Datasheet

AD7984
Rev. A | Page 3 of 24
SPECIFICATIONS
VDD = 2.5 V, VIO = 2.3 V to 5.5 V, REF = 5 V, T
A
= −40°C to +85°C, unless otherwise noted.
Table 2.
Parameter Conditions Min Typ Max Unit
RESOLUTION 18 Bits
ANALOG INPUT
Voltage Range IN+ − IN− −V
REF
+V
REF
V
Absolute Input Voltage IN+, IN− −0.1 V
REF
+ 0.1 V
Common-Mode Input Range IN+, IN− V
REF
× 0.475 V
REF
× 0.5 V
REF
× 0.525 V
Analog Input CMRR f
IN
= 450 kHz 67 dB
1
Leakage Current at 25°C Acquisition phase 200 nA
Input Impedance See the Analog Inputs section
ACCURACY
No Missing Codes 18 Bits
Differential Linearity Error −1 +1.5 LSB
2
Integral Linearity Error −2.25 +2.25 LSB
2
Transition Noise 0.95 LSB
2
Gain Error, T
MIN
to T
MAX
3
−0.075 ±0.022 +0.075 % of FS
Gain Error Temperature Drift −0.6 ppm/°C
Zero Error, T
MIN
to T
MAX
3
−700 ±100 +700 μV
Zero Temperature Drift 0.3 ppm/°C
Power Supply Sensitivity
VDD = 2.5 V ± 5%
90 dB
1
THROUGHPUT
Conversion Rate 0 1.33 MSPS
Transient Response Full-scale step 290 ns
AC ACCURACY
Dynamic Range V
REF
= 5 V 99.7 dB
1
Signal-to-Noise, SNR f
IN
= 1 kHz, V
REF
= 5 V, T
A
= 25°C 96.5 98.5 dB
1
Spurious-Free Dynamic Range, SFDR f
IN
= 10 kHz 112.5 dB
1
Total Harmonic Distortion
4
, THD f
IN
= 10 kHz −110.5 dB
1
Signal-to-(Noise + Distortion), SINAD f
IN
= 10 kHz, V
REF
= 5 V, T
A
= 25°C 98 dB
1
1
All specifications expressed in decibels are referred to a full-scale input FSR and tested with an input signal at 0.5 dB below full scale, unless otherwise specified.
2
LSB means least significant bit. With the ±5 V input range, one LSB is 38.15 μV.
3
See Terminology section. These specifications include full temperature range variation but not the error contribution from the external reference.
4
Tested fully in production at f
IN
= 1 kHz.