Analog Devices AD8330 User manual

AD8330 Evaluation Board

EVAL-AD8330EB

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

GENERAL DESCRIPTION

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.

03721-009

Figure 1. Photograph of the AD8330 Evaluation Board

BASIC OPERATION

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 single-

ended 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.

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.

DOWN

0.1μF

INLO

MODE

VPSI

INHI

VPSO

CMOP

OPLO

CNTR

OFST

OPHI

ENBL

VPOS

+5V

COMM

VMAG

VDBS

CMGN

0.1μF

+5V

0.1μF

+5V

0.1μF

CMGN1

VDBS

VMAG

C10

0.1μF

+5V

C14

0.01μF

C15

0.1μF

CMD

ENB

AD8131

C16

0.01μF

–5V AGND

AGND

C12

0.1μF

0Ω

49.9Ω

R13

24.9Ω

OUT_HI

OUT_LO

FLTR R12

1kΩ

OUT_HI/LO

IN_HI/LO

AD8330

C13

1nF

10μF

10V

OFST

C19

0.1μF

C11

0.1μF

12pF

C18

0.1μF

C20

0.1μF

C17

10μF

10V

0.1μF

03721-001

Figure 2. Schematic Diagram

EVAL-AD8330EB

Rev. B | Page 2 of 4

Table 1. Functions of Jumpers

Name Function

W1 Connects a high-pass filter to the offset control loop

pin. This jumper is normally not installed.

W2 Disables the offset correction loop. This jumper is

installed for dc or low frequency operation.

W3 Mode up. Install for ascending gain with increasing

VDBS gain control voltage.

W4 Mode down. Install for descending gain with increasing

VDBS gain control voltage.

MEASUREMENT SETUP

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 ground-

plane area. The evaluation board side silkscreen and wiring

patterns are shown in Figure 4 through Figure 9.

POWER SUPPLY

PRECISION VOLTAGE

REFERENCES

(FOR VDBS, VMAG)

NETWORK ANALYZER

DIFFERENTIAL

PROBE

GND

+5V

GND

SIGNAL

INPUT

03721-002

PROBE

POWER SUPPLY

03721-003

Figure 3. Typical Connections

EVAL-AD8330EB

Rev. B | Page 3 of 4

03721-003

Figure 4. Component-Side Silkscreen

03721-004

Figure 5. Component-Side Wiring

03721-005

Figure 6. Inner Layer 1

03721-006

Figure 7. Wiring-Side Silkscreen

03721-007

Figure 8. Wiring-Side Pattern

03721-008

Figure 9. Inner Layer 2

EVAL-AD8330EB

Rev. B | Page 4 of 4

Table 2. AD8330 Parts List

Pin No. Quantity Description Reference Designator

1 1 Resistor SM, 49.9 Ω, 1%, 1/16 W, 0603 R5

2 1 Resistor SM, 24.9 Ω, 1%, 1/8 W, 1206 R13

3 1 Resistor SM, 0 Ω, 5%, 1/8 W, 1206 R1

4 1 Resistor SM, 1 kΩ, 1%, 1/8 W, 1206 R12

5 11 Capacitor SM, 0.1 μF, 50 V, 1206 C2, C4, C6, C7, C10, C11, C12, C15, C18, C19, C20

6 2 Capacitor SM, 0.1 μF, 16 V, 0603 C3, C5

7 2 Capacitor SM tantalum, 10 μF, 10 V, A C1, C17

8 2 Capacitor SM, 10 nF, 50 V, 1206 C14, C16

9 2 Capacitor SM, 12 pF, 5%, NPO, 0603 C8, C9

10 1 Capacitor SM, 1 nF, 50 V, 5%, 1206 C13

11 7 Header, 2 pin CMGN1, IN_HI/LO, OUT_HI/ OUT_LO, W1, W2, W3, W4

12 3 Shunt CMGN1, W2, W3

13 1 IC, VGA, AD8330ARQ DUT

14 1 IC, differential amplifier, AD8131AR A1

15 3 Connector, SMA fem end launch In, out high, out low

16 10 Test point +5V, –5V, AGND1, AGND2, AGND3, 1GND4, ENBL,

VCMD, VDBS, VMAG

17 1 Board, PC, A00471C

18 4 Standoff aluminum round 4 to 40 × 1/2"

19 4 Pan head screw 4 to 40 × 1/4"

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 Description

AD8330-EVAL Evaluation Board

registered trademarks are the property of their respective owners.

C03721-0-3/06(B)

T TTT

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