LTC1450 Datasheet, PDF (1/16 Pages) Linear Technology – Parallel Input, 12-Bit Rail-to-Rail Micropower DACs in SSOP

FEATURES
s _{Guaranteed Monotonic}
s _{Buffered True Rail-to-Rail Voltage Output}
s _{12-Bit Resolution}
s _{3V Operation (LTC1450L) ICC: 250µA Typ}
s _{5V Operation (LTC1450) ICC: 400µA Typ}
s _{Parallel 12-Bit or 8 + 4-Bit Double Buffered}
Digital Input
s _{Internal Reference}
s _{Output Buffer Configurable to Gain of 1 or 2}
s _{Configurable as a Multiplying DAC}
s _{Internal Power-On Reset}
s _{Maximum DNL Error: 0.5LSB}
U
APPLICATIONS
s _{Digital Calibration}
s _{Industrial Process Control}
s _{Automatic Test Equipment}
s _{Arbitrary Function Generators}
s _{Battery-Powered Data Conversion Products}
s _{Feedback Control Loops and Gain Control}
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.
TYPICAL APPLICATION
LTC1450: 5V
LTC1450L: 3V TO 5V
D11 (MSB)
D8
D7
DATA IN FROM
MICROPROCESSOR
DATA BUS
UPPER
4-BIT
INPUT
LATCH
LOWER
8-BIT
INPUT
LATCH
12-BIT
DAC
LATCH
REFOUT
REFERENCE
LTC1450: 2.048V
LTC1450L: 1.22V
12-BIT
DAC
REFHI
V_CC
+
–
V_OUT
LTC1450:
0V TO 4.095V
LTC1450L:
0V TO 2.5V
FROM
MICROPROCESSOR
DECODE LOGIC
FROM
SYSTEM RESET
D0 (LSB)
CSMSB
WR
CSLSB
LDAC
CLR
POWER-ON
RESET
GND
REFLO X1/X2
LTC1450
LTC1450L
1450/50L TA01
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