TDA9964 View Datasheet(PDF) - Philips Electronics
Part Name
Description
MFG CO.
'TDA9964' PDF : 24 Pages View PDF
Philips Semiconductors
12-bit, 3.0 V, 30 Msps analog-to-digital
interface for CCD cameras
Objective specification
TDA9964
Power and grounding recommendations
When designing a printed-circuit board for applications
such as PC cameras, surveillance cameras, camcorders
and digital still cameras, care should be taken to minimise
the noise.
For the front end integrated circuit, the basic rules of
printed-circuit board design and implementation of analog
components (such as classical operational amplifiers)
must be respected, particularly with respect to power and
ground connections.
The following additional recommendation is given for the
CDS input pin(s) which is (are) internally connected to the
programmable gain amplifier:
The connections between CCD interface and CDS input
should be as short as possible and a ground ring
protection around these connections can be beneficial.
Separate analog and digital supplies provide the best
solution. If it is not possible to do this on the board, the
analog supply pins must be decoupled effectively from the
digital supply pins. If the same power supply and ground
are used for all the pins, the decoupling capacitors must be
placed as closely as possible to the IC package.
To minimise the noise caused by package and die
parasitics in a two-ground system, the following
recommendation must be implemented:
All analog and digital supply pins must be decoupled to the
analog ground plane. Only the ground pin associated with
the digital outputs must be connected to the digital ground
plane. All other ground pins should be connected to the
analog ground plane. The analog and digital ground
planes must be connected together at one point as closely
as possible to the ground pin associated with the digital
outputs.
The digital output pins and their associated lines should be
shielded by the digital ground plane, which can then be
used as return path for digital signals.
2000 May 02
17
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