LTC1655/LTC1655L
16-Bit Rail-to-Rail
Micropower DACs in
SO-8 Package
FEATURES
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DESCRIPTIO
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16-Bit Monotonicity Over Temperature
Deglitched Rail-to-Rail Voltage Output
SO-8 Package
I
CC(TYP)
: 600µA
Internal Reference: 2.048V (LTC1655)
1.25V (LTC1655L)
Maximum DNL Error:
±1LSB
Settling Time: 20µS to
±1LSB
750kHz Max Update Rate
Power-On Reset to Zero Volts
3-Wire Cascadable Serial Interface
Low Cost
Pin Compatible Upgrade for LTC1451 12-Bit DAC
Family
The LTC
®
1655/LTC1655L are rail-to-rail voltage output,
16-bit digital-to-analog converters in an SO-8 package.
They include an output buffer and a reference. The 3-wire
serial interface is compatible with SPI/QSPI and
MICROWIRE
TM
protocols. The CLK input has a Schmitt
trigger that allows direct optocoupler interface.
The LTC1655 has an onboard 2.048V reference that can be
overdriven to a higher voltage. The output swings from 0V
to 4.096V when using the internal reference. The typical
power dissipation is 3.0mW on a single 5V supply.
The LTC1655L has an onboard 1.25V reference that can be
overdriven to a higher voltage. The output swings from 0V
to 2.5V when using the internal reference. The typical
power dissipation is 1.8mW on a single 3V supply.
The LTC1655/LTC1655L are pin compatible with Linear
Technology’s 12-bit V
OUT
DAC family, allowing an easy
upgrade path. They are the only buffered 16-bit DACs in
an SO-8 package and they include an onboard reference
for standalone performance.
, LTC and LT are registered trademarks of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
APPLICATIO S
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Digital Calibration
Industrial Process Control
Automatic Test Equipment
Cellular Telephones
FU CTIO AL BLOCK DIAGRA
LTC1655: 4.5V TO 5.5V
LTC1655L: 2.7V TO 5.5V
8
V
CC
2 D
IN
1 CLK
µP
3 CS/LD
16-BIT
SHIFT
REG
AND
DAC
LATCH
16
16-BIT
DAC
REF
LTC1655: 2.048V
LTC1655L: 1.25V
6
REF
Functional Block Diagram: 16-Bit Rail-to-Rail DAC
1.0
0.8
0.6
DNL ERROR (LSB)
0.4
0.2
0
– 0.2
– 0.4
– 0.6
– 0.8
+
–
V
OUT
7
4 D
OUT
POWER-ON
RESET
GND
5
1655/55L TA01
TO
OTHER
DACS
– 1.0
0
16384
32768
CODE
49152
65535
U
Differential Nonlinearity
vs Input Code
1655/55L TA02
W
U
U
U
1
LINER [ LINEAR TECHNOLOGY ]
