LTC1454 Datasheet, PDF (1/12 Pages) Linear Technology – Dual 12-Bit Rail-to-Rail Micropower DACs

FEATURES
s _{12-Bit Resolution}
s _{Buffered True Rail-to-Rail Voltage Output}
s _{5V Operation, ICC: 700µA Typ (LTC1454)}
s _{3V Operation, ICC: 450µA Typ (LTC1454L)}
s _{Built-In Reference: 2.048V (LTC1454)}
1.220V (LTC1454L)
s _{CLR Pin}
s _{Power-On Reset}
s _{16-Lead SO Package}
s _{3-Wire Cascadable Serial Interface}
s _{Maximum DNL Error: 0.5LSB}
s _{Low Cost}
U
APPLICATIONS
s _{Digital Calibration}
s _{Industrial Process Control}
s _{Automatic Test Equipment}
s _{Cellular Telephones}
LTC1454/LTC1454L
Dual 12-Bit Rail-to-Rail
Micropower DACs
DESCRIPTION
The LTC^®1454/LTC1454L are complete single supply,
dual rail-to-rail voltage output, 12-bit digital-to-analog
converters (DACs) in a 16-lead SO package. They include
an output buffer amplifier with variable gain (×1 or × 2)
and an easy-to-use 3-wire cascadable serial interface.
The LTC1454 has an onboard reference of 2.048V and a
full-scale output of 4.095V in a × 2 gain configuration. It
operates from a single 4.5V to 5.5V supply.
The LTC1454L has an onboard 1.22V reference and a full-
scale output of 2.5V in a × 2 gain configuration. It operates
from a single 2.7V to 5.5V supply.
Low power supply current, excellent DNL and small size
allow these parts to be used in a host of applications where
size, DNL and single supply operation are important.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Functional BDloaciskyD-Ciahgarianmed: ^{CDounatlr1o2l} -OBuittpRuatsil-to-Rail DAC
LTC1454: 5V
LTC1454L: 3V TO 5V
9, 15
V_CC
LTC1454: 2.048V
10 ^{LTC1454L: 1.22V}
REFOUT
REFHI B 14
4 D_IN
3 CLK
µP
24-BIT
SHIFT
5 CS/LD REG
AND
6 DOUT
DAC
LATCH
12-BIT
DAC B
12-BIT
DAC A
+
V_{OUT B 16}
–
X1/X2 B 1
REFHI A 11
+
V_{OUT A 8}
–
POWER-ON
RESET
CLR
2
REFLO
12
GND
13
X1/X2 A 7
1454 BD02
Differential Nonlinearity
vs Input Code
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0 512 1024 1536 2048 2560 3072 3584 4095
CODE
1454 G08
1