Datasheet

AD7621
Rev. 0 | Page 3 of 32
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 16 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 55 dB
Input Current 3 MSPS throughput 25 μA
Input Impedance
2
THROUGHPUT SPEED
Complete Cycle Wideband warp, warp modes 333 ns
Throughput Rate Wideband warp, warp modes 0.001 3 MSPS
Time Between Conversions Wideband warp, warp modes 1 ms
Complete Cycle Normal mode 500 ns
Throughput Rate Normal mode 0 2 MSPS
Complete Cycle Impulse mode 800 ns
Throughput Rate Impulse mode 0 1.25 MSPS
DC ACCURACY All modes
Integral Linearity Error
3
V
REF
= 2.048 V, PDREF = high −2 ±1 +2 LSB
4
No Missing Codes V
REF
= 2.048 V, PDREF = high 16 Bits
Differential Linearity Error V
REF
= 2.048 V, PDREF = high −1 +2 LSB
Transition Noise V
REF
= 2.5 V 0.69 LSB
Transition Noise V
REF
= 2.048 V 0.82 LSB
Zero Error, T
MIN
to T
MAX
5
−30 +30 LSB
Zero Error Temperature Drift ±1 ppm/°C
Gain Error, T
MIN
to T
MAX
5
−0.38 +0.38 % of FSR
Gain Error Temperature Drift ±2 ppm/°C
Power Supply Sensitivity AVDD = 2.5 V ± 5% ±3 LSB
AC ACCURACY
Dynamic Range f
IN
= 20 kHz, V
REF
= 2.5 V 90.5 dB
6
Signal-to-Noise f
IN
= 20 kHz, V
REF
= 2.5 V 88 90 dB
f
IN
= 20 kHz, V
REF
= 2.048 V 86 88 dB
f
IN
= 100 kHz, V
REF
= 2.5 V 89.2 dB
Spurious-Free Dynamic Range f
IN
= 20 kHz 103 dB
f
IN
= 100 kHz 101 dB
Total Harmonic Distortion f
IN
= 20 kHz –102 dB
f
IN
= 100 kHz −100 dB
Signal-to-(Noise + Distortion) f
IN
= 20 kHz, V
REF
= 2.5 V 87.5 89.8 dB
f
IN
= 20 kHz, V
REF
= 2.048 V 87.5 dB
f
IN
= 100 kHz, V
REF
= 2.5 V 89 dB
–3 dB Input Bandwidth 50 MHz
SAMPLING DYNAMICS
Aperture Delay 1 ns
Aperture Jitter 5 ps rms
Transient Response Full-scale step 50 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 ±7 ppm/°C
Line Regulation AVDD = 2.5 V ± 5% ±15 ppm/V