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PDF AK4223 Data sheet ( Hoja de datos )
| Número de pieza | AK4223 | |
| Descripción | 6:2 Audio Switch and 6:2 Video Switch | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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[AK4223]
AK4223
6:2 Audio Switch and 6:2 Video Switch
GENERAL DESCRIPTION
The AK4223 is an AV switch with 6:2 audio and 6:2 video switches. High performances with low power
consumption are achieved by CMOS process. Integrated differential input circuits in audio and video
blocks can separate the external ground noise. In audio block, a differential input circuit, audio LPF and
0dB/-6dB gain amplifier are integrated eliminating the needs for external LPF for audio outputs. In video
block, an input clamp circuit, 6dB amplifier and video driver are integrated, and they also eliminate the
need for external circuits. The AK4223 is offered in a space saving small 48-pin LQFP package, ideal for
car navigation applications.
FEATURES
1. Audio Section
• Selector with 6 inputs and 2 outputs
• Differential Input Circuit for Ground Noise Canceling
• LPF Circuit for Audio signals
• Output Gain Control: 0dB ∼ - 6dB, -1dB Step
• S/(N+D): 90dB (@0dBV)
• Dynamic Range: 94dB
• Channel-Independent Mute Function
2. Video Section
• Selector with 6 inputs and 2 outputs
• Six Composite Signal Inputs
• On-Chip Sync-tip Clamp Circuit
• Video Drivers for Composite Signal Output (+6dB/+3dB/0dB/-3dB)
• Output Gain Control: -1dB ∼ +1dB, 0.1dB Step
• LPF Circuit for Video signals (Bandwidth: 6MHz)
• S/N: 65dB
• Channel-Independent Mute Function
3. Control Section
• Serial µP I/F (I2C)
4. Power Supply: 7.5V ∼ 9.5V
5. Ta = -40 ∼ 85 °C
6. Package: 48pin LQFP
MS1251-E-01
1 2013/08
1 page  
[AK4223]
No. Pin Name
41 RIN1
42 GND1
43 LIN1
44 VCOM
45 SDA
46 SCL
47 VSS2
48 VGND6
PIN/FUNCTION (Continued)
I/O Function
I Audio Signal Input Pin RIN 1.
I Audio GND Input Pin GND 1.
I Audio Signal Input Pin LIN 1.
O
Audio VCOM Voltage Pin.
Normally connected to VSS1 with a 1μF electrolytic capacitor.
I/O Control Data Pin.
I Control Data Clock Pin.
- Video Ground Pin.
I Video GND Input Pin 6.
■ Handling of Unused Pin
The unused I/O pins should be processed appropriately as below.
Classification
Audio Inputs
Video Input
Audio, Video Outputs
Pin Name
LIN1-6, RIN1-6, GND1-6
VIN1-6, VGND1-6
LOUT1-2, ROUT1-2, VOUT1-2
Setting
These pins must be open.
These pins must be connected to VSS2.
These pins must be open.
MS1251-E-01
5 2013/08
5 Page 
[AK4223]
OPERATION OVERVIEW
■ Power Up/Down
The AK4223 can be reset by bringing the RSTN pin = “L” upon power-up. In reset mode, internal resisters are initialized
and the audio and video circuits are in power-down state outputting Hi-Z signals. The RSTN pin must be “L” to execute
this reset when power up the AK4223.
■ Audio and Video Signal Inputs
1. Audio Signal Input
The ground noise is cancelled by the differential input with the same ground for L and R channels. The output of LIN and
RIN are the same phase. LIN1-6, RIN1-6 and GND1-6 pins must be AC coupled with a 0.47uF capacitor.
(Cable)
0.47μF
LIN1-6
RIN1-6
(Cable)
0.47μF
Figure 8. Audio Input Circuit (Differential)
GND1-6
(Cable)
0.47μF
LIN1-6
RIN1-6
GND1-6
0.47μF
Figure 9. Audio Input Circuit (Single-ended)
2. Video Signal Input
Sync-tip output level is fixed by the internal clamp circuit. VIN1-6 pins must be input via a 0.1uF capacitor for AC
coupling.
(Cable)
0.1μF
VIN1-6
(Cable)
0.1μF
VGND1-6
Figure 10. Video Input Circuit (Differential)
(Cable)
0.1μF
VIN1-6
VGND1-6
0.1μF
Figure 11. Video Input Circuit (Single-ended)
MS1251-E-01
11 2013/08
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet AK4223.PDF ] | |
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