Datasheet

ADS1251
2
SBAS184D
www.ti.com
Analog Input: Current ............................................... ±100mA, Momentary
±10mA, Continuous
Voltage .................................... GND – 0.3V to V
DD
+ 0.3V
V
DD
to GND ............................................................................ –0.3V to 6V
V
REF
Voltage to GND ............................................... –0.3V to V
DD
+ 0.3V
Digital Input Voltage to GND ................................... –0.3V to V
DD
+ 0.3V
Digital Output Voltage to GND ................................. –0.3V to V
DD
+ 0.3V
Operating Temperature ...................................................... –40°C to 85°C
Power Dissipation .......................................................................... 500mW
ABSOLUTE MAXIMUM RATINGS
(1)
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas
Instruments recommends that all integrated circuits be handled
with appropriate precautions. Failure to observe proper han-
dling and installation procedures can cause damage.
ESD damage can range from subtle performance degrada-
tion to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet its
published specifications.
NOTE: (1) Stresses above those listed under “Absolute Maximum Ratings”
may cause permanent damage to the device. Exposure to absolute maximum
conditions for extended periods may affect device reliability.
SPECIFIED
PACKAGE TEMPERATURE PACKAGE ORDERING TRANSPORT
PRODUCT PACKAGE-LEAD DESIGNATOR RANGE MARKING NUMBER MEDIA, QUANTITY
ADS1251 SO-8 D –40°C to +85°C ADS1251U ADS1251U Rails, 100
" """"ADS1251U/2K5 Tape and Reel, 2500
NOTE: (1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com.
PACKAGE/ORDERING INFORMATION
(1)
ELECTRICAL CHARACTERISTICS
All specifications at T
MIN
to T
MAX
, V
DD
= +5V, CLK = 8MHz, and V
REF
= 4.096, unless otherwise specified.
ADS1251U
PARAMETER CONDITIONS MIN TYP MAX UNITS
ANALOG INPUT
Full-Scale Input Voltage +V
IN
– (–V
IN
) ±V
REF
V
Absolute Input Voltage +V
IN
or –V
IN
to GND –0.3 V
DD
V
Differential Input Impedance CLK = 3.84kHz 430 MΩ
CLK = 1MHz 1.7 MΩ
CLK = 8MHz 210 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, CLK = 8MHz 4.24 kHz
Serial Clock (SCLK) 8MHz
System Clock Input (CLK) 8MHz
ACCURACY
Integral Nonlinearity Differential Input ±0.0002 ±0.0015 % of FSR
THD 1kHz Input; 0.1dB below FS 105 dB
Noise 1.5 2.5 ppm of FSR, rms
Resolution 24 Bits
No Missing Codes 24 Bits
Common-Mode Rejection 60Hz, AC 90 98 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 80 dB
PERFORMANCE OVER TEMPERATURE
Offset Drift 0.07 ppm/°C
Gain Drift 0.4 ppm/°C
PRODUCT # OF INPUTS MAXIMUM DATA RATE COMMENTS
ADS1250 1 Differential 25.0kHz Includes PGA from 1 to 8
ADS1251 1 Differential 20.8kHz
ADS1252 1 Differential 41.7kHz
ADS1253 4 Differential 20.8kHz
ADS1254 4 Differential 20.8kHz Includes Separate Analog and Digital Supplies
PRODUCT FAMILY