Table of Contents Section 1 – New and Featured Products

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® Voltage Reference Products X60250 Programmable Voltage References Product Highlights • Non-volatile Digitally Adjustable 0V to 1.25V Reference Key Features • Reference voltage adjustable: — ±0.25% over 0V to 1.25V Range — ±0.10% over 0.625V to 1.25V Range • 20 ppm/°C temperature coefficient • On-Chip 8-bit 100kΩ Digitally Controlled Potentiometer • On-Chip Matched 100kΩ resistor for increased resolution over a smaller range • Programmable Resolution (255 steps): — 4.90mV over 0V to 1.25V Range — 2.45mV over 0.625V to 1.25V Range • 2.7V to 5.5V Supply Range • 2-Wire Interface for Programming Reference Setting • Low 20µA Supply current in normal mode • 8-pin TSSOP package Description The Xicor X60250 combines a temperature compensated voltage reference with a Xicor Digitally Controlled Potentiometer (XDCP) to provide a precision adjustable reference with a range of 0.0V to 1.25V. The device includes a serial bus interface to enable in-circuit programming of the reference voltage. The XDCP contains a resistor chain with 255 taps to provide 8 bits of digital adjustment to the reference voltage. Non-volatile storage retains the digital wiper setting, for permanent reference programming. An additional matched 100kΩ resistor is available to increase resolution of the output voltage while retaining accuracy. Block Diagram See Product Family Tree on page 2-3 New & Featured Products Benefits • Digital Programmability • Set and Forget Calibration • Reliability • Dynamic Controls — Real time calibration — Adaptive response • Non-volatile storage and recall of wiper position • General purpose EEPROM Pin Configuration VREFL VCC VREFOUT VOUT 1 2 3 4 TSSOP 8 7 6 5 SCL SDA GND R1 SCL SDA V CC V REFOUT 1.25V Reference Pwr On Recall 256 Tap DCP 100K V OUT EE PROM R 1 Serial Interface 100 kW Digital Wiper Control GND V REFL Ordering Information Ordering Number Output Voltage Resolution Package Operating Temperature Range X60250V8I 1.250V 8 bits 8-pin TSSOP -40°C to 85°C www.xicor.com 1–67
® Voltage Reference Products X64000 Voltage Reference with Programmable Temperature Compensation and Output Voltage Product Highlights Figure1: X64000 Transfer Curve Programmable VREF with Temperature Bias Correction Vout (V) Key Features • Programmable output generator consisting of both a bandgap reference and a voltage proportional to temperature • Non-volatile EEPROM storage of programming trim codes • Programmable absolute term (25°C) • Programmable temperature term (+/- linear ppm/C) • 2-wire interface • 2% total accuracy over temperature and Vcc range • 200 uA active current • -40°C to 85°C • 8-lead MSOP, 8-lead FCP (Bumped Chip Scale) Package Benefits • Programmable - Active Temperature Bias Voltage Pin Configuration X64000 xfer Curves 3 2.5 2 1.5 1 0.5 0 -50 0 50 100 Temp (C) Ptat[0] Ptat[255] 2*Ptat[0] 2*Ptat[255] Description The Xicor X64000 is a programmable voltage reference that provides an output voltage that is the combination of a programmable Proportional to Absolute Temperature (PTAT) analog voltage generator and a bandgap voltage reference. The 8 lead surface mount device requires less than 50 uA of DC current and no external components. The chip permits the user to program via 2-wire bus an analog voltage that is the sum of two terms: a temperature independent term as a function of Vref and a temperature dependent term as a function of the PTAT. See Equation 1. The PTAT term may be positive or negative (see transfer curve, Figure 1). Equation 1 where Vtemp = VPTAT = K*(T - T 0 ) AV is the selectable gain. Applications • Sensor Bias and Linearization • Data Acquisition Systems • Variable DAC reference • Linear Voltage Regulators • Amplifier biasing Block Diagram V CC MSOP A2 1 8 A1 2 7 Available: 2nd Half of 2004 A0 3 6 V SS 4 5 Also available in Flip-Chip V CC V OUT SDA SCL V TEMP V ref V SS V out Bias Code[2] Code[1] DAC DAC ∑ A Gain Select 1, 2, 3 TEST EEPROM 8 x 8 Communications and Registers SCL SDA A0 A1 A2 1–68 www.xicor.com
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