REF5025-HT datasheet(10/16 Pages) TI1

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Drift +

OUTMAX

* VOUTMIN

OUT

Temp Range

106(ppm)

DNC

TEMP

OUT

GND

DNC

TRIM/NR

REF5025

TEMP

2.6mV/ C

OPA

(1)

NOTE: (1) Low drift op amp

REF5025-HT

SBOS502D – SEPTEMBER 2009 – REVISED APRIL 2012

www.ti.com

TEMPERATURE DRIFT

The REF5025 is designed for minimal drift error,

which is defined as the change in output voltage over

temperature. The drift is calculated using the box

method, as described by the following equation:

(1)

TEMPERATURE MONITORING

The temperature output terminal (TEMP, pin 3)

provides a temperature-dependent voltage output

Figure 28. Buffering the TEMP Pin Output

with approximately 60-k

Ω source impedance. As

seen in Figure 10, the output voltage follows the

POWER DISSIPATION

nominal relationship:

VTEMP PIN = 509 mV + 2.64 × T(°C)

(2)

The REF5025 is specified to deliver current loads of

±10 mA over the specified input voltage range. The

(For –55°C to 125°C only. Refer to Figure 10 of the

temperature of the device increases according to the

TYPICAL CHARACTERISTICS for 125°C to 210°C.)

equation:

This pin indicates general chip temperature, accurate

TJ = TA + PD × θJA

(3)

to approximately ±15°C. Although it is not generally

Where:

suitable for accurate temperature measurements, it

can be used to indicate temperature changes or for

TJ = Junction temperature (°C)

temperature compensation of analog circuitry. A

TA = Ambient temperature (°C)

temperature change of 30°C corresponds to an

PD = Power dissipated (W)

approximate 79-mV change in voltage at the TEMP

θJA = Junction-to-ambient thermal resistance

pin.

(°C/W)

The TEMP pin has high output impedance (see

The REF5025 junction temperature must not exceed

Figure 24). Loading this pin with a low-impedance

the absolute maximum rating of 210°C.

circuit induces a measurement error; however, it does

not have any effect on VOUT accuracy. To avoid

NOISE PERFORMANCE

errors caused by low-impedance loading, buffer the

TEMP pin output with a suitable low-temperature drift

Typical 0.1-Hz to 10-Hz voltage noise for each

op amp as shown in Figure 28.

member of the REF5025 is specified in the Electrical

Characterisitics table. The noise voltage increases

with

output

voltage

and

operating

temperature.

Additional filtering can be used to improve output

noise levels, although care should be taken to ensure

the output impedance does not degrade performance.

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