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4 Board Layout
(a)ComponentSideSilkscreen
(b)BottomSideSilkscreen
Pin1
R8
R6
R4 R7
R5
R3
R2
R1
C4
C2
C3
C1
R16
R14
R13
R11
R10
R9
R15
R12
U1
-INB
J5
+INB
J4
+VSGND
P1
OUTA
J3
GND VS-
+INA
J1
-INA
J2
P2
OUTB
J6
DEM-OPA26xxE
BURR-BROWN
(5/97)REV.B
Board Layout
Table 2. Example Component Selection Guide
(1) (2)
CONFIGURATION NONINVERTING INVERTING DIFFERENCE
Gain +2 –1 +1
C
1
, C
2
0.1 µ F 0.1 µ F 0.1 µ F
C
3
, C
4
4.7 µ F 4.7 µ F 4.7 µ F
R
1
, R
9
49.9 Ω Not used 53.6 Ω
R
2
, R
10
20.0 Ω Not used 402 Ω
R
3
, R
11
Not used 20.0 Ω 402 Ω
R
4
, R
12
Not used 56.2 Ω 61.9 Ω
R
5
, R
13
Not used R
G
= 402 Ω R
G
= 402 Ω
R
6
, R
14
R
G
= 402 Ω Not used Not used
R
7
, R
15
R
F
= 402 Ω R
F
= 402 Ω R
F
= 402 Ω
R
8
, R
16
49.9 Ω 49.9 Ω 49.9 Ω
(1)
The values listed here are for illustration purposes only. See the
individual op amp data sheet for information on selecting these
values. See the specific data sheet to select proper values. The I/O
impedances are 50 Ω .
(2)
R
F
and R
G
refer to the feedback and gain-setting resistors for
current-feedback op amps.
This demonstration fixture is a two-layer PCB. (See Figure 3 .) It uses a ground plane on the bottom layer,
and signal and power traces on the top layer. 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.
(1) The board name shown in the silkscreen is DEM-OPA26xxE with the Burr-Brown Revision B design finalized
in May 1997.
Figure 3. DEM-OPA-MSOP-2A Demonstration Board Layout
SBOU004A – June 1997 – Revised May 2006 DEM-OPA-MSOP-2A Demonstration Fixture 3
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