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REF5025ID Datasheet(PDF) 9 Page - Texas Instruments

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Part # REF5025ID
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

REF5025ID Datasheet(HTML) 9 Page - Texas Instruments

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APPLICATION INFORMATION
SUPPLY VOLTAGE
OUTPUT ADJUSTMENT USING THE TRIM/NR
R5
60kW
REF50xx
TEMP
V
OUT
GND
TRIM/NR
V
IN
a
T
a
T
(10 A
m
at+25 C)
°
R2
R1
R3
R4
10kW
1kW
1.2V
BASIC CONNECTIONS
DNC
TEMP
V
OUT
V
IN
GND
DNC
NC
TRIM/NR
REF50xx
+V
SUPPLY
10kW
1kW
470kW
DNC
TEMP
V
OUT
V
IN
GND
DNC
NC
TRIM/NR
REF50xx
C
BYPASS
1 Fto10 F
m
m
C
L
1 Fto50 F
m
m
+V
SUPPLY
V
OUT
REF5010
,, REF5020
REF5025, REF5030
REF5040, REF5045, REF5050
www.ti.com.................................................................................................................................................. SBOS410C – JUNE 2007 – REVISED DECEMBER 2008
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.
PIN
The
REF50xx
provides
a
very
accurate,
factory-trimmed voltage output. However, VOUT can
be adjusted using the trim and noise reduction pin
(TRIM/NR, pin 5). Figure 23 shows a typical circuit
that allows an output adjustment of ±15mV
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 output capacitor (C
L) must be connected from
VOUT to GND. The ESR value of CL must be less than
or equal to 1.5
Ω to ensure output stability. To
Figure 23. VOUT Adjustment Using the TRIM/NR
minimize noise, the recommended ESR of CL is
Pin
between 1
Ω and 1.5Ω.
The REF50xx allows access to the bandgap through
the TRIM/NR pin. Placing a capacitor from the
TRIM/NR pin to GND (see Figure 24) in combination
with the internal R3 and R4 resistors creates a
low-pass filter. A capacitance of 1
µF creates a
low-pass filter with the corner frequency between
10Hz and 20Hz. Such a filter decreases the overall
noise measured on the VOUT pin by half. Higher
capacitance results in a lower filter cutoff frequency,
further reducing output noise. Note that use of this
capacitor increases startup time.
Figure 22. Basic Connections
Copyright © 2007–2008, Texas Instruments Incorporated
Submit Documentation Feedback
9
Product Folder Link(s): REF5010 REF5020 REF5025 REF5030 REF5040 REF5045 REF5050


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