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參數資料
| 型號： | AD7676 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 16-Bit +-1 LSB INL, 500 kSPS, Differential ADC |
| 中文描述： | 16位-1 LSB INL和500 kSPS的，差分ADC |
| 文件頁數： | 11/20頁 |
| 文件大小： | 321K |
| 代理商： | AD7676 |
REV. 0
AD7676
–
11
–
TYPICAL CONNECTION DIAGRAM
Figure 5 shows a typical connection diagram for the AD7676.
Different circuitry shown on this diagram are optional and are
discussed below.
Analog Inputs
The AD7676 is specified to operate with a differential
±
2.5 V
range. The typical input impedance for each analog input range
is also shown.
IN+
IN
–
AGND
AVDD
R+ = 684
C
S
C
S
R
–
= 684
Figure 6. AD7676 Simplified Analog Input
Figure 6 shows a simplified analog input section of the AD7676.
The diodes shown in Figure 6 provide ESD protection for the
inputs. Care must be taken to ensure that the analog input sig-
nal never exceeds the absolute ratings on these inputs. This will
cause these diodes to become forward-biased and start conduct-
ing
current. These diodes can handle a forward-biased current
of 120 mA maximum. This condition could eventually occur
when the input buffer’s (U1) or (U2) supplies are different
from AVDD. In such case, an input buffer with a short-circuit
current limitation can be used to protect the part.
This analog input structure is a true differential structure. By
using these differential inputs, signals common to both inputs
are rejected as shown in Figure 7 which represents the typical
CMRR over frequency.
FREQUENCY
–
Hz
C
–
45
75
10k
10M
1k
1M
80
65
100k
55
85
70
60
50
40
Figure 7. Analog Input CMRR vs. Frequency
AVDD
AGND
DGND
DVDD
OVDD
OGND
SER/
PAR
CNVST
BUSY
SDOUT
SCLK
RD
CS
RESET
PD
REFGND
C
REF
2.5V REF
NOTE 1
REF
100
D
CLOCK
AD7676
C/ P/DSP
SERIAL PORT
DIGITAL SUPPLY
(3.3V OR 5V)
ANALOG
SUPPLY
(5V)
DVDD
OB/
2C
NOTE 7
BYTESWAP
DVDD
50k
100nF
1M
IN+
ANALOG INPUT+
C
C
2.7nF
U1
+
NOTE 4
NOTE 5
50
AD8021
–
15
NOTE 2
NOTE 3
NOTE 5
ADR421
10 F
100nF
+
10 F
100nF
+
100nF
+
10 F
IN
–
ANALOG INPUT
–
C
C
2.7nF
U2
+
NOTE 4
NOTE 5
50
AD8021
–
15
50
+
1 F
NOTES
1. SEE VOLTAGE REFERENCE INPUT SECTION.
2. WITH THE RECOMMENDED VOLTAGE REFERENCES, C
IS 47 F. SEE CHAPTER VOLTAGE REFERENCE INPUT SECTION
3. OPTIONAL CIRCUITRY FOR HARDWARE GAIN CALIBRATION.
4. THE AD8021 IS RECOMMENDED. SEE DRIVER AMPLIFIER CHOICE SECTION.
5. SEE ANALOG INPUT SECTION.
6. OPTION, SEE POWER SUPPLY SECTION
7. OPTIONAL LOW JITTER
CNVST
, SEE CONVERSION CONTROL SECTION.
Figure 5. Typical Connection Diagram. (
±
2.5 V Range Shown)
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