Datasheet

ADS8517
www.ti.com ................................................................................................................................................. SLAS527A – SEPTEMBER 2008 – REVISED JUNE 2009
ELECTRICAL CHARACTERISTICS (continued)
At T
A
= -40 ° C to +85 ° C, f
S
= 200 kHz, V
DIG
= V
ANA
= 5 V, using internal reference (see Figure 39 ), unless otherwise noted.
ADS8517I ADS8517IB
(1)
PARAMETER TEST CONDITIONS MIN TYP MAX MIN TYP MAX UNIT
THROUGHPUT SPEED
Conversion time 2.5 2.5 µ s
Complete cycle Acquire and convert 5 5 µ s
Throughput rate 200 200 kHz
DC ACCURACY
INL Integral linearity error – 3 3 – 1.5 1.5 LSB
(2)
DNL Differential linearity error – 2 3 – 1 1.5 LSB
No missing codes 15 16 Bits
Transition noise
(3)
0.9 0.8 LSB
Gain error ± 0.2 ± 0.1 %
Internal reference – 0.75 0.75 – 0.75 0.75 %
Full-scale error
(4)
External 2.5-V reference – 0.75 0.75 – 0.75 0.75 %
Internal reference ± 9 ± 9 ppm/ ° C
Full-scale error drift
External 2.5-V reference ± 1 ± 1 ppm/ ° C
BPZ Bipolar zero error ± 10 V range – 5 ± 1 5 – 2 ± 1 2 mV
Bipolar zero error drift ± 10 V range ± 0.6 ± 0.6 ppm/ ° C
UPZ Unipolar zero error 0 V to 5 V, 0 V to 4 V ranges – 3 ± 0.1 3 – 2 ± 0.1 2 mV
Unipolar zero error drift 0 V to 5 V, 0 V to 4 V ranges ± 0.15 ± 0.15 ppm/ ° C
Recovery time to rated accuracy
2.2- µ F capacitor to CAP 1 1 ms
from power down
(5)
+4.75 V < V
ANA
< +5.25 V – 8 +8 – 6 +6
Power-supply sensitivity
LSB
(V
DIG
= V
ANA
= V
S
)
+4.5 V < V
ANA
< +5.5 V – 20 +20 – 12 +12
AC ACCURACY
SFDR Spurious-free dynamic range f
IN
= 10 kHz, ± 10 V 92 100 96 101 dB
(6)
THD Total harmonic distortion f
IN
= 10 kHz, ± 10 V – 97 – 92 – 98 – 95 dB
f
IN
= 10 kHz, ± 10 V 85 88 87 88.5
SINAD Signal-to-(noise+distortion) dB
– 60 dB Input 29 29
SNR Signal-to-noise ratio f
IN
= 10 kHz, ± 10 V 85 88 88 89 dB
SNR usable bandwidth
(7)
f
IN
= 10 kHz, ± 10 V 130 130 kHz
SNR full-power bandwidth ( – 3 dB) f
IN
= 10 kHz, ± 10 V 600 600 kHz
SAMPLING DYNAMICS
Aperture delay 40 40 ns
Aperture jitter 20 20 ps
Transient response FS step 5 5 µ s
Overvoltage recovery
(8)
750 750 ns
(2) LSB means Least Significant Bit. One LSB for the ± 10 V input range is 305 µ V.
(3) Typical rms noise at worst-case transitions.
(4) Full-scale error is the worst case of – Full Scale or +Full Scale untrimmed deviation from ideal first and last code transitions, divided by
the transition voltage (not divided by the full-scale range) and includes the effect of offset error.
(5) This is the time delay after the ADS8517 is brought out of Power-Down mode until all internal settling occurs and the analog input is
acquired to rated accuracy. A Convert command after this delay will yield accurate results.
(6) All specifications in dB are referred to a full-scale input.
(7) Usable bandwidth defined as full-scale input frequency at which Signal-to-(Noise + Distortion) degrades to 60 dB.
(8) Recovers to specified performance after 2 x FS input overvoltage.
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