Datasheet
ADS8528
ADS8548
ADS8568
SBAS543A –AUGUST 2011– REVISED OCTOBER 2011
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ELECTRICAL CHARACTERISTICS: GENERAL
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.
ADS8528, ADS8548, ADS8568
PARAMETER CONDITIONS MIN TYP MAX UNIT
ANALOG INPUT
RANGE pin/RANGE bit = 0 –4VREF 4VREF V
Bipolar full-scale range CHXX
RANGE pin/RANGE bit = 1 –2VREF 2VREF V
Input range = ±4VREF 10 pF
Input capacitance
Input range = ±2VREF 20 pF
Input leakage current No ongoing conversion –1 1 μA
Aperture delay 5 ns
Aperture delay matching Common CONVST for all channels 100 ps
Aperture jitter 50 ps
Power-supply rejection ratio PSRR At output code FFFFh, related to HVDD and HVSS –78 dB
REFERENCE VOLTAGE OUTPUT (REF
OUT
)
2.5V operation, REFDAC = 3FFh 2.485 2.5 2.515 V
2.5V operation, REFDAC = 3FFh at +25°C 2.496 2.5 2.504 V
Reference voltage VREF
3.0V operation, REFDAC = 3FFh 2.985 3.0 3.015 V
3.0V operation, REFDAC = 3FFh at +25°C 2.995 3.0 3.005 V
Reference voltage drift dVREF/dT ±10 ppm/°C
Power-supply rejection ratio PSRR At output code FFFFh, related to AVDD –77 dB
Output current IREF
OUT
DC current –2 2 mA
Short-circuit current
(1)
I
REFSC
50 mA
Turn-on settling time t
REFON
10 ms
At REF_xP/N pins 4.7 10 μF
External load capacitance
At REFIO pin 100 470 nF
Tuning range REFDAC Internal reference output voltage range 0.2 VREF VREF V
REFDAC resolution 10 Bits
REFDAC differential nonlinearity DNL
DAC
–1 ±0.1 1 LSB
REFDAC integral nonlinearity INL
DAC
–2 ±0.1 2 LSB
REFDAC offset error V
OSDAC
VREF = 0.5V (DAC = 0CDh) –4 ±0.65 4 LSB
REFERENCE VOLTAGE INPUT (REF
IN
)
Reference input voltage VREF
IN
0.5 2.5 3.025 V
Input resistance 100 MΩ
Input capacitance 5 pF
Reference input current 1 μA
(1) Reference output current is not limited internally.
6 Copyright © 2011, Texas Instruments Incorporated
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