LTC1329-10/ LTC1329-50/LTC1329A-50 Micropower 8-Bit Current Output D/A Converter FEATURES DESCRIPTION n Guaranteed Precision Full-Scale DAC Output The LTC 1329-10/LTC1329-50/LTC1329A-50 are Current at 25C: micropower 8-bit current output D/A converters (DACs) with an output range of 0A to 10A for the LTC1329-10 LTC1329A-50 50A 1% and 0A to 50A for the LTC1329-50/LTC1329A-50. The LTC1329-10 10A 3% DAC current output can be biased from 15V to 2V or LTC1329-50 50A 3% 15V to 2.5V in 3.3V and 5V systems, respectively. Supply n Wide Output Voltage DC Compliance: 15V to 2.5V current is only 95A for the LTC1329-50/LTC1329A-50 n Wide Supply Range: 2.7V V 6.5V CC and 75A for LTC1329-10. A shutdown mode drops the n Supply Current in Shutdown: 0.2A supply current to 0.2A. n Low Supply Current: 75A for LTC1329-10, 95A for LTC1329-50/LTC1329A-50 The LTC1329 can communicate with external circuitry by n Available in 8-Pin SO using one of three interface modes: standard 3-wire serial TM n Triple Mode Interface Modes mode and two pulse modes. Upon power-up, the internal 1. Standard 3-Wire Mode counter resets to 1000 0000B, the DAC output assumes 2. Pulse Mode 1-Wire Interface: Increment-Only midrange and the chip is configured in 3-wire or pulse mode depending on the signal level at CS. 3. Pulse Mode 2-Wire Interface: Increment/Decrement n Can Read Back the 8-Bit DAC Value in 3-Wire Mode In 3-wire mode, the system MPU can serially transfer 8-bit n DAC Powers Up at Midrange data to and from the LTC1329. In pulse mode, the upper n DAC Contents Are Retained in Shutdown six bits of the DAC output can be programmed for incre- ment-only (1-wire interface) or increment/decrement U APPLICATIONS (2-wire interface) operation depending on the signal level at D . IN n LCD Contrast Control n LTC1329 is available in 8-pin SO packages. Backlight Brightness Control , LTC and LT are registered trademarks of Linear Technology Corporation. n Battery Charger Current/Voltage Adjustment Triple Mode is a trademark of Linear Technology Corporation. n Power Supply Voltage Adjustment n Trimmer Pot Elimination TYPICAL APPLICATION Digitally Controlled LCD Bias Generator V IN 5V L1* 1N4148 47 200k 0.1F 100H 1 8 I D OUT OUT I V LIM IN 2 7 SW1 V D + CC IN 47F LT 1173 MPU LTC1329-50 FB (e.g., 8051) + 6 3 GND SW2 4.7F SHDN GND 10.1k 5 4 CLK CS P1.2 1N5818 1N5818 P1.1 P1.0 + 220k 22F *GOWANDA GA10-103K OR V OUT COILTRONICS CTX100-4 22V at 40mA 1329 TA01 1 U ULTC1329-10/ LTC1329-50/LTC1329A-50 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) ORDER PART Supply Voltage (V ) ................................................ 7V CC NUMBER TOP VIEW Input Voltage (All Inputs)............ 0.3V to (V + 0.3V) CC I 1 8 D LTC1329CS8-10 OUT OUT Output Voltage V 2 7 D (UP/DN) LTC1329CS8-50 CC IN I ......................................... 15V to (V + 0.3V) OUT CC LTC1329ACS8-50 SHDN 3 6 GND D ....................................... 0.3V to (V + 0.3V) OUT CC CLK CS 4 5 Short-Circuit Duration (All Outputs) ............... Indefinite S8 PART MARKING S8 PACKAGE Operating Temperature Range .................... 0C to 70C 8-LEAD PLASTIC SO 13291 1329A5 Storage Temperature Range ................. 65C to 150C T = 125C, = 150C/ W 13295 JMAX JA Lead Temperature (Soldering, 10 sec).................. 300C Consult factory for Industrial and Military grade parts. V = 3.3V, T = 25C, unless otherwise specified. ELECTRICAL CHARACTERISTICS CC A LTC1329-10 LTC1329-50/LTC1329A-50 SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS V l 2.7 6.5 2.7 6.5 V CC I Supply Current V = V = V = V , V = 0V, l 75 130 95 150 A CC SHDN DIN CS CC CLK D = NC, I = NC OUT OUT Shutdown l 0.2 5 0.2 5 A DAC Resolution 8 8 Bits DAC Full-Scale Current Output Voltage at I = 0.45V, T = 25C 9.7 10 10.3 48.5 50 51.5 A OUT A (LTC1329-10, LTC1329-50) l 9.5 10 10.5 47.5 50 52.5 A Output Voltage at I = 0.45V, T = 25C 49.5 50 50.5 A OUT A (LTC1329A-50) l 49.0 50 51.0 A DAC Zero-Scale Current Output Voltage at I = 0.45V l 200 200 nA OUT DAC Differential Monotonicity Guaranteed l 0.3 0.9 0.9 LSB Nonlinearity Supply Voltage Rejection V = 3V to 5.5V, I = Full Scale, l 1 2 1 2 LSB CC OUT Output Voltage at I = 0.45V OUT V = 2.7V to 6.5V, Full Scale, l 2.5 4 2.5 4 LSB CC Output Voltage at I = 0.45V OUT = 5V, I = Full Scale, l 0.25 1 0.25 LSB Output Voltage Rejection V CC OUT Output Voltage at I = 15V to 0V OUT V = 5V, I = Full Scale, l 1.5 1.5 LSB CC OUT Output Voltage at I = 0V to 2.5V OUT I , I Logic Input Current 0V V V l 1 1 A IH IL IN CC V High Level Input Voltage V = 5V l 2.0 2.0 V IH CC V = 3.3V l 1.9 1.9 V CC V Low Level Input Voltage V = 5V l 0.80 0.80 V IL CC V = 3.3V l 0.45 0.45 V CC V High Level Output Voltage V = 5V, I = 400A l 2.4 2.4 V OH CC O V = 3.3V, I = 400A l 2.1 2.1 V CC O V Low Level Output Voltage V = 5V, I = 2mA l 0.4 0.4 V OL CC O V = 3.3V, I = 1mA l 0.4 0.4 V CC O I Three-State Output Leakage V = V l 5 5 A OZ CS CC 2 U W U W U WW