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參數資料
型號: LTC1426IS8#PBF
廠商: Linear Technology
文件頁數: 1/8頁
文件大?。?/td> 0K
描述: IC PWM D/A CONV 6BIT DUAL 8-SOIC
標準包裝: 100
位數: 6
數據接口: 串行
轉換器數目: 2
電壓電源: 單電源
功率耗散(最大): 550µW
工作溫度: -40°C ~ 85°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: 2 電壓,單極
采樣率(每秒): *
1
LTC1426
Micropower
Dual 6-Bit PWM DAC
FEATURES
DESCRIPTION
U
s
Wide Supply Range: 2.7V
≤ VCC ≤ 5.5V
s
Wide Reference Voltage Range: 0V to 5.5V
s
Two Interface Modes:
Pulse Mode (Increment Only)
Pushbutton Mode (Increment/Decrement)
s
Low Supply Current: 50
A
s
0.2
A Supply Current in Shutdown
s
Available in 8-Pin MSOP and SO Packages
s
DAC Contents Are Retained in Shutdown
s
DACs Power-Up at Midrange
s
Low Output Impedance: < 100
s
Output Frequency: 5kHz Typ
The LTC
1426 is a dual micropower 6-bit PWM DAC
featuring versatile PWM outputs and a flexible pushbutton
compatible digital interface. The DAC outputs provide a
PWM signal that swings from 0V to VREF, allowing the full-
scale output to be varied by adjusting the voltage at VREF.
The PWM output frequency is typically 5kHz, easing
output filtering requirements. VCC supply current is typi-
cally 50
A and drops to 0.2A in shutdown.
The LTC1426 can be controlled using one of two interface
modes: pushbutton and pulse. The LTC1426 automati-
cally configures itself into the appropriate mode at start-
up by monitoring the state of the CLK pins. In pushbutton
mode, the CLK pins can be directly connected to external
pushbuttons to control the DAC output. In pulse mode,
the CLK pins can be connected to CMOS compatible
logic. The DAC outputs initially power up at half scale and
the contents of the internal DAC registers are retained in
shutdown.
The LTC1426 is available in 8-pin MSOP and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
LCD Contrast and Backlight Brightness Control
s
Power Supply Voltage Adjustment
s
Battery Charger Voltage and Current Adjustment
s
GaAs FET Bias Adjustment
s
Trimmer Pot Elimination
APPLICATIONS
U
TYPICAL APPLICATION
U
Pushbutton Adjustable CCFL/LCD Contrast Generator
1
2
3
4
8
7
6
5
CLK1
CLK2
GND
PWM1
SHDN
VCC
VREF
PWM2
LTC1426
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CCFL PGND
ICCFL
DIO
CCFL VC
AGND
SHDN
LCD VC
LCD PGND
CCFL VSW
BULB
BAT
ROYER
VIN
FBP
FBN
LCD VSW
LT1182
1426 TA01
C4
0.1
F
5V
DOWN
CONTRAST
UP/DOWN
CCFL UP/DOWN
DOWN
UP
RP1
47k
RP2
47k
RSHDN
1M
SHDN
R5
20k
1%
R6
40k
1%
R4
4.99k
1%
R3
5.1k
1%
R1
44.2k
1%
R2
44.2k
1%
UP TO 6mA
ICCFL = 0A TO 50A
C3
10
F
C9
2.2
F
5V
CONSULT THE LT1182 DATA SHEET FOR
DETAILS ON THE HIGH VOLTAGE ROYER
AND LCD CONTRAST CONVERTER SECTIONS
C2
1
F
C10
2.2
F
35V
8V TO
28V
C1
0.1
F
C8
0.68
F
C7 1
F
R7
10k
HIGH VOLTAGE
ROYER
LAMP
LCD
CONTRAST
CONVERTER
VOUT
NEGATIVE
LCD CONTRAST
VOUT = –10V TO –30V
+
C11
2.2
F
35V
+
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