LTC1657 LINER [Linear Technology], LTC1657 Datasheet - Page 12

• Manufacturer Part Number: LTC1657
• Description: Parallel 16-Bit Rail-to-Rail Micropower DAC
• Manufacturer: LINER [Linear Technology]

RELATED PARTS
LTC1657
This circuit shows how to measure negative offset. Since
LTC1657 operates on a single supply, if its offset is
negative, the output for code 0 limits at 0V. To measure
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.
PART NUMBER
LTC1446(L)
LTC1450(L)
LTC1458(L)
LTC1650
LTC1655(L)
12
TYPICAL APPLICATIO
P
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] FAX: [phone] www.linear-tech.com
5:19
28
27
2
3
1
DATA (0:15)
CSLSB
CSMSB
WR
LDAC
CLR
DESCRIPTION
Dual 12-Bit V
Single 12-Bit V
Quad 12-Bit Rail-to-Rail Output DACs with Added Functionality
Single 16-Bit V
Single 16-Bit V
X1/X2
26
REFHI
OUT
REFLO
OUT
OUT
OUT
LTC1657
22
21
DACs in SO-8 Package
DACs with Parallel Interface
Industrial DAC in 16-Pin SO
DAC with Serial Interface in SO-8
REFOUT
GND
U
20
23
P
V
5V
CC
24
5:19
28
27
V
2
3
1
OUT
Negative Offset Measurement
DATA (0:15)
CSLSB
CSMSB
WR
LDAC
CLR
A Higher Voltage Output DAC
25
X1/X2
0.1 F
3
2
R1
1k
1%
26
–
+
LT1218
REFHI
REFLO
36V
LTC1657
7
4
22
21
this negative offset, a negative supply is needed, connect
resistor R1 as shown in the figure. The output voltage is
the negative offset when code 0 is loaded in.
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.
REFOUT
6.98k
GND
1%
R2
0.1 F
20
23
6
V
COMMENTS
V
V
V
V
V
(0V to 2.5V)
5V
CC
V
CC
CC
CC
CC
CC
24
OUT
= 5V (3V), V
= 5V (3V), V
= 5V (3V), V
= 5V, Low Power, Deglitched, 4-Quadrant Multiplying V
= 5V (3V), Low Power, Deglitched, V
V
=
OUT
(D
IN
65536
)(4.096)
25
–5V
1657 TA06
R1
100k
OUT
OUT
OUT
0.1 F
1 +
= 0V to 4.095V (0V to 2.5V)
= 0V to 4.095V (0V to 2.5V)
= 0V to 4.095V (0V to 2.5V)
32.768 (V)
R2
R1
TRANSFER CURVE
V
LINEAR TECHNOLOGY CORPORATION 1999
OUT
0
1657f LT/TP 0400 4K • PRINTED IN USA
OUT
= 0V to 4.096V
65535
1657 TA07
D
IN
OUT