DEM-OPA-SO-2A - Texas Instruments

+VS

OutB

-InB

+InB

OutA

-InA

+InA

-VS

R4A

R2A

R3A

R7A

OutA

J2A

GND

+VS

-VS

R1A

INA

J1A

R5A

R6A

R4B

R2B

R3B

R7B

OutB

R1B

INB

R5B R6B

J2B

J1B

User's Guide

SBOU003B–May 1998–Revised May 2010

DEM-OPA-SO-2A Demonstration Fixture

1 Description

The DEM-OPA-SO-2A demonstration fixture is a generic, unpopulated printed circuit board (PCB) for dual

high-speed operational amplifiers in SO-8 packages. Figure 1 shows the package pinout for this PCB. For

more information on these op amps, as well as good PCB layout techniques, see the individual amplifier

data sheets.

Figure 1. SO Package Pinout, Top View

2 Circuit

The circuit schematic in Figure 2 shows the connections for all possible components. Each configuration

uses only some of the components.

Figure 2. Schematic for DEM-OPA-SO-2A

All trademarks are the property of their respective owners.

SBOU003B–May 1998–Revised May 2010 DEM-OPA-SO-2A Demonstration Fixture

Components

www.ti.com

3 Components

Components that have RF performance similar to the ones listed in Table 1 may be substituted.

Table 1. Component Descriptions

PART DESCRIPTION

C1, C2Tantalum Chip Capacitor, SMD EIA Size 3528, 20V

C3– C5Multilayer Ceramic Chip Capacitor, SMD 1206, 50V

J1A – J2B SMA or SMB Board Jack (Amphenol 901-144-8)

L1, L2EMI-Suppression Ferrite Chip, SMD 1206 (Steward

LI 1206 B 900 R)

P1Terminal Block, 3.5mm Centers (On-Shore

Technology ED555/3DS)

R1A – R7B Metal Film Chip Resistor, SMD 1206, 1/8W

R1and R7set the I/O impedance; R2through R6set the gain; and C1through C5are supply bypass

capacitors. C3is optional; it adds a bypass between the supplies that improves distortion performance for

some models. L1and L2are ferrite chips that can reduce interactions with the power supply at high

frequencies. If not desired, they can be replaced with 0Ωresistors.

For single-supply operation, do not connect L2; otherwise, the –VSinput to P1would be at ground potential.

Standard Current-Feedback Op Amps—These op amps have the pinout illustrated in Figure 1.Table 2

lists typical values used for these parts. To select component values (especially R6) for a specific op amp ,

consult the respective data sheet.

Table 2. Standard Current-Feedback Op Amps(1)

SINGLE-

DUAL-SUPPLY DUAL-SUPPLY SUPPLY

COMPONENT (G = +2) (G = –1) (G = +1)

R149.9Ω57.6Ω49.9Ω

R210.0ΩOpen 10.0Ω

R3Open 10.0ΩOpen

R4Open 402ΩOpen

R5402ΩOpen Open

R6402Ω402Ω402Ω

R749.9Ω49.9Ω49.9Ω

C1, C22.2mF 2.2mF 2.2mF

C30.01mF 0.01mF Open

C4, C50.1mF 0.1mF 0.1mF

(1) The values and gains listed here will not work for all op amps. See

the specific data sheet to select proper values. The I/O impedances

are 50Ω.

2DEM-OPA-SO-2A Demonstration Fixture SBOU003B–May 1998–Revised May 2010

www.ti.com

Components

Standard Voltage-Feedback Op Amps—These op amps have the pinout shown in Figure 1.Table 3 lists

typical values used for these parts. To select component values for a specific op amp (especially R6),

consult the respective data sheet.

Table 3. Standard Voltage-Feedback Op Amps(1)

SINGLE-

DUAL-SUPPLY DUAL-SUPPLY SUPPLY

COMPONENT (G = +2) (G = –1) (G = +1)

R149.9Ω57.6Ω49.9Ω

R2178ΩOpen 0Ω

R3Open 210ΩOpen

R4Open 402ΩOpen

R5402ΩOpen Open

R6402Ω402Ω24.9Ω

R749.9Ω49.9Ω49.9Ω

C1, C22.2mF 2.2mF 2.2mF

C30.01mF 0.01mF Open

C4, C50.1mF 0.1mF 0.1mF

(1) The values and gains listed here will not work for all op amps. See

the specific data sheet to select proper values. The I/O impedances

are 50Ω.

Fixed Gain Amplifiers—For fixed gain amplifiers use internal resistors to set the gain at +1, +2 or –1.

Use the recommended values given in Table 2, except for the changes listed in Table 4.

Table 4. Fixed Gain Amplifiers Changes

SINGLE-

DUAL-SUPPLY DUAL-SUPPLY SUPPLY

COMPONENT (G = +2) (G = –1) (G = +1)

R4Open 0ΩOpen

R50ΩOpen Open

R6Open Open Open

SBOU003B–May 1998–Revised May 2010 DEM-OPA-SO-2A Demonstration Fixture

OUTB

J2B

INB

J1B

OUTA

J2A

INA

J1A

+VS GND VS-

GLUE AREA

DEM-OPA-SO-2A

REV. B

(MAY 2010)

R7A

R5A

R4A

R2A R7A R2B

R38

R4B

R5B

R6A

R1A R18

-VS GND +VS

R3A

L2 L1

R6B

Pin 1

R7B

OUTB

INB

OUTA

INA

(a) Component Side Silkscreen and Metal (b) Ground Plane Side Silkscreen and Metal (bottom view)

Board Layout

www.ti.com

4 Board Layout

This demonstration fixture is a two-layer PCB. (See Figure 3.) It uses both a ground plane and power

traces on the inner layers. The ground plane has been opened up around op amp pins that are sensitive

to capacitive loading. Power-supply traces are laid out to keep current loop areas to a minimum. The SMA

(or SMB) connectors may be mounted either vertically or horizontally onto the board edge. The location

and type of capacitors used for power-supply bypassing are crucial for high-frequency amplifiers. The

tantalum capacitors, C1and C2, do not need to be close to pins 8 and 4 on the PCB and may be shared

with other amplifiers. See the individual op amp data sheet for more information on proper board layout

techniques and component selection.

(1) The board name shown in the silkscreen for an earlier version of the fixture is DEM-OPA268xU with the

Burr-Brown Revision A design finalized in May 1998.

Figure 3. DEM-OPA-SO-2A Demonstration Board Layout

5 Measurement Tips

This demonstration fixture, with the component values shown, is designed to operate in a 50Ω

environment; most data sheet plots are obtained under these conditions. It is easy to change the

component values for different input and output impedance levels. However, do not use high-impedance

probes; they represent a heavy capacitive load to the op amp, and will alter the amplifier response.

Instead, use low-impedance (≤500Ω) probes with adequate bandwidth. The probe input capacitance and

resistance set an upper limit on the measurement bandwidth. If a high-impedance probe must be used,

place a 100Ωresistor on the probe tip to isolate its capacitance from the circuit.

4DEM-OPA-SO-2A Demonstration Fixture SBOU003B–May 1998–Revised May 2010

www.ti.com

REVISION HISTORY

Changes from A Revision (April, 2006) to B Revision ................................................................................................... Page

• Changed silkscreen image in Figure 3 ................................................................................................ 4

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

SBOU003B–May 1998–Revised May 2010 Revision History

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