DS4305 Rev 1 8/06 Electronically Programmable Voltage Reference General Description Features The DS4305 is a nonvolatile (NV) electronically pro- Precise Electronically Adjustable Voltage grammable voltage reference. The reference voltage is Reference programmed in-circuit during factory calibration/ Enables Automated Factory Trimming of Devices programming. Programming the reference voltage, V , is as simple as applying the desired voltage on Needing Voltage Adjustment OUT V and toggling the adjust pin (ADJ) to lock the V IN OUT Can be Adjusted to Within 1.5mV voltage level indefinitely, even if the device is power Wide Adjustable Output Voltage Range Within cycled. The DS4305 replaces current cumbersome fac- tory adjustment arrangements with a low-cost solution 300mV of the Supply Rails that can be adjusted using automated techniques. In Low Temperature Coefficient addition, the DS4305 has the ability to be readjusted after the unit has been fully assembled and tested. This 1mA of Output-Current Drive results in a much more flexible manufacturing arrange- NV Memory Stores the Voltage Indefinitely ment, lower inventory costs, and a quicker time-to-market. Output Short-Circuit Protection Low Cost Low Power Consumption Applications 4.0V to 5.5V Single-Supply Operation Power-Supply Calibration Small 5-Lead SOT23 Package Threshold Setting Offset Nulling -40C to +125C Temperature Operation Bias Adjusting DS4305K Evaluation Kit is Available Power Amps Pressure Bridges Ordering Information Factory-Calibrated Equipment PIN- SOT PART TEMP RANGE PACKAGE MARK DS4305R+T&R -40C to +125C 5 SOT23 4305+ +Denotes lead-free package. Typical Operating Circuit Pin Configuration TOP VIEW EXISTING SOLUTION DS4305 SOLUTION V CC ADJ15V CC REFERENCE VOLTAGE V CC DS4305 REFERENCE GND 2 V OUT SHUNT VOLTAGE DS4305 VOLTAGE GND REFERENCE V ADJ IN HAND-SELECTED 0.1% RESISTOR V34 V IN OUT OR MECHANICAL POT ACCESS FOR SOT23 AUTOMATED ALIGNMENT Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLEElectronically Programmable Voltage Reference ABSOLUTE MAXIMUM RATINGS Voltage on V Relative to GND...........................-0.5V to +6.0V EEPROM Programming Adjust Temperature..........0C to +70C CC Voltage on V , ADJ, and V V to GND Short-Circuit Duration .........................Continuous IN OUT OUT Relative to GND ...-0.5V to (V + 0.5V), not to exceed +6.0V Storage Temperature Range .............................-55C to +125C CC Operating Temperature Range .........................-40C to +125C Soldering Temperature...See IPC/JEDEC J-STD-020 Specification Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED OPERATING CONDITIONS (T = -40C to +125C) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V (Note 1) 4.0 5.5 V CC V Voltage Range V 0.3 V - 0.3 V IN IN CC ADJ Logic 0 V -0.3 0.3 x V V IL CC V Current V -1 +1 mA OUT OUTI V Load V 100 pF OUT OUTL ELECTRICAL CHARACTERISTICS (V = +4.0V to +5.5V, T = -40C to +125C, unless otherwise noted.) CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS -40C to +85C V , ADJ, and IN 1.4 2.0 V = open circuit OUT Supply Current I mA IN +85C to +125C V , ADJ, and IN 2.1 V = open circuit OUT V Resistance R 95 k IN PD ADJ Pullup Resistance R 18 k PU V Voltage Range V (Note 1) 0.3 V - 0.3 V OUT OUTR C C V Tracking Accuracy V (Note 2) 20 mV OUT OUTTA V Quantization V (Note 3) 1.5 mV OUT OUTQ -40C to +85C, V = 0.7V 56 V/C OUT -40C to +25C, V = 5.0V, V 734 60 OUT CC 5.3V V Temperature Coefficient V OUT OUT TC +25C to +85C, V = 5.0V, V -24 -7 +10 ppm/C OUT CC 5.3V +85C to +125C, V = 5.0V, V -43 -23 -3 OUT CC 5.3V -40C to +85C -1.6 +1.8 V Line Regulation V mV/V OUT OUT LN +1.8 +85C to +125C -1.6 -40C to +85C, -1mA V +1mA 2.0 OUT I V Load Regulation V mV/mA OUT OUT LD + 85C to + 125C , -1.0 m A V + 1.0m A 2.5 OUT I Long-Term Stability V 1000 hours at +25C ppm OUTLTS e 0.1Hz f 10Hz 160 V n1 P-P V Noise OUT e 10Hz f 1kHz 23 V n2 RMS 2 DS4305