ADS8318 Datasheet, PDF (3/28 Pages) Texas Instruments – 16-BIT, 500-KSPS, SERIAL INTERFACE MICROPOWER, MINIATURE, SAR ANALOG-TO-DIGITAL CONVERTER

ADS8318
www.ti.com ........................................................................................................................................................................................................ SLAS568 – MAY 2008
SPECIFICATIONS
T_A = –40°C to 85°C, +VA = 5 V, +VBD = 5 V to 2.375 V, V_ref = 4 V, f_SAMPLE = 500 kHz (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
ANALOG INPUT
Full-scale input span ⁽¹⁾
Operating input range
Input common-mode range
Input capacitance
+IN – (–IN)
+IN
–IN
+IN and -IN terminal to GND
–V_ref
– 0.1
– 0.1
0
V_ref/2
59
V_ref
V_ref + 0.1
V_ref + 0.1
V_ref/2+0.1
Input leakage current
During acquisition
1000
SYSTEM PERFORMANCE
Resolution
16
No missing codes
16
ADS8318I
INL
Integral linearity⁽²⁾
ADS8318IB
–1.5
±0.65
1.5
–1
±0.65
1
DNL
ADS8318I
Differential linearity
At 16-bit level
ADS8318IB
–1
±0.4
1
–0.75
±0.4
0.75
E_O
Offset error⁽⁴⁾
–1.5
±0.3
1.5
E_G
Gain error
–0.03
±0.003
0.03
CMRR Common-mode rejection ratio
With common mode input signal = 200 mV_p-p at 500
kHz
78
PSRR Power supply rejection ratio
At FFF0h output code
80
Transition noise
0.25
SAMPLING DYNAMICS
t_CONV Conversion time
+VBD = 5 V
+VBD = 3 V
1400
1400
+VBD = 5 V
600
Acquisition time
+VBD = 3 V
600
Maximum throughput rate with or
without latency
0.5
Aperture delay
2.5
Aperture jitter, RMS
6
Step response
600
Settling to 16-bit accuracy
Overvoltage recovery
600
(1) Ideal input span, does not include gain or offset error.
(2) This is endpoint INL, not best fit.
(3) LSB means least significant bit
(4) Measured relative to actual measured reference.
UNIT
V
V
pF
pA
Bits
Bits
LSB ⁽³⁾
LSB ⁽³⁾
mV
%FSR
dB
dB
LSB
ns
ns
MHz
ns
ps
ns
ns
Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): ADS8318
Submit Documentation Feedback
3