LTC1427-50 Datasheet | Linear Technology

LTC1427-50 Micropower, 10-Bit Current Output DAC with SMBus Serial Interface Features s s DESCRIPTION The LTC®1427-50 is a micropower, 10-Bit current output DAC with an output range of 0µA to 50µA. 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 mercial 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 municates 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 mand byte. Digital data for the DAC output is retained internally and the supply current drops to 10µA 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. s s s s s s s s Precision 50µA, ± 1.5% Initial Full-Scale Output Current, ±2.5% Over Temperature Wide Output Voltage DC pliance: - 15V to (VCC - 1.3V) Wide Supply Range: 2.7V ≤ VCC ≤ 5.5V Supply Current in Shutdown: 10µA Typ Low Supply Current: 115µA 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 U APPLICATIONS s s s s s LCD Contrast and Backlight Brightness Control Power Supply Voltage Adjustment Battery Charger Voltage/Current Adjustment Ga As FET Bias Adjustment Trimmer Pot Elimination TYPICAL APPLICATION Digitally Controlled LCD Bias Generator L1 D1 VOUT- 6 VIN 2 TO 4 CELLS SHDN 1µF 3 LT1317 SHDN GND 4 FB VC 1 4700p F 100k 5 SW 2 R2 12.1k 1% C1 1µF R1 226k 1% LTC1427-50 1 2 3 4...