Datasheet

ADS8317
www.ti.com .................................................................................................................................................... SBAS356D –JUNE 2007–REVISED OCTOBER 2009
ELECTRICAL CHARACTERISTICS: V
DD
= +2.7V
At –40°C to +85°C, V
REF
= +1.25V, –IN = 1.25V, f
SAMPLE
= 200kHz, and f
CLK
= 24 × f
SAMPLE
, unless otherwise noted.
ADS8317I ADS8317IB
PARAMETER TEST CONDITIONS MIN TYP MAX MIN TYP MAX UNIT
ANALOG INPUT
Full-scale range FSR +IN – (–IN) –V
REF
V
REF
–V
REF
V
REF
V
Absolute input range +IN –0.1 V
DD
+ 0.1 –0.1 V
DD
+ 0.1 V
Hold 5 5 GΩ
Input resistance R
ON
Sampling 100 150 100 150 Ω
Input capacitance During sampling 24 24 pF
Input leakage current ±50 ±50 nA
Differential input capacitance +IN to –IN, during sampling 20 20 pF
Full-power bandwidth FSBW f
S
sinewave, SINAD = 60dB 1000 1000 kHz
DC ACCURACY
Resolution 16 16 Bits
No missing codes NMC 16 16 16 16 Bits
Integral linearity error INL –3 ±2 +3 –2 ±1.5 +2 LSB
Differential linearity error DNL –1 +1.5,–1 +2.5 –1 ±1 +2 LSB
Offset error V
OS
–2 ±1 +2 –1 ±0.5 +1 mV
Offset error drift TCV
OS
±0.4 ±0.4 μV/°C
Positive –32 ±16 +32 –32 ±16 +32 LSB
Gain error G
ERR
Negative –32 ±16 +32 –32 ±16 +32 LSB
Gain error drift TCG
ERR
±0.15 ±0.15 ppm/°C
Bipolar zero error –2 ±0.8 +2 –1 ±0.4 +1 mV
Bipolar zero error drift ±0.2 ±0.2 μV/°C
Noise 50 50 μVRMS
Power-supply rejection PSRR 2.7V ≤ V
DD
≤ 3.6V 1 1 LSB
SAMPLING DYNAMICS
Conversion time (16 DCLOCKs) t
CONV
24kHz ≤ f
CLK
≤ 4.8MHz 3.333 666.7 3.333 666.7 μs
Acquisition time (4.5 DCLOCKs) t
AQ
f
CLK
= 4.8MHz 0.9375 0.9375 μs
Throughput rate (22 DCLOCKs) 200 200 kSPS
Clock frequency 0.024 4.8 0.024 4.8 MHz
AC ACCURACY
2.5V
PP
sinewave at 2kHz –104 –107 dB
Total harmonic distortion THD
2.5V
PP
sinewave at 10kHz –101 –106 dB
2.5V
PP
sinewave at 2kHz 106 108 dB
Spurious-free dynamic range SFDR
2.5V
PP
sinewave at 10kHz 104 107 dB
2.5V
PP
sinewave at 2kHz 84.8 85 dB
Signal-to-noise ratio SNR
2.5V
PP
sinewave at 10kHz 84.8 85 dB
2.5V
PP
sinewave at 2kHz 84.7 84.9 dB
Signal-to-noise + distortion SINAD
2.5V
PP
sinewave at 10kHz 84.7 84.8 dB
2.5V
PP
sinewave at 2kHz 13.77 13.8 Bits
Effective number of bits ENOB
2.5V
PP
sinewave at 10kHz 13.77 13.79 Bits
VOLTAGE REFERENCE INPUT
Reference voltage 1 V
DD
/2 1 V
DD
/2 V
CS = GND, f
SAMPLE
= 0Hz 5 5 kΩ
Reference input resistance
CS = V
DD
5 5 GΩ
Reference input capacitance 20 20 pF
f
S
= 200kHz 9 14 9 14 μA
f
S
= 100kHz 3 5 3 5 μA
Reference input current
f
S
= 10kHz 0.5 1 0.5 1 μA
CS = V
DD
0.1 0.1 μA
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