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REF1925AIDDCR Datasheet(PDF) 15 Page - Texas Instruments

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Part # REF1925AIDDCR
Description  Voltage References
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

REF1925AIDDCR Datasheet(HTML) 15 Page - Texas Instruments

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W
DIFF
REF
BIAS
V
V
2 V

DIFF(MAX)
DIFF (MIN)
6
REF
V
V
Tracking Error
10
(ppm)
V
Temperature Range

§
·
x
¨
¸
x
©
¹
+
+
e-Trim
e-Trim
+
VREF
VBIAS
R3
R4
R1
R2
Q1
Q2
VBE1
VBE2
-
-
+
+
R5
R7
R6
REF1925, REF1930, REF1933, REF1941
www.ti.com
SBOS697 – SEPTEMBER 2014
9 Detailed Description
9.1 Overview
The REF19xx is a family of dual-output, VREF and VBIAS (VREF / 2) band-gap voltage references. The Functional
Block Diagram section provides a block diagram of the basic band-gap topology and the two buffers used to
derive the VREF and VBIAS outputs. Transistors Q1 and Q2 are biased such that the current density of Q1 is greater
than that of Q2. The difference of the two base emitter voltages (VBE1 – VBE2) has a positive temperature
coefficient and is forced across resistor R5. The voltage is amplified and added to the base emitter voltage of Q2,
which has a negative temperature coefficient. The resulting band-gap output voltage is almost independent of
temperature. Two independent buffers are used to generate VREF and VBIAS from the band-gap voltage. The
resistors R1, R2 and R3, R4 are sized such that VBIAS = VREF / 2.
e-Trim™ is a method of package-level trim for the initial accuracy and temperature coefficient of VREF and VBIAS,
implemented during the final steps of manufacturing after the plastic molding process. This method minimizes the
influence of inherent transistor mismatch, as well as errors induced during package molding. e-Trim is
implemented in the REF19xx to minimize the temperature drift and maximize the initial accuracy of both the VREF
and VBIAS outputs.
9.2 Functional Block Diagram
9.3 Feature Description
9.3.1 VREF and VBIAS Tracking
Most single-supply systems require an additional stable voltage in the middle of the analog-to-digital converter
(ADC) input range to bias input bipolar signals. The VREF and VBIAS outputs of the REF19xx are generated from
the same band-gap voltage as shown in the Functional Block Diagram section. Hence, both outputs track each
other over the full temperature range of –40°C to 125°C with an accuracy of 7 ppm/°C (max). The tracking
accuracy increases to 6 ppm/°C (max) when the temperature range is limited to –40°C to 85°C. The tracking
error is calculated using the box method, as described by Equation 2:
where
(2)
Copyright © 2014, Texas Instruments Incorporated
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Product Folder Links: REF1925 REF1930 REF1933 REF1941


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