ADA4424 Datasheet, PDF (1/16 Pages) Analog Devices – 6-Channel SD/ED/HD Video Filter with Charge Pump

6-Channel SD/ED/HD Video Filter with
Charge Pump
ADA4424-6
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
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.
FUNCTIONAL BLOCK DIAGRAM
+3.3V
+5V
VDD3_SD
VDD3_HD VDD5
D1
L1
L1_OUT
D2
D3
D/S
L2
TERMINAL
L2_OUT
HD_ENB
CONTROL
L3
L3_OUT
S
S1/S2
SD_ENB
S1/S2_OUT
Y_IN
C_IN
MODE0
MODE1
OFFSET_ENB
HY_IN
HPb_IN
HPr_IN
FC_SEL
SD_ENABLE
HD_ENABLE
×1
LPF
×2
×2
Y_OUT
CVBS_OUT
×1
×2
LPF
C_OUT
OFFSET
CANCELLATION
ADA4424-6
FC_SEL
×1
×2
LPF
FC_SEL
×1
×2
LPF
FC_SEL
×1
×2
LPF
SD_ENB HD_ENB
POWER
MANAGEMENT
CHARGE PUMP
HY_OUT
HPb_OUT
HPr_OUT
VSS_SD
VSS_HD
VDD3_CP C1a
C1b C2/CP_OUT
GND_CP
+3.3V C1
C2
Figure 1.
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.
Rev. C
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