MCP33131D datasheet(39/59 Pages) MICROCHIP

39 / 59 page

 2018 Microchip Technology Inc.

DS20005947B-page 39

MCP33131D/MCP33121D/MCP33111D-XX

6.5

Transfer Function

The differential analog input is

VIN = (VIN+) - (VIN-).

The LSB size is given by Equation 6-11. and an

example of LSB size vs. reference voltage is

summarized in Table 6-6.

EQUATION 6-11:

LSB SIZE - EXAMPLE

where N is the resolution of the ADC in bits.

TABLE 6-6:

LSB SIZE VS. REFERENCE

Figure 6-11 shows the ideal transfer function and

Table 6-7 shows the digital output codes for the

MCP33131D/MCP33121D/MCP33111D-XX.

FIGURE 6-11:

Ideal Transfer Function for

Fully-Differential Input Signal.

TABLE 6-5:

SPI CLOCK SPEED VS. INPUT ACQUISITION TIME (TACQ) FOR MCP331X1D-05

Input

Acquisition Time:

tACQ (nS)

Data Conversion

Time (nS)

SPI Clock (fSCLK) Speed Requirement

(Note 1), (Note 2)

Sample Rate:

fS (kSPS)

Conditions

MCP33131D-05

(16-bit)

MCP33121D-05

(14-bit)

MCP33111D-05

(12-bit)

700

1300

23.53MHz

20.59 MHz

17.65 MHz

500

-40°C ≤ TA ≤ 125°C

740

22.22 MHz

19.44 MHz

16.67 MHz

490

790

20.78 MHz

18.18 MHz

15.58 MHz

480

930

17.58 MHz

15.39 MHz

13.19 MHz

450

1200

13.56 MHz

11.86 MHz

10.17 MHz

400

1560

10.39 MHz

9.09 MHz

7.79 MHz

350

2030

7.96 MHz

6.97 MHz

5.97 MHz

300

2700

5.97 MHz

5.22MHz

4.48 MHz

250

3700

4.35 MHz

3.8 MHz

3.26 MHz

200

5370

2.99 MHz

2.62 MHz

2.25 MHz

150

8700

1.84 MHz

1.61 MHz

1.38 MHz

100

Note

This is the minimum SPI clock speed requirement to collect all N-bits of the ADC output during the input acquisition time (tACQ), when the

ADC is operating in continuous input sampling mode.

See Equation 6-10 for the calculation of the SPI clock speed requirement.

Reference

Voltage

(VREF)

LSB Size

MCP33131D-XX

(16-bit)

MCP33121D-XX

(14-bit)

MCP33111D-XX

(12-bit)

2.5V

76.3

V

305.2

V

1.2207 mV

2.7V

82.4

V

329.6

V

1.3184 mV

91.6

V

366.2

V

1.4648 mV

3.3V

100.7

V

402.8

V1.6113 mV

3.5V

106.8

V

427.3

V

1.7090 mV

122.1

V

488.3

V

1.9531 mV

4.5V

137.3

V

549.3

V

2.1973 mV

152.6

V

610.4

V

2.4414 mV

5.1V

155.6

V

622.6

V

2.4902 mV

LSB

2VREF

----------------

-VREF

Differential Analog Input Voltage

+VREF - 1 LSB

-VREF + 0.5 LSB

+VREF - 1.5 LSB

Digital Output Code (Two’s Complement)

011 ...111

000 ...000

011 ...110

100 ...001

100 ...000

-VREF + 1 LSB

MCP33131D bảng dữ liệu(PDF) 39 Page - Microchip Technology

MCP33131D bảng dữ liệu(HTML) 39 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59

bảng dữ liệu tải về

Link URL