The MAX5436MAX5439 are 128-tap high-voltage (5V to 15V) digital potentiometers in packages that are half the size of comparable devices in 8-pin SO. They perform the same function as mechanical potentiometers, but replace the mechanics with a simple digital interface. The digital logic is powered by a separate single +2.7V to +5.25V supply voltage (VCC). The resistor string uses its own analog supplies (V DD and V SS ) that require VDD - VSS to be greater than 9V and less than 31.5V. This allows for greater flexibility in voltage ranges that can be used with these devices. Examples of analog supply ranges include not only dual voltages of 5V to 15V, but single-supply voltages, such as +10V, +15V, +30V, -30V, and more, as long as the ranges of VDD - VSS and VCC VSS are met. The MAX5437/MAX5439 include an on-chip, highvoltage, uncommitted amplifier, providing additional reductions in board space and cost. Other features include low 35ppm/C end-to-end and 5ppm/C ratiometric resistor temperature coefficients, a 3-wire SPITM/ QSPITM/MICROWIRETM-compatible serial interface, and a power-on reset to midscale.