MCP48FVB21 datasheet(61/84 Pages) MICROCHIP

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DS20005466A-page 61

MCP48FVBXX

8.0

TYPICAL APPLICATIONS

The MCP48FVBXX devices are general purpose,

single/dual-channel voltage output DACs for various

applications where a precision operation with low power

and volatile memory is needed.

Applications generally suited for the devices are:

• Set Point or Offset Trimming

• Sensor Calibration

• Portable Instrumentation (Battery-Powered)

• Motor Control

8.1

Power Supply Considerations

The power source should be as clean as possible. The

power supply to the device is also used for the DAC

voltage reference internally if the internal VDD is

selected as the resistor ladder’s reference voltage

(VRxB:VRxA = ‘00’).

Any noise induced on the VDD line can affect the DAC

performance. Typical applications will require a bypass

capacitor in order to filter out high-frequency noise on

the VDD line. The noise can be induced onto the power

supply’s traces or as a result of changes on the DAC

output. The bypass capacitor helps to minimize the

effect of these noise sources on signal integrity.

Figure 8-1 shows an example of using two bypass

capacitors (a 10 µF tantalum capacitor and a 0.1 µF

ceramic capacitor) in parallel on the VDD line. These

capacitors should be placed as close to the VDD pin as

possible (within 4 mm). If the application circuit has

separate digital and analog power supplies, the VDD

and VSS pins of the device should reside on the analog

plane.

FIGURE 8-1:

Bypass Filtering Example

Circuit.

Analog

VDD

SCK

SDO

VSS

VOUT0

To MCU

C1:

0.1 µF capacitor

Ceramic

C2:

10 µF capacitor

Tantalum

C3:

~ 0.1 µF

Optional to reduce noise

in VOUT pin

C4:

0.1 µF capacitor

Ceramic

C5:

10 µF capacitor

Tantalum

C6:

0.1 µF capacitor

Ceramic

MCP48FVBX2

Optional

(a) Circuit when VDD is selected as reference

(Note: VDD is connected to the reference circuit internally.)

(b) Circuit when external reference is used.

Output

VREF

6 LAT/HVC

VOUT1

Analog

VDD

SCK

SDO

VSS

VOUT0

To MCU

MCP48FVBX2

Optional

Output

VREF

6 LAT/HVC

VOUT1

Optional

VREF

VDD

SDI

VDD

SDI

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