參數資料
| 型號： | LTC1428CS8-50#PBF |
| 廠商： | Linear Technology |
| 文件頁數： | 1/8頁 |
| 文件大小： | 0K |
| 描述： | IC DAC 8BIT SINK OUT 8-SOIC |
| 標準包裝： | 100 |
| 位數： | 8 |
| 數據接口： | 串行 |
| 轉換器數目： | 1 |
| 電壓電源： | 單電源 |
| 功率耗散（最大）： | 120µW |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 8-SOIC |
| 包裝： | 管件 |
| 輸出數目和類型： | 1 電流，單極 |
| 采樣率（每秒）： | * |
1
LTC1428-50
Micropower 8-Bit Current
Sink Output D/A Converter
FEATURES
DESCRIPTION
U
The LTC
1428-50 is a micropower 8-bit current sink
output D/A converter (DAC) with an output range of 0
A to
50
A. In 3.3V or 5V systems, the DAC IOUT pin can be
biased from 2V to 10V. Supply current is only 130
A.
Shutdown mode drops the supply current to 0.2
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 DIN 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.
APPLICATIONS
U
s
LCD Contrast Control
s
Backlight Brightness Control
s
Power Supply Voltage Adjustment
s
Battery Charger Voltage/Current Adjustment
s
GaAs FET Bias Adjustment
s
Trimmer Pot Elimination
s
Precision Full-Scale DAC Output Current
at 25
°C: 50A ±3%
s
Wide Output Voltage DC Compliance: 2V to 10V
s
Wide Supply Range: 3V
≤ VCC ≤ 6.5V
s
Supply Current in Shutdown: 0.2
A
s
Low Supply Current: 130
A
s
Available in 8-Pin SO
s
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
s
DAC Value Read Back Capability in 3-Wire Mode
s
DAC Powers Up at Midrange
s
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 APPLICATION
U
1
2
8
7
DOUT
DIN
IOUT
VCC
SHDN
CLK
LTC1428-50
GND
CS
1
F
2
CELLS
1428-50 TA01
VOUT
15.75V TO 27.75V IN STEPS OF 47mV
15mA FROM 2 CELLS
R1
240k
3
4
6
5
C1
0.1
F
LT
1307
L1
L1: 4.7
H MURATA-ERIE LQH3C
D1: MBR0530 OR 1N4148
D1
VIN
FB
VC
GND
SW
SHDN
R2
22k
R3
22k
100k
MPU
(e.g., 8051)
P1.3
P1.2
P1.1
P1.0
VCC
5V
4700pF
Digitally Controlled LCD Bias Generator (Standard 3-Wire Mode)
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