ISL21400

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
• 200A typical active supply current
• Operating temperature range = -40 to +85
• 8 Ld MSOP package




Application

• 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






Specifications

Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . -1V to 6.5V
Storage Temperature Range . . . . . . . . . . . . . . . . . .-65 to +150
Voltage on V_OUT Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0V to V_CC
Voltage on All Other Pins . . . . . . . . . . . . . . . . . . -0.3V to V_CC+0.3V
Lead Temperature (Soldering, 10s) . . . . . . . . . . . . . . . . . . . .+300
ESD Rating
Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2kV
Machine Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200V




Description

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.