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參數(shù)資料
| 型號： | LTC1428CS8-50 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | DAC |
| 英文描述： | Micropower 8-Bit Current Sink Output D/A Converter |
| 中文描述： | SERIAL INPUT LOADING, 8-BIT DAC, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SOP-8 |
| 文件頁數(shù)： | 1/8頁 |
| 文件大小： | 235K |
| 代理商： | LTC1428CS8-50 |
1
LTC1428-50
Micropower 8-Bit Current
Sink Output D/A Converter
FEATURES
DESCRIPTIO
N
U
The LTC
1428-50 is a micropower 8-bit current sink
output D/A converter (DAC) with an output range of 0
μ
A to
50
μ
A. In 3.3V or 5V systems, the DAC I
OUT
pin can be
biased from 2V to 10V. Supply current is only 130
μ
A.
Shutdown mode drops the supply current to 0.2
μ
A.
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.
APPLICATIO
S
U
I
LCD Contrast Control
I
Backlight Brightness Control
I
Power Supply Voltage Adjustment
I
Battery Charger Voltage/Current Adjustment
I
GaAs FET Bias Adjustment
I
Trimmer Pot Elimination
I
Precision Full-Scale DAC Output Current
at 25
°
C: 50
μ
A
±
3%
I
Wide Output Voltage DC Compliance: 2V to 10V
I
Wide Supply Range: 3V
≤
V
CC
≤
6.5V
I
Supply Current in Shutdown: 0.2
μ
A
I
Low Supply Current: 130
μ
A
I
Available in 8-Pin SO
I
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
I
DAC Value Read Back Capability in 3-Wire Mode
I
DAC Powers Up at Midrange
I
DAC Contents Are Retained in Shutdown
, LTC and LT are registered trademarks of Linear Technology Corporation.
Triple Mode is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
N
U
1
2
8
7
D
OUT
D
IN
I
OUT
V
CC
SHDN
CLK
LTC1428-50
GND
CS
1
μ
F
2
CELLS
1428-50 TA01
V
OUT
15.75V TO 27.75V IN STEPS OF 47mV
15mA FROM 2 CELLS
R1
240k
3
4
6
5
C1
0.1
μ
F
LT
1307
L1
L1: 4.7
μ
H MURATA-ERIE LQH3C
D1: MBR0530 OR 1N4148
D1
V
IN
FB
V
C
GND
SW
SHDN
SHDN
R2
22k
R3
22k
100k
MPU
(e.g., 8051)
P1.3
P1.2
P1.1
P1.0
V
CC
5V
4700pF
Digitally Controlled LCD Bias Generator (Standard 3-Wire Mode)
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