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PDF MAX9505 Data sheet ( Hoja de datos )
| Número de pieza | MAX9505 | |
| Descripción | DirectDrive Video Amplifier | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX9505 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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19-3675; Rev 0; 5/05
DirectDrive Video Amplifier with
Reconstruction Filter and Analog Switch
www.datasheet4u.com
General Description
The MAX9505 filters and amplifies standard-definition
video signals. Maxim’s DirectDrive™ technology elimi-
nates large output-coupling capacitors and sets the
video black level to ground. An internal reconstruction
filter smoothes the steps and reduces the spikes on the
video signal from the video digital-to-analog converter
(DAC). The input of the MAX9505 can be directly con-
nected to the output of a DAC. The MAX9505 provides
a compact, integrated, and low-power solution.
The reconstruction filter typically has 3dB attenuation at
9MHz and 50dB attenuation at 27MHz, and ±1dB pass-
band flatness to 5.5MHz.
Maxim’s DirectDrive uses an integrated charge pump
and a linear regulator to create a negative power supply
to drive the sync below ground. The charge pump injects
so little noise into the video output that the picture is visi-
bly flawless.
The MAX9505 features an internal 1.7Ω analog switch
that interfaces with a 4-pole multimedia jack. This
switch allows one of the poles to be set as a video
input, a video output, or a microphone input.
The MAX9505 is offered in space-saving 16-pin QSOP
and 16-pin TQFN packages and is specified over the
-40°C to +85°C extended temperature range.
Applications
Mobile Phones/Smartphones
Space-Constrained, Low-Power Audio/Video
Portable Devices
Features
♦ DC-Coupled Output
♦ Direct Connection to Video DAC
♦ Video Output Black Level Set to Ground
♦ Video Reconstruction Filter with 50dB
Attenuation at 27MHz
♦ 6dB Gain
♦ 1.7Ω RON Analog Switch
♦ 10nA Shutdown Supply Current
♦ 2.7V to 3.6V Single-Supply Operation
Ordering Information
PART*
PIN-
PACKAGE
PKG CODE TOP MARK
MAX9505EEE 16 QSOP
E16-4
—
MAX9505ETE 16 TQFN
T1633-4
ACW
*All devices are specified over the -40°C to +85°C operating
temperature range.
Functional Diagram/Typical Operating Circuit and Pin
Configurations appear at end of data sheet.
Block Diagram
0 TO 50mV
0V
SOUT
VIDIN
MAX9505
BUFFER
LOWPASS
FILTER
6dB
AMP
SIN
0V
VIDOUT
LINEAR
REGULATOR
CHARGE
PUMP
-0.1V TO
+0.1V
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
DirectDrive Video Amplifier with
Reconstruction Filter and Analog Switch
www.datasheet4u.com
Timing Diagrams
VNO SOUT
LOGIC
INPUT
MODE0
SGND
VDD
VDD
SIN
RL
VOUT
CL
CL INCLUDES FIXTURE AND STRAY CAPACITANCE.
VOUT = VNO (RL / (RL + RON))
VIH
MODE0
VIL
50%
SWITCH OUTPUT
0V
VOUT 0.9 x VOUT
tON
tR < 5ns
tF < 5ns
tOFF
0.9 x VOUT
Figure 1. Analog Switch Turn-On/Off Time
VGEN
RGEN
SOUT
SGND
VDD
VDD
SIN
MODE0
IN
VIL TO VIH
VOUT
CL
VOUT
OFF
IN
∆VOUT
ON
Q = (∆VOUT) (CL)
OFF
Figure 2. Charge Injection
_______________________________________________________________________________________ 5
5 Page 
DirectDrive Video Amplifier with
Reconstruction Filter and Analog Switch
www.daTtasahbeelet4u1.c.omOperating Modes
OPERATING MODE
Shutdown Mode
Extended Range Switch
Mode
Video Output Mode
Normal Switch Mode
MODE1
0
0
1
1
MODE0
0
1
0
1
VIDEO
CIRCUIT
Off
Off
On
Off
CHARGE
PUMP
Off
On
On
Off
ANALOG
SWITCH
Open
Closed
Open
Closed
COMMENTS
Video output is 4kΩ and analog
switch is open
Video output is high impedance.
Analog switch range is from -2V
to VDD.
Video output is in normal operation.
Analog switch is open.
Video output is high impedance.
Analog switch range is from SGND
to VDD.
Short-Circuit Protection
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.
Shutdown
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.
Applications Information
Power-Supply Bypassing and Ground
Management
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 (VDD) with a 1µF
capacitor to SGND, placed as close to the device as
possible. Bypass the charge-pump supply (CPVDD)
with a 1µF capacitor to CPGND, placed as close to the
device as possible. Connect CPVSS to VSS and bypass
with a 1µF capacitor to CPGND as close to the device
as possible.
______________________________________________________________________________________ 11
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| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX9505.PDF ] | |
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