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| 型號： | EVAL-AD7725CBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 22/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR AD7725 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 900k |
| 數(shù)據(jù)接口： | 串行，并聯(lián) |
| 輸入范圍： | ±VREF |
| 在以下條件下的電源（標(biāo)準(zhǔn)）： | 615mW @ 900kSPS |
| 工作溫度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7725 |
| 已供物品： | 板，CD |
| 相關(guān)產(chǎn)品： | AD7725BSZ-ND - IC ADC 16BIT PROG 44MQFP |
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REV. A
AD7725
–3–
B Version
Parameter
Test Conditions/Comments
Min
Typ
Max
Unit
ALL LOGIC INPUTS
I
IN, Input Current
V
IN = 0 V to DVDD
±10
A
C
IN, Input Capacitance
10
pF
LOGIC OUTPUTS
V
OH, Output High Voltage
|I
OUT| = 200
A
4.0
V
OL, Output Low Voltage
|I
OUT| = 1.6 mA
0.4
V
POWER SUPPLIES
10
AV
DD
4.75
5.25
V
AI
DD
11
HALF_PWR = Logic High
12
28
33
mA
DV
DD
4.75
5.25
V
DI
DD
13
With the Filter in Figure 1
84
90
mA
Power Consumption
14
Standby Mode
30
mW
NOTES
1Operating temperature range is as follows: B Version: –40
°C to +85°C.
2f
CLKIN is the CLKIN frequency.
3See Terminology section.
4F
O = output data rate.
5When using the internal reference, THD and SFDR specifications apply only to input signals above 10 kHz with a 10
F decoupling capacitor between REF2 and
AGND2. At frequencies below 10 kHz, THD degrades to –80 dB and SFDR degrades to –83 dB.
6See Figures 23 and 24 for information regarding the number of filter taps allowed and the current consumption as the CLKIN frequency is varied.
7The AD7725 can operate with an external reference input in the range of 1.2 V to 3.15 V.
8Guaranteed by the design.
9Gain Error excludes reference error.
10All I
DD tests are done with the digital inputs equal to 0 V or DV DD.
11Analog current does not vary as the CLKIN frequency and the number of filter taps used in the postprocessor is varied.
12If HALF_PWR is logic low, AI
DD will typically double.
13Digital current varies as the CLKIN frequency and the number of filter taps used in the postprocessor is varied. See Figures 23 and 24.
14Digital 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
TTENU
A
TION
–
dB
100
150
200
250
–20
–40
–60
–100
–120
–80
116
Figure 1. Digital Filter Characteristics Used for Specifications
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