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Burr-Brown Corporation

ADS1250 Datasheet Preview

ADS1250 Datasheet

20-Bit Data Acquisition System ANALOG-TO-DIGITAL CONVERTER

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®
ADS1250
ADS1250
For most current data sheet and other product
information, visit www.burr-brown.com
20-Bit Data Acquisition System
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q 20 BITS NO MISSING CODES
q 18 BITS EFFECTIVE RESOLUTION UP TO
25kHz DATA RATE
q LOW NOISE: 2.8ppm at PGA = 1
q DIFFERENTIAL INPUTS
q INL: 0.002% (MAX)
q PROGRAMMABLE FULL SCALE
q I/O CONTROLLED PGA: 1, 2, 4, 8
q EXTERNAL REFERENCE
APPLICATIONS
q CARDIAC DIAGNOSTICS
q DIRECT THERMOCOUPLE INTERFACE
q BLOOD ANALYSIS
q INFRARED PYROMETER
q LIQUID/GAS CHROMATOGRAPHY
q PRECISION PROCESS CONTROL
DESCRIPTION
The ADS1250 is a precision, wide dynamic range,
delta-sigma, analog-to-digital converter with 20-bit
resolution operating from a single +5V supply. The
delta-sigma architecture is used for wide dynamic
range and to guarantee 20 bits of no missing code
performance. An effective resolution of 18 bits (2.8ppm
of rms noise) is achieved for conversion rates up to
25kHz. The dynamic range of the converter is further
increased by providing a low-noise Programmable
Gain Amplifier (PGA) with gain stages of 1, 2, 4, or
8 for low level input signals.
The ADS1250 is designed for high-resolution mea-
surement applications in cardiac diagnostics, smart
transmitters, industrial process control, weigh scales,
chromatography and portable instrumentation. The
converter includes a flexible synchronous serial inter-
face and offers a three-wire control mode for low-cost
isolation.
The ADS1250 is a single-channel converter and is
offered in an SOL-16 package.
G0
G1
+VIN
–VIN
PGA
+
4th-Order
∆Σ
Modulator
Digital
Filter
Serial
Output
ADS1250
Control
VREF
CLK
SCLK
DRDY
DOUT
+VS
AGND
DSYNC
CS
+VD
DGND
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1999 Burr-Brown Corporation
PDS-1520B
Printed in U.S.A. December, 1999




Burr-Brown Corporation

ADS1250 Datasheet Preview

ADS1250 Datasheet

20-Bit Data Acquisition System ANALOG-TO-DIGITAL CONVERTER

No Preview Available !

SPECIFICATIONS
All specifications at TMIN to TMAX, VD = VS = +5V, CLK = 9.6MHz, PGA = 1, and VREF = 4.096, unless otherwise specified.
PARAMETER
ANALOG INPUT
Input Voltage Range(1)
Programmable Gain Amplifier
Input Impedance (differential)
Input Capacitance
Input Leakage
DYNAMIC CHARACTERISTICS
Data Rate
Bandwidth
Serial Clock (SCLK)
System Clock Input (CLK)
ACCURACY
Integral Linearity Error(2)
THD
Noise
Resolution
No Missing Codes
Common-Mode Rejection(3)
Gain Error
Offset Error
Gain Sensitivity to VREF
Power Supply Rejection Ratio
PERFORMANCE OVER TEMPERATURE
Offset Drift
Gain Drift
VOLTAGE REFERENCE
VREF
Load Current
DIGITAL INPUT/OUTPUT
Logic Family
Logic Level: VIH
VIL
VOH
VOL
Data Format
POWER SUPPLY REQUIREMENTS
Operation
Quiescent Current, Analog
Quiescent Current, Digital
Operating Power
TEMPERATURE RANGE
Operating
Storage
CONDITIONS
G = Gain
G = Gain
G = Gain
At +25°C
At TMIN to TMAX
3dB
1kHz Input; 0.1dB below FS
at DC
VREF = 4.096V ±0.1V
IOH = –500µA
IOL = 500µA
V = +5VDC
V = +5VDC
ADS1250U
MIN TYP MAX
AGND
1
104/G
6•G
5
±VREF/G
8
50
1
25
5.4
9.6
9.6
±0.0012
±0.0020
97
2.8 3.8
20
20
90 105
1
±100
±200
1:1
60 78
0.25
5.0
3.996V
4.096
125
4.196
+4.0
–0.3
+4.5
CMOS
+VD + 0.3
+0.8
Binary Two’s Complement
0.4
+4.75 +5 +5.25
14
1
75 100
–40 +85
–60 +100
UNITS
V
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
V
V
V
V
VDC
mA
mA
mW
°C
°C
NOTES: (1) In order to achieve the converter’s full-scale range, the input must be fully differential. If the input is single-ended (+VIN or –VIN is fixed), then the
full-scale range is one-half that of the differential range. (2) Applies to full-differential signals. (3) The common-mode rejection test is performed with a 100mV
differential input.
®
ADS1250
2


Part Number ADS1250
Description 20-Bit Data Acquisition System ANALOG-TO-DIGITAL CONVERTER
Maker Burr-Brown Corporation
Total Page 20 Pages
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