REF50 datasheet(24/52 Pages) TI2

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8.3 Feature Description

8.3.1 Temperature Monitoring

The temperature output terminal (TEMP, pin 3) provides a temperature-dependent voltage output with

approximately 60kΩ source impedance. As illustrated in Figure 6-8, the output voltage follows the nominal

relationship:

REF50xxI, REF50xxAI: VTEMP PIN = 509mV + 2.64 × T(°C)

(1)

REF50xxEI: VTEMP PIN = 625mV + 2.64 × T(°C)

(2)

The TEMP pin indicates general chip temperature, accurate to approximately ±15°C. Although not generally

suitable for accurate temperature measurements, use the TEMP pin to indicate temperature changes or for

temperature compensation of analog circuitry. A temperature change of 30°C corresponds to an approximate

79mV change in voltage at the TEMP pin.

The TEMP pin has high-output impedance (see Section 8.2). Loading the TEMP pin with a low-impedance circuit

induces a measurement error; however, the pin does not have any effect on VOUT accuracy.

To avoid errors caused by low-impedance loading, buffer the TEMP pin output with a suitable low-temperature

drift op amp, such as the OPA333, OPA335, or OPA376, as shown in Figure 8-3.

DNC

TEMP

OUT

GND

DNC

TRIM/NR

REF50xx

TEMP

2.6mV/ C

OPA(1)

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

Figure 8-3. Buffering the TEMP Pin Output

8.3.2 Temperature Drift

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 calculated in Equation 3.

Drift= VOUTMAX−VOUTMIN

VOUT×Temperature Range ×106ppm

(3)

The REF50xx features a maximum drift coefficient of 2.5ppm/°C for the enhanced-grade version, 3ppm/°C for

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

REF50, REF50E

SBOS410O – JUNE 2007 – REVISED OCTOBER 2025

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