MAX11503EUA+ Maxim Integrated Products, MAX11503EUA+ Datasheet - Page 7

• Manufacturer Part Number: MAX11503EUA+
• Description: IC VIDEO Y/C SUMMER W/DVR 8-MSOP
• Manufacturer: Maxim Integrated Products
• Type: Driverr

Specifications of MAX11503EUA+

• Applications: Camera
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX11503 input clamps the sync tip of the video
signal to 250mV at the IC output, forcing the blanking
level to be about 550mV on the coax cables at the ter-
mination resistor. This allows driving video to meet digi-
tal TV specifications without the need for costly
AC-coupling capacitors. Power dissipation is an espe-
cially important consideration if DC-coupling one or two
terminated video coax cables.
The minimum supply voltage depends on the type of
video and the output configuration. Use at least the
minimum supply voltage to preserve the output amplifi-
er’s linearity and video specifications.
The following examples discuss the required minimum
supply voltage under several scenarios. Unless other-
wise specified, these examples assume:
1) The luma input is AC-coupled and therefore the
2) The output amplifier needs 0.800V of overhead.
A PAL test signal is 1.235V
Therefore, the required minimum supply voltage is:
A NTSC signal is 1.0V
the required minimum supply voltage is:
When using SAG correction, the output amplifier needs
an overhead of 800mV, in addition to 130% of the maxi-
mum video level at the output. Assuming an AC-cou-
pled luma input:
For PAL, the minimum required supply voltage is:
sync tip is clamped at 0.250V at the output.
Minimum Supply-Voltage Considerations
V
CC
V
V
CC
CC
= 2 x 1.235 x 1.3 + 0.250 + 0.800 = 4.26V
= 2 x 1.000 + 0.250 + 0.800 = 3.05V
= 2 x 1.235 + 0.250 + 0.800 = 3.5V
_______________________________________________________________________________________
P-P
(755 color bars). Therefore,
P-P
Using SAG Correction
DC-Coupled Output
(100% color bars).
NTSC
PAL
Driver and Chroma Mute
Video Y/C Summer with
For NTSC, the minimum required supply voltage is:
The power dissipation for single 75Ω terminated load is
64mW, and for two 75Ω terminated loads is 106mW. As
a result of the exposed pad, the temperature rise is
minimized.
The MAX11503 outputs are fully protected against short
circuits either to the ground or the positive supply of the
device. The short-circuit protection circuitry limits the
output current to 130mA (typical) per output.
The MAX11503 has an exposed pad on the bottom.
The pad should be externally connected to ground.
Place power-supply decoupling capacitors close to the
device with short traces connecting to the power
planes. Use ceramic 0.1µF bypass and 1µF bulk
capacitors.
For a recommended PCB layout, refer to the MAX11503
EV kit data sheet.
TOP VIEW
V
CC
= 2 x 1.000 x 1.3 + 0.250 +0.800 = 3.65V
*EXPOSED PAD
PCB Layout Recommendations
GND
OUT
SAG
YIN
3
4
1
2
MAX11503
Thermal Considerations
Short-Circuit Protection
*
µMAX
Pin Configuration
7
5
8
6
CIN
CMUTE
PSAVE
V
CC
7