Datasheet

ADS1254
3
SBAS213B
www.ti.com
ADS1254E
PARAMETER CONDITIONS MIN TYP MAX UNITS
ELECTRICAL CHARACTERISTICS
All specifications at T
MIN
to T
MAX
, AV
DD
= +5V, DV
DD
= +1.8V. CLK = 8MHz, and V
REF
= 4.096, unless otherwise specified.
NOTE: (1) Applies to full-differential signals.
ANALOG INPUT
Input Voltage Range AGND ±V
REF
V
Input Impedance CLK = 3,840Hz 260 MΩ
CLK = 1MHz 1 MΩ
CLK = 8MHz 125 kΩ
Input Capacitance 6pF
Input Leakage At +25°C550pA
At T
MIN
to T
MAX
1nA
DYNAMIC CHARACTERISTICS
Data Rate 20.8 kHz
Bandwidth –3dB 4.24 kHz
Serial Clock (SCLK) 8 MHz
System Clock Input (CLK) 8 MHz
ACCURACY
Integral Non-Linearity
(1)
±0.0002 ±0.0015 % of FSR
THD 1kHz Input; 0.1dB below FS 105 dB
Noise 1.8 2.7 ppm of FSR, rms
Resolution 24 Bits
No Missing Codes 24 Bits
Common-Mode Rejection 60Hz, AC 90 102 dB
Gain Error 0.1 1 % of FSR
Offset Error ±30 ±100 ppm of FSR
Gain Sensitivity to V
REF
1:1
Power-Supply Rejection Ratio 70 88 dB
PERFORMANCE OVER TEMPERATURE
Offset Drift 0.07 ppm/°C
Gain Drift 0.4 ppm/°C
VOLTAGE REFERENCE
V
REF
0.5 4.096 V
DD
V
Load Current 32 µA
DIGITAL INPUT/OUTPUT
Logic Family CMOS
Logic Level: V
IH
0.65 • DV
DD
DV
DD
+ 0.3 V
V
IL
–0.3 0.35 • DV
DD
V
V
OH
I
OH
= –500µADV
DD
–0.4 V
V
OL
I
OL
= 500µA 0.4 V
Input (SCLK, CLK, CHSEL0, CHSEL1) Hysteresis 0.6 V
Data Format Offset Binary Two’s Complement
POWER-SUPPLY REQUIREMENTS
Power Supply Voltage DV
DD
1.8 3.6 VDC
AV
DD
4.75 5 5.25 VDC
Quiescent Current AV
DD
= +5V 0.8 1.15 mA
DV
DD
= +1.8V 0.2 0.4 mA
Operating Power 4.3 6.5 mW
Power-Down Current 0.4 1 µA
TEMPERATURE RANGE
Operating –40 +85 °C
Storage –60 +150 °C