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參數資料
| 型號： | AD7675 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 16-Bit, 100 kSPS, Differential ADC |
| 中文描述： | 16位，100 kSPS的，差分ADC |
| 文件頁數： | 11/20頁 |
| 文件大小： | 399K |
| 代理商： | AD7675 |
REV. 0
AD7675
–
11
–
TYPICAL CONNECTION DIAGRAM
Figure 5 shows a typical connection diagram for the AD7675.
Different circuitry shown on this diagram are optional and are
discussed below.
Analog Inputs
Figure 6 shows a simplified analog input section of the AD7675.
IN+
IN
–
AGND
AVDD
R+ = 684
C
S
C
S
R
–
= 684
Figure 6. AD7675 Simplified Analog Input
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 conducting
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 cur-
rent 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
AD7675
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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