MCP37D31-80ESLASHTE datasheet(45/141 Pages) MICROCHIP

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MCP37D31-80 AND MCP37D21-80

DS20006382A-page 45

 2020 Microchip Technology Inc.

4.7

ADC Clock Selection

This section describes the ADC clock selection and

how to use the built-in Delay-Locked Loop (DLL) and

Phase-Locked Loop (PLL) blocks.

When the device is first powered-up, the external clock

input (CLK+/-) is directly used for the ADC timing as

default. After this point, the user can enable the DLL or

PLL circuit by setting the register bits. Figure 4-11

shows the clock control blocks. Table 4-4 shows an

example of how to select the ADC clock depending on

the operating conditions.

TABLE 4-4:

ADC CLOCK SELECTION (EXAMPLE)

Operating Conditions

Control Bit Settings(1)

Features

Input Clock Duty

Cycle Correction

DCLK Output Phase

Delay Control

CLK_SOURCE = 0 (Default)(2)

• DLL output is not used

• Decimation is not used

(Default)(3)

EN_DLL = 0

EN_DLL_DCLK = 0

EN_PHDLY = 0

Not Available

EN_DLL = 1

EN_DLL_DCLK = 0

EN_PHDLY = 0

Available

• DLL output is used

• Decimation is not used

EN_DLL = 1

EN_DLL_DCLK = 1

EN_PHDLY = 1

Available

• DLL output is not used

• Decimation is used(4)

EN_DLL = 0

EN_DLL_DCLK = X

EN_PHDLY = 1

Not Available

EN_DLL = 1

EN_DLL_DCLK = 0

EN_PHDLY = 1

Available

CLK_SOURCE = 1(5)

• Decimation is not used

EN_DLL = X

EN_DLL_DCLK = X

EN_PHDLY = 0

Not Available

Available

• Decimation is used(4)

EN_DLL = X

EN_DLL_DCLK = X

EN_PHDLY = 1

Note 1:

See Addresses 0x52, 0x53, and 0x64 for bit settings.

The sampling frequency (fS) of the ADC core comes directly from the input clock buffer

Output data is synchronized with the output data clock (DCLK), which comes directly from the input clock buffer.

While using decimation, output clock rate and phase delay are controlled by the digital clock output control block

The sampling frequency (fS) is generated by the PLL circuit. The external clock input is used as the reference input

clock for the PLL block.

MCP37D31-80E/TE Datasheet(PDF) 45 Page - Microchip Technology

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