VRE305CS [CIRRUS]
Precision Voltage Reference; 精密电压基准
| 型号： | VRE305CS |
| 厂家： | 
CIRRUS LOGIC |
| 描述： | Precision Voltage Reference |
| 文件： | 总5页 (文件大小：639K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
P r o d u c t I n n o v a t i o n F r o m
VRE305
Precision Voltage Reference
FEaTuRES
DESCRIPTION
The VRE305 is a low cost, high precision +5 V refer-
ence. Packaged in an industry standard 8-pin DIP or
SMT, the device is ideal for upgrading systems that
use lower performance references.
♦ +5 V Output, ± 0.5 mV (.01%)
♦ Temperature Drift: 0.6 ppm/ºC
♦ Low Noise: 3 μVP-P (0.1-10Hz)
♦ Industry Standard Pinout: 8-pin DIP or
Surface Mount Package
The device provides ultrastable +5 V output with ±0.5
mV (.01%) initial accuracy and a temperature coeffi-
cient of 0.6 ppm/°C. This improvement in accuracy is
made possible by a unique, patented multipoint laser
compensation technique. Significant improvements
have been made in other performance parameters
as well, including initial accuracy, warm-up drift, line
regulation, and long-term stability, making the VRE305
series the most accurate reference available in a stan-
dard 8-pin DIP or SMT.
♦ Excellent Line Regulation: 6 ppm/V Typical
♦ Output Trim Capability
aPPlICaTIONS
The VRE305 is recommended for use as a refer-
ence for 14, 16, or 18 bit D/A converters which re-
quire an external precision reference. The device
is also ideal for calibrating scale factor on high
resolution A/D converters. The VRE305 offers su-
perior performance over monolithic references.
For enhanced performance, the VRE305 has an exter-
nal trim option for users who want less than 0.01% ini-
tial error. For ultra low noise applications, an external
capacitor can be attached between the noise reduction
pin and the ground pin. A reference ground pin is pro-
vided to eliminate socket contact resistance errors.
Figꢂreꢀꢁ.ꢀBlOCKꢀDIaGRaM
SElECTIONꢀGuIDE
InitiꢄꢃꢀError Temp.ꢀCoeff. Temp.ꢀRꢄnge
Pꢄckꢄge
Options
Modeꢃ
(mV)
(ppm/ºC)
(ºC)
VRE305AS
VRE305AD
VRE305BS
VRE305BD
VRE305CS
VRE305CD
VRE305JS
VRE305JD
VRE305KS
VRE305KD
VRE305LS
VRE305LD
0.5
0.5
0.8
0.8
1.0
1.0
0.5
0.5
0.8
0.8
1.0
1.0
0.6
0.6
1.0
1.0
2.0
2.0
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
-40ºC to +85ºC
-40ºC to +85ºC
-40ºC to +85ºC
-40ºC to +85ºC
-40ºC to +85ºC
-40ºC to +85ºC
SIP8 (GD)
DIP8 (KD)
SIP8 (GD)
DIP8 (KD)
SIP8 (GD)
DIP8 (KD)
SIP8 (GD)
DIP8 (KD)
SIP8 (GD)
DIP8 (KD)
SIP8 (GD)
DIP8 (KD)
8-pinꢀSꢂrfꢄceꢀMoꢂntꢀ
PꢄckꢄgeꢀStyꢃeꢀGD
8-pinꢀDIP
PꢄckꢄgeꢀStyꢃeꢀKD
Copyright © Cirrus Logic, Inc. 2009
MaRꢀ2009
ꢀ
APEX − VRE305DSREVE
(All Rights Reserved)
http://www.cirrus.com
P r o d u c t I n n o v a t i o n F r o m
VRE305
ꢁ.ꢀChaRaCTERISTICSꢀaNDꢀSPECIFICaTIONS
ElECTRICalꢀSPECIFICaTIONS
VPS =±15V, T = +25ºC, RL = 10KΩ Unless Otherwise Noted.
