AD977 Datasheet, PDF (15/24 Pages) Analog Devices – 16-Bit, 100 kSPS/200 kSPS BiCMOS A/D Converter

AD977/AD977A
Table III. Output Codes and Ideal Input Voltages
Description
Analog Input
Full-Scale Range
Least Significant Bit
+Full Scale (FS–1 LSB)
Midscale
One LSB Below Midscale
–Full Scale
± 10 V
305 µV
9.999695 V
0V
–305 µV
–10 V
±5 V
153 µV
4.999847 V
0V
–153 µV
–5 V
± 3.33 V
0 V to 10 V
102 µV
153 µV
3.333231 V 9.999847 V
0V
5V
–102 µV 4.999847 V
–3.333333 V 0 V
0 V to 5 V
76 µV
4.999924 V
2.5 V
2.499924 V
0V
Digital Output
Two’s Complement Straight Binary
(SB/BTC LOW)
(SB/BTC HIGH)
0 V to 4 V
61 µV
3.999939 V
2V
1.999939 V
0V
0111 1111 1111 1111
0000 0000 0000 0000
1111 1111 1111 1111
1000 0000 0000 0000
1111 1111 1111 1111
1000 0000 0000 0000
0111 1111 1111 1111
0000 0000 0000 0000
AD977
Input Range
–9.890 V to 9.90 V
–4.943 V to 4.995 V
–3.295 V to 3.330 V
0.008 V to 9.946 V
0.004 V to 5.023 V
0.003 V to 4.010 V
Table IV. Input Ranges, Offset and Full-Scale Errors Without External Resistors
Offset Error
A/B/C Grade
± 25 mV/±25 mV
± 25 mV/±25 mV
± 25 mV/±25 mV
± 10 mV/±10 mV
± 10 mV/±10 mV
± 10 mV/±10 mV
Full-Scale Error
A/B/C Grade
± 0.75%/± 0.50%
± 0.75%/± 0.50%
± 0.75%/± 0.50%
± 0.75%/± 0.50%
± 0.75%/± 0.50%
± 0.75%/± 0.50%
AD977A
Input Range
–9.800 V to 9.970 V
–4.900 V to 4.985 V
–3.267 V to 3.323 V
0.007 V to 9.893 V
0.004 V to 5.039 V
0.003 V to 4.016 V
Offset Error
A/B/C Grade
± 40 mV/±40 mV
± 40 mV/±40 mV
± 40 mV/±40 mV
± 10 mV/±10 mV
± 10 mV/±10 mV
± 10 mV/±10 mV
Full-Scale Error
A/B/C Grade
± 0.80%/± 0.55%
± 0.80%/± 0.55%
± 0.80%/± 0.55%
± 0.75%/± 0.50%
± 0.75%/± 0.50%
± 0.75%/± 0.50%
200
V_IN
100
R1_IN
AGND1
R2_IN
33.2k
AD8031
2.2 F
R3_IN
CAP
AD977A
2.2 F
REF
AGND2
200
100
V_IN
R1_IN
AGND1
R2_IN
33.2k
AD8031
2.2 F
R3_IN
CAP
AD977A
2.2 F
REF
AGND2
200
V_IN
100
33.2k
AD8031
2.2 F
2.2 F
R1_IN
AGND1
R2_IN
R3_IN
CAP
AD977A
REF
AGND2
a.
b.
c.
Figure 11. AD977A Bipolar Input Configuration Using the Internal Reference; (a) V_IN = ±10 V, (b) V_IN = ±5 V, (c) V_IN = ±3.33 V
REV. D
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