Datasheet
ADS8528
ADS8548
ADS8568
www.ti.com
SBAS543A –AUGUST 2011– REVISED OCTOBER 2011
ELECTRICAL CHARACTERISTICS: ADS8568
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.
ADS8568
PARAMETER CONDITIONS MIN TYP MAX UNIT
SAMPLING DYNAMICS
Conversion time Internal conversion clock 1.7 μs
Serial interface, all four SDOx active 400 kSPS
Throughput rate f
DATA
Parallel interface 510 kSPS
DC ACCURACY
Resolution 16 Bits
No missing codes 16 Bits
At T
A
= –40°C to +85°C, QFN package (RGC) –3 ±1.5 3 LSB
At T
A
= –40°C to +125°C, QFN package (RGC) –4 ±1.5 4 LSB
Integral linearity error
(1)
INL
At T
A
= –40°C to +85°C, LQFP package (PM) –4 ±1.5 4 LSB
At T
A
= –40°C to +125°C, LQFP package (PM) –4.5 ±1.5 4.5 LSB
At T
A
= –40°C to +85°C –1 ±0.75 1.75 LSB
Differential linearity error DNL
At T
A
= –40°C to +125°C –1 ±0.75 2 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
At f
IN
= 10kHz, T
A
= –40°C to +85°C 90 91.5 dB
Signal-to-noise ratio SNR
At f
IN
= 10kHz, T
A
= –40°C to +125°C 89 91.5 dB
At f
IN
= 10kHz, T
A
= –40°C to +85°C 87 90 dB
Signal-to-noise ratio + distortion SINAD
At f
IN
= 10kHz, T
A
= –40°C to +125°C 86.5 90 dB
At f
IN
= 10kHz, T
A
= –40°C to +85°C –94 –90 dB
Total harmonic distortion
(2)
THD
At f
IN
= 10kHz, T
A
= –40°C to +125°C –94 –89.5 dB
At f
IN
= 10kHz, T
A
= –40°C to +85°C 90 95 dB
Spurious-free dynamic range SFDR
At f
IN
= 10kHz, T
A
= –40°C to +125°C 89.5 95 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.
Copyright © 2011, Texas Instruments Incorporated 5
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