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LTC1454LC Datasheet

  • LTC1454LC

  • Linear Technology [Dual 12-Bit Rail-to-Rail Micropower DACs...

  • 249.41KB

  • LINER

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LTC1454/LTC1454L
Dual 12-Bit Rail-to-Rail
Micropower DACs
FEATURES
s
s
s
s
s
DESCRIPTION
The LTC
廬
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 (脳1 or
脳
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
脳
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
脳
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.
s
s
s
s
s
s
12-Bit Resolution
Buffered True Rail-to-Rail Voltage Output
5V Operation, I
CC
: 700碌A Typ (LTC1454)
3V Operation, I
CC
: 450碌A Typ (LTC1454L)
Built-In Reference: 2.048V (LTC1454)
1.220V (LTC1454L)
CLR Pin
Power-On Reset
16-Lead SO Package
3-Wire Cascadable Serial Interface
Maximum DNL Error: 0.5LSB
Low Cost
APPLICATIONS
s
s
s
s
Digital Calibration
Industrial Process Control
Automatic Test Equipment
Cellular Telephones
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Daisy-Chained
Dual 12-Bit Rail-to-Rail DAC
Functional Block Diagram:
Control Outputs
LTC1454: 5V
LTC1454L: 3V TO 5V
9, 15
V
CC
LTC1454: 2.048V
10 LTC1454L: 1.22V
REFOUT
REFHI B 14
0.5
0.4
0.3
DNL ERROR (LSB)
+
4 D
IN
碌P
3 CLK
5 CS/LD
6 D
OUT
12-BIT
DAC B
24-BIT
SHIFT
REG
AND
DAC
LATCH
V
OUT B
16
0.2
0.1
0
鈥?.1
鈥?.2
鈥?.3
鈥?.4
鈥?.5
0
512 1024 1536 2048 2560 3072 3584 4095
CODE
1454 G08
鈥?/div>
X1/X2 B 1
REFHI A
11
+
12-BIT
DAC A
V
OUT A
8
鈥?/div>
X1/X2 A
7
POWER-ON
RESET
CLR
2
12
REFLO
GND
13
1454 BD02
U
U
U
Differential Nonlinearity
vs Input Code
1

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