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LTC1428CS8-50 Datasheet

  • LTC1428CS8-50

  • Micropower 8-Bit Current Sink Output D/A Converter

  • 8頁

  • LINER

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LTC1428-50
Micropower 8-Bit Current
Sink Output D/A Converter
FEATURES
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s
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s
s
s
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DESCRIPTION
The LTC
廬
1428-50 is a micropower 8-bit current sink
output D/A converter (DAC) with an output range of 0碌A(chǔ) to
50碌A(chǔ). In 3.3V or 5V systems, the DAC I
OUT
pin can be
biased from 2V to 10V. Supply current is only 130碌A(chǔ).
Shutdown mode drops the supply current to 0.2碌A(chǔ).
The LTC1428-50 communicates with external circuitry by
using one of three interface modes: standard 3-wire serial
mode or one of two pulse modes. Upon power-up, the
internal counter resets to 10000000B, the DAC output
assumes midrange and the chip configures to 3-wire or
pulse mode depending on the CS signal level.
In 3-wire mode, the system MPU can serially transfer
8-bit data to and from the LTC1428-50. In pulse mode, the
upper six bits of the DAC output program for increment-
only (1-wire interface) or increment/decrement (2-wire
interface) operation depending on the D
IN
signal level. In
increment-only mode, the counter rolls over and sets the
DAC to zero if the counter increases beyond full scale. In
increment/decrement mode, the counter stops
incrementing at full scale, stops decrementing at zero
scale and does not roll over.
LTC1428-50 is available in an 8-pin SO package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Triple Mode is a trademark of Linear Technology Corporation.
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Precision Full-Scale DAC Output Current
at 25擄C: 50碌A(chǔ)
鹵3%
Wide Output Voltage DC Compliance: 2V to 10V
Wide Supply Range: 3V
鈮?/div>
V
CC
鈮?/div>
6.5V
Supply Current in Shutdown: 0.2碌A(chǔ)
Low Supply Current: 130碌A(chǔ)
Available in 8-Pin SO
Triple Mode
TM
Interface
1. Standard 3-Wire Mode
2. 1-Wire Pulse Mode Interface: Increment-Only
3. 2-Wire Pulse Mode Interface: Increment/Decrement
DAC Value Read Back Capability in 3-Wire Mode
DAC Powers Up at Midrange
DAC Contents Are Retained in Shutdown
APPLICATIONS
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LCD Contrast Control
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 (Standard 3-Wire Mode)
L1
D1
V
OUT
15.75V TO 27.75V IN STEPS OF 47mV
15mA FROM 2 CELLS
5V
1
R2
22k
R3
22k
2
I
OUT
V
CC
D
OUT
D
IN
8
7
V
CC
MPU
(e.g., 8051)
P1.3
P1.2
P1.1
P1.0
1428-50 TA01
R1
240k
SHDN
2
CELLS
1碌F
V
IN
SHDN
SW
LT
廬
1307
FB
GND
V
C
4700pF
100k
L1: 4.7碌H MURATA-ERIE LQH3C
D1: MBR0530 OR 1N4148
C1
0.1碌F
LTC1428-50
3
4
SHDN
CLK
GND
CS
6
5
U
U
U
1

LTC1428CS8-50 產(chǎn)品屬性

  • LTC1428-50

  • 100

  • 集成電路 (IC)

  • 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器

  • -

  • -

  • 8

  • 串行

  • 1

  • 單電源

  • 120µW

  • 0°C ~ 70°C

  • 表面貼裝

  • 8-SOIC（0.154"，3.90mm 寬）

  • 8-SOIC

  • 管件

  • 1 電流，單極

  • *

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