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CS5378

DS639F3 20

4. POWER SUPPLIES

The CS5378 has three sets of power supply inputs.

One set supplies power to the I/O pins of the device

(VDDPAD), another supplies power to the logic

core (VDDCORE) and the third supplies power to

the PLL (VDDPLL). The I/O pin power supplies

determine the maximum input and output voltages

when interfacing to peripherals, the logic core pow-

er supply largely determines the power consump-

tion of the CS5378 and the PLL power supply

powers the internal PLL circuitry.

4.1 Pin Descriptions

VDDPAD, GNDPAD - Pins 9, 10

Sets the interface voltage to a microcontroller, sys-

tem telemetry, modulator, and test DAC. VDD-

PAD can be driven with voltages from 3.3 V to

5V.

VDDPLL, GNDPLL - Pins 15, 16

Sets the operational voltage of the internal CS5378

PLL circuitry. Can be driven with voltages from

3.3 V to 5 V.

VDDCORE, GNDCORE - Pins 21, 22

Sets the operational voltage of the CS5378 logic

core. VDDCORE can be driven with voltages from

2.5 V to 5 V. A 2.5 V supply will minimize total

power consumption.

4.2 Bypass Capacitors

Each power supply pin should be bypassed with

parallel 1 μF and 0.01 μF caps, or by a single

0.1 μF cap, placed as close as possible to the

CS5378. Bypass capacitors should be ceramic

(X7R, C0G), tantalum, or other good quality di-

electric type.

4.3 Power Consumption

Power consumption of the CS5378 depends pri-

marily on the power supply voltage of the logic

core (VDDCORE) and the programmed digital fil-

ter clock rate. Digital filter clock rates are selected

based on the required output word rate as explained

in “Digital Filter Initialization” on page 38.

821

12 17

14 15

VDDPAD

GNDPAD

GNDCORE

VDDCORE

Figure 10. Power Supply Block Diagram

GNDPLL

VDDPLL

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 87 88

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