Datasheet

ADS8528
ADS8548
ADS8568
SBAS543A AUGUST 2011 REVISED OCTOBER 2011
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ELECTRICAL CHARACTERISTICS: ADS8548
All minimum/maximum specifications are at T
A
= 40°C to +125°C, specified supply voltage range, VREF = 2.5V (internal),
V
IN
= ±10V, and f
DATA
= max, unless otherwise noted. Typical values are at T
A
= +25°C, HVDD = 15V, HVSS = 15V,
AVDD = 5V, and DVDD = 3.3V.
ADS8548
PARAMETER CONDITIONS MIN TYP MAX UNIT
SAMPLING DYNAMICS
Conversion time Internal conversion clock 1.45 μs
Serial interface, all four SDOx active 450 kSPS
Throughput rate f
DATA
Parallel interface 600 kSPS
DC ACCURACY
Resolution 14 Bits
No missing codes 14 Bits
Integral linearity error
(1)
INL 1 ±0.5 1 LSB
Differential linearity error DNL 1 ±0.25 1 LSB
Offset error 1.5 ±0.5 1.5 mV
Offset error matching 0.65 0.65 mV
Offset error drift ±3.5 μV/°C
Gain error Referenced to voltage at REFIO 0.5 ±0.25 0.5 %
Between channels of any pair 0.2 0.2 %
Gain error matching
Between any two channels 0.4 0.4 %
Gain error drift Referenced to voltage at REFIO ±6 ppm/°C
AC ACCURACY
Signal-to-noise ratio SNR At f
IN
= 10kHz 84 85 dB
Signal-to-noise ratio + distortion SINAD At f
IN
= 10kHz 83 84 dB
Total harmonic distortion
(2)
THD At f
IN
= 10kHz 91 86 dB
Spurious-free dynamic range SFDR At f
IN
= 10kHz 86 92 dB
Channel-to-channel isolation At f
IN
= 10kHz 120 dB
In 4VREF mode 48 MHz
3dB small-signal bandwidth BW
In 2VREF mode 24 MHz
(1) Integral nonlinearity is defined as the maximum deviation from a straight line passing through the end-points of the ideal ADC transfer
function expressed as the number of LSBs or percentage of the specified full-scale range.
(2) Calculated on the first nine harmonics of the input frequency.
4 Copyright © 2011, Texas Instruments Incorporated
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