TDA1387T datasheet(10/16 Pages) PHILIPS

Part #	TDA1387T

Description	Stereo Continuous Calibration DAC CC-DAC

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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10 / 16 page

1995 Dec 11

10

Philips Semiconductors

Preliminary speciﬁcation

Stereo Continuous Calibration DAC (CC-DAC)

TDA1387T

APPLICATION INFORMATION

The TDA1387T offers great ease in designing-in to

printed-circuit board due to its small size and low pin count.

The TDA1387T being a mixed-signal IC in CMOS, some

attention needs to be paid to layout and topology of the

application PCB. The following basic rules will yield the

desired performance. The most important considerations

are:

1. Supply: care should be taken to supply the TDA1387T

with a clean, noiseless supply voltage, for a good

noise performance of the analog parts of the DAC.

Supply purity can easily be achieved by using an

RC-filtered supply.

2. Grounding: preferably a ground plane should be used,

in order to have a low-impedance return available at

any point in the layout. It is advantageous to make a

partitioning of the ground plane according to the nature

of the expected return currents (digital input returns

separate from supply returns separate from the analog

section).

3. Topology: the capacitor decoupling high-frequency

supply interference from VDD to GND should be placed

as close as is physically possible to the IC body,

ensuring a low-inductance path to ground. The digital

input conductors may be shielded by ground leads

running alongside. The placement of a passive ground

plane underside the entire IC surface gives ‘free’

additional decoupling from the IC body to ground as

well as providing a shield between the digital input pins

and the analog output pins.

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