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REF5025AIDR Datasheet(PDF) 10 Page - Texas Instruments

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Part # REF5025AIDR
Description  Low-Noise, Very Low Drift, Precision VOLTAGE REFERENCE
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

REF5025AIDR Datasheet(HTML) 10 Page - Texas Instruments

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DNC
TEMP
V
OUT
V
IN
GND
DNC
NC
TRIM/NR
REF50xx
C1
1 F
m
+V
SUPPLY
TEMPERATURE DRIFT
DNC
TEMP
V
OUT
V
IN
GND
DNC
NC
TRIM/NR
REF50xx
V
TEMP
2.6mV/ C
°
OPA(1)
NOTE:(1)Lowdriftopamp,suchastheOPA333,OPA335,orOPA376.
+V
Drift +
V
OUTMAX
* VOUTMIN
V
OUT
Temp Range
106(ppm)
(1)
POWER DISSIPATION
TEMPERATURE MONITORING
NOISE PERFORMANCE
REF5010
,, REF5020
REF5025, REF5030
REF5040, REF5045, REF5050
SBOS410C – JUNE 2007 – REVISED DECEMBER 2008.................................................................................................................................................. www.ti.com
The TEMP pin has high output impedance (see
Figure 21). Loading this pin with a low-impedance
circuit induces a measurement error; however, it 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 25.
Figure 24. Noise Reduction Using the TRIM/NR
Pin
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:
Figure 25. Buffering the TEMP Pin Output
The REF50xx features a maximum drift coefficient of
The REF50xx family is specified to deliver current
3ppm/°C for the high-grade version, and 8ppm/°C for
loads of ±10mA over the specified input voltage
the standard-grade.
range. The temperature of the device increases
according to the equation:
TJ = TA + PD × θJA
Where:
TJ = Junction temperature (°C)
The temperature output terminal (TEMP, pin 3)
provides a temperature-dependent voltage output
TA = Ambient temperature (°C)
with approximately 60k
Ω source impedance. As seen
PD = Power dissipated (W)
in Figure 8, the output voltage follows the nominal
θ
JA
= Junction-to-ambient thermal resistance
relationship:
(°C/W)
VTEMP PIN = 509mV + 2.64 × T(°C)
The REF50xx junction temperature must not exceed
the absolute maximum rating of +150°C.
This pin indicates general chip temperature, accurate
to approximately ±15°C. Although it is not generally
suitable for accurate temperature measurements, it
can be used to indicate temperature changes or for
Typical 0.1Hz to 10Hz voltage noise for each member
temperature compensation of analog circuitry. A
of the REF50xx family is specified in the Electrical
temperature change of 30°C corresponds to an
Characteristics: Per Device table. The noise voltage
approximate 79mV change in voltage at the TEMP
increases
with
output
voltage
and
operating
pin.
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.
10
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Copyright © 2007–2008, Texas Instruments Incorporated
Product Folder Link(s): REF5010 REF5020 REF5025 REF5030 REF5040 REF5045 REF5050


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