AK4254 Datasheet, PDF (10/22 Pages) Asahi Kasei Microsystems – Capacitor-less Video Amp with 7:2 Video Switch

ASAHI KASEI
[AK4254]
OPERATION OVERVIEW
■ System Reset
In Serial Control Mode (P/S pin= “L”), it is recommended that AK4254 is powered up when the PDN pin= “L”. If the
AK4254 is powered up when the PDN pin = “H”, the AK4254 should be reset by the PDN pin = “L” after power up. The
control registers are initialized to their default values by resetting. In Parallel Control Mode, resetting by the PDN pin =
“L” is not needed when power up.
■ Parallel Control Mode (P/S pin = “H”)
The AK4524 is in Parallel Control Mode at P/S pin = “H”. When the AK4524 is in Parallel Control Mode, all registers
can not be accessed.
Mode
Power Down mode
Normal mode
PDN pin
L
H
H
SEL12-10 pin
x
“LLL”
Except for
“LLL”
CVEE1 pin
GND
GND
-CVDD1
Table 1. VOUT1 mode setting (Parallel Control Mode)
VOUT1 pin
GND
GND
Video signal
output
(x: Don’t Care)
Mode
Power Down mode
Normal mode
PDN pin
L
H
H
SEL22-20 pin
x
“LLL”
Except for
“LLL”
CVEE2 pin
GND
GND
-CVDD1
Table 2. VOUT2 mode setting (Parallel Control Mode)
VOUT2 pin
GND
GND
Video signal
output
(x: Don’t Care)
(a) Power Down mode (PDN pin= “L”)
The AK4524 is in Power Down mode at the PDN pin = “L”. When the AK4524 is in the Power Down mode, the
VOUT1-2 outputs are “GND”.
(b) Normal mode (PDN pin= “H”)
The AK4524 have 7:2 video switches. In Parallel Control Mode, the each input of VOUT1-2 is set by SEL12-10 pins and
SEL22-20 pins.
SEL12 pin SEL11 pin SEL10 pin
VOUT1 pin
L
L
L
Off Note: 13)
L
L
H
VIN1
L
H
L
VIN2
L
H
H
VIN3
H
L
L
VIN4
H
L
H
VIN5
H
H
L
VIN6
H
H
H
VIN7
Note: 13. When the input setting is “Off”, VOUT1 output is “GND”.
Table 3. Input Selector 1 (Parallel Control Mode)
MS0586-E-01
- 10 -
2007/08