MAX4397 MAXIM [Maxim Integrated Products], MAX4397 Datasheet - Page 10

• Manufacturer Part Number: MAX4397
• Description: Audio/Video Switch For Dual SCART Connectors
• Manufacturer: MAXIM [Maxim Integrated Products]

Audio/Video Switch for Dual SCART Connectors
The MAX4397 is a switch matrix that routes audio and
video signals between different ports using the I
interface. The ports consist of the MPEG decoder out-
put, and two SCART connectors for the TV and VCR.
Per EN50049 and IEC 933, the encoder can only input
a signal to the SCART connector, while TV and VCR
SCART connectors are bidirectional.
The MAX4397 circuitry consists of four major sections:
the video section, the audio section, the slow- and fast-
switching section, and the digital interface.
The video section consists of clamp and bias circuitry,
input buffers, reconstruction filters, a switch matrix, a
Y/C mixer, and output buffers. All video inputs are AC-
coupled through a 0.1µF capacitor to set an acceptable
10
MAX4397D
______________________________________________________________________________________
EP
29
30
31
32
33
34
35
37
38
39
40
41
42
43
44
45
46
47
48
PIN
MAX4397S
EP
29
30
31
32
33
34
35
37
38
39
40
41
42
43
44
45
46
47
48
Detailed Description
VCR_Y/CVBS_OUT VCR SCART Luma/Composite Video Output. Internally biased at 1V.
TV_Y/CVBS_OUT
VCR_Y/CVBS_IN
ENC_Y/CVBS_IN
RF_CVBS_OUT
VCR_R/C_OUT
TV_Y/CVBS_IN
TV_R/C_OUT
ENC_R/C_IN
VCR_R/C_IN
TV_G_OUT
TV_B_OUT
TV_R/C_IN
VCR_G_IN
ENC_G_IN
ENC_B_IN
ENC_C_IN
VCR_B_IN
ENC_Y_IN
GNDAUD
NAME
RF Modulator Composite Video Output. Internally biased at 1V.
TV SCART Luma/Composite Video Output. Internally biased at 1V.
TV SCART Red/Chroma Video Output. Internally biased at 1V for Red video signal
and 2.2V for Chroma video signal.
TV SCART Green Video Output. Internally biased at 1V.
TV SCART Blue Video Output. Internally biased at 1V.
VCR SCART Red/Chroma Video Output. Internally biased at 1V for Red video
signals and 2.2V for Chroma video signal.
TV SCART Red/Chroma Video Input. Internally biased at 1.2V for Red video
signals, or 1.9V for Chroma video signals.
TV SCART Luma/Composite Video Input. Internally biased at 1.2V.
VCR SCART Luma/Composite Video Input. Internally biased at 1.2V.
VCR SCART Red/Chroma Video Input. Internally biased at 1.2V for Red video
signals and 1.9V for Chroma video signals.
VCR SCART Green Video Input. Internally biased at 1.2V.
VCR SCART Blue Video Input. Internally biased at 1.2V.
Digital Encoder Luma/Composite Video Input. Internally biased at 1.2V.
Digital Encoder Red/Chroma Video Input. Internally biased at 1.2V for Red video
signals, or 1.9V for Chroma video signals.
Digital Encoder Green Video Input. Internally biased at 1.2V.
Digital Encoder Blue Video Input. Internally biased at 1.2V.
Digital Encoder Luma Video Input. Internally biased at 1.2V.
Digital Encoder Chroma Video Input. Internally biased at 1.9V.
Exposed Paddle. Solder to the circuit board ground (GNDAUD) for proper thermal
and electrical performance.
2
C
DC level using clamp or bias networks. The bidirection-
al Red/Chroma outputs can be connected to ground
using I
Red/Chroma is an input (see the Video Inputs section).
The audio section features an input buffer, a switching
matrix, volume- or gain-control circuitry, and output dri-
vers. The audio inputs are AC-coupled through a 0.1µF
capacitor. Only the audio encoder inputs of the
MAX4397D are different from the MAX4397S. The
MAX4397S has a single-ended audio encoder input
while the audio encoder input for the MAX4397D is dif-
ferential. The TV output audio path has volume control
from -56dB to +6dB in 2dB steps, while the VCR output
audio path has volume control from -6dB to +6dB in
6dB steps. The MAX4397 can be configured to switch
inputs during a zero-crossing function to reduce clicks.
2
C control to make them terminations when
Pin Description (continued)
FUNCTION