Datasheet
ADS8326
www.ti.com
.................................................................................................................................................. SBAS343C –MAY 2007–REVISED SEPTEMBER 2009
ELECTRICAL CHARACTERISTICS: V
DD
= +2.7V
At –40°C to +85°C, V
REF
= +2.5V, –IN = GND, f
SAMPLE
= 200kHz, and f
DCLOCK
= 24 × f
SAMPLE
, unless otherwise noted.
ADS8326I ADS8326IB
PARAMETER TEST CONDITIONS MIN TYP MAX MIN TYP MAX UNIT
ANALOG INPUT
Full-scale range FSR +IN – (–IN) 0 V
REF
0 V
REF
V
Operating common-mode signal –0.3 0.5 –0.3 0.5 V
–IN = GND, off 5 5 GΩ
Input resistance R
ON
–IN = GND, on 100 150 100 150 Ω
Input capacitance –IN = GND, during sampling 48 48 pF
Input leakage current –IN = GND ±50 ±50 nA
Differential input capacitance +IN to –IN, during sampling 20 20 pF
FS sinewave, SINAD =
Full-power bandwidth FSBW 60 60 kHz
–60dB
DC ACCURACY
Resolution 16 16 Bits
No missing codes NMC 16 16 Bits
Integral linearity error INL –3 ±2 +3 –2.5 ±1 +2.5 LSB
Differential linearity error DNL –1 ±0.5 +2 –1 ±0.4 +1 LSB
Offset error V
OS
–1.5 ±0.75 +1.5 –1 ±0.5 +1 mV
Offset error drift TCV
OS
±0.2 ±0.2 ppm/°C
Gain error G
ERR
±33 ±16 LSB
Gain error drift TCG
ERR
±0.3 ±0.3 ppm/°C
Noise 30 30 μVRMS
Power-supply rejection 2.7V ≤ V
DD
≤ 3.6V 0.5 0.5 LSB
SAMPLING DYNAMICS
Conversion time
t
CONV
24kHz ≤ f
DCLOCK
≤ 4.8MHz 3.333 666.7 3.333 666.7 μs
(16 DCLOCKs)
Acquisition time
t
AQ
f
DCLOCK
= 4.8MHz 0.9375 0.9375 μs
(4.5 DCLOCKs)
Throughput rate
200 200 kSPS
(22 DCLOCKs)
Clock frequency f
DCLOCK
0.024 4.8 0.024 4.8 MHz
AC ACCURACY
2.5V
PP
sinewave at 2kHz –88 –88.5 dB
Total harmonic distortion THD
2.5V
PP
sinewave at 10kHz –75 –75.5 dB
2.5V
PP
sinewave at 2kHz 91 91.5 dB
Spurious-free dynamic
SFDR
range
2.5V
PP
sinewave at 10kHz 77.5 78 dB
2.5V
PP
sinewave at 2kHz 86.5 87 dB
Signal-to-noise ratio SNR
2.5V
PP
sinewave at 10kHz 86 86.5 dB
2.5V
PP
sinewave at 2kHz 85 85.5 dB
Signal-to-noise + distortion SINAD
2.5V
PP
sinewave at 10kHz 74.5 75 dB
2.5V
PP
sinewave at 2kHz 13.86 13.94 Bits
Effective number of bits ENOB
2.5V
PP
sinewave at 10kHz 12.12 12.20 Bits
VOLTAGE REFERENCE INPUT
Reference voltage 0.1 V
DD
0.1 V
DD
V
CS = GND, f
SAMPLE
= 0Hz 5 5 GΩ
Reference input resistance
CS = V
DD
5 5 GΩ
Reference input capacitance 24 24 pF
f
S
= 200kHz 70 90 70 90 μA
f
S
= 100kHz 25 33 25 33 μA
Reference input current
f
S
= 10kHz 5 7 5 7 μA
CS = V
DD
0.1 0.1 μA
Copyright © 2007–2009, Texas Instruments Incorporated Submit Documentation Feedback 5
Product Folder Link(s): ADS8326