1. Using the box method, the specified value is the maximum deviation from the output voltage at 25°C
over the specified operating temperature range.
2. The specified values are unloaded.
2
VRE100DS
Product Technology From
VRE100
SELECTION GUIDE
Model
VRE100C
VRE100CA
VRE100M
VRE100MA
VRE101C
VRE101CA
VRE101M
VRE101MA
VRE102C
VRE102CA
VRE102M
VRE102MA
Output (V)
+10
+10
+10
+10
-10
-10
-10
-10
±10
±10
±10
±10
Temperature
Operating Range
-25°C to +85°C
-25°C to +85°C
-55°C to +125°C
-55°C to +125°C
-25°C to +85°C
-25°C to +85°C
-55°C to +125°C
-55°C to +125°C
-25°C to +85°C
-25°C to +85°C
-55°C to +125°C
-55°C to +125°C
Volt Deviation (MAX)
±0.8mV
±0.6mV
±1.2mV
±1.0mV
±0.8mV
±0.6mV
±1.2mV
±1.0mV
±0.8mV
±0.6mV
±1.2mV
±1.0mV
Hermetic 14-pin Ceramic DIP
Package Style HC
2. THEORY OF OPERATION
The following discussion refers to the block diagrams in Figure 1. In operation, approximately 6.3 volts is applied
to the noninverting input of the op amp. The voltage is amplified by the op amp to produce a 10.000 V output. The
gain is determined by the networks R1 and R2: G=1 + R2/R1. The 6.3 V zener diode is used because it is the most
stable diode over time and temperature.
The zener operating current is derived from the regulated output voltage through R3. This feedback arrangement
provides a closely regulated zener current. This current determines the slope of the references’ voltage vs. tempera-
ture function. By trimming the zener current a lower drift over temperature can be achieved. But since the voltage
vs. temperature function is nonlinear this compensation technique is not well suited for wide temperature ranges.
A nonlinear compensation network of thermistors and resistors is used in the VRE series voltage references. This
proprietary network eliminates most of the nonlinearity in the voltage vs. temperature function. By then adjusting the
slope, this series produces a very stable voltage over wide temperature ranges. This network is less than 2% of the
overall network resistance so it has a negligible effect on long term stability. By using highly stable resistors in our
network, we produce a voltage reference that also has very good long term stability.
3. APPLICATION INFORMATION
Page 5 shows the proper connection of the VRE100 series voltage reference with the optional trim resistors. When
trimming the VRE102, the positive voltage should be trimmed first since the negative voltage tracks the positive
side. Pay careful attention to the circuit layout to avoid noise pickup and voltage drops in the lines.
The VRE100 series voltage references have the ground terminal brought out on two pins (pin 6 and pin 7) which
are connected together internally. This allows the user to achieve greater accuracy when using a socket. Voltage
references have a voltage drop across their power supply ground pin due to quiescent current flowing through the
contact resistance. If the contact resistance was constant with time and temperature, this voltage drop could be
trimmed out. When the reference is plugged into a socket, this source of error can be as high as 20 ppm. By con-
necting pin 7 to the power supply ground and pin 6 to a high impedance ground point in the measurement circuit,
the error due to the contact resistance can be eliminated. If the unit is soldered into place the contact resistance is
sufficiently small that it doesn’t effect performance. The VRE series voltage references can be connected with or
without the use of pin 6 and still provide superior performance.
VRE100DS
3
VRE100
4. TYPICAL PERFORMANCE CURVES
V
OUT
vs. TEMPERATURE
Product Technology From
V
OUT
vs. TEMPERATURE
1.2
V
OUT
vs. TEMPERATURE
V
OUT
vs. TEMPERATURE
0.8
0.6
-0.8
-0.6
-1.2
Temperature
o
C
VRE100/101/102C
Temperature
o
C
VRE100/101/102CA
Temperature
o
C
VRE100/101/102M
Temperature
o
C
VRE100/101/102MA
VRE100/101
QUIESCENT CURRENT VS. TEMP
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
PSRR VS. FREQUENCY
Temperature
o
C
Output Current (mA)
Frequency (Hz)
VRE102
POSITIVE OUTPUT
QUIESCENT CURRENT VS. TEMP
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
PSRR VS. FREQUENCY
Temperature
o
C
QUIESCENT CURRENT VS. TEMP
Output Current (mA)
NEGATIVE OUTPUT
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Frequency (Hz)
PSRR VS. FREQUENCY
Temperature
o
C
Output Current (mA)
Frequency (Hz)
4
VRE100DS
Product Technology From
VRE100
EXTERNAL CONNECTIONS
1. Optional Fine Adjust for approximately ±20mV. VRE101 center tap connects to -PS.
PIN CONFIGURATION
TOP VIEW
NC
NC
NC
NC
NC
REF.
GND
GND
FINE
ADJ.
+10V
NC
NC
NC
NC
NC
REF.
GND
GND
TOP VIEW
FINE
ADJ.
-10V
FINE
ADJ.
-PS
NC
NC
NC
-ADJ.
-10V
-ADJ.
-PS
NC
REF.
GND
GND
TOP VIEW
+ADJ.
+10V
VRE100
FINE
ADJ.
+PS
NC
NC
NC
VRE101
VRE102
+ADJ.
+PS
NC
NC
NC
CONTACTING CIRRUS LOGIC SUPPORT
For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America.
For inquiries via email, please contact apex.support@cirrus.com.
International customers can also request support by contacting their local Cirrus Logic Sales Representative.
To find the one nearest to you, go to www.cirrus.com
IMPORTANT NOTICE
Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject
to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant
information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale
supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus
for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third
parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights,
copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives con-
sent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent
does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROP-
ERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE
SUITABLE FOR USE IN PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PROD-
UCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUS-
TOMER’S RISK AND CIRRUS DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. IF THE
CUSTOMER OR CUSTOMER’S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES,
BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL
LIABILITY, INCLUDING ATTORNEYS’ FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES.
Cirrus Logic, Cirrus, and the Cirrus Logic logo designs, Apex Precision Power, Apex and the Apex Precision Power logo designs are trademarks of Cirrus Logic, Inc.
All other brand and product names in this document may be trademarks or service marks of their respective owners.
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