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ISL21400 Datasheet(PDF) 1 Page - Renesas Technology Corp |
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ISL21400 Datasheet(HTML) 1 Page - Renesas Technology Corp |
1 / 17 page FN8091 Rev 3.00 Page 1 of 17 March 31, 2011 FN8091 Rev 3.00 March 31, 2011 ISL21400 Programmable Temperature Slope Voltage Reference DATASHEET The ISL21400 features a precision voltage reference combined with a temperature sensor whose output voltage varies linearly with temperature. The precision 1.20V reference has a very low temperature coefficient (tempco), and its output voltage is scaled by an internal DAC (VREF) to produce a temperature stable output voltage that is programmable from 0V to 1.20V. The output voltage from the temperature sensor (VTS) is summed with VREF to produce a temperature dependent output voltage. The slope of the VTS portion of the output voltage can be programmed to be positive or negative in the range -2.1mV/°C to +2.1mV/°C. A programmable gain amplifier (PGA) sums the VTS and the VREF voltages and provides gains of 1x, 2x, and 4x to scale the output up to 4.8V and the slope to ±8.4mV/°C. The VREF and VTS terms are programmable with 8 bits of resolution via an I2C bus and the values are stored in non-volatile registers. The PGA gain is also set via the I2C bus and the value is stored in a non-volatile register. Non-volatile memory storage assures the programmed settings are retained on power-down, eliminating the need for software initialization at device power-up. Temperature Characteristics Curve Features • Programmable reference voltage • Programmable temperature slope • Programmable Gain Amplifier • Non-volatile storage of programming registers •I2C serial interface • 2% total accuracy over temperature and VCC range • 200µA typical active supply current • Operating temperature range = -40°C to +85°C • 8 Ld MSOP package • Pb-free (RoHS compliant) Applications • RF power amplifier bias compensation • LCD bias compensation • Laser diode bias compensation • Sensor bias and linearization • Data acquisition systems • Variable DAC reference • Amplifier biasing Pinout ISL21400 (8 LD MSOP) TOP VIEW 0.0 0.5 1.0 1.5 2.0 2.5 3.0 -40 -15 10 35 60 85 TEMPERATURE (°C) TS = 0 TS = 255 TS = 127 TS = 0 TS = 127 TS = 255 AV = 2 AV = 1 Pin Descriptions MSOP SYMBOL DESCRIPTION 1 A2 Hardwire slave address pin for I2C serial bus 2 A1 Hardwire slave address pin for I2C serial bus 3 A0 Hardwire slave address pin for I2C serial bus 4VSS Ground pin 5 SCL Serial bus clock input 6 SDA Serial bus data input/output 7 VOUT Output voltage 8VCC Device power supply A2 VCC 1 2 3 4 SDA SCL 8 7 6 5 A0 VOUT VSS A1 |
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