CST[1:0]
STV82x6
Bit 0