Datasheet

ADS8331
ADS8332
www.ti.com SBAS363C –DECEMBER 2009–REVISED MAY 2012
ELECTRICAL CHARACTERISTICS: VA = 5V
At T
A
= –40°C to +85°C, VA = 5V, VBD = 1.65V to 5V, V
REF
= 4.096V, and f
SAMPLE
= 500kSPS, unless otherwise noted.
ADS8331I, ADS8332I ADS8331IB, ADS8332IB
PARAMETER TEST CONDITIONS MIN TYP MAX MIN TYP MAX UNIT
ANALOG INPUT
Full-scale input voltage
(1)
IN
X
– COM, ADCIN – COM 0 V
REF
0 V
REF
V
IN
X
, ADCIN AGND – 0.2 VA + 0.2 AGND – 0.2 VA + 0.2 V
Absolute input voltage
COM AGND – 0.2 AGND + 0.2 AGND – 0.2 AGND + 0.2 V
Input capacitance ADCIN 40 45 40 45 pF
Input leakage current Unselected ADC input ±1 ±1 nA
SYSTEM PERFORMANCE
Resolution 16 16 Bits
No missing codes 16 16 Bits
INL Integral linearity –3 ±2 3 –2 ±1 2 LSB
(2)
DNL Differential linearity –1 ±1 2 –1 ±0.5 1.5 LSB
(2)
E
O
Offset error
(3)
–1 ±0.23 1 –1 ±0.23 1 mV
Offset error drift ±1 ±1 PPM/°C
Offset error matching –0.125 0.125 –0.125 0.125 mV
E
G
Gain error –0.25 –0.06 0.25 –0.25 –0.06 0.25 %FSR
Gain error drift ±0.02 ±0.02 PPM/°C
Gain error matching –0.003 0.003 –0.003 0.003 %FSR
Transition noise 30 30 μV RMS
PSRR Power-supply rejection ratio 78 78 dB
SAMPLING DYNAMICS
t
CONV
Conversion time 18 18 CCLK
t
SAMPLE1
Manual-Trigger mode 3 3 CCLK
Acquisition time
t
SAMPLE2
Auto-Trigger mode 3 3 CCLK
Throughput rate 500 500 kSPS
DYNAMIC CHARACTERISTICS
V
IN
= 4.096V
PP
at 1kHz –100 –100 dB
THD Total harmonic distortion
(4)
V
IN
= 4.096V
PP
at 10kHz –94 –95 dB
V
IN
= 4.096V
PP
at 1kHz 90.5 91.5 dB
SNR Signal-to-noise ratio
V
IN
= 4.096V
PP
at 10kHz 88 88 dB
V
IN
= 4.096V
PP
at 1kHz 90 91 dB
SINAD Signal-to-noise + distortion
V
IN
= 4.096V
PP
at 10kHz 87 87 dB
V
IN
= 4.096V
PP
at 1kHz 101 101 dB
SFDR Spurious-free dynamic range
V
IN
= 4.096V
PP
at 10kHz 96 96 dB
V
IN
= 4.096V
PP
at 1kHz 119 119 dB
Crosstalk
V
IN
= 4.096V
PP
at 100kHz 107 107 dB
IN
X
– COM with MUXOUT
22 22 MHz
tied to ADCIN
–3dB small-signal bandwidth
ADCIN – COM 40 40 MHz
(1) Ideal input span; does not include gain or offset error.
(2) LSB means least significant bit.
(3) Measured relative to an ideal full-scale input (IN
X
– COM) of 4.096V when VA = 5V.
(4) Calculated on the first nine harmonics of the input frequency.
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