Datasheet

ADS1254
2
SBAS213B
www.ti.com
Analog Input: Current (Momentary).............................................. ±100mA
(Continuous) ............................................... ±10mA
Voltage ................................... GND – 0.3V to V
DD
+ 0.3V
AV
DD
to AGND ....................................................................... –0.3V to 6V
DV
DD
to AV
DD
.......................................................................... –6V to +6V
DV
DD
to DGND ....................................................................... –0.3V to 6V
V
REF
Voltage to AGND ............................................. –0.3V to V
DD
+ 0.3V
Digital Input Voltage to DGND ................................. –0.3V to V
DD
+ 0.3V
Digital Output Voltage to DGND .............................. –0.3V to V
DD
+ 0.3V
Lead Temperature (soldering, 10s) .............................................. +300°C
Power Dissipation (any package) ................................................. 500mW
NOTE: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability.
ABSOLUTE MAXIMUM RATINGS
(1)
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instru-
ments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
ESD damage can range from subtle performance degradation
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.
CH1+
ADS1254E
CH4–
CH1–
CH4+
CH2+
V
REF
AGND
CH2–
1
2
3
4
20
19
18
17
16
15
14
13
12
11
CH3+
CHSEL1
CH3–
CHSEL0
AV
DD
SCLK
DOUT/DRDY
CLK
5
6
7
8
9
10
DV
DD
DGND
NC
NC
PIN CONFIGURATION
Top View SSOP-20
PIN DESCRIPTIONS
PIN NAME PIN DESCRIPTION
1 CH1+ Analog Input: Positive Input of the Differential
Analog Input
2 CH1– Analog Input: Negative Input of the Differential
Analog Input
3 CH2+ Analog Input: Positive Input of the Differential
Analog Input
4 CH2– Analog Input: Negative Input of the Differential
Analog Input
5 CH3+ Analog Input: Positive Input of the Differential
Analog Input
6 CH3– Analog Input: Negative Input of the Differential
Analog Input
7AV
DD
Input: Analog Power Supply Voltage, +5V
8 CLK Digital Input: Device System Clock. The system
clock is in the form of a CMOS-compatible
clock. This is a Schmitt-Trigger input
9DV
DD
Input: Digital Power Supply Voltage
10 NC No Connection
11 NC No Connection
12 DGND Input: Digital Ground
13 DOUT/DRDY Digital Output: Serial Data Output/Data Ready.
This output indicates that a new output word is
available from the ADS1254 data output regis-
ter. The serial data is clocked out of the serial
data output shift register using SCLK.
14 SCLK Digital Input: Serial Clock. The serial clock is in
the form of a CMOS-compatible clock. The
serial clock operates independently from the
system clock; therefore, it is possible to run
SCLK at a higher frequency than CLK. The
normal state of SCLK is LOW. Holding SCLK
HIGH will either initiate a modulator reset for
synchronizing multiple converters or enter power-
down mode. This is a Schmitt-Trigger input.
15 CHSEL1 Digital Input: Used to select analog input chan-
nel. This is a Schmitt-Trigger Input
16 CHSEL0 Digital Input: Used to select analog input chan-
nel. This is a Schmitt-Trigger Input
17 AGND Input: Analog Ground
18 V
REF
Analog Input: Reference Voltage Input
19 CH4– Analog Input: Negative Input of the Differential
Analog Input
20 CH4+ Analog Input: Positive Input of the Differential
Analog Input
For the most current package and ordering information, see
the Package Option Addendum at the end of this document,
or see the TI website at www.ti.com.
PACKAGE/ORDERING INFORMATION