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參數資料
| 型號： | LTC1426I |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Micropower Dual 6-Bit PWM DAC |
| 中文描述： | 微功率雙路6位PWM DAC的 |
| 文件頁數： | 1/8頁 |
| 文件大?。?/td> | 222K |
| 代理商： | LTC1426I |
1
LTC1426
Micropower
Dual 6-Bit PWM DAC
FEATURES
DESCRIPTIO
N
U
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 V
REF
, allowing the full-
scale output to be varied by adjusting the voltage at V
REF
.
The PWM output frequency is typically 5kHz, easing
output filtering requirements. V
CC
supply current is typi-
cally 50
μ
A and drops to 0.2
μ
A 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.
I
Wide Supply Range: 2.7V
≤
V
CC
≤
5.5V
I
Wide Reference Voltage Range: 0V to 5.5V
I
Two Interface Modes:
Pulse Mode (Increment Only)
Pushbutton Mode (Increment/Decrement)
I
Low Supply Current: 50
μ
A
I
0.2
μ
A Supply Current in Shutdown
I
Available in 8-Pin MSOP and SO Packages
I
DAC Contents Are Retained in Shutdown
I
DACs Power-Up at Midrange
I
Low Output Impedance: <100
I
Output Frequency: 5kHz Typ
I
LCD Contrast and Backlight Brightness Control
I
Power Supply Voltage Adjustment
I
Battery Charger Voltage and Current Adjustment
I
GaAs FET Bias Adjustment
I
Trimmer Pot Elimination
APPLICATIO
S
U
TYPICAL APPLICATIO
N
U
Pushbutton Adjustable CCFL/LCD Contrast Generator
1
2
3
4
8
7
6
5
CLK1
CLK2
GND
PWM1
SHDN
V
CC
V
REF
PWM2
LTC1426
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CCFL PGND
I
CCFL
DIO
CCFL V
C
AGND
SHDN
LCD V
C
LCD PGND
CCFL V
SW
BULB
BAT
ROYER
V
IN
FBP
FBN
LCD V
SW
LT1182
1426 TA01
C4
0.1
μ
F
5V
DOWN
CONTRAST
UP/DOWN
CCFL UP/DOWN
DOWN
UP
UP
R
P1
47k
R
P2
47k
R
SHDN
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
LAMP
I
CCFL
= 0
μ
A TO 50
μ
A
C3
10
μ
F
C9
2.2
μ
F
5V
CONSULT THE LT1182 DATA SHEET FOR
DETAILS ON THE HIGH VOLTAGE ROYER
AND LCD CONTRAST CONVERTER SECTIONS
C2
1
μ
F
C10
2.2
μ
F
35V
8V TO
28V
C1
0.1
μ
F
C8
0.68
μ
F
C7 1
μ
F
R7
10k
HIGH VOLTAGE
ROYER
LCD
CONTRAST
CONVERTER
V
NEGATIVE
LCD CONTRAST
V
OUT
= –10V TO –30V
+
C11
2.2
μ
F
35V
+
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