Modeꢃ
a/J
Typ
B/K
Typ
C/l
Typ
Pꢄrꢄmeter
Min
Mꢄx
Min
Mꢄx
Min
Mꢄx
units
aBSOluTEꢀMaXIMuMꢀRaTINGS
Power Supply
±13.5
±15
±22
+70
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
V
Operating Temperature (A,B,C)
Operating Temperature (J,K,L)
Storage Temperature
0
ºC
ºC
ºC
-40
-65
+85
+150
Short Circuit Protection
OuTPuTꢀVOlTaGE
Continuous
*
*
VRE305
+5.0
630
*
*
*
*
V
Temp. Sensor Voltage (Note 1)
OuTPuTꢀVOlTaGEꢀERRORS
mV
Initial Error
(Note 2)
(Note3)
(Note 4)
0.5
0.6
0.80
1.0
1.00
2.0
mV
ppm
Warmup Drift
TMIN - TMAX
1
2
3
ppm/ºC
ppm/1000hrs.
µVpp
Long-Term Stability
Noise (0.1 - 10Hz)
OuTPuTꢀCuRRENT
Range
6
3
*
*
*
*
±10
*
mA
REGulaTION
Line
6
3
10
*
*
*
*
*
*
*
*
ppm/V
Load
ppm/mA
OuTPuTꢀaDJuSTMENT
Range
10
5
*
*
*
*
mV
mA
POWERꢀSuPPlYꢀCuRRENT (Note 5)
VRE305 +PS
7
NOTES:
*
Same as A/J Models.
1. The temp. reference TC is 2.1 mV/ ºC
2. The specified values are without external trim.
3. The temperature coefficient is determined by the box method using the following formula:
VMAX – VMIN
T.C. =
x 106
VNOMINAL x (TMAX – TMIN
)
4. The specified values are without the external noise reduction capacitor.
5. The specified values are unloaded.
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P r o d u c t I n n o v a t i o n F r o m
VRE305
2.ꢀTYPICalꢀPERFORMaNCEꢀCuRVES
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
Temperature oC
VRE305A
Temperature oC
VRE305B
Temperature oC
VRE305C
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
Temperature oC
VRE305K
Temperature oC
VRE305J
Temperature oC
VRE305L
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
PSRR VS. FREQUENCY
QUIESCENT CURRENT VS. TEMP
Temperature oC
Output Current (mA)
Frequency (Hz)
VRE305DSꢀ
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3ꢀ
P r o d u c t I n n o v a t i o n F r o m
VRE305
3.ꢀThEORYꢀOFꢀOPERaTION
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 noninvert-
ing 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’ volt-
age 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 tem-
perature 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 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 proper connection of the VRE305 series voltage references with the optional trim resistor for initial error and
the optional capacitor for noise reduction is shown below. The VRE305 reference has the ground terminal brought
out on two pins (pin 4 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 tem-
perature, 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 4 to the power supply ground and pin 7 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. Pay careful attention to the
circuit layout to avoid noise pickup and voltage drops in the lines.
EXTERNalꢀCONNECTIONS
+ VIN
V TEMP OUT
2
3
8
OPTIONAL
+ VOUT
6
NOISE REDUCTION
VRE305
CAPACITOR
CN
10KΩ
5
1µF
OPTIONAL
FINE TRIM
4
7
ADJUSTMENT
REF. GND
PINꢀCONFIGuRaTION
NOISE
REDUCTION
8
7
6
1
2
3
N/C
+VIN
VRE305
REF. GND
TOP
VIEW
TEMP
VOUT
4
5
GND
TRIM
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P r o d u c t I n n o v a t i o n F r o m
VRE305
CONTaCTINGꢀCIRRuSꢀlOGICꢀSuPPORT
For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America.
For inquiries via email, please contact tucson.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
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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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