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參數(shù)資料
| 型號(hào)： | AD7265BCP |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | Low-Jitter, Precision Clock Generator with Three Outputs |
| 中文描述： | DUAL 3-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, QCC32 |
| 封裝： | LEAD FREE, MO-220-VHHD-2, LFCSP-32 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 706K |
| 代理商： | AD7265BCP |
AD7265
Preliminary Technical Data
TRANSFER FUNCTIONS
The designed code transitions occur at successive integer LSB
values (i.e., 1 LSB, 2 LSB, and so on). The LSB size is V
REF
/4096.
The ideal transfer characteristic for the AD7265 when straight
binary coding is output is shown in Figure 6, and the ideal
transfer characteristic for the AD7265 when twos complement
coding is output is shown in Figure 7.
0
000...000
111...111
1LSB = V
REF
/4096
1LSB
V
REF
– 1LSB
ANALOG INPUT
A
0V
000...001
000...010
111...110
111...000
011...111
Figure 6. Straight Binary Transfer Characteristic
0
100...000
011...111
1LSB = 2
×
V
REF
/4096
+V
REF
– 1 LSB
–V
REF
+ 1LSB V
REF
– 1LSB
ANALOG INPUT
A
100...001
100...010
011...110
000...001
000...000
111...111
Figure 7. Twos Complement Transfer Characteristic with V
REF
±V
REF
Input
Range
DIGITAL INPUTS
The digital inputs applied to the AD7265 are not limited by the
maximum ratings that limit the analog inputs. Instead, the
digital inputs applied can go to 7 V and are not restricted by the
V
DD
+ 0.3 V limit as on the analog inputs. See the Absolute
Maximum Ratings. Another advantage of SCLK, RANGE,
A0–A2, and CS not being restricted by the V
DD
+ 0.3 V limit is
that power supply sequencing issues are avoided. If one of these
digital inputs is applied before V
DD
, there is no risk of latch-up,
as there would be on the analog inputs if a signal greater than
0.3 V were applied prior to V
DD
.
V
DRIVE
The AD7265 also has the V
DRIVE
feature, which controls the
voltage at which the serial interface operates. V
DRIVE
allows the
ADC to easily interface to both 3 V and 5 V processors. For
example, if the AD7265 was operated with a V
DD
of 5 V, the
V
DRIVE
pin could be powered from a 3 V supply, allowing a large
dynamic range with low voltage digital processors. For example,
the AD7265 could be used with the 2 × V
REF
input range, with a
V
DD
of 5 V while still being able to interface to 3 V digital parts.
Rev. PrA | Page 12 of 16
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