Texas Instruments DEM-OPA-SSOP-3E Evaluation Module DEM-OPA-SSOP-3E DEM-OPA-SSOP-3E Ficha De Dados
Códigos do produto
DEM-OPA-SSOP-3E
4
Board Layout
DEM-OPA-SSOP-3E
Rev. 2 - 01/09
Rev. 2 - 01/09
PR1375
G0
B0
R0
R1
G1
B1
SEL
EN
OUT_R
OUT_B
OUT_G
-V
S
+V
S
TB1
L2
C2
C1
R11
L1
C5
R7
R8
R9
R8
R9
R10
R6
R1
R3
R2
R5
R4
U1
(b) Bottom layer
(a) Top layer
www.ti.com
Board Layout
R
1
through R
9
set the I/O impedance for the signal chain, R
10
and R
11
set the input impedance for the
select and enable pins, and C
1
, C
2
, C
3
, C
4
, and C
5
are supply bypass capacitors. C
5
is optional; it adds a
bypass between the supplies that improves distortion performance for some models. L
1
and L
2
are ferrite
chips that can reduce interactions with the power supply at high frequencies. If not desired, they can be
replaced with 0
replaced with 0
Ω
resistors.
For single-supply operation, do not connect L
2
; otherwise, the –V
S
input to TB
1
would be at ground
potential.
This demonstration fixture is a two-layer PCB. (See
.) It uses a ground plane on the bottom, and
signal and power traces on the top. The ground plane has been opened up around op amp pins 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.
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.
The location and type of capacitors used for power-supply bypassing are crucial to high-frequency
amplifiers. The tantalum capacitors, C
amplifiers. The tantalum capacitors, C
1
and C
2
, do not need to be as close to pins 11 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.
component selection.
Figure 3. DEM-OPA-SSOP-3E Demonstration Fixture Layout
SBOU043B – February 2007 – Revised April 2009
DEM-OPA-SSOP-3E Demonstration Fixture
3