saa7167ah NXP Semiconductors, saa7167ah Datasheet - Page 8

• Manufacturer Part Number: saa7167ah
• Description: Saa7167 Yuv-to-rgb Digital-to-analog Converter
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Voltage output amplifiers
Before the analog input enters the analog mixers, it passes
through voltage output amplifiers. Level shifters are used
internally to provide an offset of 0.2 V and an amplifier gain
of 2 for analog inputs to match with the output levels from
DACs. After buffering with voltage output amplifiers, the
final RGB outputs can drive a 150
internal resistor, 47
load resistor) at the monitor side (see Fig.9).
I
Only one control byte is needed for the SAA7167AH. The I
Table 6 I
Notes
1. S = START condition.
2. SLAVE ADDRESS = 1011111X; X = R/W control bit. X = 0: order to write. X = 1: order to read (not used for
3. A = acknowledge; generated by the slave.
4. SUBADDRESS = subaddress byte.
5. DATA = data byte.
6. P = STOP condition.
Table 7 Control data byte
2004 Jun 29
2
S
C-bus control
(1)
YUV-to-RGB digital-to-analog
converter
SUBADDRESS
SAA7167AH).
00
01
02
2
SLAVE ADDRESS
C-bus format
external serial resistor, and 75
KMOD2
KD7
D7
0
(2)
KMOD1
load directly (25
A
KD6
D6
(3)
0
SUBADDRESS
KMOD0
KD5
D5
0
2
8
C-bus format is shown in Table 6.
The output voltage level of DAC ranges from the lowest
level 0.2 V (zero code) to the highest level 1.82 V (all one
code).
With the digital input YUV video data in accordance with
ITU-R BT.601, the RGB output of 8-bit DAC actually
ranges from the 16th step (black) to the 235th step (white).
Therefore, after the voltage divider with external serial
resistor and monitor load resistor, the output voltage range
to a monitor is approximately 0.7 V (p-p).
DRP
KD4
D4
(4)
0
A
(3)
KEN
KD3
D3
0
DATA
(5)
KDLY2
KINV
KD2
D2
FMTC1
SAA7167AH
KDLY1
Product specification
KD1
D1
A
(3)
FMTC0
KDLY0
P
KD0
D0
(6)