Low-Z Analog Switches Shave On-Resistance

The dual-supply, high-voltage SPST DG467, DG468, DG447, and DG448, and the SPDT DG449 analog switches manage to trim on-resistance values down to as low as 10Ω (DG467 and DG468) and 25Ω (DG447 and DG448). The devices are offered as drop-in replacements for MAX4647, MAX4648, and MAX4649 analog switches. The DG447 and DG467 SPST switches are normally closed, while the DG448 and DG468 SPST switches are normally open. The DG449 is an SPDT switch with one normally-open and one normally-closed contact. The devices operate from a single 7V to 36V supply or from dual ±4.5V to ±20V supplies. The SPDT DG449 specifies a 38-Ω on-resistance, reduces switching losses to less than 0.5 dB, and eliminates the need to adjust op amp gain. Each of the devices supports a ±15V analog-signal range and does not require a logic supply. Other shared features include rail-to-rail operation and TTL/CMOS compatible inputs. Prices range from $0.45 to $0.95 each/1,000. VISHAY INTERTECHNOLOGY INC., Malvern, PA. (408) 567-8347.