[AK4254]

MS0586-E-01

2007/08

- 1 -

GENERAL DESCRIPTION

The AK4254 is a 2ch Video AMP with 7:2 video switch, input clamp circuit, LPF and charge pump circuit.

The integrated charge pump circuit can generate the negative power supply and remove the output

coupling capacitor. The AK4254 suits Car Navigation system. The AK4254 is offered in a space saving

30pin VSOP package.

FEATURES

1. Video Section

• Composite Signal Inputs/Output

• Selector for 7 inputs and 2 outputs

• Video Driver for Composite Signal Output (+6dB)

• On-Chip Sync-tip Clamp Circuit

• 6MHz Low Pass Filter

• Charge pump circuit for negative power supply

2. Power Supply: 2.7V ~ 3.6V

3. Ta=-40

∼ +85°C

4. Package: 30pin VSOP

1uF

1uF

PDN

P/S

I2C/SEL22

CDTI/SDA/SEL21

CCLK/SCL/SEL20

CSN/SEL12

CAD1/SEL11

CAD0/SEL10

VIN1

VIN2

VIN3

VIN4

VIN5

VIN6

VIN7

+6dB

Control

I/F

SW1

SW2

0.1uF

0.1uF

0.1uF

0.1uF

0.1uF

0.1uF

VOUT1

VOUT2

Charge

Pump

Clock

Generator

CP2

CN2

CVEE2 CVSS2

+6dB

0.1uF

Clock

Generator

Charge

Pump

CP1

AVDD

AVSS

TEST

CVDD2

1uF

1uF

Sync-tip

Clamp

LPF

LPF

CVSS1

CVEE1

CN1 CVDD1

Figure 1. Block Diagram

Capacitor-less Video Amp with 7:2 Video Switch

AK4254