Datasheet

ADS8331
ADS8332
www.ti.com SBAS363C –DECEMBER 2009–REVISED MAY 2012
ELECTRICAL CHARACTERISTICS: VA = 2.7V
At T
A
= –40°C to +85°C, VA = 2.7V, VBD = 1.65V to 2.7V, V
REF
= 2.5V, 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 2 LSB
(2)
DNL Differential linearity –1 ±0.6 2 –1 ±0.6 1.5 LSB
(2)
E
O
Offset error
(3)
–0.5 ±0.15 0.5 –0.5 ±0.15 0.5 mV
Offset error drift ±1 ±1 PPM/°C
Offset error matching –0.2 +0.2 –0.2 +0.2 mV
E
G
Gain error –0.25 –0.06 0.25 –0.25 –0.06 0.25 %FSR
Gain error drift ±0.4 ±0.4 PPM/°C
Gain error matching –0.003 0.003 –0.003 0.003 %FSR
Transition noise 28 28 μV RMS
PSRR Power-supply rejection ratio 74 74 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
= 2.5V
PP
at 1kHz –101 –101 dB
THD Total harmonic distortion
(4)
V
IN
= 2.5V
PP
at 10kHz –95 –95 dB
V
IN
= 2.5V
PP
at 1kHz 88 89 dB
SNR Signal-to-noise ratio
V
IN
= 2.5V
PP
at 10kHz 86.5 87.5 dB
V
IN
= 2.5V
PP
at 1kHz 87.5 88.5 dB
SINAD Signal-to-noise + distortion
V
IN
= 2.5V
PP
at 10kHz 86 87 dB
V
IN
= 2.5V
PP
at 1kHz 103 103 dB
SFDR Spurious-free dynamic range
V
IN
= 2.5V
PP
at 10kHz 98 98 dB
V
IN
= 2.5V
PP
at 1kHz 125 125 dB
Crosstalk
V
IN
= 2.5V
PP
at 100kHz 108 108 dB
IN
X
– COM with MUXOUT
17 17 MHz
tied to ADCIN
–3dB small-signal bandwidth
ADCIN – COM 30 30 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 2.5V when VA = 2.7V.
(4) Calculated on the first nine harmonics of the input frequency.
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