6-Channel SD/ED/HD Video Filter with
Charge Pump
ADA4424-6
Rev. C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2009-2010 Analog Devices, Inc. All rights reserved.
FEATURES
3 SD channels; 18 MHz typical 1 dB bandwidth (BW)
3 ED/HD channels; 25 MHz or 34 MHz typical 1 dB BW
Fixed gain of 6.2 dB (2.042 V/V)
On-board negative supply for output coupling without
capacitors
Minimal dc offset at the output pins
Internal summation of Y and C channels for CVBS output
Flexible input dc offset cancellation for luma channels
D-terminal (EIAJ RC-5237 D5) and S-terminal (S1/S2) support
Capable of driving 2 back-terminated 75 Ω video loads
simultaneously
Separate power-down pins for SD and ED/HD sections
38-lead TSSOP package
Sony Green Partner Environmental Quality Approval
Program compliant
APPLICATIONS
DVD players and recorders
Set-top boxes
Projectors
Personal video recorders
FUNCTIONAL BLOCK DIAGRAM
08550-001
LPF
LPF
LPF
LPF
LPF
CHARGE PUMP
POWER
MANAGEMENT
S
VSS_SD
VSS_HD
D/S
TERMINAL
CONTROL
HD_ENB
SD_ENB
+3.3
+5V
L1
L2
L3
S1/S2
L1_OUT
L2_OUT
L3_OUT
S1/S2_OUT
Y_OUT
CVBS_OUT
C_OUT
HY_OUT
HPb_OUT
HPr_OUT
×2
×2
×2
×1
×1
C2
C1
+3.3V
D1
D2
D3
Y_IN
C_IN
MODE0
MODE1
FFSET_ENB
HY_IN
HPb_IN
HPr_IN
FC_SEL
SD_ENABLE
HD_ENABLE
HD_ENBSD_ENB
×2
×2
×2
×1
×1
ADA4424-6
OFFSET
CANCELLATION
×1
VDD3_SD VDD3_HD VDD5
C1a
C1b C2/CP_OUTVDD3_CP GND_CP
FC_SEL
FC_SEL
FC_SEL
Figure 1.
GENERAL DESCRIPTION
The ADA4424-6 is a high performance video reconstruction filter
specifically designed for consumer applications. It consists of a
standard definition (SD) section with two fifth-order Butterworth
filters and a high definition (HD) section with three fifth-order
filters. The SD section contains an internal Y/C summer for CVBS
output, whereas the HD section provides selectable corner
frequencies for either extended definition (ED) or HD signals.
The ADA4424-6 filter/buffer section operates from a single 3.3 V
supply. Full support for D-terminal (EIAJ RC-5237 D5) and S1/S2
signaling is provided, along with a dedicated 5 V supply pin.
Separate enable pins are provided for the SD and HD sections.
The luma channels (Y_IN, HY_IN) of the ADA4424-6 are
capable of detecting and cancelling dc input offsets of up to
1.1 V. Four distinct modes of detection/cancellation are
available.
The output drivers on the ADA4424-6 feature rail-to-rail outputs
with 6.2 dB gain. An on-board charge pump allows the outputs to
swing up to 1.4 V below ground, eliminating the need for large
coupling capacitors. Each output is capable of driving two 75 Ω
doubly terminated cables.
The ADA4424-6 is available in a 38-lead TSSOP and operates in
the industrial temperature range of −40°C to +85°C.