參數(shù)資料
型號: TDA8752BH
廠商: NXP Semiconductors N.V.
英文描述: Triple high-speed Analog-to-Digital Converter 110 Msps ADC
中文描述: 三高速模擬數(shù)字轉(zhuǎn)換器110 MSPS的ADC的
文件頁數(shù): 18/36頁
文件大小: 154K
代理商: TDA8752BH
2000 Jan 10
18
Philips Semiconductors
Preliminary specification
Triple high-speed Analog-to-Digital
Converter 110 Msps (ADC)
TDA8752B
O
FFSET REGISTER
This register controls the clamp level for the
RGB channels. The relationship between the
programmingcodeandtheleveloftheclampcodeisgiven
in Table 2.
Table 2
Coding
The default programmed value is:
Programmed code = 127
Clamp code = 0
ADC output = 0.
C
OARSE AND FINE REGISTERS
These two registers enable the gain control, the AGC gain
with the coarse register and the reference voltage with the
fine register. The coarse register programming equation is
as follows:
Where: V
ref
= 2.5 V.
The gain correspondence is given in Table 3. The gain is
linear with reference to the programming code (N
FINE
= 0).
Table 3
Gain correspondence (COARSE)
The default programmed value is as follows:
N
COARSE
= 32
Gain = 0.825
V
i
to be full-scale = 1.212.
To modulate this gain, the fine register is programmed
using the above equation. With a full-scale ADC input, the
fine register resolution is a
1
2
LSB peak-to-peak
(see Table 4 for N
COARSE
= 32).
Table 4
Gain correspondence (FINE)
The default programmed value is: N
FINE
= 0.
C
ONTROL REGISTER
COAST and HSYNC signals can be inverted by setting the
I
2
C-bus control bits V level and H level respectively. When
V level and H level are set to zero respectively, COAST
and HSYNC are active HIGH.
The bit ‘edge’ defines the rising or falling edge of CKREF
to synchronise the PLL. It will be on the rising edge if the
bit is at logic 0 and on the falling edge if the bit is at logic 1.
The bits Up and Do are used for the test, to force the
charge pump current. These bits have to be logic 0 during
normal use.
The bits Ip0, Ip1 and Ip2 control the charge pump current,
to increase the bandwidth of the PLL, as shown in Table 5.
PROGRAMMED
CODE
CLAMP CODE
ADC OUTPUT
0
1
2
63.5
63
62.5
0
63.5
64
120
136
underflow
127
254
255
256
287
0
63 or 64
64
120
136
GAIN
N
1
+
V
ref
1
×
1
FINE
16
32
-------------------------N
16
×
N
ref
512
(
+
)
V
32
×
=
=
N
COARSE
GAIN
V
i
TO BE
FULL-SCALE
32
99
0.825
2.5
1.212
0.4
N
FINE
GAIN
V
i
TO BE
FULL-SCALE
0
31
0.825
0.878
1.212
1.139
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