FEATURES
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LTC1450/LTC1450L
Parallel Input, 12-Bit
Rail-to-Rail Micropower
DACs in SSOP
DESCRIPTION
The LTC
®
1450/LTC1450L are complete single supply, rail-
to-rail voltage output, 12-bit digital-to-analog converters
(DACs) in a 24-pin SSOP or PDIP package. They include an
output buffer amplifier, reference and a double buffered
parallel digital interface.
The LTC1450 operates from a 4.5V to 5.5V supply. The
output can be pin strapped for 4.095V or 2.048V full-scale.
It has a 2.048V internal reference.
The LTC1450L operates from a 2.7V to 5.5V supply. The
output can be pin strapped for 2.5V or 1.22V full-scale. It
has a 1.22V internal reference.
The LTC1450/LTC1450L offer true stand-alone perfor-
mance. In addition, the reference output, high and low
reference inputs and gain setting resistor are brought to
pins for maximum flexibility.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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Guaranteed Monotonic
Buffered True Rail-to-Rail Voltage Output
12-Bit Resolution
3V Operation (LTC1450L) I
CC
: 250µA Typ
5V Operation (LTC1450) I
CC
: 400µA Typ
Parallel 12-Bit or 8 + 4-Bit Double Buffered
Digital Input
Internal Reference
Output Buffer Configurable to Gain of 1 or 2
Configurable as a Multiplying DAC
Internal Power-On Reset
Maximum DNL Error: 0.5LSB
APPLICATIONS
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Digital Calibration
Industrial Process Control
Automatic Test Equipment
Arbitrary Function Generators
Battery-Powered Data Conversion Products
Feedback Control Loops and Gain Control
TYPICAL APPLICATION
LTC1450: 5V
LTC1450L: 3V TO 5V
REFOUT
UPPER
4-BIT
INPUT
LATCH
REFERENCE
LTC1450: 2.048V
LTC1450L: 1.22V
12-BIT
DAC
LATCH
REFHI
V
CC
D11 (MSB)
D8
D7
DATA IN FROM
MICROPROCESSOR
DATA BUS
12-BIT
DAC
+
–
V
OUT
DNL ERROR (LSB)
LOWER
8-BIT
INPUT
LATCH
D0 (LSB)
CSMSB
FROM
MICROPROCESSOR
DECODE LOGIC
WR
CSLSB
LDAC
FROM
SYSTEM RESET
CLR
LTC1450:
0V TO 4.095V
LTC1450L:
0V TO 2.5V
POWER-ON
RESET
GND
REFLO
X1/X2
LTC1450
LTC1450L
1450/50L TA01
U
U
U
Differential Nonlinearity
vs Input Code
0.5
0.0
–0.5
0
512 1024 1536 2048 2560 3072 3584 4095
CODE
1450/50L TA02
1
LINER [ LINEAR TECHNOLOGY ]
