[AK4254]
AK4254
Capacitor-less Video Amp with 7:2 Video Switch
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
•
Parallel I/F or Serial µP I/F (I
2
C, 3-wires serial)
2. Power Supply: 2.7V ~ 3.6V
3. Ta=-40
∼
+85°C
4. Package: 30pin VSOP
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
VIN1
VIN2
VIN3
VIN4
VIN5
VIN6
VIN7
SW1
LPF
+6dB
VOUT1
Sync-tip
Clamp
AVDD
AVSS
LPF
TEST
+6dB
VOUT2
SW2
PDN
P/S
I2C/SEL22
CDTI/SDA/SEL21
CCLK/SCL/SEL20
CSN/SEL12
CAD1/SEL11
CAD0/SEL10
Control
I/F
Charge
Pump
Charge
Pump
Clock
Generator
Clock
Generator
CVDD2 CP2 CN2
CVEE2 CVSS2
1uF
CVSS1
CVEE1
1uF
CP1
CN1 CVDD1
1uF
1uF
Figure 1. Block Diagram
MS0586-E-01
-1-
2007/08
AKM [ ASAHI KASEI MICROSYSTEMS ]
