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參數(shù)資料
| 型號： | ML2264 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | 4-Channel High-Speed 8-Bit A/D Converter with T/H (S/H)(具有跟蹤/保持（采樣/保持）電路的四通道8位高速A/D轉(zhuǎn)換器) |
| 中文描述： | 4通道高速8位A / D轉(zhuǎn)換器的T / H（上的S /高）（具有跟蹤/保持（采樣/保持）電路的四通道8位高速的A / D轉(zhuǎn)換器） |
| 文件頁數(shù)： | 11/17頁 |
| 文件大?。?/td> | 307K |
| 代理商： | ML2264 |
ML2264
11
1.4 REFERENCE
The +V
REF
and –V
REF
inputs are the reference voltages that
determine the full scale and zero input voltages,
respectively, for the A/D converter. Thus, +V
REF
defines
the analog input which produces a full scale output and
–V
REF
defines the analog input which produces an output
code of all zeroes. The transfer function for the A/D
converter is shown in Figure 10.
+V
REF
and –V
REF
can be set to any voltage between GND
and V
CC
. This means that the reference voltages can be
offset from GND and the difference between +V
REF
+ and
–V
REF
– can be made small to increase the resolution of the
conversion. Note that the total unadjusted error increases
when [+V
REF
– (–V
REF
)] decreases.
1.5 POWER SUPPLY AND REFERENCE DECOUPLING
A 0.1μF ceramic disc capacitor is recommended to bypass
V
CC
to GND, using as short a lead length as possible.
If REF+ and REF– inputs are driven by long lines, they
should be bypassed by 0.1μF ceramic disc capacitors at
the reference input pins.
Figure 9. Operating Sequence (WR-RD Mode)
ACQUISITION
OR SAMPLING
PERIOD. ALL
COMPARATORS
AUTOZEROED.
MSB
COMPARATORS
DECIDING.
LSB
COMPARATORS
DECIDING.
WR
CONVERSION
STARTS.
V
IN
SAMPLING
ENDS. HOLD
TIME STARTS.
MSB
COMPARATOR
RESULTS ARE
LATCHED.
RD BROUGHT LOW
LATCHES LSB
COMPARATOR
RESULTS AND
BRINGS INT LOW.
(a) T/H Mode
(a) S/H Mode
ALL
COMPARATORS
AUTOZEROED.
ACQUISITION
PERIOD. MSB
COMPARATORS
ARE TRACKING
V
IN
. LSB
COMPARATORS
ARE SAMPLING
V
IN
.
LSB
COMPARATORS
DECIDING.
WR
CONVERSION
STARTS.
V
IN
SAMPLING
ENDS. MSB
COMPARATOR
RESULTS ARE
LATCHED.
RD BROUGHT LOW
LATCHES LSB
COMPARATOR
RESULTS AND
BRINGS INT LOW.
Figure 10. A/D Transfer Characteristic
FULL SCALE
TRANSITION
OUTPUT
CODE
11111111
11111110
11111101
00000011
00000010
00000001
00000000
0
1
2
3
FS
FS – 1LSB
A
IN
, INPUT VOLTAGE (IN TERMS OF LSB’S)
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