Datasheet

AD7682/AD7689 Data Sheet
Rev. D | Page 4 of 32
SPECIFICATIONS
VDD = 2.3 V to 5.5 V, VIO = 1.8 V to VDD, V
REF
= VDD, all specifications T
MIN
to T
MAX
, unless otherwise noted.
Table 2.
AD7689A AD7682B/AD7689B
Parameter Conditions/Comments
Min Typ Max Min Typ Max
Unit
RESOLUTION 16 16 Bits
ANALOG INPUT
Voltage Range Unipolar mode 0 +V
REF
0 +V
REF
V
Bipolar mode −V
REF
/2 +V
REF
/2 −V
REF
/2 +V
REF
/2
Absolute Input Voltage Positive input, unipolar
and bipolar modes
−0.1 V
REF
+ 0.1 −0.1 V
REF
+ 0.1 V
Negative or COM input,
unipolar mode
−0.1 +0.1 −0.1 +0.1 V
Negative or COM input,
bipolar mode
V
REF
/2 − 0.1 V
REF
/2 V
REF
/2 + 0.1 V
REF
/2 − 0.
1
V
REF
/2 V
REF
/2 + 0.1 V
Analog Input CMRR f
IN
= 250 kHz 68 68 dB
Leakage Current at 25°C Acquisition phase 1 1 nA
Input Impedance
1
THROUGHPUT
Conversion Rate
Full Bandwidth
2
VDD = 4.5 V to 5.5 V 0 250 0 250 kSPS
VDD = 2.3 V to 4.5 V 0 200 0 200 kSPS
¼ Bandwidth
2
VDD = 4.5 V to 5.5 V 0 62.5 0 62.5 kSPS
VDD = 2.3 V to 4.5 V 0 50 0 50 kSPS
Transient Response Full-scale step,
full bandwidth
1.8 1.8 s
Full-scale step,
¼ bandwidth
14.5 14.5 s
ACCURACY
No Missing Codes 15 16 Bits
Integral Linearity Error −4 +4 −1.5 ±0.4 +1.5 LSB
3
Differential Linearity Error −1 ±0.25 +1.5 LSB
Transition Noise REF = VDD = 5 V 0.6 0.5 LSB
Gain Error
4
−32 +32 −8 ±1 +8 LSB
Gain Error Match ±2 −4 ±0.5 +4 LSB
Gain Error Temperature Drift ±1 ±1 ppm/°C
Offset Error
4
VDD = 4.5 V to 5.5 V −32 +32 −8 ±1 +8 LSB
VDD = 2.3 V to 4.5 V ±32 ±5 LSB
Offset Error Match ±2 −4 ±0.5 +4 LSB
Offset Error Temperature Drift ±1 ±1 ppm/°C
Power Supply Sensitivity VDD = 5 V ± 5% ±1.5 ±1.5 LSB
AC ACCURACY
5
Dynamic Range 90.5 93.8 dB
6
Signal-to-Noise f
IN
= 20 kHz, V
REF
= 5 V 90 92.5 93.5 dB
f
IN
= 20 kHz, V
REF
= 4.096 V,
internal REF
89 91 92.3 dB
f
IN
= 20 kHz, V
REF
= 2.5 V,
internal REF
86 87.5 88.8 dB
SINAD f
IN
= 20 kHz, V
REF
= 5 V 89 91 92.5 dB
f
IN
= 20 kHz, V
REF
= 5 V,
−60 dB input
30.5 33.5 dB
f
IN
= 20 kHz, V
REF
= 4.096 V
internal REF
88 90 91 dB
f
IN
= 20 kHz, V
REF
= 2.5 V
internal REF
86 87 88.4 dB