Datasheet ADS1286L PDF ( 特性, スペック, ピン接続図 )

		

	 
11
No Preview Available !

® 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





ABSOLUTE MAXIMUM RATINGS(1)
+VCC ..................................................................................................... +6V
Analog Input ....................................................... –0.3V to (+VCC + 300mV)
Logic Input ......................................................... –0.3V to (+VCC + 300mV)
Case Temperature ......................................................................... +100°C
Junction Temperature .................................................................... +150°C
Storage Temperature ..................................................................... +125°C
External Reference Voltage .............................................................. +5.5V
NOTE: (1) Stresses above these ratings may permanently damage the device.
PIN CONFIGURATION
VREF
+In
1
2
–In 3
GND 4
ADS1286
8 +VCC
7 DCLOCK
6 DOUT
5 CS/SHDN
8-Pin Mini PDIP
8-Lead SOIC
ELECTROSTATIC
DISCHARGE SENSITIVITY
Electrostatic discharge can cause damage ranging from per-
formance degradation to complete device failure. Burr-
Brown Corporation recommends that all integrated circuits
be handled and stored using appropriate ESD protection
methods.
ESD damage can range from subtle performance degrada-
tion 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
published specifications.
PIN ASSIGNMENTS
PIN
NAME
DESCRIPTION
1
VREF
Reference Input.
2 +In Non Inverting Input.
3 –In Inverting Input. Connect to ground or remote ground sense point.
4
GND
Ground.
5 CS/SHDN Chip Select when low, Shutdown Mode when high.
6
DOUT
The serial output data word is comprised of 12 bits of data. In operation the data is valid on the falling edge of DCLOCK. The
second clock pulse after the falling edge of CS enables the serial output. After one null bit the data is valid for the next 12 edges.
7 DCLOCK Data Clock synchronizes the serial data transfer and determines conversion speed.
8
+VCC
Power Supply.
PACKAGE/ORDERING INFORMATION
PRODUCT
ADS1286P
ADS1286PK
ADS1286PL
ADS1286U
ADS1286UK
ADS1286UL
ADS1286PA
ADS1286PB
ADS1286PC
ADS1286UA
ADS1286UB
ADS1286UC
INTEGRAL
LINEARITY
±2
±2
±1
±2
±2
±1
±2
±2
±1
±2
±2
±1
TEMPERATURE
RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
PACKAGE
Plastic DIP
Plastic DIP
Plastic DIP
SOIC
SOIC
SOIC
Plastic DIP
Plastic DIP
Plastic DIP
SOIC
SOIC
SOIC
PACKAGE
DRAWING
NUMBER(1)
006
006
006
182
182
182
006
006
006
182
182
182
NOTE: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix
C of Burr-Brown IC Data Book.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN
assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject
to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not
authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.
®
3 ADS1286


3Pages




TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25, VCC = +5V, VREF = +5V, fSAMPLE = 12.5kHz, fCLK = 16 • fSAMPLE, unless otherwise specified.
0
–25
–50
–75
–100
–125
0
4096 POINT FFT
24
Frequency (kHz)
6
PEAK-TO-PEAK NOISE vs REFERENCE VOLTAGE
10
9
8
7
6
5
4
3
2
1
0
0.1
1
Reference Voltage (V)
10
POWER SUPPLY REJECTION vs RIPPLE FREQUENCY
0
–10
VRIPPLE = 20mV
–20
–30
–40
–50
–60
–70
–80
–90
1
10 100 1000
Ripple Frequency (kHz)
10000
3
2.5
2
1.5
1
0.5
0
–55
POWER DOWN SUPPLY CURRENT
vs TEMPERATURE
–40 –25
0
25
Temperature (°C)
70
85
0.15
0.1
0.05
0
–0.05
–0.1
–0.15
–55
CHANGE GAIN vs TEMPERATURE
–40 –25
0
25
Temperature (°C)
70
85
400
350
300
250
200
150
100
–55
SUPPLY CURRENT vs TEMPERATURE
fSAMPLE = 12.5kHz
fSAMPLE = 1.6kHz
–40 –25
0
25
Temperature (°C)
70
85
®
ADS1286
6

6 Page