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ADS8508IBDWG4 Datasheet(PDF) 3 Page - Texas Instruments

No. de pieza ADS8508IBDWG4
Descripción Electrónicos  12-BIT 250-KSPS SERIAL CMOS SAMPLING ANALOG-TO-DIGITAL CONVERTER
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Fabricante Electrónico  TI1 [Texas Instruments]
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ADS8508IBDWG4 Datasheet(HTML) 3 Page - Texas Instruments

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ADS8508
SLAS433 – SEPTEMBER 2005
ELECTRICAL CHARACTERISTICS (continued)
At T
A = -40°C to 85°C, fs = 250 kHz, VDIG = VANA = 5 V, using internal reference and fixed resistors (See Figure 28 and
Figure 29) (unless otherwise specified)
ADS8508IB
PARAMETER
TEST CONDITIONS
UNIT
MIN
TYP
MAX
±10 V range
Int. Ref. with 0.1% external fixed
-0.5
0.5
Full-scale
%FS
resistors
error(4)(5)
All other ranges
-0.5
0.5
Full-scale error drift
Int. Ref.
±7
ppm/°C
±10 V range
Ext. Ref. with 0.1% external fixed
-0.5
0.5
Full-scale
%FS
resistors
error(4)(5)
All other ranges
-0.5
0.5
Full-scale error drift
Ext. Ref.
±2
ppm/°C
Bipolar zero error(4)
-1
1
mV
Bipolar zero error drift
±0.4
ppm/°C
10 V range
-5
5
Unipolar zero
mV
4 V and 5 V
-3
3
error(4)
range
Unipolar zero error drift
±2
ppm/°C
Recovery to rated accuracy after
1-µF Capacitor to CAP
1
ms
power down
Power supply sensitivity
-0.5
0.5
+4.75 V < VD < +5.25 V
LSB
(VDIG = VANA = VD)
AC ACCURACY
SFDR
Spurious-free dynamic range
fI = 45 kHz
86
95
dB(6)
THD
Total harmonic distortion
fI = 45 kHz
-95
-86
dB
SINAD
fI = 45 kHz
72
73
dB
Signal-to-(noise+distortion)
–60-dB Input
32
dB
SNR
Signal-to-noise ratio
fI = 45 kHz
72
73
dB
Full-power bandwidth(7)
500
kHz
SAMPLING DYNAMICS
Aperture delay
5
ns
Transient response
FS Step
2
µs
Overvoltage recovery(8)
150
ns
REFERENCE
Internal reference voltage
No load
2.48
2.5
2.52
V
Internal reference source current
1
µA
(must use external buffer)
Internal reference drift
8
ppm/°C
External reference voltage range for
2.3
2.5
2.7
V
specified linearity
External reference current drain
Ext. 2.5-V Ref.
100
µA
DIGITAL INPUTS
Logic levels
VIL
Low-level input voltage
-0.3
0.8
V
VIH
High-level input voltage
2.0
VDIG +0.3 V
V
(4)
As measured with circuit shown in Figure 28 and Figure 29. Adjustable to zero with external potentiometer. Factory calibrated with 0.1%,
0.25-W resistors.
(5)
For bipolar input ranges, full-scale error is the worst case of -full-scale or +full-scale uncalibrated 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. For unipolar input
ranges, full-scale error is the deviation of the last code transition divided by the transition voltage. It also includes the effect of offset
error.
(6)
All specifications in dB are referred to a full-scale ±10-V input.
(7)
Full-power bandwidth is defined as the 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.
3


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