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參數資料
| 型號： | AD7725 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 16-Bit 900 kSPS ADC with a Programmable Postprocessor |
| 中文描述： | 16位900 ksps模數轉換器的可編程后處理器 |
| 文件頁數： | 3/28頁 |
| 文件大小： | 442K |
| 代理商： | AD7725 |
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REV. A
AD7725
–3–
B Version
Typ
Parameter
Test Conditions/Comments
Min
Max
Unit
ALL LOGIC INPUTS
I
IN
, Input Current
C
IN
, Input Capacitance
LOGIC OUTPUTS
V
OH
, Output High Voltage
V
OL
, Output Low Voltage
POWER SUPPLIES
10
AV
DD
AI
DD
DV
DD
DI
Power Consumption
14
V
IN
= 0 V to DV
DD
±
10
μ
A
pF
10
|I
OUT
| = 200
μ
A
|I
OUT
| = 1.6 mA
4.0
V
V
0.4
4.75
5.25
33
5.25
90
V
mA
V
mA
mW
11
HALF_PWR = Logic High
12
28
4.75
13
With the Filter in Figure 1
Standby Mode
84
30
NOTES
1
Operating temperature range is as follows: B Version: –40
°
C to +85
°
C.
2
f
is the CLKIN frequency.
3
See Terminology section.
4
F
= output data rate.
5
When using the internal reference, THD and SFDR specifications apply only to input signals above 10 kHz with a 10
μ
F decoupling capacitor between REF2 and
AGND2. At frequencies below 10 kHz, THD degrades to –80 dB and SFDR degrades to –83 dB.
6
See Figures 23 and 24 for information regarding the number of filter taps allowed and the current consumption as the CLKIN frequency is varied.
7
The AD7725 can operate with an external reference input in the range of 1.2 V to 3.15 V.
8
Guaranteed by the design.
9
Gain Error excludes reference error.
10
All I
tests are done with the digital inputs equal to 0 V or DV
.
11
Analog current does not vary as the CLKIN frequency and the number of filter taps used in the postprocessor is varied.
12
If HALF_PWR is logic low, AI
will typically double.
13
Digital current varies as the CLKIN frequency and the number of filter taps used in the postprocessor is varied. See Figures 23 and 24.
14
Digital inputs static and equal to 0 V or DV
DD
.
Specifications subject to change without notice.
CUTOFF FREQUENCY = 50kHz
STOP-BAND FREQUENCY = 116kHz
NUMBER OF FILTER TAPS USED IN
THE POSTPROCESSOR = 108
OUPUT DATA RATE = CLKIN/16
FREQUENCY – kHz
0
–140
0
300
50
A
100
150
200
250
–20
–40
–60
–100
–120
–80
116
Figure 1. Digital Filter Characteristics Used for Specifications
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