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| 型号： | TDA8757AHL/21 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | ADC |
| 英文描述： | 3-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP144 |
| 封装： | PLASTIC, HLQFP-144 |
| 文件页数： | 10/37页 |
| 文件大小： | 908K |
| 代理商： | TDA8757AHL/21 |
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Philips Semiconductors
TDA8757A
Triple 8-bit ADC 205 Msps
Preliminary data
Rev. 01 — 22 March 2002
18 of 37
9397 750 09549
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 ne register. The coarse register programming
equation is as follows:
(3)
Where: Vref = 2.5 V.
The gain correspondence is given in Table 6. The gain is linear with reference to the
programming code (NFINE = 0).
The default programmed value is as follows:
NCOARSE =32
Gain = 0.825
Vi to be full-scale = 1.212.
Table 5:
Coding
Programmed code
Clamp code
ADC output
0
63.5
underow
1
63
2
62.5
...
127
0
...
254
63.5
63 or 64
255
64
256
120
...
287
136
Table 6:
Typical gain correspondence (COARSE)
NCOARSE
Gain
Vi to be full-scale (V)
32
0.825
1.212
99
2.5
0.4
GAIN
N
COARSE
1
+
V
ref
1
N
FINE
32
16
×
------------------
–
------------------------------------------------
1
16
------
×
N
COARSE
1
+
V
ref . 512
N
FINE
–
()
------------------------------------------------
32
×
==
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