±15V, 128-Tap, Low-Drift Digital PotentiometersFunctional Diagrams VCC VCC H H R R R R 7 7-BIT 7 128 7 7-BIT 7 128 DECODE W DECODE W 7-BIT LATCH 7-BIT LATCH SHIFT SHIFT REGISTER REGISTER DIN L DIN L MAX5437/ VDD VDD MAX5439 VSS V SCLK MAX5436/ SCLK SS POR CLOCK POR CLOCK MAX5438 OUT LOGIC LOGIC CS CS GND GND IN+ IN- SHDN MAX5436–MAX5439Chip Information TRANSISTOR COUNT: 2556 PROCESS: BiCMOS 10______________________________________________________________________________________