LTC1427-50| Datasheet

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LTC1427-50 Micropower, 10-Bit Current Output DAC with SMBus Serial Interface
FEATURES
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DESCRIPTION
The LTC 1427-50 is a micropower, 10-Bit current output DAC with an output range of 0uA to 50uA. The DAC output is guaranteed monotonic and DNL is less than 0.9LSB under all operating conditions. Full-scale accuracy is 2.5% over the commercial temperature range. The LTC1427-50 operates with power supply voltages from 2.7V to 5.5V and the DAC current source output can be biased from (VCC 1.3V) to 15V. The LTC1427-50 communicates with external circuitry by using the SMBus serial interface. It acts as an SMBus slave device using one of four selectable SMBus addresses set by the two address pins AD0 and AD1 . On power-up, the DAC output assumes midrange or zero scale, depending on the logic state of the two address pins. The LTC1427-50 can be shut down through the SHDN pin or by setting the SHDN bit = 1 in the SMBus command byte. Digital data for the DAC output is retained internally and the supply current drops to 10uA typically when in shutdown. The LTC1427-50 is available in an 8-pin SO package.
, LTC and LT are registered trademarks of Linear Technology Corporation.

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Precision 50uA, 1.5% Initial Full-Scale Output Current, 2.5% Over Temperature Wide Output Voltage DC Compliance: 15V to (VCC 1.3V) Wide Supply Range: 2.7V VCC 5.5V Supply Current in Shutdown: 10uA Typ Low Supply Current: 115uA Typ Available in 8-Pin SO SMBus Serial Interface Four Selectable SMBus Addresses DAC Powers Up at Zero or Midscale DAC Contents Are Retained in Shutdown

APPLICATIONS
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LCD Contrast and Backlight Brightness Control Power Supply Voltage Adjustment Battery Charger Voltage/Current Adjustment GaAs FET Bias Adjustment Trimmer Pot Elimination

TYPICAL APPLICATION
Digitally Controlled LCD Bias Generator
L1 D1 VOUT* 6 VIN 2 TO 4 CELLS SHDN 1uF 3 LT1317 SHDN GND 4 FB VC 1 4700pF 100k 5 SW 2 R2 12.1k 1% C1 1uF R1 226k 1%

LTC1427-50 1 2 3 4 SHDN AD1 AD0 GND VCC IOUT SCL SDA 8 7 6 5 uPU (e.g., 8051) P1.2 P1.1 P1.0

L1 = 10 uH SUMIDA CD43 MURATA-ERIE LQH3C OR COILCRAFT DO1608 D1 =MBR0530

*VOUT = 12.7V TO 24V IN 11mV STEPS 15mA (2 CELLS) 35mA ( 3 CELLS)

VCC 3.3V

1427 TA02