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Burr-Brown Corporation

ADS1254 Datasheet Preview

ADS1254 Datasheet

24-Bit/ 20kHz/ Low Power ANALOG-TO-DIGITAL CONVERTER

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ADS1254
ADS1254
SBAS213 – JUNE 2001
24-Bit, 20kHz, Low Power
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q 24 BITS—NO MISSING CODES
q 19 BITS EFFECTIVE RESOLUTION UP TO
20kHz DATA RATE
q LOW NOISE: 1.8ppm
q FOUR DIFFERENTIAL INPUTS
q INL: 15ppm (max)
q EXTERNAL REFERENCE (0.5V to 5V)
q POWER-DOWN MODE
q SYNC MODE
q LOW POWER: 4mW at 20kHz
q SEPARATE DIGITAL INTERFACE SUPPLY 1.8V
to 3.6V
APPLICATIONS
q CARDIAC DIAGNOSTICS
q DIRECT THERMOCOUPLE INTERFACES
q BLOOD ANALYSIS
q INFRARED PYROMETERS
q LIQUID/GAS CHROMATOGRAPHY
q PRECISION PROCESS CONTROL
DESCRIPTION
The ADS1254 is a precision, wide dynamic range, delta-
sigma, Analog-to-Digital (A/D) converter with 24-bit reso-
lution. The delta-sigma architecture is used for wide dy-
namic range and to ensure 24 bits of no missing codes
performance. An effective resolution of 19 bits (1.8ppm of
rms noise) is achieved for conversion rates up to 20kHz.
The ADS1254 is designed for high-resolution measurement
applications in cardiac diagnostics, smart transmitters, in-
dustrial process control, weight scales, chromatography, and
portable instrumentation. The converter includes a flexible,
two-wire synchronous serial interface for low-cost isolation.
The ADS1254 is a multi-channel converter and is offered in
an SSOP-20 package.
CH1+
CH1
CH2+
CH2
CH3+
CH3
CH4+
CH4
ADS1254
Mux
4th-Order
∆Σ
Modulator
Digital
Filter
Serial
Interface
Control
VREF
CLK
SCLK
DOUT/DRDY
AVDD
AGND
DVDD
DGND
CHSEL0 CHSEL1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright © 2001, Texas Instruments Incorporated




Burr-Brown Corporation

ADS1254 Datasheet Preview

ADS1254 Datasheet

24-Bit/ 20kHz/ Low Power ANALOG-TO-DIGITAL CONVERTER

No Preview Available !

ABSOLUTE MAXIMUM RATINGS
Analog Input: Current (Momentary) .............................................. ±100mA
(Continuous) ............................................... ±10mA
Voltage ................................... GND 0.3V to VDD + 0.3V
AVDD to AGND ....................................................................... 0.3V to 6V
DVDD to AVDD .......................................................................... 6V to +6V
DVDD to DGND ....................................................................... 0.3V to 6V
VREF Voltage to AGND ............................................. 0.3V to VDD + 0.3V
Digital Input Voltage to DGND ................................. 0.3V to VDD + 0.3V
Digital Output Voltage to DGND .............................. 0.3V to VDD + 0.3V
Lead Temperature (soldering, 10s) .............................................. +300°C
Power Dissipation (any package) ................................................. 500mW
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.
PACKAGE/ORDERING INFORMATION
PRODUCT
ADS1254E
"
PACKAGE
SSOP-20
"
PACKAGE
DRAWING
NUMBER
349
"
SPECIFIED
TEMPERATURE
RANGE
40°C to +85°C
"
PACKAGE
MARKING
ADS1254E
"
ORDERING
NUMBER(1)
ADS1254E
ADS1254E/2K5
TRANSPORT
MEDIA
Rails
Tape and Reel
NOTE: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500 pieces
of ADS1254E/2K5will get a single 2500-piece Tape and Reel.
ELECTRICAL CHARACTERISTICS
All specifications at TMIN to TMAX, AVDD = +5V, DVDD = +1.8V. CLK = 8MHz, and VREF = 4.096, unless otherwise specified.
PARAMETER
ANALOG INPUT
Input Voltage Range
Input Impedance
Input Capacitance
Input Leakage
DYNAMIC CHARACTERISTICS
Data Rate
Bandwidth
Serial Clock (SCLK)
System Clock Input (CLK)
ACCURACY
Integral Non-Linearity(1)
THD
Noise
Resolution
No Missing Codes
Common-Mode Rejection
Gain Error
Offset Error
Gain Sensitivity to VREF
Power-Supply Rejection Ratio
PERFORMANCE OVER TEMPERATURE
Offset Drift
Gain Drift
VOLTAGE REFERENCE
VREF
Load Current
CONDITIONS
CLK = 3,840Hz
CLK = 1MHz
CLK = 8MHz
At +25°C
At TMIN to TMAX
3dB
MIN
AGND
4.24
1kHz Input; 0.1dB below FS
60Hz, AC
90
70
0.5
ADS1254E
TYP
260
1
125
6
5
±0.0002
105
1.8
24
24
102
0.1
±30
1:1
88
0.07
0.4
4.096
32
MAX
±VREF
50
1
20.8
8
8
±0.0015
2.7
1
±100
VDD
NOTE: (1) Applies to full-differential signals.
UNITS
V
M
M
k
pF
pA
nA
kHz
kHz
MHz
MHz
% of FSR
dB
ppm of FSR, rms
Bits
Bits
dB
% of FSR
ppm of FSR
dB
ppm/°C
ppm/°C
V
µA
2 ADS1254
SBAS213


Part Number ADS1254
Description 24-Bit/ 20kHz/ Low Power ANALOG-TO-DIGITAL CONVERTER
Maker Burr-Brown Corporation
Total Page 17 Pages
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