MB40168 Ver la hoja de datos (PDF) - Fujitsu
Número de pieza
componentes Descripción
Fabricante
MB40168 Datasheet PDF : 21 Pages
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MB40168/MB40178
s NOTES ON PCB LAYOUT
Power Supply Lines
The device’s power supply lines (VCCA, VCCD, AGND and DGND) should be laid out as analog lines and should
be separated in so far as possible from other digital lines in order to reduce noise. Also the track widths of these
lines should be as wide as possible to reduce parasitic impedance.
Coupling Capacitors
The device’s power supply lines VCCA and VCCD and the reference voltage pins VRIN, VREF, VRB, and VRT should
be decoupled to analog ground by means of approx. 1 µF capacitors which should be placed as close as possible
to these pins.
Digital Output Load
The load at the digital outputs should be kept as low as possible to prevent noise in the power supply lines
caused by digital output switching. If, due to long wiring, the load becomes large then a buffer with small input
capacitance should be inserted to reduce load capacitance.
s OTHER NOTES ON OPERATION
When using the D/A converter with its VRIN pin connected to the VREF pin, the A/D converter’s VRB pin must also
be connected to the VREF because otherwise the internal reference voltage generation circuitry cannot output 3 V.
When using the D/A converter with 8 bit resolution the DD9 (LSB) pin should be grounded.
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