HD49351BP Renesas Electronics Corporation., HD49351BP Datasheet - Page 20

• Manufacturer Part Number: HD49351BP
• Description: Cds/pga & 10-bit A/d Tg Converter
• Manufacturer: Renesas Electronics Corporation.

HD49351BP/HBP
• Gray code (D8 to D12 of address H’F4)
Rev.1.0, Jul 06, 2004, page 20 of 28
ADC output code can be change to following type by differential code gray SW (D9, D8).
Differential code and gray code are recommended for this countermeasure. Figure 10 indicates circuit block. When
luminance signal changes are smoothly, the number of bit of switching digital output bit can be reduced and easily
to reduce the ripple using this function. This function is especially effective for longer the settings of sensor more
than clk = 30 MHz, and ADC output.
Figure 12 indicates the timing specifications.
Standard
Phase (D10)
0
1
0
1
Note: Color filter is different1 in the number of pixels with odd number
Binary code at D8: 0, Gray code at D8: 1
Normal at D9: 0, differential code at D9: 1
and even number therefore first 2 pixcels should be standard.
ADCLK
OBP
Digital output
From ADC
Standard data
control signal
(D10, D11)
ADC
(In case of select the positive polar)
Standard
Phase (D11)
0
0
1
1
Standard data
control signal
10
Differential SW(D9)
(1) Complex differential coded
Figure 12 Complex Circuit Example at the DSP Side
Figure 11 Timing Specification of Differential Code
Figure 10 Differential Code and Gray Code Circuit
Convert
Gray Binary
Differential data
2clk_DL
Standard Data Output timing at
Selecting the Differential Code
Third and fourth
Fourth and fifth
Fifth and sixth
Sixth and seventh
(In case of select the positive edge of ADCLK with D12)
Carry bit
rounding
Carry bit
rounding
+
(Beginning edge of OBP and standard edge of ADCLK should be exept ±5 ns)
1
2
Standard
data
selector
2clk
delay
Standard
data
selector
Standard
3
data
4
Gray SW(D8)
• adck phase (D12): ADCK polar to OBP
5
When 0: Select positive edge
When 1: Select negative edge
(2) Convert Gray
Convert
Gray Binary
6
Differential data
D11
D10
D9
D0
7
8
10
Binary
Output
D11
D10
D9
D0