MCP1502 datasheet(7/28 Pages) MICROCHIP

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DS20006593A-page 7

MCP1502

2.1

Terminology

2.1.1

OUTPUT VOLTAGE (VOUT)

Output Voltage (VOUT) is the reference voltage that is

available on the OUT pin.

2.1.2

INPUT VOLTAGE (VIN)

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 (TC) or voltage drift

is a measure of how much the output voltage will vary

from its initial value with changes in ambient tempera-

ture. The value specified in the electrical specifications

is measured as shown in Equation 2-1.

EQUATION 2-1:

TC CALCULATION

2.1.4

DROPOUT VOLTAGE (VDO)

The Dropout Voltage (VDO) is defined as the voltage

difference between VDD and VOUT under a 5 mA load,

where VOUT is reduced by 1% from the nominal value.

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 the 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 MCP1502-20 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 and ppm/volt will be as shown in

Equation 2-5 and 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 were 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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