AN_952| Application Note
AN-952 APPLICATION NOTE
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ADG9xx Wideband CMOS Switches: Frequently Asked Questions
by Theresa Corrigan
INTRODUCTION
The ADG9xx CMOS wideband switches are designed primarily to meet the requirements of devices transmitting at industrial, scientific, and medical (ISM) band frequencies (900 MHz). The low insertion loss, high isolation between ports, low distortion, and low current consumption of these devices make them an excellent solution for many high frequency applications that require low power consumption and the ability to handle transmitted power (up to 16 dBm). Typical applications include high speed filtering and data routing. Table 1. Key Specifications for the ADG9xx Series
Power Supply 1.65 V to 2.75 V 1.65 V to 2.75 V 1.65 V to 2.75 V 1.65 V to 2.75 V 1.65 V to 2.75 V 1.65 V to 2.75 V 1.65 V to 2.75 V 1.65 V to 2.75 V Insertion Loss @ 1 GHz (dB) -0.8 Isolation @ 1 GHz (dB) -37 Maximum Input Power, No DC Bias (dBm) 7 Maximum Input Power with 0.5 V DC Bias (dBm) 16
Complete specifications for each part (ADG901, ADG902, ADG904, ADG904R, ADG918, ADG919, ADG936, and ADG936R) can be found in the data sheets available from Analog Devices, Inc., and should be consulted in conjunction with this application note. This application note addresses some of the frequently asked questions about these parts. A full list of ADG9xx parts is shown in Table 1.
Part No. ADG901
Function 1 1 SPST; Absorptive 1 SPST; Reflective 1 SPDT; Absorptive 1 x SPDT; Reflective 2 SPDT; Absorptive 2 SPDT; Reflective 4:1 Mux; Absorptive 4 SPDT; Reflective
ADG902
-0.8
-37
7
16
ADG918
-0.8
-43
7
16
ADG919
-0.8
-43
7
16
ADG936
-0.9
-36
7
16
ADG936R
-0.9
-36
7
16
ADG904
-1.1
-37
7
16
ADG904R
-1.1
-37
7
16
Package 8-Lead MSOP and 8-Lead 3 mm 3 mm LFCSP 8-Lead MSOP and 8-Lead 3 mm 3 mm LFCSP 8-Lead MSOP and 8-Lead 3 mm 3 mm LFCSP 8-Lead MSOP and 8-Lead 3 mm 3 mm LFCSP 20-Lead TSSOP; 20-Lead, 4 mm 4 mm LFCSP 20-Lead TSSOP; 20-Lead, 4 mm 4 mm LFCSP 20-Lead TSSOP; 20-Lead, 4 mm 4 mm LFCSP 20-Lead TSSOP; 20-Lead, 4 mm 4 mm LFCSP
1
Absorptive (matched): switch with 50 terminated shunts to ground. Reflective: switch with 0 terminated shunts to ground.
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