4

LT1461

ELECTRICAL CHARACTERISTICS

Note 8: Long-term drift typically has a logarithmic characteristic and

therefore, changes after 1000 hours tend to be much smaller than before

that time. Total drift in the second thousand hours is normally less than

one third that of the first thousand hours with a continuing trend toward

reduced drift with time. Long-term drift will also be affected by differential

stresses between the IC and the board material created during board

assembly. See the Applications Information section.

Note 9: Hysteresis in output voltage is created by package stress that

depends on whether the IC was previously at a higher or lower

temperature. Output voltage is always measured at 25

°C, but the IC is

cycled hot or cold before successive measurements. Hysteresis is roughly

proportional to the square of the temperature change. Hysteresis is not

normally a problem for operational temperature excursions where the

instrument might be stored at high or low temperature. See Applications

Information section.

TEMPERATURE (

°C)

–60 – 40 –20

2.4980

2.4985

2.4995

2.5000

2.5005

60

80 100

1461 G01

2.4990

0

20

40

120

2.5010

2.5015

2.5020

TEMPCO –60

°C TO 120°C

3 TYPICAL PARTS

2.5V Reference Voltage

vs Temperature

TEMPERATURE (

°C)

–40 – 20

–4

–2

120

1461 G03

–6

–8

0

40

80

100

20

60

0

–5

–3

–7

–1

SUPPLY

∆ = 15V

5V – 20V

2.5V Line Regulation

vs Temperature

2.5V Load Regulation

OUTPUT CURRENT (mA)

0.1

800

1200

1600

1

10

100

1461 G02

400

0

125

°C

25

°C

–55

°C

Curves from the LT1461-2.5 and the LT1461-5 represent the extremes of the voltage options. Characteristic curves for other output

voltages fall between these curves and can be estimated based on their output.

2.5V Ripple Rejection Ratio

vs Frequency

2.5V Minimum Input/Output

Voltage Differential vs Load Current

OUTPUT CURRENT (mA)

0.1

0.1

1

10

1

10

100

1461 G04

–55

°C

25

°C

125

°C

2.5V Supply Current

vs Input Voltage

INPUT VOLTAGE (V)

1000

1461 G05

10

100

525

20

15

10

0

125

°C

–55

°C

25

°C

FREQUENCY (kHz)

0.01

40

50

60

70

80

0.1

1

100

10

1000

1641 G06

30

20

10

0

90

100