Ultralow Power SD Video Filter

with Load Detection

ADA4431-1

Rev. 0

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FEATURES

Third-order, low-pass video filter

1 dB flatness out to 6 MHz

27 dB rejection at 27 MHz

Low quiescent current: 4.7 mA typical

Low power-down current: 24 μA typical

Load detection capability

SAG correction

Allows use of smaller capacitors in ac-coupled outputs

Low supply voltage: 2.5 V to 3.6 V

Charge pump

Creates a negative voltage from single positive supply

Allows capless output coupling with no dc offset

Rail-to-rail output

High input-to-output isolation in disabled state

89 dB @ 1 MHz

Small package

3 mm × 3 mm LFCSP

Low 0.55 mm package height

Wide operating temperature range: −40°C to +85°C

APPLICATIONS

Portable media players

Portable gaming consoles

Cell phones

Digital still cameras

Portable DVD players

Portable video cameras

PIN CONFIGURATION

1

2

3

GND

SUBS

4

CAP1

12

10

9

DIS

11

IN

LDO

LOAD

DETECT

LPF

G = 2

CHARGE PUMP

Figure 1.

LPF

x1

x2

OUT

IN

75Ω

4

3

2

7

56

8

9 11

12

VIDEO

DAC/

ENCODER

SYSTEM

CONTROLLER

LDO

DIS

GND

CAP4 CAP3

0.1µF

CAP2 CAP1

0.1µF

SUBS GND

1.0µF

SAG

FB1

FB2

14

15

16

13

VIDEO

OUT

0.1µF

0.1µF

ADA4431-1

110

Figure 2. Typical Application Circuit

GENERAL DESCRIPTION

The ADA4431-1 is a fully integrated video reconstruction filter

that combines excellent video specifications with low power

consumption, making it ideal for portable video filtering

applications. The ADA4431-1 is able to detect whether a video

load is present at the output, powering down the device when

the load is disconnected.

The ADA4431-1 operates on single supplies as low as 2.5 V

while providing the dynamic range required by the most

demanding video systems. The on-board charge pump

provides a virtual negative supply, allowing the video signal to

be dc-coupled and the black level to be set to ground, while the

sync passes cleanly at 300 mV below ground.

When operating with the charge pump off, the ADA4431-1

provides a dc offset to keep the sync tip approximately 100 mV

above ground. In addition, the part features SAG correction,

which permits the use of smaller capacitors in applications with

ac-coupled outputs.

The ADA4431-1 is packaged in a low profile 16-lead LFCSP and

operates in the industrial temperature range of −40°C to +85°C.