cxd1179q Sony Electronics, cxd1179q Datasheet - Page 10

• Manufacturer Part Number: cxd1179q
• Description: 8-bit 35msps Video A/d Converter With Clamp Function
• Manufacturer: Sony Electronics

Operation (See Block Diagram and Timing Chart 3)
1. The CXD1179Q is a 2-step parallel system A/D converter featuring a 4-bit upper comparators group and 2
lower comparators groups of 4-bit each. The reference voltage that is equal to the voltage between VRT –
VRB/16 is constantly applied to the upper 4-bit comparator block. Voltage that corresponded to the upper
data is fed through the reference supply to the lower data. VRTS and VRBS pins serve for the self
generation of VRT (Reference voltage top) and VRB (Reference voltage bottom).
Lower comparators A block
Lower comparators B block
Upper comparators block
Lower reference voltage
External clock
Lower data A
Lower data B
Digital output
Analog input
Upper data
H (0)
S (1)
S (1)
LD (–2)
Out (–2)
MD (0)
Vi (1)
RV (0)
C (1)
C (0)
Timing Chart 3
LD (–1)
H (1)
—10—
S (2)
S (2)
Out (–1)
MD (1)
Vi (2)
RV (1)
C (2)
C (1)
LD (0)
H (2)
S (3)
S (3)
Out (0)
MD (2)
Vi (3)
RV (2)
C (3)
C (2)
LD (1)
H (3)
S (4)
S (4)
Out (1)
MD (3)
Vi (4)
RV (3)
LD (2)
C (4)
C (3)
H (4)
CXD1179Q