參數(shù)資料
型號(hào)： TDA8757HL
廠商： NXP SEMICONDUCTORS
元件分類： ADC
英文描述： Triple 8-bit ADC 170 Msps
中文描述： 3-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP144
封裝： HEAT SINK, PLASTIC, LQFP-144
文件頁數(shù)： 18/37頁
文件大?。?/td> 895K
代理商： TDA8757HL
Philips Semiconductors
TDA8757
Triple 8-bit ADC 170 Msps
Preliminary data
Rev. 07 — 28 February 2002
18 of 37
9397 750 09457
Koninklijke Philips Electronics N.V. 2002. All rights reserved.
The default programmed value is:
Programmed code = 127
Clamp code = 0
ADC output = 0.
9.1.3
Coarse 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:
(3)
Where: V
ref
= 2.5 V.
The gain correspondence is given in
Table 6
. The gain is linear with reference to the
programming code (N
FINE
= 0).
The default programmed value is as follows:
N
COARSE
= 32
Gain = 0.825
V
i
to be full-scale = 1.212.
Table 5:
Programmed code
0
1
2
...
127
...
254
255
256
...
287
Coding
Clamp code
63.5
63
62.5
...
0
...
63.5
64
120
...
136
ADC output
underflow
0
...
63 or 64
64
120
...
136
Table 6:
N
COARSE
32
99
Typical gain correspondence (COARSE)
Gain
0.825
2.5
V
i
to be full-scale (V)
1.212
0.4
GAIN
N
1
+
V
ref
1
32
×
16
-----------------
–
-----------------------------------------------
16
-----
×
N
V
ref
.
512
N
FINE
–
)
------------------------------------------------
32
×
=
=
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