Nikon D100 VBA10201 Repair Manual page 87

② -2. Function
② -2-1. CCD PCB
• CCD
Effective pixels for image: 6.15million
• Optical low-pass filter (OLPF)
This is the optical low-pass filter to suppress Moire.
• Timing generator and digital signal preprocessing circuit
This is a custom ASIC, and the timing generator and digital signal preprocessing circuit
are housed in one package. It is 100-pin QFP package.
The timing generator unit outputs the control pulse for the CCD horizontal and vertical
drive, the sampling pulse for the analog signal processing circuit and the synchronous
wave toward the compression record PCB.
The digital signal preprocessing circuit (DFE) unit corrects the digital clamp, etc. and
outputs the digital data toward the compression record PCB.
• CCD horizontal drive circuit
This is a drive circuit for CCD horizontal transmission.
• Analog signal processing circuit
Correlative double sampling is applied to a signal outputted from CCD and the
specified gain is applied to the signal by the programmable gain amplifier (PGA). A/D
conversion is done and the digital data is outputted to the digital signal preprocessing
circuit (DFE).
PGA in this unit changes sensitivity of the camera.
• EEPROM
The adjustment data of the image system (sensitivity, sensitivity ratio, defective pixels,
line crawl correction quantity, sensitivity F value dependence, etc.) are stored in
EEPROM.
• CCD sub voltage control circuit
This circuit controls the CCD sub straight voltage (V sub voltage) and adjusts the
saturation charge quantity of CCD.
• Power connecting connector
This 8-pin connector consists of +18V, -8V, +7V, +4V and four ground wires.
This connector is connected to the DCDC PCB with lead wire.
• CCD sub PCB connecting connector
This is a connecting connector with the CCD sub PCB and is a board-to-board
connector.
• Compression record PCB connector
This 37-pin flexible connector connects the CCD PCB to the compression record PCB.
② -2-2. CCD sub PCB
• CCD vertical drive circuit
This is a drive circuit for CCD vertical transmission.
• CCD PCB connecting connector
This is a connecting connector with the CCD PCB and is a board-to-board connector.
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VBA10201-R.3577.A