LTC2488 FUNCTIONAL BLOCK DIAGRAM INTERNAL VCC OSCILLATOR GND AUTOCALIBRATION FO AND CONTROL (INT/EXT) REF+ REF– CH0 – + IN+ CH1 DIFFERENTIAL SDI CH2 MUX 3RD ORDER IN– SERIAL SCK CH3 ΔΣ MODULATOR INTERFACE SDO COM CS DECIMATING FIR ADDRESS 2488 BD Figure 1. Functional Block DiagramTEST CIRCUITS VCC 1.69k SDO SDO 1.69k CLOAD = 20pF CLOAD = 20pF Hi-Z TO VOH Hi-Z TO V V OL OL TO VOH V V OH TO VOL 2488 TC01 OH TO Hi-Z V 2488 TC02 OL TO Hi-Z 2488fb For more information www.linear.com/LTC2488 9