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PDF ADS1250 Data sheet ( Hoja de datos )
| Número de pieza | ADS1250 | |
| Descripción | 20-Bit Data Acquisition System ANALOG-TO-DIGITAL CONVERTER | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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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
1 page  
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VD = VS = +5V, CLK = 9.6MHz, PGA = 1, and VREF = 4.096, unless otherwise specified.
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
1
RMS NOISE vs DATA OUTPUT RATE
PGA = 4
PGA = 8
PGA = 1
PGA = 2
10
100
1000
10000 10000
Data Output Rate (Hz)
20.0
19.0
18.0
17.0
16.0
1
EFFECTIVE RESOLUTION
vs DATA OUTPUT RATE
PGA = 1 PGA = 2
PGA = 4
PGA = 8
10
100
1000
10000
10000
Data Output Rate (Hz)
RMS NOISE vs TEMPERATURE
4.0
PGA = 8
3.5
PGA = 4
3.0
2.5
PGA = 1
2.0 PGA = 2
1.5
1.0
0.5
0.0
–60 –40 –20
0
20 40 60 80
Temperature (°C)
100
INTEGRAL NON-LINEARITY vs TEMPERATURE
20
PGA = 1
15
PGA = 2
10
PGA = 8
5
PGA = 4
0
–60 –40 –20
0
20 40 60
Temperature (°C)
80 100
RMS NOISE vs INPUT VOLTAGE (PGA = 1)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
–4.0
–3.0 –2.0 –1.0 0.0 1.0 2.0
Differential Analog Input Voltage (V)
3.0
4.0
14.0
13.5
13.0
12.5
12.0
11.5
11.0
10.5
10.0
1
INTEGRAL NON-LINEARITY
vs DATA OUTPUT RATE (PGA = 1)
10
100
1000
10000 10000
Data Output Rate (Hz)
®
5 ADS1250
5 Page 
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
–200
0
DIGITAL FILTER RESPONSE
50 100 150 200 250 300
Frequency (Hz)
FIGURE 5. Digital Filter Response (60Hz).
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
–200
0
DIGITAL FILTER RESPONSE
10 20 30 40 50 60 70 80 90 100
Frequency (Hz)
FIGURE 6. Digital Filter Response (10Hz Multiples).
DIGITAL FILTER RESPONSE
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
–200
45 46 47 48 49 50 51 52 53 54 55
Frequency (Hz)
FIGURE 7. Expanded Digital Filter Response (50Hz with a
50Hz Notch).
DIGITAL FILTER RESPONSE
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
–200
45 46 47 48 49 50 51 52 53 54 55
Frequency (Hz)
FIGURE 8. Expanded Digital Filter Response (50Hz with a
10Hz Notch).
DIGITAL FILTER RESPONSE
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
–200
55 56 57 58 59 60 61 62 63 64 65
Frequency (Hz)
DIGITAL FILTER RESPONSE
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
–200
55 56 57 58 59 60 61 62 63 64 65
Frequency (Hz)
FIGURE 9. Expanded Digital Filter Response (60Hz with a FIGURE 10. Expanded Digital Filter Response (60Hz with
60Hz Notch).
a 10Hz Notch).
®
11 ADS1250
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ADS1250.PDF ] | |
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