Datasheet

AD7688
Rev. A | Page 3 of 28
SPECIFICATIONS
VDD = 4.5 V to 5.5 V, VIO = 2.3 V to VDD, V
REF
= VDD, T
A
= –40°C to +85°C, unless otherwise noted.
Table 2.
Parameter Conditions Min Typ Max Unit
RESOLUTION 16 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− 0 V
REF
/2 V
REF
/2 + 0.1 V
Analog Input CMRR f
IN
= 250 kHz 65 dB
Leakage Current at 25°C Acquisition phase 1 nA
Input Impedance See the Analog Input section
ACCURACY
No Missing Codes 16 Bits
Differential Linearity Error −1 ±0.4 +1 LSB
1
Integral Linearity Error −1.5 ±0.4 +1.5 LSB
Transition Noise REF = VDD = 5 V 0.4 LSB
Gain Error
2
, T
MIN
to T
MAX
±2 ±6 LSB
Gain Error Temperature Drift ±0.3 ppm/°C
Zero Error
2
, T
MIN
to T
MAX
±0.1 ±1.6 mV
Zero Temperature Drift ±0.3 ppm/°C
Power Supply Sensitivity
VDD = 5V ± 5%
±0.05 LSB
THROUGHPUT
Conversion Rate 0 500 kSPS
Transient Response Full-scale step 400 ns
AC ACCURACY
Dynamic Range V
REF
= 5 V 95.8 96.5 dB
3
Signal-to-Noise f
IN
= 20 kHz, V
REF
= 5 V 94 95.5 dB
f
IN
= 20 kHz, V
REF
= 5 V 92.5 dB
Spurious-Free Dynamic Range f
IN
= 20 kHz −118 dB
Total Harmonic Distortion f
IN
= 20 kHz −118 dB
Signal-to-(Noise + Distortion) f
IN
= 20 kHz, V
REF
= 5 V 93.5 95 dB
f
IN
= 20 kHz, V
REF
= 5 V, −60 dB input 36.5 dB
Intermodulation Distortion
4
115 dB
1
LSB means least significant bit. With the ±5 V input range, one LSB is 152.6 μV.
2
See the Terminology section. These specifications do include full temperature range variation but do not include the error contribution from the external reference.
3
All specifications in dB are referred to a full-scale input FS. Tested with an input signal at 0.5 dB below full-scale, unless otherwise specified.
4
f
IN1
= 21.4 kHz, f
IN2
= 18.9 kHz, each tone at −7 dB below full-scale.