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PDF FMS6151 Data sheet ( Hoja de datos )
| Número de pieza | FMS6151 | |
| Descripción | Ultra Portable Video Filter Driver | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de FMS6151 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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www.DataSheet4U.com
January 2006
FMS6151
Ultra Portable Video Filter Driver
Features
■ 5th order 8MHz (SD) filter
■ Power down to 25nA
■ DC coupled input
■ AC or DC coupled output
■ DC coupled output eliminate need for AC coupling cap
■ SAG correction reduces size of AC coupling cap
■ Fixed gain of 6dB
■ Small, lead (Pb) free, Micropak® packaging
Applications
■ Digital Still Cameras
■ Camera Phones
■ Personal Digital Assistants
■ Set Top Boxes
■ Digital Video Recorders
Description
The FMS6151 low cost, integrated, video filter is intended to
replace passive LC filters and drivers in low voltage portable
video applications. The 5th order filter provides better image
quality compared to typical 2nd and 3rd order passive solutions.
The FMS6151 is intended to be directly driven by a DC-coupled
DAC output. The output can drive an AC or DC-coupled doubly
terminated coax(150Ω) load. DC-coupling the output removes
the need for an expensive output coupling capacitor. If an AC-cou-
pled output is needed, the SAG correction circuit can be used to
reduce the AC output coupling capacitor value. Input DC levels
are offset by approximately 100mV. This internal level shift is
incorporated to prevent sync pulse clipping.
Offering SAG correction, fixed gain of 6dB, and a 5th order low
pass filter in a tiny space saving package (Micropak) makes the
FMS6151 well suited for space sensitive applications such as
cellular phones and digital cameras.
Block Diagram
Vcc = 2.5V to 5.25V
EN
VIN +
8MHz,
5th order
-
VOUT
SAG
FMS6151 Rev. 1B
1 www.fairchildsemi.com
1 page  
Typical Performance Characteristics
Tc = 25˚C, Vcc = 2.7V, Rs = 37.5Ω, AC coupled output into 150Ω load, SAG pin connected to VOUT pin;
unless otherwise noted.
Figure 7. Supply Current vs. Temp.
4.0
3.9
3.8
3.7
3.6
3.5
-40 -20 0 20 40 60
Temperature (°C)
80
Figure 8. Shutdown Current vs. Temp.
60
50
40
30
20
10
0
-40
-20
0 20 40 60
Temperature (°C)
80
Application Information
Input Voltage
The FMS6151 is intended to be directly driven by a DC coupled
DAC output. The input common mode range of the FMS6151 is
1.2Vpp, ground referenced.
Enable/Shutdown
The FMS6151 has a shutdown feature that disables the output
and reduces the quiescent current to ~25nA. This feature is
especially useful in portable applications, such as cellular
phones, hand held gaming devices, and video cameras requiring
video filtering and drive capability.
Internal Level Shift
The FMS6151 has an internal level shift circuit to avoid sync tip
clipping. The output signal is shifted 200mV toward the VCC rail
to help prevent clipping. This offset is extremely useful when DC
coupled out or using SAG correction.
SAG Correction
Sag correction provides excellent performance with a small output
coupling capacitor. It eliminates the 220µF - 1000µF output cou-
pling capacitors traditionally used. The traditional output circuit
(220µF into 150Ω load) creates a single pole (-3dB) at 5Hz.
Reducing this capacitor causes excessive phase shift, resulting
in video field tilt which can prevent proper recovery of the syn-
chronization signals.
The FMS6151 sag correction circuit provides a small amount of
peaking, which provides compensation of the phase response,
significantly reducing video field tilt. The SAG correction circuit
allows you to decrease the large, 220µF, output coupling capacitor.
A 22µF is used for sag correction and a 47µF is used for the out-
put coupling capacitor, extremely smaller and cheaper than the
traditional circuit requirements.
Output Configuration
The FMS6151 output is a low impedance voltage driver. It is
capable of driving an AC or DC coupled single load.
For more application information, please refer to our FMS6151
Application Note, AN-8005.
FMS6151 Rev. 1B
5 www.fairchildsemi.com
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet FMS6151.PDF ] | |
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