tda8754el/27 NXP Semiconductors, tda8754el/27 Datasheet - Page 25

• Manufacturer Part Number: tda8754el/27
• Description: Triple High Speed Adc For Lcd Drive
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 14984
Product data sheet
9.4 Coarse registers (R, G and B)
Table 19:
The coarse gain of the AGC is controlled with 7 bits. The code gain can vary from
32 to 95; see
Table 20:
Table 21:
Table 22:
Value
:
086h
087h
Bit
COARSER (address: 01h)
7
6 to 0
COARSEG (address: 04h)
7
6 to 0
COARSEB (address: 07h)
7
6 to 0
Value
32
33
:
63
64
65
:
69
Register
COARSER (01h)
COARSEG (04h)
COARSEB (07h)
Reset
OR8 OR7 OR6 OR5 OR5 OR3 OR2 OR1 OR0 Clamp
OG8 OG7 OG6 OG5 OG4 OG3 OG2 OG1 OG0
OB8 OB7 OB6 OB5 OB4 OB3 OB2 OB1 OB0
0
0
Symbol
OR8
CR[6:0]
OG8
CG[6:0]
OB8
CB[6:0]
CR6 CR5 CR4 CR3 CR2 CR1 CR0 V
CG6 CG5 CG4 CG3 CG2 CG1 CG0
CB6 CB5 CB4 CB3 CB2 CB1 CB0
Coding for clamp level and ADC output
Coarse gain registers (01h, 04h, 07h) bit allocation with reset
Coarse gain registers (01h, 04h, 07h) bit description
Coarse register
0
0
0
1
1
1
Table
1
1
1
1
1
0
0
0
22.
0
0
OG8
OR8
OB8
Rev. 06 — 16 June 2005
0
0
1
0
0
0
7
0
Description
offset R channel; MSB bit of offset value
coarse gain of the AGC for R channel
offset G channel; MSB bit of offset value
coarse gain of the AGC for G channel
offset B channel; MSB bit of offset value
coarse gain of the AGC for B channel
0
0
0
0
1
0
0
0
CG6
CR6
CB6
6
1
0
0
0
0
1
0
0
1
0
0
CR5
CG5
CB5
0
0
1
0
0
0
5
0
1
1
0
1
1
0
1
1
CG4
CR4
CB4
Triple 8-bit video ADC up to 270 Msps
…continued
4
0
1.000
0.992
:
0.753
0.746
0.738
:
0.706
1
1
i
(full-scale)
0
1
CR3
CG3
CB3
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
3
0
code
(decimal)
:
134
135
CG2
CR2
CB2
2
1
Gain ADC
1.000
1.008
:
1.328
1.340
1.355
:
1.416
TDA8754
ADC output
(code transition)
:
134/135
135/136
CG1
CR1
CB1
1
1
25 of 57
CR0
CG0
CB0
0
0