CIRRUS VRE405AS

VRE405
VRE405
P r o d u c t IInnnnoovvaa t i o n FFr roomm
Precision Dual Voltage Reference
Features
DESCRIPTION
The VRE405 is a low cost, high precision, ±5 V reference. Available in 14-pin DIP or SMT packages, the
device is ideal for new designs that need a high performance reference.
♦ ±5 V Output, ± 0.5 mV (.01%)
♦ Temperature Drift: 0.6 ppm/ºC
♦ Low Noise: 3 μVP-P (0.1-10hz)
♦ Tracking Error: 0.3 mV Max.
♦ Excellent Line Regulation: 6 ppm/V Typical
♦ Surface Mount and DIP Package Options
Applications
The VRE405 is recommended for use as a reference for high precision D/A and A/D converters
which require an external precision reference.
The device is ideal for calibrating scale factor on
high resolution A/D converters. The VRE405 offers superior performance over monolithic references.
The device provides ultrastable ±5 V output with ±0.5
mV (.01%) initial accuracy and a temperature coefficient of 0.6 ppm/°C. This improvement in accuracy is
made possible by a unique, patented multipoint laser
compensation technique.
Another key feature of this reference is the 0.3 mV
maximum tracking error between the positive and negative output voltages over the operating temperature
range. This is extremely important in high performance
systems for reducing overall system errors.
For designs which use the DIP package in a socket,
there is a reference ground pin to eliminate the reference ground errors.
Figure 1. BLOCK DIAGRAM
Selection Guide
Model
Initial
Error
(mV)
Temp.
Coeff.
(ppm/ºC)
Temp.
Range
(ºC)
Package
Options
VRE405AS
VRE405AD
VRE405BS
VRE405BD
VRE405CS
VRE405CD
±0.5
±0.5
±0.8
±0.8
±1.0
±1.0
0.6
0.6
1.0
1.0
2.0
2.0
0ºC to +70ºC
0ºC to +70ºC
0ºC to +70ºC
0ºC to +70ºC
0ºC to +70ºC
0ºC to +70ºC
SMT14 (GE)
DIP14 (KE)
SMT14 (GE)
DIP14 (KE)
SMT14 (GE)
DIP14 (KE)
VRE405DS
http://www.cirrus.com
14-pin Surface Mount
Package Style GE
Copyright
© Cirrus
Logic, Inc. 2009
(All Rights Reserved)
14-pin DIP
Package Style KE
MAR 2009
APEX − VRE405DSREVB
VRE405
P r o d u c t I n n o v a t i o nF r o m
1. Characteristics and Specifications
ELECTRICAL Specifications
Vps =±15V, T = +25ºC, RL = 10KΩ Unless Otherwise Noted.
Model
VRE405A
Parameter
VRE405B
VRE405C
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Units
±13.5
±15
±22
*
*
*
*
*
*
V
+70
*
*
*
*
ºC
+150
*
*
*
*
ºC
ABSOLUTE RATINGS
Power Supply
Operating Temperature
0
Storage Temperature
-65
Short Circuit Protection
Continuous
*
*
±5.0
*
*
OUTPUT VOLTAGE
VRE405
V
OUTPUT VOLTAGE ERRORS
Initial Error
(Note 1)
±0.05
Warmup Drift
±0.80
1
TMIN - TMAX
(Note2)
3
0.6
Tracking Error
Noise (0.1 - 10Hz)
(Note 3)
mV
ppm
1.0
0.3
Long-Term Stability
±1.00
2
2.0
0.4
0.5
ppm/ºC
mV
6
*
*
ppm/1000hrs.
3
*
*
µVpp
OUTPUT CURRENT
Range
±10
*
mA
REGULATION
Line
3
10
*
*
*
*
ppm/V
Load
3
*
*
ppm/mA
20
*
*
mV
OUTPUT ADJUSTMENT
Range
POWER SUPPLY CURRENT (Note 4)
+PS
7
9
*
*
*
*
mA
-PS
4
6
*
*
*
*
mA
NOTES:
4. The tracking error is the deviation between the positive and negative output over the operating
temp. range.
5. The specified values are unloaded.
* Same as A Models.
1. The specified values are without external trim.
2. The temperature coefficient (TC) is determined by the box method using the following formula:
VMAX – VMIN
T.C. =
x 106
VNOMINAL x (TMAX – TMIN)
VRE405DS
VRE405
P r o d u c t I n n o v a t i o nF r o m
2. TYPICAL PERFORMANCE CURVES
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
Temperature oC
VRE405A
Temperature oC
VRE405B
Temperature oC
VRE405C
POSITIVE OUTPUT (TYP)
QUIESCENT CURRENT VS. TEMP
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Temperature oC
Output Current (mA)
PSRR VS. FREQUENCY
Frequency (Hz)
NEGATIVE OUTPUT (TYP)
QUIESCENT CURRENT VS. TEMP
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Temperature oC
VRE405DS
Output Current (mA)
PSRR VS. FREQUENCY
Frequency (Hz)
VRE405
P r o d u c t I n n o v a t i o nF r o m
3. THEORY OF OPERATION
The following discussion refers to the block diagram in Figure 1. A FET current source is used to bias a 6.3 V zener
diode. The zener voltage is divided by the resistor network R1 and R2. This voltage is then applied to the noninverting input of the operational amplifier which amplifies the voltage to produce a 5 V output. The gain is determined by
the resistor networks R3 and R4: G=1 + R4/R3. The 6.3 V zener diode is used because it is the most stable diode
over time and temperature.
The current source provides a closely regulated zener current, which determines the slope of the references’ voltage vs. temperature 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 that is used in the VRE series voltage references.
This proprietary network eliminates most of the nonlinearity in the voltage vs. temperature function. By adjusting the
slope, a very stable voltage is produced 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.
The VRE405 reference has it’s ground terminal brought out on two pins (pin 6 and 7) which are connected 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 connecting 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 does not
effect performance.
PIN CONFIGURATION
-
N/C
1
VOUT
2
14
N/C
13
+VOUT
12
N/C
11
+VIN
10
N/C
N/C
3
VRE405
- VIN
4
N/C
5
TOP
VIEW
REF. GND
6
9
N/C
GND
7
8
N/C
VRE405DS
VRE405
P r o d u c t I n n o v a t i o nF r o m
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 [email protected]
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 consent 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 PROPERTY 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 PRODUCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER’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.
VRE405DS