MAX4397SCTM+ Maxim Integrated Products, MAX4397SCTM+ Datasheet - Page 14

• Manufacturer Part Number: MAX4397SCTM+
• Description: IC SW A/V SCART CON 48-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Switchr

Specifications of MAX4397SCTM+

• Applications: DVD, Set-Top Boxes, TV
• Mounting Type: Surface Mount
• Package / Case: 48-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Both right and left channels have a stereo output for the
TV and VCR SCART. The monaural output, which is a
mix of the TV right and left channels, drives the RF
modulator, RF_MONO_OUT. The monaural mixer, a
resistor summer, attenuates the amplitude of each of
the two signals by 6dB. A 12.54dB gain block follows
the monaural mixer. If the left and right audio channels
Audio/Video Switch for Dual SCART Connectors
Figure 4. MAX4397D Audio Section Functional Diagram
14
ENC_INR+
ENC_INL+
ENC_INR-
ENC_INL-
VCR_INR
VCR_INL
______________________________________________________________________________________
TV_INL
TV_INR
MUTE IS AN INTERNAL SIGNAL
AUDIO INPUTS
DIFF/SE
DIFF/SE
MUTE
MUTE
MUTE
MUTE
Audio Outputs
-6dB, 0dB, OR +6dB
-6dB, 0dB, OR +6dB
VOLUME CONTROL BYPASS
VOLUME CONTROL BYPASS
were completely uncorrelated, then a 9.54dB gain
block is used. See Figures 4 and 5 for the functional
diagram of the audio section.
The TV channel incorporates a zero-crossing detect
(ZCD) circuit that minimizes click noise due to abrupt
signal level changes that occur when switching
between audio signals at an arbitrary moment.
VOLUME CONTROL
VOLUME CONTROL
+6dB TO -56dB
+6dB TO -56dB
Σ/2
ZCD
9.54dB
9.54dB
I
2
C
MUTE
MUTE
MUTE
VCR_OUTL
VCR_OUTR
9.54dB
12.54dB
9.54dB
Clickless Switching
AUDIO OUTPUTS
GNDAUD
TV_OUTL
RF_MONO_OUT
TV_OUTR