Datasheet

Data Sheet AD7631
Rev. B | Page 3 of 32
SPECIFICATIONS
AVDD = DVDD = 5 V; OVDD = 2.7 V to 5.5 V; VCC = 15 V; VEE = −15 V; V
REF
= 5 V; all specifications T
MIN
to T
MAX
, unless otherwise noted.
Table 2.
Parameter Conditions/Comments Min Typ Max Unit
RESOLUTION 18 Bits
ANALOG INPUTS
Differential Voltage Range, V
IN
(V
IN+
) − (V
IN−
)
0 V to 5 V V
IN
= 10 V p-p −V
REF
+V
REF
V
0 V to 10 V V
IN
= 20 V p-p −2 V
REF
+2 V
REF
V
±5 V V
IN
= 20 V p-p −2 V
REF
+2 V
REF
V
±10 V V
IN
= 40 V p-p −4 V
REF
+4 V
REF
V
Operating Voltage Range V
IN+
, V
IN−
to AGND
0 V to 5 V −0.1 +5.1 V
0 V to 10 V −0.1 +10.1 V
±5 V −5.1 +5.1 V
±10 V −10.1 +10.1 V
Common-Mode Voltage Range V
IN+
, V
IN−
5 V V
REF
/2 − 0.1 V
REF
/2 V
REF
/2 + 0.1 V
10 V V
REF
− 0.2 V
REF
V
REF
+ 0.2 V
Bipolar Ranges −0.1 0 +0.1 V
Analog Input CMRR f
IN
= 100 kHz 75 dB
Input Current 250 kSPS throughput 80
1
µA
Input Impedance
See
Analog Inputs section
THROUGHPUT SPEED
Complete Cycle 4.0 µs
Throughput Rate 250 kSPS
DC ACCURACY
Integral Linearity Error
2
250 kSPS throughput −2.5 ±1.5 +2.5 LSB
3
No Missing Codes 18 Bits
Differential Linearity Error
2
−1 +2.5 LSB
Transition Noise 0.75 LSB
Unipolar Zero Error −0.06 +0.06 %FS
Bipolar Zero Error −0.03 +0.03 %FS
Zero-Error Temperature Drift ±0.5 ppm/°C
Bipolar Full-Scale Error −0.09 +0.09 %FS
Unipolar Full-Scale Error −0.07 +0.07 %FS
Full-Scale Error Temperature Drift ±0.5 ppm/°C
Power Supply Sensitivity AVDD = 5 V ± 5% 3 LSB
AC ACCURACY
Dynamic Range V
IN
= 0 to 5 V, f
IN
= 2 kHz, −60 dB 100 101.8 dB
4
V
IN
= all other input ranges, f
IN
= 2 kHz, −60 dB 100 102.5 dB
Signal-to-Noise Ratio V
IN
= 0 to 5 V, f
IN
= 2 kHz 99.5 100.5 dB
V
IN
= all other input ranges, f
IN
= 2 kHz 100 101 dB
Signal-to-(Noise + Distortion), SINAD f
IN
= 2 kHz 100 dB
Total Harmonic Distortion f
IN
= 2 kHz 112 dB
Spurious-Free Dynamic Range f
IN
= 2 kHz 113 dB
−3 dB Input Bandwidth V
IN
= 0 V to 5 V 45 MHz
SAMPLING DYNAMICS
Aperture Delay 2 ns
Aperture Jitter 5 ps rms
Transient Response Full-scale step 500 ns