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PDF ISO809P Data sheet ( Hoja de datos )

Número de pieza ISO809P
Descripción Isolated 16-Bit Sampling ANALOG-TO-DIGITAL CONVERTER
Fabricantes Burr-Brown Corporation 
Logotipo Burr-Brown Corporation Logotipo



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®
ISO809
ISO809
Isolated 16-Bit Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q 100kHz SAMPLING RATE
q 1500Vrms ISOLATION CONTINUOUS
q 10µS CONVERSION TIME
q 16-BIT SERIAL OUTPUT
q SINGLE +5V SUPPLY
q 28-PIN 0.6" PLASTIC DIP
APPLICATIONS
q INDUSTRIAL PROCESS CONTROL
q PC-BASED DATA ACQUISITION TEST
EQUIPMENT
DESCRIPTION
The ISO809 is a low-power isolated sampling ADC
using state-of-the-art CMOS structures and high volt-
age capacitors. The ISO809 contains a complete 16-bit
capacitor based SAR, ADC with S/H, clock, refer-
ence, µP interface, serial out and galvanic isolation.
Laser-trimmed scaling resistors provide standard
industrial input ranges including ±10V, ±5V, 0-5V,
0-4V. They are available in 28-pin 0.6" wide plastic
DIP and are specified over the industrial temperature
range of –40°C to +85°C.
Isolation
Barrier
R1IN
R2IN
R3IN
CAP
20k
10k
5k20k
REF
Successive Approximation Register and Control Logic
Clock
Internal
+2.5V Ref
4k
Serial
Data
Out
SB/BTC
R/C
BUSY
Data Clock
Serial Data
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/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1996 Burr-Brown Corporation
PDS-1321B
Printed in U.S.A. August, 1997

1 page




ISO809P pdf
t1
R/C
BUSY
t2
MODE Acquire
t5
FIGURE 1. Basic Conversion Timing.
t3
Convert
t6
R/C
DATACLK
SDATA
BUSY
t2
t8
t9
123
t11
t10
MSB Valid Bit 14 Valid Bit 13 Valid
t3
FIGURE 2. Serial Data Timing.
t4
Acquire
t7
15 16
Bit 1 Valid
LSB Valid
SPECIFIC FUNCTION
Initiate Conversion and Output Data
R/C
0
1>0
Incorrect Conversions
0
Selecting Output Format
TABLE III. Control Truth Table.
X
X
BUSY
1
1
0>1
X
DATACLK
Output
Output
X
X
SB/BTC OPERATION
X Initiates Conversion “n”. Data from conversion “n–1” clocked out
on DATA synchronized to 12 clock pulses output on DATACLK.
X Initiates Conversion “n”. Data from conversion “n–1” clocked out
on DATA synchronized to 12 clock pulses output on DATACLK.
X R/C must be HIGH or a new conversion will be initiated without
time for acquisition.
0 Serial Data is output in Binary Two’s Complement format.
XX
1 Serial Data is output in Straight Binary format.
DIGITAL OUTPUT
BINARY TWO’S COMPLEMENT
(SB/BTC LOW)
STRAIGHT BINARY
(SB/BTC HIGH)
DESCRIPTION
ANALOG INPUT
BINARY CODE
HEX
CODE
HEX
BINARY CODE CODE
Full-Scale Range
±10 ±5 ±3.33V 0V to 10V 0V to 5V 0V to 4V
Least Significant Bit (LSB) 305µV
153µV
102µV
153µV
76µV
61µV
+Full Scale (FS – 1LSB) 9.999695V 4.999847V 3.333231V 9.999847V 4.999924V 3.999939V 0111 1111 1111 1111
7FFF 1111 1111 1111 1111 FFFF
Midscale
One LSB Below Midscale
0V
–305µV
0V
–153µV
0V
–102µV
5V 2.5V 2V 0000 0000 0000 0000
4.999847V 2.499924V 1.999939V 1111 1111 1111 1111
0000 1000 0000 0000 0000 8000
FFFF 0111 1111 1111 1111 7FFF
–Full Scale
–10V
–5V –3.333333V 0V
0V
0V 1000 0000 0000 0000 8000 0000 0000 0000 0000 0000
TABLE IV. Output Codes and Ideal Input Voltages.
®
5 ISO809

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