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REF5045ID Datasheet(PDF) 9 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation. Click here to check the latest version.
Part # REF5045ID
Description  Low-Noise, Very Low Drift, Precision VOLTAGE REFERENCE
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Manufacturer  BURR-BROWN [Burr-Brown (TI)]
Direct Link  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

REF5045ID Datasheet(HTML) 9 Page - Burr-Brown (TI)

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APPLICATION INFORMATION
SUPPLY VOLTAGE
OUTPUT ADJUSTMENT (TRIM Pin)
1.2V
60kW
REF50xx
TEMP
V
OUT
V
IN
GND
TRIM
Bandgap
+V
SUPPLY
µ
T
µ
T
(10 A
m
at25 C)
°
BASIC CONNECTIONS
DNC
TEMP
V
OUT
V
IN
GND
DNC
NC
TRIM
REF50xx
+V
SUPPLY
10kW
1kW
470W
TEMPERATURE DRIFT
DNC
TEMP
V
OUT
V
IN
GND
DNC
NC
TRIM
REF50xx
C
BYPASS
1 Fto10 F
m
m
C
L
1 Fto50 F
m
m
+V
SUPPLY
V
OUT
Drift +
V
OUTMAX
* VOUTMIN
V
OUT
Temp Range
106(ppm)
(1)
REF5020,, REF5025
REF5030, REF5040
REF5045, REF5050
SBOS410 – JUNE 2007
The REF50xx is family of low-noise, precision
bandgap voltage references that are specifically
designed for excellent initial voltage accuracy and
The REF50xx family of voltage references features
drift. Figure 21 shows a simplified block diagram of
extremely low dropout voltage. With the exception of
the REF50xx.
the
REF5020,
which
has
a
minimum
supply
requirement
of
2.7V,
these
references
can
be
operated with a supply of 200mV above the output
voltage
in
an
unloaded
condition.
For
loaded
conditions, a typical dropout voltage versus load plot
is shown in Figure 6 of the Typical Characteristics.
The REF50xx provides a very accurate voltage
output. However, VOUT can be adjusted from the
nominal value for the purpose of trimming system
errors by configuring the TRIM pin (pin 5). The TRIM
pin provides for adjustment of the voltage at VOUT
over a ±15mV range. Figure 23 shows a typical circuit
using the TRIM pin to adjust VOUT. When using this
technique,
the
temperature
coefficients
of
the
resistors can degrade the temperature drift at the
output.
Figure 21. REF50xx Simplified Block Diagram
Figure 22 shows the typical connections for the
REF50xx.
A
supply
bypass
capacitor
ranging
between 1
μF to 10μF is recommended. A 1μF to
50
μF,
low-ESR
output
capacitor
(CL) must be
connected to VOUT.
Figure 23. VOUT Adjustment Using the TRIM 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 22. Basic Connections
The REF50xx features a maximum drift coefficient of
3ppm/
°C for the high-grade version, and 8ppm/°C for
the standard-grade.
9
Copyright © 2007, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Link(s): REF5020 REF5025 REF5030 REF5040 REF5045 REF5050


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