6-Channel SD/ED/HD Video Filter with

Charge Pump

ADA4424-6

Rev. C

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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

LPF

LPF

LPF

LPF

LPF

CHARGE PUMP

POWER

MANAGEMENT

S

VSS_SD

VSS_HD

D/S

TERMINAL

CONTROL

HD_ENB

SD_ENB

+3.3V

+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

OFFSET_ENB

HY_IN

HPb_IN

HPr_IN

FC_SEL

SD_ENABLE

HD_ENABLE

HD_ENB

SD_ENB

×2

×2

×2

×1

×1

ADA4424-6

OFFSET

CANCELLATION

×1

VDD3_SD

VDD3_HD

VDD5

C1a

C1b C2/CP_OUT

VDD3_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.