REF5045-Q1 datasheet(10/17 Pages) TI

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TEMPERATURE DRIFT

Drift +

OUTMAX

* VOUTMIN

OUT

Temp Range

106(ppm)

(1)

DNC

TEMP

OUT

GND

DNC

TRIM/NR

REF50xx

TEMP

2.6mV/ C

OPA(1)

NOTE:(1)Lowdriftopamp,suchastheOPA333,OPA335,orOPA376.

TEMPERATURE MONITORING

POWER DISSIPATION

NOISE PERFORMANCE

REF5020-Q1, REF5025-Q1, REF5030-Q1

REF5040-Q1, REF5045-Q1, REF5050-Q1

SBOS456B – SEPTEMBER 2008 – REVISED APRIL 2009 ............................................................................................................................................... www.ti.com

The REF50xx 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:

The REF50xx features a maximum drift coefficient of

3 ppm/°C for the high-grade version, and 8 ppm/°C

for the standard-grade.

Figure 26. Buffering the TEMP Pin Output

The temperature output terminal (TEMP, pin 3)

provides a temperature-dependent voltage output

The REF50xx family is specified to deliver current

with approximately 60-k

Ω source impedance. As

loads of ±10 mA over the specified input voltage

seen in Figure 8, the output voltage follows the

range. The temperature of the device increases

nominal relationship:

according to the equation:

VTEMP PIN = 509 mV + 2.64 × T(°C)

TJ = TA + PD × θJA

This pin indicates general chip temperature, accurate

Where:

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

TJ = Junction temperature (°C)

suitable for accurate temperature measurements, it

TA = Ambient temperature (°C)

can be used to indicate temperature changes or for

temperature compensation of analog circuitry. A

PD = Power dissipated (W)

temperature change of 30°C corresponds to an

= Junction-to-ambient thermal resistance

approximate 79-mV change in voltage at the TEMP

(°C/W)

pin.

The REF50xx junction temperature must not exceed

The TEMP pin has high output impedance (see

the absolute maximum rating of 150°C.

Figure 22). Loading this pin with a low-impedance

circuit induces a measurement error; however, it does

not have any effect on VOUT accuracy. To avoid

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

errors caused by low-impedance loading, buffer the

member of the REF50xx family is specified in the

TEMP pin output with a suitable low-temperature drift

Electrical Characteristics: Per Device table. The noise

op amp, such as the OPA333, OPA335, or OPA376,

voltage increases with output voltage and operating

as shown in Figure 26.

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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