Datasheet

ADS8322
www.ti.com SBAS215A –JULY 2001–REVISED JANUARY 2010
ELECTRICAL CHARACTERISTICS: +V
A
= +5V
At –40°C to +85°C, +V
A
= +5V, V
REF
= +2.5V, f
SAMPLE
= 500kHz, and f
CLK
= 20 • f
SAMPLE
, unless otherwise specified.
ADS8322Y ADS8322YB
(1)
PARAMETER TEST CONDITIONS MIN TYP MAX MIN TYP MAX UNIT
RESOLUTION
Resolution 16 16 Bits
ANALOG INPUTS
Full-scale input span
(2)
+IN – (–IN) 0 +2V
REF
0 +2V
REF
V
+IN –0.1 V
A
+ 0.1 –0.1 V
A
+ 0.1 V
Absolute input range
–IN –0.1 +0.5 –0.1 +0.5 V
Capacitance 25 25 pF
Leakage current ±1 ±1 nA
SYSTEM PERFORMANCE
No missing codes 14 15 Bits
Integral linearity error ±4 ±8 ±3 ±6 LSBs
(3)
Offset error ±1.0 ±2 ±0.5 ±1.0 mV
Gain error
(4)
±0.25 ±0.50 ±0.22 ±0.25 %FSR
Common-mode rejection ratio At dc 70 70 dB
Noise 60 60 μV
RMS
Power-supply rejection ratio At FFFFh output code ±3 ±3 LSBs
SAMPLING DYNAMICS
Conversion time 1.6 1.6 μs
Acquisition time 350 350 ns
Throughput rate 500 500 kHz
Aperture delay 50 50 ns
Aperture jitter 20 20 ps
Small-signal bandwidth 30 30 MHz
Step response 100 100 ns
DYNAMIC CHARACTERISTICS
Total harmonic distortion
(5)
V
IN
= 5V
PP
at 100kHz –90 –93 dB
SINAD V
IN
= 5V
PP
at 100kHz 81 83 dB
Spurious free dynamic range V
IN
= 5V
PP
at 100kHz 94 96 dB
REFERENCE OUTPUT
Voltage I
OUT
= 0 2.475 2.50 2.525 2.48 2.50 2.52 V
Source current Static load 10 10 μA
Drift I
OUT
= 0 20 20 ppm/°C
Line regulation 4.75V ≤ V
CC
≤ 5.25V 0.6 0.6 mV
REFERENCE INPUT
Range 1.5 2.55 1.5 2.55 V
Resistance
(6)
To internal reference voltage 10 10 kΩ
(1) Shaded cells indicate different specifications from ADS8322Y.
(2) Ideal input span; does not include gain or offset error.
(3) LSB means least significant bit, with V
REF
equal to +2.5V; 1LSB = 76μV.
(4) Measured relative to an ideal, full-scale input [+In – (–In)] of 4.9999V. Thus, gain error includes the error of the internal voltage
reference.
(5) Calculated on the first nine harmonics of the input frequency.
(6) Can vary ±30%.
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Product Folder Link(s): ADS8322