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PDF AK4254 Data sheet ( Hoja de datos )
| Número de pieza | AK4254 | |
| Descripción | Capacitor-less Video Amp | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AK4254 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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[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.
www.DataSheet4U.com
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 (I2C, 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
AVDD
AVSS
TEST
PDN
P/S
I2C/SEL22
CDTI/SDA/SEL21
CCLK/SCL/SEL20
CSN/SEL12
CAD1/SEL11
CAD0/SEL10
Control
I/F
SW1
LPF +6dB
SW2
Sync-tip
Clamp
LPF
+6dB
Clock
Generator
Charge
Pump
Clock
Generator
Charge
Pump
VOUT1
VOUT2
CVDD2 CP2 CN2
1uF
CVEE2 CVSS2
1uF
CVSS1
Figure 1. Block Diagram
CVEE1 CP1 CN1 CVDD1
1uF
1uF
MS0586-E-01
-1-
2007/08
1 page  
ASAHI KASEI
[AK4254]
ABSOLUTE MAXIMUM RATINGS
(AVSS=CVSS1=CVSS2=0V; Note: 1)
Parameter
Symbol
min max Units
Power Supply (Note: 2)
AVDD
-0.3 4.0 V
CVDD1
CVDD2
-0.3 4.0 V
-0.3 4.0 V
Input Current (any pins except for supplies)
IIN
- ±10 mA
Input Voltage (Note: 3)
VIN -0.3 AVDD+0.3 V
(VIN1-7, I2C/SEL22, CDTI/SDA/SEL21,
or 4.0
CCLK/SCL/SEL20, CSN/SEL12,
CAD1/SEL11, CAD0/SEL10, PDN, P/S pins)
Ambient Operating Temperature
Ta -40 85 °C
Storage Temperature
Tstg -65 150 °C
Note: 1. All voltages are with respect to ground.
Note: 2. AVSS, CVDSS1 and CVSS2 must be connected to the same analog ground plane.
Note: 3. The external pull-up resistors at the SDA and SCL pins should be connected to the maximum voltage or less.
www.DataSheet4MU.acxomis smaller value between AVDD+0.3V and 4.0V.
The voltage must not be applied to the CN1 and CN2 pins.
WARNING: Operation at or beyond these limits may result in permanent damage to the device.
Normal operation is not guaranteed at these extremes.
RECOMMENDED OPERATING CONDITIONS
(AVSS=CVSS1=CVSS2=0V; Note: 1)
Parameter
Symbol
Min Typ max Units
Power Supply
(Note: 4)
AVDD
2.7 3.0 3.6 V
CVDD1, CVDD2
AVDD
V
Note: 4. AVDD, CVDD1 and CVDD2 must be the same voltage.
*AKEMD assumes no responsibility for the usage beyond the conditions in this datasheet.
DIGITAL CHARACTERISTICS
(Ta = -40∼85°C; AVDD=CVDD1=CVDD2=2.7V∼3.6V)
Parameter
Symbol
min
High-Level Input Voltage
VIH 70%AVDD
Low-Level Input Voltage
VIL -
Low-Level Output Voltage
VOL
-
(SDA pin: Iout= 3mA)
Input Leakage Current
Iin -
typ
-
-
-
-
max
-
30%AVDD
0.4
± 10
Units
V
V
V
μA
MS0586-E-01
-5-
2007/08
5 Page 
ASAHI KASEI
[AK4254]
SEL22 pin SEL21 pin SEL20 pin
VOUT2 pin
L L L Off Note: 14)
L L H VIN1
L H L VIN2
L H H VIN3
H L L VIN4
H L H VIN5
HHL
VIN6
H H H VIN7
Note: 14. When the input setting is “Off”, VOUT2 output is “GND”.
Table 4. Input Selector 2 (Parallel Control Mode)
■ Serial Control Mode (P/S pin = “L”)
www.DaTthaeShAeKe4t45U2.4coismin Serial Control Mode at P/S pin = “L”.
Mode
PDN pin SEL 12-10 bit CVEE1 pin
VOUT1 pin
Power Down mode
L
x
GND
GND
Normal mode
H “000”
GND
GND
H
Except for
“000”
-CVDD1 Video signal output
(x: Don’t Care)
Table 5. VOUT1 mode setting (Serial Control Mode)
Mode
PDN pin SEL 22-20 bit CVEE2 pin
VOUT2 pin
Power Down mode
L
x
GND
GND
Normal mode
H “000”
GND
GND
H
Except for
“000”
-CVDD1 Video signal output
(x: Don’t Care)
Table 6. VOUT2 mode setting (Serial Control Mode)
(a) Power Down mode (PDN pin= “L”)
When PDN pin =“L”, the register is reset and the AK4254 is in Power Down mode. 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 the Serial Control Mode, the each input of VOUT1-2 is set by SEL12-10 bits
and SEL22-20 bits.
SEL12 bit SEL11 bit SEL10 bit
VOUT1 pin
0 0 0 Off Note: 15) (default)
0 0 1 VIN1
0 1 0 VIN2
0 1 1 VIN3
1 0 0 VIN4
1 0 1 VIN5
1 1 0 VIN6
1 1 1 VIN7
Note: 15. When the input setting is “Off”, VOUT1 output is “GND”.
Table 7. Input Selector 1 (Serial Control Mode)
MS0586-E-01
- 11 -
2007/08
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet AK4254.PDF ] | |
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