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PDF ADS1286B Data sheet ( Hoja de datos )
| Número de pieza | ADS1286B | |
| Descripción | 12-Bit Micro Power Sampling ANALOG-TO-DIGITAL CONVERTER | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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® ADS1286
ADS1286
ADS1286
12-Bit Micro Power Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q SERIAL INTERFACE
q GUARANTEED NO MISSING CODES
q 20kHz SAMPLING RATE
q LOW SUPPLY CURRENT: 250µA
APPLICATIONS
q REMOTE DATA ACQUISITION
q ISOLATED DATA ACQUISITION
q TRANSDUCER INTERFACE
q BATTERY OPERATED SYSTEMS
DESCRIPTION
The ADS1286 is a 12-bit, 20kHz analog-to-digital
converter with a differential input and sample and hold
amplifier and consumes only 250µA of supply cur-
rent. The ADS1286 offers an SPI and SSI compatible
serial interface for communications over a two or three
wire interface. The combination of a serial two wire
interface and micropower consumption makes the
ADS1286 ideal for remote applications and for those
requiring isolation.
The ADS1286 is available in a 8-pin plastic mini DIP
and a 8-lead SOIC.
VREF
+In
–In
S/H Amp
SAR
CDAC
Comparator
Control
Serial
Interface
DOUT
DCLOCK
CS/SHDN
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
©1996 Burr-Brown Corporation
PDS-1335B
Printed in U.S.A. October, 1998
1 page  
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25, VCC = +5V, VREF = +5V, fSAMPLE = 12.5kHz, fCLK = 16 • fSAMPLE, unless otherwise specified.
12
11.75
11.5
11.25
11
10.75
10.5
10.25
10
0.1
EFFECTIVE NUMBER OF BITS
vs REFERENCE VOLTAGE
1
Reference Voltage (V)
10
3.0
2.0
1.0
0
–1.0
–2.0
–3.0
0
DIFFERENTIAL LINEARITY ERROR vs CODE
2048
Code
4095
100
90
80
70
60
50
40
30
20
10
0
0.1
SIGNAL-TO-(NOISE + DISTORTION)
vs FREQUENCY
1
Frequency (kHz)
10
100
90
80
70
60
50
40
30
20
10
0
0.1
SPURIOUS FREE DYNAMIC RANGE
AND SIGNAL-TO-NOISE RATIO vs FREQUENCY
Spurious Free Dynamic Range
Signal-to-Noise Ratio
1
Frequency (kHz)
10
SIGNAL-TO-(NOISE + DISTORTION) vs INPUT LEVEL
80
70
60
50
40
30
20
10
0
–40 –35 –30 –25 –20 –15 –10
Input Level (dB)
–5
0
TOTAL HARMONIC DISTORTION vs FREQUENCY
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
0.1
1
Frequency (kHz)
10
®
5 ADS1286
5 Page 
+5V +5V
D1
TC1
Thermocouple
TC2
TC3
ISO Thermal Block
R1
150kΩ
R2
59kΩ
R6
1MΩ
R4
1kΩ
C4
10µF
R3
500kΩ
C3
0.1µF
R7
10Ω
C2
0.1µF
VREF
DCLOCK
ADS1286 DOUT
CS/SHDN
R5
500Ω
C5
0.1µF
U1
3-Wire
Interface
OPA237
U2
µP
U4
C1
10µF
MUX
A0
A1
U3
+5V
R8
46kΩ
R9
1kΩ
R10
1kΩ
R11
1kΩ
R12
1kΩ
0.4V
0.3V
0.2V
0.1V
FIGURE 5. Thermocouple Application Using a MUX to Scale the Input Range of the ADS1286.
REF200
(100µA)
RTD
+VCC
0.1µF
VREF
18
2
ADS1286
3
4
DCLOCK
DOUT
CS/SHDN
µP
FIGURE 6. ADS1286 with RTD Sensor.
®
11 ADS1286
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet ADS1286B.PDF ] | |
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