MAX9598CTL+ Maxim Integrated Products, MAX9598CTL+ Datasheet - Page 16

• Manufacturer Part Number: MAX9598CTL+
• Description: IC SWITCH DUAL SCART 40TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX9598CTL+

• Function: Switch
• Circuit: 2 x SCART
• On-state Resistance: 7 Ohm
• Voltage Supply Source: Single, Dual Supply
• Voltage - Supply, Single/dual (±): 3 V ~ 3.6 V, ±11.4 V ~ 12.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 40-WFQFN Exposed Pad
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Supply Voltage Range: 3V To 3.6V, 11.4V To 12.6V
• Operating Temperature Range: 0°C To +70°C
• Digital Ic Case Style: TQFN
• No. Of Pins: 40
• Peak Reflow Compatible (260 C): Yes
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Leaded Process Compatible: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

If the supply voltage is greater than 3.135V (5% below
a 3.3V supply), each amplifier can drive two DC-cou-
pled video loads to ground. If the supply is less than
3.135V, each amplifier can drive only one DC-coupled
or AC-coupled video load.
The SCART standard allows for video signals to have a
superimposed DC component within 0 to 2V. Therefore,
most video signals are DC-coupled at the output. In the
unlikely event that the video signal needs to be AC-
coupled, the coupling capacitors should be 220µF or
greater in order to keep the highpass filter formed by
the 37.5Ω equivalent resistance of the video transmis-
sion line to a corner frequency of 4.8Hz or below in
order to keep it well below the 25Hz frame rate of the
PAL standard.
The CVBS outputs have load sense circuits. If enabled,
each load sense circuit checks for a load eight times
per second by connecting an internal 15kΩ pullup
resistor to the output for 1ms. If the output is pulled up,
then no load is present. If the output stays low, then a
load is connected. Read bits 1 and 3 to determine load
status. See Table 19.
The selection of video sources that are sent to the TV
SCART connector are controlled by bits 0 to 4 of the TV
Video Input Control Register (06h) while the selection of
video sources that are sent to the VCR SCART connec-
tor are controlled by bits 0 to 2 of the VCR Video Input
Control Register (08h). See Tables 8, 12, and 14. The
video outputs can be enabled or disabled by bits 2 to 7
of the Output Enable Register (0Dh). See Table 16.
Low-Power Audio/Video Switch for
Dual SCART Connectors
16
Figure 4. MAX9598 Video Output with CVBS Signal (Multiburst
Video Test Signal Shown)
______________________________________________________________________________________
10μs/div
MAX9598 fig04
0V
500mV/div
The MAX9598 supports the IEC 933-1, Amendment 1,
trilevel slow switching that selects the aspect ratio for the
display (TV). Under I
slow-switching output voltage level. Table 2 shows the
valid input levels of the slow-switching signal and the
corresponding operating modes of the display device.
Two bidirectional ports are available for slow-switching
signals for the TV and VCR. The slow-switching input
status is continuously read and stored in the Status
Register (0Eh). The slow-switching outputs can be set
to a logic level or high impedance by writing to the TV
Video Output Control Register (07h) and the VCR Video
Output Control Register (09h). When enabled, INT
becomes active low if the voltage level changes on
TV_SS or VCR_SS. See Tables 8, 13, 15 and 18.
Table 2. Slow-Switching Modes
Figure 5. MAX9598 Video Output with Chroma (C) Signal (75%
Color Bar Video Test Signal Shown)
SIGNAL VOLTAGE (V)
SLOW-SWITCHING
9.5 to 12.6
4.5 to 7.0
0 to 2
2
20μs/div
C control, the MAX9598 sets the
Display device uses an internal
source such as a built-in tuner to
provide a video signal
Display device uses a video signal
from the SCART connector and
sets the display to 16:9 aspect ratio
Display device uses a signal from
the SCART connector and sets the
display to 4:3 aspect ratio
MAX9598 fig05
MODE
Slow Switching
500mV/div
0V