參數(shù)資料
型號(hào): L64734
廠商: LSI CORP
元件分類: 消費(fèi)家電
英文描述: Tuner and Satellite Receiver Chipset
中文描述: SPECIALTY CONSUMER CIRCUIT, PQFP100
封裝: PLASTIC, QFP-100
文件頁數(shù): 17/48頁
文件大?。?/td> 478K
代理商: L64734
L64733/L64734 Tuner and Satellite Receiver Chipset
17
Analog-to-Digital Converter (ADC) Interface
The ADC module converts the incoming IVIN and QVIN signals into an
internal 6-bit digital representation for processing. The following pins
support the ADC module.
ADCVDDI/Q
ADC Power
These are the analog power supply pins for the ADC
module; they are normally connected to the system
power (V
DD
) plane.
Input
ADCVSSI/Q
ADC Analog Ground
These are the analog ground pins for the ADC module;
they are normally connected to the system ground plane.
Input
VREFP
Reference Voltage, Positive
ADC reference voltage generated by the on-chip
bandgap-based generator. Bypass to GND using a
0.1
μ
F capacitor.
Input/Output
VREFN
Reference Voltage, Negative
ADC reference voltage generated by the on-chip
bandgap-based generator. Bypass to GND using a
0.1
μ
F capacitor.
Input/Output
VMID
Reference Voltage, Middle
ADC reference voltage generated by the on-chip
bandgap-based generator. Bypass to GND using a
0.1
μ
F capacitor.
Input/Output
AGC Control Interface
The AGC Control interface contains signals used for power control.
AGC1, AGC2 Power Control Signals
The AGC1 and AGC2 signals are the positive
Σ
modulated output used for power control. These signals
can each drive an external passive RC filter that feeds a
gain control stage for dual-stage AGC. For a single-stage
AGC, AGC1 can be used.
Output
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