Datasheet

REV. B–2–
AD7722–SPECIFICATIONS
1
(AV
DD
= AV
DD1
= 5 V  5%; DV
DD
= 5 V  5%; AGND = AGND1 = DGND = 0 V;
UNI = Logic Low or High; f
CLKIN
= 12.5 MHz; f
S
= 195.3 kSPS; REF2 = 2.5 V; T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
A Version
Parameter Test Conditions/Comments Min Typ Max Unit
DYNAMIC SPECIFICATIONS
2
Bipolar Mode, UNI = V
INH
V
CM
= 2.5 V, V
IN
(+) = V
IN
(–) =1.25 V p-p,
or V
IN
(–) = 1.25 V, V
IN
(+) = 0 V to 2.5 V
Signal-to-(Noise + Distortion)
3
Input Bandwidth 0 kHz–90.625 kHz 86/84.5 90 dB
Input Bandwidth 0 kHz–100 kHz, f
CLKIN
= 14 MHz 84.5/83 dB
Total Harmonic Distortion
3
Input Bandwidth 0 kHz–90.625 kHz –90/–88 dB
Input Bandwidth 0 kHz–100 kHz, f
CLKIN
= 14 MHz –88/–86 dB
Spurious-Free Dynamic Range Input Bandwidth 0 kHz–90.625 kHz –90 dB
Input Bandwidth 0 kHz–100 kHz, f
CLKIN
= 14 MHz –88 dB
Unipolar Mode, UNI = V
INL
V
IN
(–) = 0 V, V
IN
(+) = 0 V to 2.5 V
Signal-to-(Noise + Distortion)
3
Input Bandwidth 0 kHz–90.625 kHz 84.5/83 88 dB
Total Harmonic Distortion
3
Input Bandwidth 0 kHz–97.65 kHz –89/–87 dB
Spurious-Free Dynamic Range Input Bandwidth 0 kHz–97.65 kHz –90 dB
Intermodulation Distortion –93 dB
AC CMRR V
IN
(+) = V
IN
(–) = 2.5 V p-p
V
CM
= 1.25 V to 3.75 V, 20 kHz 96 dB
Digital Filter Response
Pass-Band Ripple 0 kHz to 90.625 kHz ±0.005 dB
Cutoff Frequency 96.92 kHz
Stop-Band Attenuation 104.6875 kHz to 12.395 MHz 90 dB
ANALOG INPUTS
Full-Scale Input Span V
IN
(+) – V
IN
(–)
Bipolar Mode UNI = V
INH
–V
REF2
/2 +V
REF2
/2 V
Unipolar Mode UNI = V
INL
0V
REF2
V
Absolute Input Voltage V
IN
(+) and V
IN
(–)0AV
DD
V
Input Sampling Capacitance 2pF
Input Sampling Rate Guaranteed by Design 2 × f
CLKIN
Hz
Differential Input Impedance 1/(4 × 10
-9
)f
CLKIN
kΩ
CLOCK
CLKIN Mark Space Ratio 45 55 %
REFERENCE
REF1 Output Voltage 2.32 2.47 2.62 V
REF1 Output Voltage Drift 60 ppm/°C
REF1 Output Impedance 3kΩ
Reference Buffer
Offset Voltage Offset between REF1 and REF2 ±12 mV
Using Internal Reference
REF2 Output Voltage 2.32 2.47 2.62 V
REF2 Output Voltage Drift 60 ppm/°C
Using External Reference
REF2 Input Impedance REF1 = AGND 1/(16 × 10
−9
)f
CLKIN
kΩ
External Reference Voltage Range Applied to REF1 or REF2 2.32 2.5 2.62 V
STATIC PERFORMANCE
Resolution 16 Bits
Differential Nonlinearity Guaranteed Monotonic ±0.5 ±1LSB
Integral Nonlinearity ±2LSB
After Calibration
Offset Error
4
±3mV
Gain Error
4, 5
±0.6 % FSR
Without Calibration
Offset Error ±6mV
Gain Error
5
±0.6 % FSR
Offset Error Drift ±1 LSB/°C
Gain Error Drift REF2 Is an Ideal Reference, REF1 = AGND
Unipolar Mode ±1 LSB/°C
Bipolar Mode ±0.5 LSB/°C