LTC1657 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1657 Datasheet PDF : 16 Pages
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LTC1657/LTC1657L
TYPICAL APPLICATIO S
This circuit shows how to measure negative offset. Since
LTC1657/LTC1657L operate on a single supply, if their
offset is negative, the output for code 0 limits at 0V. To
measure this negative offset, a negative supply is needed,
connect resistor R1 as shown in the figure. The output
voltage is the offset when code 0 is loaded in.
Negative Offset Measurement
5V
22
23 24
0.1µF
5:19 DATA (0:15) REFHI REFOUT VCC
2
CSLSB
µP
3
CSMSB
1
WR
LTC1657/LTC1657L
25
VOUT
28
R1
LDAC
27
100k
CLR X1/X2 REFLO GND
26 21 20
–5V
1657 TA06
Although LTC1657 output is up to 4.096V with its internal
reference, higher voltages can be achieved with the help of
another op amp. The following circuit shows how to
increase the output swing of LTC1657 by using an LT1218.
As shown in the configuration, the output of LTC1657 is
amplified by 8 for an output swing of 0V to 32.768V, or a
convenient 0.5mV/LSB.
A Higher Voltage Output DAC
5V
22
23 24
0.1µF 36V
5:19 DATA (0:15) REFHI REFOUT VCC
2
CSLSB
3
µP
CSMSB
1 WR
LTC1657
25
VOUT
3+
7
28
LDAC
LT1218
27
CLR X1/X2 REFLO GND
2–
4
26 21 20
0.1µF
32.768 (V)
6
VOUT
( ) VOUT
=
(DIN)(4.096)
65536
R2
1 + R1
TRANSFER CURVE
R1
R2
1k
6.98k
1%
1%
0
DIN
65535
1657 TA07
RELATED PARTS
PART NUMBER
LTC1446(L)
LTC1450(L)
LTC1458(L)
LTC1650
LTC1654
LTC1655(L)
LTC1658
DESCRIPTION
Dual 12-Bit VOUT DACs in SO-8 Package
Single 12-Bit VOUT DACs with Parallel Interface
Quad 12-Bit Rail-to-Rail Output DACs with Added Functionality
Single 16-Bit VOUT Industrial DAC in 16-Pin SO
Dual 14-Bit VOUT DAC
Single 16-Bit VOUT DAC with Serial Interface in SO-8
Single 14-Bit VOUT DAC in MSOP Package
COMMENTS
VCC = 5V (3V), VOUT = 0V to 4.095V (0V to 2.5V)
VCC = 5V (3V), VOUT = 0V to 4.095V (0V to 2.5V)
VCC = 5V (3V), VOUT = 0V to 4.095V (0V to 2.5V)
VCC = ±5V, Low Power, Deglitched, 4-Quadrant Multiplying VOUT
Programmable Speed/Power, SO-8 Footprint
VCC = 5V (3V), Low Power, Deglitched, VOUT = 0V to 4.096V
(0V to 2.5V)
2.7V to 5.5V Operation, Low Power
16 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900q FAX:(408)434-0507 q www.linear-tech.com
1657lf LT/TP 0201 4K • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1999
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