MAX9505 Maxim Integrated Products, MAX9505 Datasheet - Page 11

• Manufacturer Part Number: MAX9505
• Description: DirectDrive Video Amplifier
• Manufacturer: Maxim Integrated Products

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The MAX9505 typical operating circuit includes a 75Ω
back-termination resistor that limits short-circuit current if
an external short is applied to the video output. The
MAX9505 features internal output, short-circuit protection
to prevent device damage in prototyping and applica-
tions where the amplifier output can be directly shorted.
The MAX9505 features a low-power shutdown mode for
battery-powered/portable applications. Shutdown
reduces the quiescent current to less than 10nA. Setting
MODE1 and MODE0 low disables the outputs and
places the MAX9505 into a low-power shutdown mode.
In shutdown mode the amplifier, charge pump, and lin-
ear regulator are turned off and the video output resis-
tance is 4kΩ.
Table 1. Operating Modes
Shutdown Mode
Extended Range Switch
Mode
Video Output Mode
Normal Switch Mode
OPERATING MODE
Reconstruction Filter and Analog Switch
______________________________________________________________________________________
Short-Circuit Protection
MODE1
0
0
1
1
DirectDrive Video Amplifier with
MODE0
0
1
0
1
Shutdown
CIRCUIT
VIDEO
Off
Off
On
Off
The MAX9505 operates from a 2.7V to 3.6V single sup-
ply and requires proper layout and bypassing. For the
best performance, place the components as close to
the device as possible.
Proper grounding improves performance and prevents
any switching noise from coupling into the video signal.
Connect GND and SGND together at a single point on
the PC board. Route all traces that carry switching tran-
sients away from SGND. Return SGND to the lowest
impedance ground available. Route CPGND and all
traces carrying switching transients away from SGND,
GND, and other traces and components in the video
signal path. Bypass the analog supply (V
capacitor to SGND, placed as close to the device as
possible. Bypass the charge-pump supply (CPV
with a 1µF capacitor to CPGND, placed as close to the
device as possible. Connect CPV
with a 1µF capacitor to CPGND as close to the device
as possible.
CHARGE
PUMP
Off
On
On
Off
Power-Supply Bypassing and Ground
ANALOG
SWITCH
Closed
Closed
Open
Open
Applications Information
Video output is 4kΩ and analog
switch is open
Video output is high impedance.
Analog switch range is from -2V
to V
Video output is in normal operation.
Analog switch is open.
Video output is high impedance.
Analog switch range is from SGND
to V
DD
DD
.
.
COMMENTS
SS
to V
Management
SS
DD
and bypass
) with a 1µF
DD
11
)