ADS8381 Datasheet, PDF (3/35 Pages) Texas Instruments – 18-BIT, 580-kHz, UNIPOLAR INPUT, MICRO POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE

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ADS8381
SLAS364D − APRIL 2002 − REVISED FEBRUARY 2005
SPECIFICATIONS
TA = −40°C to 85°C, +VA = 5 V, +VBD = 3 V or 5 V, Vref = 4.096 V, fSAMPLE = 580 kHz (unless otherwise noted)
PARAMETER
TEST
CONDITIONS
ADS8381IB
MIN
TYP
MAX
ADS8381I
MIN
TYP
MAX
Analog Input
Full-scale input voltage (see Note 1)
Absolute input voltage
+IN − −IN
+IN
−IN
0
−0.2
−0.2
Vref
Vref + 0.2
0.2
0
−0.2
−0.2
Vref
Vref + 0.2
0.2
Input capacitance
45
45
Input leakage current
1
1
System Performance
Resolution
18
18
No missing codes
18
17
< 0.125 FS
−4 −2.2/1
4
−5
5
Integral linearity (see Notes 2 and 3)
> 0.125 FS
−5
−3/2
5
−6
6
Differential linearity
−1 −0.6/1.25
2
−2
3
Offset error
−0.75
±0.25
0.75
−1
±0.5
1
Gain error (see Note 4)
−0.075
0.075
−0.1
0.1
Noise
60
60
Power supply rejection ratio
At 3FFFFh
output code
75
75
Sampling Dynamics
Conversion time
1.4
1.4
Acquisition time
0.3
0.3
Throughput rate
580
580
Aperture delay
4
4
Aperture jitter
15
15
Step response
150
150
Over voltage recovery
150
150
(1) _{Ideal input span, does not include gain or offset error.}
(2) _{LSB means least significant bit}
(3) _{This is endpoint INL, not best fit.}
(4) _{Measured relative to an ideal full-scale input (+IN − −IN) of 4.096 V}
UNIT
V
V
pF
nA
Bits
Bits
LSB
(18 bit)
LSB
(18 bit)
mV
%FS
µV RMS
dB
µs
µs
kHz
ns
ps
ns
ns
3