MAX7462UUA+T Maxim Integrated Products, MAX7462UUA+T Datasheet - Page 5

• Manufacturer Part Number: MAX7462UUA+T
• Description: IC FILTER BUFFER VID 8-MSOP
• Manufacturer: Maxim Integrated Products
• Type: Video Filterr

Specifications of MAX7462UUA+T

• Applications: Recorders, Set-Top Boxes
• Mounting Type: Surface Mount
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX7462/MAX7463 filters and buffers the analog
CVBS video outputs of DAC video-encoders in applica-
tions such as set-top boxes, hard-disk recorders, DVD
players, and digital VCRs. The MAX7462/MAX7463 con-
sist of a lowpass filter and an output video buffer that can
drive two standard 150
operate from a single +5V supply and have a bandwidth
optimized for interlaced NTSC, PAL, and SDTV.
The reconstruction filter is a 4th-order Butterworth-type
response that features a maximally flat passband for
NTSC and PAL bandwidths. The stopband attenuation
is optimized for a video-encoder DAC sampling fre-
quency of 27MHz (see the Typical Operating
Characteristics).
The output buffer can drive two 150
a 2V
is selectable between +6dB and +9.5dB by using GAIN
(see
The MAX7462/MAX7463 can drive an AC load or drive
the video load directly without using a large output
Table 1. Gain Setting Control (MAX7462)
MAX7462
3, 4, 5
—
P-P
1
2
6
7
8
Table 1). The MAX7463 has a fixed gain of +6dB.
GAIN
GND
V
signal. For the MAX7462, the output buffer gain
CC
Single-Channel Video Reconstruction Filters
PIN
MAX7463
2, 4, 5, 6
—
—
1
3
7
8
_______________________________________________________________________________________
DISABLE
Detailed Description
NAME
GAIN
GND
N.C.
OUT
V
IN
CC
video loads. These devices
BUFFER GAIN (dB)
Video Input. AC-couple IN with a series 0.1µF capacitor.
Gain Control Input. Connect GAIN to GND for a gain of +6dB (+2V/V). Connect GAIN to V
for a gain of +9.5dB (+3V/V).
Ground
No Connection. Not internally connected. Connect to GND for better performance.
Disable Input. Connect to V
to put the output buffer in a high-impedance state.
+5V Supply Input
Buffer Output. This output can be either AC- or DC-coupled. Use at minimum a 220µF
capacitor for AC-coupled loads.
+9.5
+6
Output Buffer
video loads with
Filter
CC
to enable the output buffer (normal operation). Connect to GND
capacitor. The output buffer can drive DC loads while
maintaining an output blanking level of less than 1V. The
blanking level allows the MAX7462/MAX7463 to meet the
digital TV interface specifications for DC coupling.
Use a 0.1µF ceramic capacitor to AC-couple the input.
The input capacitor stores a DC voltage so that the out-
put is clamped to the appropriate DC voltage level.
The outputs are typically connected to a 75
back-match resistor followed by the video cable.
Because of the inherent divide-by-two of this configura-
tion, the blanking level on the video cable is always
less than 1V, complying with industry-standard video
requirements such as the digital TV standard (which
allows up to 1VDC on the video cable) and the
European SCART standard (which allows up to 2VDC
on the video cable). The video buffer can also drive an
AC-coupled video load. Good video performance is
achieved with an output capacitor as low as 220µF.
The MAX7462/MAX7463 operate from a single +5V
supply. Bypass V
addition, it is sometimes advantageous to connect a
10µF capacitor within the general vicinity of the video
circuitry. Place all other external components as close
to the device as possible.
FUNCTION
Power-Supply Bypassing and Layout
Applications Information
CC
to GND with a 0.1µF capacitor. In
Output Considerations
and Buffers
Input Considerations
Pin Description
CC
series
5