MCP4822-ESLASHMS datasheet(14/36 Pages) MICROCHIP

14 / 36 page

MCP4821/MCP4822

DS21953A-page 14

3.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1:

PIN FUNCTION TABLE

3.1

Positive Power Supply Input (VDD)

VDD is the positive power supply input. The input power

supply is relative to AVSS and can range from 2.7V to

5.5V. A decoupling capacitor on VDD is recommended

to achieve maximum performance.

3.2

Chip Select (CS)

CS is the chip select input, which requires an active-low

signal to enable serial clock and data functions.

3.3

Serial Clock Input (SCK)

SCK is the SPI compatible serial clock input.

3.4

Serial Data Input (SDI)

SDI is the SPI compatible serial data input.

3.5

Latch DAC Input (LDAC)

LDAC (the latch DAC synchronization input) transfers

the input latch registers to the DAC registers (output

latches) when low. Can also be tied low if transfer on

the rising edge of CS is desired.

3.6

Hardware Shutdown Input (SHDN)

SHDN is the hardware shutdown input that requires an

active-low input signal to configure the DACs in their

low-power Standby mode.

3.7

DACx Outputs (VOUTA, VOUTB)

VOUTA and VOUTB are DAC outputs. The DAC output

amplifier drives these pins with a range of AVSS to VDD.

3.8

Analog Ground (AVSS)

AVSS is the analog ground pin.

MCP4821

Pin No.

MCP4822

Pin No.

Symbol

Function

VDD

Positive Power Supply Input (2.7V to 5.5V)

Chip Select Input

SCK

Serial Clock Input

SDI

Serial Data Input

LDAC

Synchronization input used to transfer DAC settings from serial

latches to output latches

—

SHDN

Hardware Shutdown Input

—6

VOUTB

DACB Output

AVSS

Analog Ground

VOUTA

DACA Output

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