EVAL-ADG902EBZ Analog Devices

EVAL-ADG901EBZ/EVAL-ADG902EBZ/ EVAL-ADG918EBZ/EVAL-ADG919EBZ User Guide UG-676 One Technology Way P.O. Box 9106 Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 Fax: 781.461.3113 www.analog.com Evaluation Board for the ADG901/ADG902 and ADG918/ADG919 Wideband Absorptive/Reflective Switches FEATURES GENERAL DESCRIPTION Evaluation board for the ADG901/ADG902 SPST and the This user guide describes the evaluation board for the ADG918/ADG919 SPDT switches ADG901/ADG902 and ADG918/ADG919 switches. RF through for board calibration The ADG901/ADG902 (SPST) and the ADG918/ADG919 (SPDT) are wideband switches using a CMOS process to provide high isolation and low insertion loss to 1 GHz. Full data on the ADG901/ADG902 and the ADG918/ADG919 is available in their respective data sheets available from Analog Devices and should be consulted in conjunction with this user guide when using the evaluation board. TYPICAL SETUP J6 J7 VDD IN RF1 C4 J2 C3 RFC R1 C1 RF2 J1 J3 EVAL-ADG901/02/18/19EB WIDEBAND (>GHz) CAL CAL CMOS SWITCH J4 J5 Figure 1. ADG901/ADG902/ADG918/ADG919 Evaluation Board PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. B Page 1 of 4 C2 12159-001EVAL-ADG901EBZ/EVAL-ADG902EBZ/EVAL-ADG918EBZ/EVAL-ADG919EBZ User Guide UG-676 OPERATING THE ADG901/ADG902 AND THE ADG918/ADG919 EVALUATION BOARD This evaluation board allows designers to evaluate the high- A 10 F surface-mount tantalum decoupling capacitor is performance SPST and SPDT wideband switches with a provided on the VDD line and two 10 pF ceramic capacitors are minimum of effort. placed close to the DUT on both the VDD pin and the CTRL pin. Unpopulated component positions are available for the user to To prove that these devices meet the users requirements, use a apply extra components to meet their design application. power supply and a network analyzer. V DD CTRL POWER SUPPLIES J6 J7 This evaluation board has two analog power supply inputs: VDD VDD IN and CTRL. V can equal 1.65 V to 2.75 V. DD RF1 C4 The CTRL inputs are both CMOS and LVTTL compatible. For J2 operation of the ADG901/ADG902 evaluation board, see RF2 C3 RFC Table 1 for setup conditions. For operation of the ADG918/ R1 ADG919 evaluation board, see Table 2 for setup conditions. C1 RF2 RF1 Table 1. Truth Table ADG901/ADG902 J1 CTRL Signal Path GND 0 RF1 isolated from RF2 J3 1 RF1 to RF2 EVAL-ADG901/02/18/19EB WIDEBAND (>GHz) CAL CAL Table 2. Truth Table ADG918/ADG919 CMOS SWITCH J5 J4 CTRL Signal Path CAL 0 RF2 to RFC 1 RF1 to RFC Figure 2. ADG901/ADG902 Top View ADG901/ADG902 V CTRL DD The RF1 port, see Figure 2, is connected through a 50 transmission line to the top left SMA connector, J1. RF2 is J6 J7 connected through 50 transmission lines to the top SMA VDD IN RF1 connector, J2. The port labeled RF2 is ground connect to C4 ground when evaluating ADG901/ADG902. A through J2 transmission line connects J4 and J5 and this transmission line RF1 C3 RFC is used to estimate the loss of the PCB over the environmental R1 C1 conditions being evaluated. RF2 RFC ADG918/ADG919 J1 RF2 The RFC port, see Figure 3, is connected through a 50 transmission line to the top left SMA connector, J1. RF1 and J3 EVAL-ADG901/02/18/19EB RF2 are connected through 50 transmission lines to the top WIDEBAND (>GHz) CAL CAL two SMA connectors, J2 and J3, respectively. A through CMOS SWITCH J4 J5 transmission line connects J4 and J5 and this transmission line is used to estimate the loss of the PCB over the environmental CAL conditions being evaluated. The board is constructed of a four layer, FR4 material with a Figure 3. ADG918/ADG919 Top View dielectric constant of approximately 4.3. The total board thickness is 0.062. Two ground layers with grounded planes provide ground for the RF transmission lines. The transmission lines were designed using a coplanar waveguide with the ground plane model using a trace width of 0.052, clearance to the ground plane of 0.030, dielectric thickness of 0.029 and a metal thickness of 0.0014. Rev. B Page 2 of 4 C2 C2 12159-003 12159-002