Datasheet

AD7643
Rev. 0 | Page 3 of 28
SPECIFICATIONS
AVDD = DVDD = 2.5 V; OVDD = 2.3 V to 3.6 V; V
REF
= 2.5 V; all specifications T
MIN
to T
MAX
, unless otherwise noted.
Table 2.
Parameter Conditions Min Typ Max Unit
RESOLUTION 18 Bits
ANALOG INPUT
Voltage Range V
IN+
− V
IN−
−V
REF
+V
REF
V
Operating Input Voltage V
IN+
, V
IN−
to AGND −0.1 AVDD
1
V
Analog Input CMRR f
IN
= 100 kHz 58 dB
Input Current 1.25 MSPS throughput 2.5 μA
Input Impedance
2
THROUGHPUT SPEED
Complete Cycle 800 ns
Throughput Rate 1.25 MSPS
DC ACCURACY
Integral Linearity Error
3
−3 ±1.5 +3 LSB
4
No Missing Codes 18 Bits
Differential Linearity Error −1 +1.25 LSB
Transition Noise V
REF
= 2.5 V 1.7 LSB
V
REF
= 2.048 V 2.0 LSB
Zero Error, T
MIN
to T
MAX
5
−16 +16 LSB
Zero Error Temperature Drift ±1 ppm/°C
Gain Error, T
MIN
to T
MAX
5
−22 +22 LSB
Gain Error Temperature Drift ±1 ppm/°C
Power Supply Sensitivity AVDD = 2.5 V ± 5% ±16 LSB
AC ACCURACY
Dynamic Range V
REF
= 2.5 V 95 dB
6
Signal-to-Noise f
IN
= 1 kHz, V
REF
= 2.5 V 93.5 dB
f
IN
= 20 kHz, V
REF
= 2.5 V 93.5 dB
f
IN
= 20 kHz, V
REF
= 2.048 V 92 dB
f
IN
= 100 kHz, V
REF
= 2.5 V 93 dB
Spurious-Free Dynamic Range f
IN
= 1 kHz, V
REF
= 2.5 V 118 dB
f
IN
= 20 kHz, V
REF
= 2.5 V 114 dB
f
IN
= 20 kHz, V
REF
= 2.048 V 111 dB
f
IN
= 100 kHz, V
REF
= 2.5 V 108 dB
Total Harmonic Distortion f
IN
= 1 kHz, V
REF
= 2.5 V −114 dB
f
IN
= 20 kHz, V
REF
= 2.5 V −113 dB
f
IN
= 20 kHz, V
REF
= 2.048 V −109 dB
f
IN
= 100 kHz, V
REF
= 2.5 V −105 dB
Signal-to-(Noise + Distortion) f
IN
= 1 kHz, V
REF
= 2.5 V 93.5 dB
f
IN
= 20 kHz, V
REF
= 2.5 V 93.5 dB
f
IN
= 20 kHz, V
REF
= 2.048 V 91.8 dB
f
IN
= 100 kHz, V
REF
= 2.5 V 92.5 dB
−3 dB Input Bandwidth 50 MHz
SAMPLING DYNAMICS
Aperture Delay 1 ns
Aperture Jitter 5 ps rms
Transient Response Full-scale step 250 ns
INTERNAL REFERENCE PDREF = PDBUF = low
Output Voltage REF @ 25°C 2.038 2.048 2.058 V
Temperature Drift −40°C to +85°C ±8 ppm/°C
Line Regulation AVDD = 2.5 V ± 5% ±15 ppm/V