MAX9598CTL+ Maxim Integrated Products, MAX9598CTL+ Datasheet - Page 24

• 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 set-top box modulates CVBS and mono audio onto
an RF carrier (for example, channel 3), then a simple
application circuit can provide the needed signals (see
Figure 16). A 10kΩ resistor summer circuit between
TV_OUTR and TV_OUTL creates the mono audio signal.
The resistor-divider to ground on TV_Y/CVBS_OUT cre-
ates a video signal with normal amplitude. The unique
feature of the MAX9598 that facilitates this application
circuit is that the audio and video output amplifiers of
Low-Power Audio/Video Switch for
Dual SCART Connectors
24
Figure 15. VCR_R/C_IN Receives a Chroma Signal from the VCR SCART Connector. Notice that the Pulldown Switch on
VCR_R/C_OUT Is Closed and that the Gain-of-2 Amplifier is Off. The Chroma Signal from VCR SCART IS Looped Through to the TV
SCART in the Above Configuration.
Figure 16. Application Circuit to Connect CVBS and Mono Audio from TV SCART to RF Modulator
______________________________________________________________________________________
0.1μF
VCR_R/C_IN
ENC_R/C_IN
ENC_C_IN
Interfacing to an RF Modulator
BIAS
BIAS
BIAS
MAX9598
MAX9598
TV_Y/CVBS_OUT
TV_OUTR
TV_OUTL
LPF
LPF
10kΩ
10kΩ
75Ω OR GREATER
75Ω OR GREATER
MONO AUDIO
75Ω
the MAX9598 can drive multiple loads if VAUD and VVID
are both greater than 3.135V.
Some set-top boxes have a floating chassis problem in
which the chassis is not connected to earth ground. As a
result, the chassis can charge up to 500V. When a
SCART cable is connected to the SCART connector, the
charged chassis can discharge through a signal pin.
The equivalent circuit is a 2200pF capacitor charged to
A
A
V
V
OFF
= 2V/V
= 2V/V
MODULATOR
SCART
Floating-Chassis Discharge
TV
TV_R/C_OUT
VCR_R/C_OUT
RF
Protection and ESD
75Ω
75Ω
SCART
SCART
VCR
TV