Datasheet

Data Sheet AD7988-1/AD7988-5
Rev. D | Page 3 of 24
SPECIFICATIONS
VDD = 2.5 V, VIO = 2.3 V to 5.5 V, V
REF
= 5 V, T
A
= –40°C to +125°C, unless otherwise noted.
Table 2.
Parameter Test Conditions/Comments Min Typ Max Unit
RESOLUTION 16 Bits
ANALOG INPUT
Voltage Range IN+ − IN− 0 V
REF
V
Absolute Input Voltage
IN+
−0.1
V
REF
+ 0.1
V
IN− −0.1 +0.1 V
Analog Input CMRR f
IN
= 1 kHz 60 dB
Leakage Current at 25°C Acquisition phase 1 nA
Input Impedance See the Analog Inputs section
ACCURACY
No Missing Codes 16 Bits
Differential Linearity Error V
REF
= 5 V −0.9 ±0.4 +0.9 LSB
1
V
REF
= 2.5 V ±0.55 LSB
1
Integral Linearity Error
V
REF
= 5 V
−1.25
±0.6
+1.25
LSB
1
V
REF
= 2.5 V ±0.65 LSB
1
Transition Noise V
REF
= 5 V 0.6 LSB
1
V
REF
= 2.5 V 1.0 LSB
1
Gain Error, T
MIN
to T
MAX
2
±2 LSB
1
Gain Error Temperature Drift
±0.35
ppm/°C
Zero Error, T
MIN
to T
MAX
2
−0.5 ±0.08 +0.5 mV
Zero Temperature Drift 0.54 ppm/°C
Power Supply Sensitivity VDD = 2.5 V ± 5% ±0.1 LSB
1
THROUGHPUT
AD7988-1
Conversion Rate
VIO ≥ 2.3 V up to 85°C, VIO ≥ 3.3 V above 85°C up to
125°C
0 100 kSPS
Transient Response Full-scale step 500 ns
AD7988-5
Conversion Rate
VIO ≥ 2.3 V up to 85°C, VIO ≥ 3.3 V above 85°C up to
125°C
0 500 kSPS
Transient Response Full-scale step 400 ns
AC ACCURACY
Dynamic Range V
REF
= 5 V 92 dB
3
V
REF
= 2.5 V 87 dB
3
Oversampled Dynamic Range f
O
= 10 kSPS 111 dB
3
Signal-to-Noise Ratio, SNR f
IN
= 10 kHz, V
REF
= 5 V 90 91 dB
3
f
IN
= 10 kHz, V
REF
= 2.5 V 86.5 dB
3
Spurious-Free Dynamic Range, SFDR f
IN
= 10 kHz −110 dB
3
Total Harmonic Distortion, THD f
IN
= 10 kHz −114 dB
3
Signal-to-(Noise + Distortion), SINAD f
IN
= 10 kHz, V
REF
= 5 V 91.5 dB
3
f
IN
= 10 kHz, V
REF
= 2.5 V 87.0 dB
3
1
LSB means least significant bit. With the 5 V input range, 1 LSB is 76.3 µV.
2
See the Terminology section. These specifications include full temperature range variation, but not the error contribution from the external reference.
3
All specifications in dB are referred to a full-scale input FSR. Tested with an input signal at 0.5 dB below full scale, unless otherwise specified.