Datasheet

AD7986
Rev. B | Page 3 of 28
SPECIFICATIONS
AVDD = DVDD = 2.5 V, BVDD = 5 V, VIO = 1.8 V to 2.7 V, V
REF
= 4.096 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
= 500 kHz 100 dB
1
Leakage Current at 25°C Acquisition phase 250 nA
Input Impedance See the Analog Inputs section
ACCURACY
No Missing Codes 18 Bits
Differential Linearity Error −0.95 ±0.60 +1.50 LSB
2
Integral Linearity Error −2.50 ±1.00 +2.50 LSB
2
Transition Noise 2.0 LSB
2
Gain Error, T
MIN
to T
MAX
3
−20 ±2.4 +20 LSB
2
Gain Error Temperature Drift ±0.5 ppm/°C
Zero Error, T
MIN
to T
MAX
3
−0.8 +0.8 mV
Zero Temperature Drift ±0.3 ppm/°C
Power Supply Sensitivity AVDD = 2.5 V ± 5% ±4 LSB
2
THROUGHPUT
Conversion Rate 0 2.00 MSPS
Transient Response Full-scale step 100 ns
AC ACCURACY
Dynamic Range V
REF
= 4.096 V, internal reference 95.5 96.5 dB
1
V
REF
= 5.0 V, external reference 97 98
Signal-to-Noise Ratio, SNR f
IN
= 20 kHz, V
REF
= 4.096 V, internal
reference
94.5 95.5 dB
1
f
IN
= 20 kHz, V
REF
= 5.0 V, external
reference
96.5 97.0 dB
1
Spurious-Free Dynamic Range, SFDR f
IN
= 20 kHz −115 dB
1
Total Harmonic Distortion
4
, THD f
IN
= 20 kHz, V
REF
= 4.096 V, internal
reference
−113 dB
1
f
IN
= 20 kHz, V
REF
= 5.0 V, external
reference
−114 dB
1
Signal-to-(Noise + Distortion), SINAD f
IN
= 20 kHz, V
REF
= 4.096 V 94.5 95.5 dB
1
SAMPLING DYNAMICS
−3 dB Input Bandwidth 19 MHz
Aperture Delay 0.7 ns
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 ±4.096 V input range, one LSB is 31.25 µV.
3
See the 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.