MCP3565R datasheet(43/108 Pages) MICROCHIP

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DS20006401C-page 43

MCP3565R

Since the converter is effectively doing two conversions

when the AZ_MUX bit is enabled, the conversion time

is equal to 2 * TCONV in this mode. As described in

Section 5.1.3 “ADC Offset Cancellation Algorithm”,

this selection is not compatible with the Continuous

Conversion mode; therefore, the output data rate is

equal to 1/(2 * TCONV) in this mode.

Table 5-6 summarizes the possible filter settings and

their associated Conversion Time, TCONV, as well as

their output data rate (DRCLK) in Continuous mode.

When OSR is larger than 20480 for typical master clock

frequency, MCLK = 4.9152 MHz, the device includes

an additional 50/60 Hz rejection by aligning decimation

filter notches with a multiple of 50/60 Hz depending on

the OSR setting. The rejection band strongly depends

on the master clock accuracy and corresponds to a

first-order decimation filter rejection rate.

The high OSR settings can be used for applications

requiring very low noise and slow data rates.

Figure 5-6 shows the frequency response of the

decimation filter with default settings. Figure 5-7

represents the frequency response of the filter with the

highest OSR settings and a line rejection at 60 Hz.

TABLE 5-6:

OVERSAMPLING RATIO AND SINC FILTER RELATIONSHIP

OSR[3:0] OSR3 OSR1 Total

OSR

ADC Resolution

in Bits

(No Missing

Codes)

Conversion

Time

(TCONV)

Data Rate in Continuous

Conversion Mode

Data Rate (Hz)

with

MCLK = 4.9152 MHz

Fastest Data Rate (Hz)

with

MCLK = 19.6608 MHz

0 0 0 0 32

96/DMCLK

38400

153600

0 0 0 1 64

192/DMCLK

19200

76800

0 0 1 0 128

128

384/DMCLK

9600

38400

0 0 1 1 256

256

768/DMCLK

4800

19200

0 1 0 0 512

512

1536/DMCLK

2400

9600

0 1 0 1 512

1024

2048/DMCLK

1200

4800

0 1 1 0 512

2048

3072/DMCLK

600

2400

0 1 1 1 512

4096

5120/DMCLK

300

1200

1 0 0 0 512

8192

9216/DMCLK

150

600

1 0 0 1 512

16384

17408/DMCLK

300

1 0 1 0 512

20480

21504/DMCLK

240

1 0 1 1 512

24576

25600/DMCLK

200

1 1 0 0 512

40960

41984/DMCLK

120

1 1 0 1 512

49152

50176/DMCLK

100

1 1 1 0 512

160 81920

82944/DMCLK

1 1 1 1 512

192 98304

99328/DMCLK

12.5

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