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LTC1427-50 Datasheet

  • LTC1427-50

  • Micropower, 10-Bit Current Output DAC with SMBus Serial Inte...

  • 8頁

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LTC1427-50
Micropower, 10-Bit Current
Output DAC with SMBus
Serial Interface
FEATURES
s
s
DESCRIPTION
The LTC
廬
1427-50 is a micropower, 10-Bit current output
DAC with an output range of 0碌A(chǔ) to 50碌A(chǔ). The DAC output is
guaranteed monotonic and DNL is less than 0.9LSB under all
operating conditions. Full-scale accuracy is
鹵2.5%
over
the commercial temperature range. The LTC1427-50 oper-
ates with power supply voltages from 2.7V to 5.5V and the
DAC current source output can be biased from (V
CC
鈥?1.3V)
to 鈥?15V.
The LTC1427-50 communicates with external circuitry by
using the SMBus serial interface. It acts as an SMBus slave
device using one of four selectable SMBus addresses set by
the two address pins AD0 and AD1 .
On power-up, the DAC output assumes midrange or zero
scale, depending on the logic state of the two address pins.
The LTC1427-50 can be shut down through the SHDN pin or
by setting the SHDN bit = 1 in the SMBus command byte.
Digital data for the DAC output is retained internally and the
supply current drops to 10碌A(chǔ) typically when in shutdown.
The LTC1427-50 is available in an 8-pin SO package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
s
s
s
s
s
s
s
Precision 50
碌
A,
鹵
1.5% Initial Full-Scale Output
Current,
鹵
2.5% Over Temperature
Wide Output Voltage DC Compliance: 鈥?15V to
(V
CC
鈥?1.3V)
Wide Supply Range: 2.7V
鈮?/div>
V
CC
鈮?/div>
5.5V
Supply Current in Shutdown: 10碌A(chǔ) Typ
Low Supply Current: 115碌A(chǔ) Typ
Available in 8-Pin SO
SMBus Serial Interface
Four Selectable SMBus Addresses
DAC Powers Up at Zero or Midscale
DAC Contents Are Retained in Shutdown
APPLICATIONS
s
s
s
s
s
LCD Contrast and Backlight Brightness Control
Power Supply Voltage Adjustment
Battery Charger Voltage/Current Adjustment
GaAs FET Bias Adjustment
Trimmer Pot Elimination
TYPICAL APPLICATION
Digitally Controlled LCD Bias Generator
L1
D1
V
OUT
*
6
V
IN
2 TO 4
CELLS
SHDN
1碌F
3
LT1317
SHDN
GND
4
FB
V
C
1
4700pF
100k
5
SW
2
R2
12.1k
1%
C1
1碌F
R1
226k
1%
LTC1427-50
1
2
3
4
SHDN
AD1
AD0
GND
V
CC
I
OUT
SCL
SDA
8
7
6
5
碌PU
(e.g., 8051)
P1.2
P1.1
P1.0
L1 = 10
碌H
SUMIDA CD43
MURATA-ERIE LQH3C
OR COILCRAFT DO1608
D1 =MBR0530
*V
OUT
= 12.7V TO 24V IN 11mV STEPS
15mA (2 CELLS)
35mA ( 3 CELLS)
U
U
U
V
CC
3.3V
1427 TA02
1

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