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PDF LTC1428CS8-50 Data sheet ( Hoja de datos )
| Número de pieza | LTC1428CS8-50 | |
| Descripción | Micropower 8-Bit Current Sink Output D/A Converter | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1428-50
Micropower 8-Bit Current
Sink Output D/A Converter
FEATURES
s Precision Full-Scale DAC Output Current
at 25°C: 50µA ±3%
s Wide Output Voltage DC Compliance: 2V to 10V
s Wide Supply Range: 3V ≤ VCC ≤ 6.5V
s Supply Current in Shutdown: 0.2µA
s Low Supply Current: 130µA
s Available in 8-Pin SO
s Triple ModeTM 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
U
APPLICATIONS
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
DESCRIPTION
The LTC®1428-50 is a micropower 8-bit current sink
output D/A converter (DAC) with an output range of 0µA to
50µA. In 3.3V or 5V systems, the DAC IOUT pin can be
biased from 2V to 10V. Supply current is only 130µA.
Shutdown mode drops the supply current to 0.2µA.
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Triple Mode is a trademark of Linear Technology Corporation.
TYPICAL APPLICATION
Digitally Controlled LCD Bias Generator (Standard 3-Wire Mode)
L1 D1
2
CELLS
SHDN
1µF
L1: 4.7µH MURATA-ERIE LQH3C
D1: MBR0530 OR 1N4148
VIN
SHDN
SW
LT®1307
FB
GND VC
4700pF
100k
R1
240k
R2
22k
R3
22k
VOUT
15.75V TO 27.75V IN STEPS OF 47mV
15mA FROM 2 CELLS
C1
0.1µF
1
IOUT
2
VCC
DOUT
DIN
8
7
LTC1428-50
3
SHDN
6
GND
4
CLK
5
CS
5V
VCC
MPU
(e.g., 8051)
1428-50 TA01
P1.3
P1.2
P1.1
P1.0
1
1 page  
BLOCK DIAGRA
POWER-ON
RESET
CLK
DIN
CS
SHDN
LTC1428-50
LATCH
AND
LOGIC
UP ONLY/
UP/DN
VOLTAGE
REFERENCE
SHDN
LATCH
AND
LOGIC
MODE SELECT
0 = PULSE
1 = SPI
SHDN
8-BIT
CURRENT
DAC
8
CONTROL
LOGIC
CLK
8-BIT REGISTER/COUNTER
UP/DN
88
CLK
9-BIT SHIFT REGISTER
DOUT (LSB)
Q9
IOUT
DOUT
1428-50 BD
TEST CIRCUITS
Load Circuit for tDO
1.4V
DOUT
3k
100pF
1428-50 TC01
Voltage Waveforms for tDO
CLK
0.8V
DOUT
t DO
2.4V
0.4V
1428-50 TC03
Load Circuit for tDZ, tDV
DOUT
3k
100pF
5V tDZ WAVEFORM 2, tDV
tDZ WAVEFORM 1
1428-50 TC02
Voltage Waveforms for tDZ, tDV
CS
0.8V
2.0V
DOUT
WAVEFORM 1
(SEE NOTE 1)
DOUT
WAVEFORM 2
(SEE NOTE 2)
2.4V
t DV
0.4V
t DZ
90%
10%
NOTE 1: WAVEFORM 1 IS FOR AN OUTPUT WITH INTERNAL
CONDITIONS SUCH THAT THE OUTPUT IS HIGH UNLESS
DISABLED BY CS
NOTE 2: WAVEFORM 2 IS FOR AN OUTPUT WITH INTERNAL
CONDITIONS SUCH THAT THE OUTPUT IS LOW UNLESS
DISABLED BY CS
1428-50 TC04
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LTC1428CS8-50.PDF ] | |
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