MAX9598 Maxim Integrated Products, MAX9598 Datasheet - Page 20

• Manufacturer Part Number: MAX9598
• Description: Low-Power Audio/Video Switch
• Manufacturer: Maxim Integrated Products

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Low-Power Audio/Video Switch for
Dual SCART Connectors
When interrupt is enabled in modes 1 and 2 (see the
Operating Modes section), INT, which is an open-drain
output, pulls low under the following conditions: slow-
switch signals change value, CVBS input signals are
detected or disappear, and CVBS output loads are
added or removed.
When interrupt is enabled in mode 3, INT pulls low only
when the slow-switch signal changes value.
Enable INT by writing a 1 into bit 4 of register 01h. See
Table 11.
The interrupt can be cleared by reading register 0Eh
and 0Fh.
The maximum full-scale audio signal that can be
applied to the audio inputs is 0.5V
ground. The recommended application circuit to atten-
uate and bias an incoming audio signal is shown in
Figure 13.
The audio path has a gain of 4V/V so that the full scale
of the audio output signal is 2V
full scale is desired at the audio outputs, then the full
scale of the audio input signal should be proportionate-
ly decreased below 0.5V
Figure 12. Reading n Bytes of Indexed Data from the MAX9598
20
Figure 11. Reading 1 Indexed Byte of Data from the MAX9598
S
ACKNOWLEDGE FROM MAX9598
______________________________________________________________________________________
S
SLAVE ADDRESS
ACKNOWLEDGE FROM MAX9598
SLAVE ADDRESS
Applications Information
R/W
R/W
0
RMS
A
0
.
ACKNOWLEDGE FROM MAX9598
A
RMS
ACKNOWLEDGE FROM MAX9598
REGISTER ADDRESS
Interrupt Output
. If less than 2V
REGISTER ADDRESS
RMS
Audio Inputs
REPEATED START
biased at
REPEATED START
A
RMS
Sr
A
ACKNOWLEDGE FROM MAX9598
Sr
ACKNOWLEDGE FROM MAX9598
SLAVE ADDRESS
The MAX9598 has four operating modes, which can be
set by writing to bits 6 and 7 of register 10h. See Table 17.
Figure 13. Application Circuit to Connect Audio Source to Audio
Inputs (1µF Capacitor Connected to the Ground-Referenced
Resistors Biases the Audio Signal at Ground, Resistors
Attenuate the Audio Signal)
SLAVE ADDRESS
*R1 VALUES
DAC = CS4334/5/8/9: R1 = 4.53kΩ ±1%
DAC = PCM1742: R1 = 5.57kΩ ±1%
STEREO
AUDIO
DACS
R/W
R/W
1
1μF
1μF
A
1
NOT ACKNOWLEDGE FROM MASTER
A
6.65kΩ
6.65kΩ
R1*
R1*
DATA BYTE
1 BYTE
REGISTER ADDRESS POINTER
DATA BYTE
AUTOINCREMENT INTERNAL
Operating Modes
1 BYTE
ENC_INL
ENC_INR
REGISTER ADDRESS POINTER
AUTOINCREMENT INTERNAL
MAX9598
A
A
P
P