Datasheet

AD7686
Rev. B | 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.
B Grade C Grade
Parameter Conditions Min Typ Max Min Typ Max Unit
RESOLUTION 16 16 Bits
ANALOG INPUT
Voltage Range IN+ − IN− 0 V
REF
0 V
REF
V
Absolute Input Voltage IN+ −0.1 VDD + 0.1 −0.1 VDD + 0.1 V
IN− −0.1 +0.1 −0.1 +0.1 V
Analog Input CMRR f
IN
= 200 kHz 65 65 dB
Leakage Current @ 25°C Acquisition phase 1 1 nA
Input Impedance
See the
Analog Input
section
See the Analog Input
section
ACCURACY
No Missing Codes 16 16 Bits
Differential Linearity Error −1 ±0.7 −1 ±0.5 +1.5 LSB
1
Integral Linearity Error −3 ±1 +3 −2 ±0.6 +2 LSB
1
Transition Noise REF = VDD = 5 V 0.5 0.45 LSB
1
Gain Error
2
, T
MIN
to T
MAX
±2 ±8 ±2 ±6 LSB
1
Gain Error Temperature Drift ±0.3 ±0.3 ppm/°C
Offset Error
2
, T
MIN
to T
MAX
±0.1 ±1.6 ±0.1 ±1.6 mV
Offset Temperature Drift ±0.3 ±0.3 ppm/°C
Power Supply Sensitivity
VDD = 5 V ± 5%
±0.05 ±0.05 LSB
1
THROUGHPUT
Conversion Rate 0 500 0 500 kSPS
Transient Response Full-scale step 400 400 ns
AC ACCURACY
Signal-to-Noise Ratio f
IN
= 20 kHz, V
REF
= 5 V 89 92 91 92.7 dB
3
f
IN
= 20 kHz, V
REF
= 2.5 V 87.5 88 dB
2
Spurious-Free Dynamic Range f
IN
= 20 kHz −106 −110 dB
2
Total Harmonic Distortion f
IN
= 20 kHz −106 −110 dB
2
Signal-to-(Noise + Distortion) f
IN
= 20 kHz, V
REF
= 5 V 89 92 91 92.5 dB
2
f
IN
= 20 kHz, V
REF
= 5 V, −60 dB input 32 33.5 dB
2
Intermodulation Distortion
4
−110 −115 dB
2
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 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 FSR. 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.