MAX9507 Maxim Integrated Products, MAX9507 Datasheet - Page 12

• Manufacturer Part Number: MAX9507
• Description: 1.8V DirectDrive Video Filter Amplifier
• Manufacturer: Maxim Integrated Products

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1.8V DirectDrive Video Filter Amplifier with
Load Detection and Dual SPST Analog Switches
The MAX9507 represents Maxim’s second-generation
of DirectDrive video amplifiers that meet the require-
ments of current and future portable equipment:
• 1.8V Operation: Eliminate the need for 3.3V supply in
• Lower Power Consumption: The MAX9507 reduces
• Internal Fixed Gain of 8: As the supply voltages drop
• Load Reporting: The MAX9507 senses the presence
12
favor of lower supply voltages.
average power consumption by up to 75% com-
pared to the 3.3V first generation (MAX9503/
MAX9505).
for system chips on deep submicron processes, the
video DAC can no longer create a 1V
output, and the gain of 2 found in the previous gen-
eration of video filter amplifiers is not enough.
of a video load. For portable devices, a video load is
not connected most of the time, and turning off the
video encoder saves power. Another benefit of load
reporting is a simpler user interface, eliminating the
need to browse through menus to activate the video
output. Instead, the equipment will automatically
enable this feature.
PIN
10
11
12
13
14
15
16
______________________________________________________________________________________
—
1
2
3
4
5
6
7
8
9
DEV_ADDR
CPGND
NAME
COM1
COM2
GND
SDA
C1N
OUT
NO1
NO2
SCL
V
C1P
LCF
V
EP
IN
DD
SS
Detailed Description
Video Input
I
I
I
Positive Power Supply. Bypass with a 0.1µF capacitor to GND.
Charge-Pump Flying Capacitor Positive Terminal. Connect a 1µF capacitor from C1P to C1N.
Charge-Pump Ground
Charge-Pump Flying Capacitor Negative Terminal. Connect a 1µF capacitor from C1P to C1N.
Charge-Pump Negative Power Supply. Bypass with a 1µF capacitor to GND.
Video Output
Ground
Load Change Flag. Open-drain, active-low signal indicates when a video load change occurs.
Normally Open Terminal 1
Common Terminal 1
Common Terminal 2
Normally Open Terminal 2
Exposed Pad. EP is internally connected to GND. Connect EP to GND.
2
2
2
C-Compatible Serial-Data Input/Output
C-Compatible Serial-Clock Input
C Device Address Input. Connect DEV_ADDR to GND, V
P-P
signal at its
• Dual SPST Analog Switches: The two analog switch-
DirectDrive technology is necessary for a voltage-mode
amplifier to output a 2V
supply. The integrated inverting charge pump creates
a negative supply that increases the output range and
gives the video amplifier enough headroom to drive a
2V
Integrated video filter amplifier circuits operate from a
single supply. The positive power supply usually cre-
ates video output signals that are level-shifted above
ground to keep the signal within the linear range of the
output amplifier. For applications where the positive DC
level is not acceptable, a series capacitor can be
inserted in the output connection in an attempt to elimi-
nate the positive DC level shift. The series capacitor
cannot truly level shift a video signal because the aver-
age level of the video varies with picture content. The
series capacitor biases the video output signal around
ground, but the actual level of the video signal can vary
significantly depending upon the RC time constant and
the picture content.
es are ideal for routing additional audio, video, or
digital signals.
P-P
video signal into a 150Ω load.
FUNCTION
DD
, SCL, or SDA. See Table 4.
P-P
video signal from a 1.8V
Pin Description
DirectDrive
Background