MCP47FVB01 datasheet(44/92 Pages) MICROCHIP

部件名	MCP47FVB01

功能描述	8- /10- /12-Bit Single/Dual Voltage Output Volatile Digital-to-Analog Converters with I짼C??Interface

PDF	92 Pages

Scroll/Zoom	100%

制造商	MICROCHIP [Microchip Technology]

网页	http://www.microchip.com

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44 / 92 page

MCP47FVBXX

DS20005405A-page 44

 2015 Microchip Technology Inc.

5.4

Internal Band Gap

The internal band gap is designed to drive the Resistor

Ladder Buffer.

The resistance of a resistor ladder (RRL) is targeted to

be 140 k

 (40 k), which means a minimum resis-

tance of 100 k

.

The band gap selection can be used across the VDD

voltages while maximizing the VOUT voltage ranges.

For VDD voltages below the 2  Gain  VBG voltage, the

output for the upper codes will be clipped to the VDD

voltage. Table 5-4 shows the maximum DAC register

code given device VDD and Gain bit setting.

TABLE 5-4:

VOUT USING BAND GAP

Max DAC Code (1)

Comment

12-

bit

10-bit 8-bit

5.5

FFFh

3FFh

FFh VOUT(max) = 2.44V(

FFFh

3FFh

FFh VOUT(max) = 4.88V

(3)

2.7

FFFh

3FFh

FFh VOUT(max) = 2.44V(

8DAh

236h

8Dh ~ 0 to 55% range

2.0(4)

D1Dh 347h

D1h ~ 0 to 82% range

2(2) 68Eh

1A3h

68h ~ 0 to 41% range

Note 1:

Without the VOUT pin voltage being clipped

Recommended to use Gain = 1 setting

When VBG = 1.22V typical

Band gap performance achieves full

performance starting from a VDD of 2.0V.

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