MCP1501 datasheet(8/39 Pages) MICROCHIP

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MCP1501

DS20005474G-page 8

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2.1

Terminology

2.1.1

OUTPUT VOLTAGE

Output voltage is the reference voltage that is available

on the OUT pin.

2.1.2

INPUT VOLTAGE

The input voltage (VIN) is the range of voltage that can

be applied to the VDD pin and still have the device

produce the designated output voltage on the OUT pin.

2.1.3

TEMPERATURE COEFFICIENT (TC)

The output temperature coefficient or voltage drift is a

measure of how much the output voltage will vary from

its initial value with changes in ambient temperature.

The value specified in the electrical specifications is

measured as shown in Equation 2-1.

EQUATION 2-1:

TCOUTPUT CALCULATION

2.1.4

DROPOUT VOLTAGE

The dropout voltage is defined as the voltage difference

between VDD and VOUT under 5 mA load.

2.1.5

LINE REGULATION

An ideal voltage reference will maintain a constant

output voltage regardless of any changes to the input

voltage. However, when real devices are considered, a

small error may be measured on the output when an

input voltage change occurs.

Line regulation is defined as the change in output

voltage (

VOUT) as a function of a change in input

voltage (

VIN), and expressed as a percentage, as

shown in Equation 2-2.

EQUATION 2-2:

Line regulation may also be expressed as %/V or in

ppm/V, as shown in Equation 2-3 and Equation 2-4,

respectively.

EQUATION 2-3:

EQUATION 2-4:

As an example, if the MCP1501-20 is implemented in a

design and a 2 µV change in output voltage is

measured from a 250 mV change on the input, then the

error in percent, ppm, percent/volt, and ppm/volt, as

shown in Equation 2-5 – Equation 2-6.

EQUATION 2-5:

EQUATION 2-6:

VOUT MAX

 VOUT MIN



–

TV

OUT NOM





--------------------------------------------------------------------------- 10

ppm/

C



Where:

VOUT(MAX) = Maximum output voltage over the

temperature range

VOUT(MIN) = Minimum output voltage over the

temperature range

VOUT(NOM) = Average output voltage over the

temperature range

T = Temperature range over which the

data was collected

V

OUT

V

-------------------- 100%



% Line Regulation

V

OUT

VOUT NOM



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







V

----------------------------------------- 100%



----- Line Regulation

V

OUT

VOUT NOM



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







V

----------------------------------------- 10



ppm

----------- Line Regulation

V

OUT

V

-------------------- 100%









V

250 mV

------------------ 100%









.0008%

V

OUT

V

-------------------- 10



V

2.048V

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





250 mV

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









3.90625 ppm

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

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