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參數(shù)資料
| 型號(hào)： | AD7677ASTRL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類(lèi)： | ADC |
| 英文描述： | 16-Bit, 1 LSB INL, 1 MSPS Differential ADC |
| 中文描述： | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, PQFP48 |
| 封裝： | LQFP-48 |
| 文件頁(yè)數(shù)： | 12/20頁(yè) |
| 文件大小： | 322K |
| 代理商： | AD7677ASTRL |
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REV. 0
AD7677
–12–
Transfer Functions
Using the OB/
2C
digital input, the AD7677 offers two output
codings: straight binary and two’s complement. The ideal trans-
fer characteristic for the AD7677 is shown in Figure 4.
000...000
000...001
000...010
111...101
111...110
111...111
ANALOG INPUT
+FS
–
1.5 LSB
+FS
–
1 LSB
–
FS + 1 LSB
–
FS
–
FS + 0.5 LSB
A
–
Figure 4. ADC Ideal Transfer Function
TYPICAL CONNECTION DIAGRAM
Figure 5 shows a typical connection diagram for the AD7677.
Different circuitry shown on this diagram are optional and are
discussed below.
Analog Inputs
Figure 6 shows a simplified analog input section of AD7677.
IN+
IN
–
AGND
AVDD
R+ = 168
C
S
C
S
R
–
= 168
Figure 6. 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 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.
DVDD
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
AD7677
C/ P/DSP
SERIAL PORT
DIGITAL SUPPLY
(3.3V OR 5V)
ANALOG
SUPPLY
(5V)
DVDD
OB/
2C
NOTE 7
BYTESWAP
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
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