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PDF LTC1329CS8-10 Data sheet ( Hoja de datos )
| Número de pieza | LTC1329CS8-10 | |
| Descripción | Micropower 8-Bit Current Output D/A Converter | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1329-10/
LTC1329-50/LTC1329A-50
Micropower 8-Bit Current
Output D/A Converter
FEATURES
s Guaranteed Precision Full-Scale DAC Output
Current at 25°C:
LTC1329A-50 50µA ±1%
LTC1329-10 10µA ±3%
LTC1329-50 50µA ±3%
s Wide Output Voltage DC Compliance: – 15V to 2.5V
s Wide Supply Range: 2.7V ≤ VCC ≤ 6.5V
s Supply Current in Shutdown: 0.2µA
s Low Supply Current: 75µA for LTC1329-10,
95µA for LTC1329-50/LTC1329A-50
s Available in 8-Pin SO
s Triple ModeTM Interface Modes
1. Standard 3-Wire Mode
2. Pulse Mode 1-Wire Interface: Increment-Only
3. Pulse Mode 2-Wire Interface: Increment/Decrement
s Can Read Back the 8-Bit DAC Value 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 Battery Charger Current/Voltage Adjustment
s Power Supply Voltage Adjustment
s Trimmer Pot Elimination
DESCRIPTION
The LTC ®1329-10/LTC1329-50/LTC1329A-50 are
micropower 8-bit current output D/A converters (DACs)
with an output range of 0µA to 10µA for the LTC1329-10
and 0µA to 50µA for the LTC1329-50/LTC1329A-50. The
DAC current output can be biased from – 15V to 2V or
– 15V to 2.5V in 3.3V and 5V systems, respectively. Supply
current is only 95µA for the LTC1329-50/LTC1329A-50
and 75µA for LTC1329-10. A shutdown mode drops the
supply current to 0.2µA.
The LTC1329 can communicate with external circuitry by
using one of three interface modes: standard 3-wire serial
mode and two pulse modes. Upon power-up, the internal
counter resets to 1000 0000B, the DAC output assumes
midrange and the chip is configured in 3-wire or pulse
mode depending on the signal level at CS.
In 3-wire mode, the system MPU can serially transfer 8-bit
data to and from the LTC1329. In pulse mode, the upper
six bits of the DAC output can be programmed for incre-
ment-only (1-wire interface) or increment/decrement
(2-wire interface) operation depending on the signal level
at DIN.
LTC1329 is available in 8-pin SO packages.
, 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
VIN
5V
+
47µF
L1*
47Ω 100µH
ILIM VIN
SW1
LT®1173
FB
GND SW2
+
1N5818
*GOWANDA GA10-103K OR
COILTRONICS CTX100-4
1N4148
200k
4.7µF
10.1k
1N5818
+
22µF
0.1µF
1
IOUT
2
VCC
DOUT
DIN
8
7
LTC1329-50
3
SHDN
6
GND
4
CLK
5
CS
220k
VOUT
–22V at 40mA
MPU
(e.g., 8051)
P1.2
P1.1
P1.0
1329 TA01
1
1 page  
LTC1329-10/
LTC1329-50/LTC1329A-50
PIN FUNCTIONS
counter is configured in increment/decrement mode until
the power is cycled.
DOUT (Pin 8): Data Output. In 3-wire mode, on every
conversion DOUT serially outputs the previous 8-bit DAC
data. In pulse mode, DOUT is three-stated.
BLOCK DIAGRA
POWER-ON
RESET
CLK
DIN (UP/DN)
CS
SHDN
LATCH
AND
LOGIC
UP ONLY/
UP/DN
VOLTAGE
REFERENCE
SHDN
LATCH
AND
LOGIC
MODE SELECT
0 = PULSE
1 = 3-WIRE
VCC
8-BIT
SHDN CURRENT
DAC
8
CONTROL
LOGIC
CLK
8-BIT DAC REGISTER/COUNTER
UP/DN
88
CLK
DIN
9-BIT SHIFT REGISTER
DOUT
IOUT
DOUT
1329 BD
TEST CIRCUITS
Voltage Waveforms for tDO
CLK
0.8V
DOUT
t DO
2.4V
0.4V
1329 TC03
Load Circuit for tDO
1.4V
DOUT
3k
100pF
1329 TC01
Voltage Waveforms for tDZ, tDV
CS
0.8V
2.0V
DOUT HI-Z
SET HIGH
DOUT HI-Z
SET LOW
2.4V 90%
HI-Z
tDV tDZ
HI-Z
0.4V
10%
1329 TC04
Load Circuit for tDZ, tDV
DOUT
3k
100pF
5V tDZ WAVEFORM 2, tDV
tDZ WAVEFORM 1
1329 TC02
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LTC1329CS8-10.PDF ] | |
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