AD8330 Evaluation Board EVAL-AD8330EB GENERAL DESCRIPTION BASIC OPERATION The EVAL-AD8330EB is an easy-to-use accessory that enables a hands-on evaluation of the AD8330 variable gain amplifier (VGA). It includes test pins for connections to all of the functional device inputs. Figure 1 is a full size photograph of the board. The input SMA connector IN is terminated with a 49.9 Ω resistor (see Figure 2). For convenience, the board includes an AD8131 high speed differential amplifier to convert a singleended signal source to the differential input of the AD8330. If desired, the AD8131 can be removed and the AD8330 can be driven at one of its inputs from a single-ended source. The AD8330 output is observed at the SMA connectors OUT_HI and OUT_LO or by using the 2-pin header OUT_HI/ OUT_LO adjacent to the device. 03721-009 The AD8330 requires only a +5 V power supply; however, because of the AD8131 buffer bipolar power supply requirements, ±5 V supplies are required to power the board. The current required for the board is approximately 40 mA from the +5 V supply and 10 mA from the −5 V supply. OPTIONS Table 1 lists the jumpers on the board and their functions. Consult the AD8330 data sheet for further explanation of their functions. W1 FLTR W2 OFST +5V AGND 1 ENB R1 0Ω +5V 2 C1 + 10μF 10V R5 49.9Ω C18 0.1μF 3 C20 0.1μF –5V C17 + 10μF 10V VPOS ENBL 6 VPSO 4 4 IN_HI/LO 5 C16 0.01μF VDBS AGND 6 C6 0.1μF INHI OPHI C19 0.1μF 14 +5V 13 7 CMGN1 8 C4 0.1μF OUT_HI C9 12pF OUT_HI/LO INLO W3 UP W4 DOWN 15 AD8330 5 +5V +5V C12 0.1μF C11 0.1μF C3 0.1μF C5 0.1μF 16 VPSI C2 0.1μF C14 0.01μF AD8131 8 3 2 1 R13 24.9Ω OFST R12 1kΩ CNTR C15 0.1μF IN VCMD AGND C13 1nF 12 MODE OPLO VDBS CMOP 11 CMGN COMM VMAG C8 12pF OUT_LO 10 9 C10 0.1μF VMAG C7 0.1μF AGND 03721-001 Figure 1. Photograph of the AD8330 Evaluation Board Figure 2. Schematic Diagram Rev. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2006 Analog Devices, Inc. All rights reserved. EVAL-AD8330EB Table 1. Functions of Jumpers W3 W4 The basic board connections for a typical measurement are shown in Figure 3. To minimize circuit-loading effects, a low capacitance FET probe is recommended for observing input or output waveforms. Dual circuit headers IN_HI/LO and OUT_HI/OUT_LO are provided for this purpose. The SMA connectors OUT_HI and OUT_LO can also be used, but the user may need to account for load capacitance effects. EVAL-AD8330EB BOARD DESIGN The EVAL-AD8330EB is a 4-layer design for maximum groundplane area. The evaluation board side silkscreen and wiring patterns are shown in Figure 4 through Figure 9. NETWORK ANALYZER PROBE POWER SUPPLY POWER SUPPLY DIFFERENTIAL PROBE +5V GND SIGNAL INPUT GND PRECISION VOLTAGE REFERENCES (FOR VDBS, VMAG) 03721-002 W2 MEASUREMENT SETUP Function Connects a high-pass filter to the offset control loop pin. This jumper is normally not installed. Disables the offset correction loop. This jumper is installed for dc or low frequency operation. Mode up. Install for ascending gain with increasing VDBS gain control voltage. Mode down. Install for descending gain with increasing VDBS gain control voltage. 03721-003 Name W1 Figure 3. Typical Connections Rev. B | Page 2 of 4 03721-006 03721-003 EVAL-AD8330EB Figure 4. Component-Side Silkscreen 03721-007 03721-004 Figure 7. Wiring-Side Silkscreen Figure 5. Component-Side Wiring 03721-008 03721-005 Figure 8. Wiring-Side Pattern Figure 6. Inner Layer 1 Figure 9. Inner Layer 2 Rev. B | Page 3 of 4 EVAL-AD8330EB Table 2. AD8330 Parts List Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Quantity 1 1 1 1 11 2 2 2 2 1 7 3 1 1 3 10 Description Resistor SM, 49.9 Ω, 1%, 1/16 W, 0603 Resistor SM, 24.9 Ω, 1%, 1/8 W, 1206 Resistor SM, 0 Ω, 5%, 1/8 W, 1206 Resistor SM, 1 kΩ, 1%, 1/8 W, 1206 Capacitor SM, 0.1 μF, 50 V, 1206 Capacitor SM, 0.1 μF, 16 V, 0603 Capacitor SM tantalum, 10 μF, 10 V, A Capacitor SM, 10 nF, 50 V, 1206 Capacitor SM, 12 pF, 5%, NPO, 0603 Capacitor SM, 1 nF, 50 V, 5%, 1206 Header, 2 pin Shunt IC, VGA, AD8330ARQ IC, differential amplifier, AD8131AR Connector, SMA fem end launch Test point 17 18 19 1 4 4 Board, PC, A00471C Standoff aluminum round 4 to 40 × 1/2" Pan head screw 4 to 40 × 1/4" Reference Designator R5 R13 R1 R12 C2, C4, C6, C7, C10, C11, C12, C15, C18, C19, C20 C3, C5 C1, C17 C14, C16 C8, C9 C13 CMGN1, IN_HI/LO, OUT_HI/ OUT_LO, W1, W2, W3, W4 CMGN1, W2, W3 DUT A1 In, out high, out low +5V, –5V, AGND1, AGND2, AGND3, 1GND4, ENBL, VCMD, VDBS, VMAG ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. ORDERING GUIDE Model AD8330-EVAL Description Evaluation Board ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C03721-0-3/06(B) T T Rev. B | Page 4 of 4