VRE205.pdf 데이터시트 (총 5 페이지) - 파일 다운로드 VRE205 데이타시트 다운로드

No Preview Available !

VRE205
Precision Surface Mount
Reference Supply
THALER CORPORATION • 2015 N. FORBES BOULEVARD • TUCSON, AZ. 85745 • (520) 882-4000
FEATURES
www.DataSheet4U.coPmIN AND FUNCTION COMPATIBLE TO REF02
VERY HIGH ACCURACY: 5.000 V OUTPUT ±0.4 mV
EXTREMELY LOW DRIFT: 0.6 ppm/°C -55°C to +125°C
EXCELLENT STABILITY: 6 ppm/1000 Hrs. Typ.
EXCELLENT LINE REGULATION: 6 ppm/V Typ.
WIDE SUPPLY RANGE: +13.5 V to -22.0 V
HERMETIC 20 TERMINAL CERAMIC LCC
MILITARY PROCESSING OPTION
APPLICATIONS
PRECISION A/D and D/A CONVERTERS
TRANSDUCER EXCITATION
ACCURATE COMPARATOR THRESHOLD
REFERENCE
HIGH RESOLUTION SERVO SYSTEMS
DIGITAL VOLTMETERS
HIGH PRECISION TEST and
MEASUREMENT INSTRUMENTS
DESCRIPTION
VRE205 Series Precision Voltage References
provides ultrastable +5.000 V outputs with ±0.4
mV initial accuracy and temperature coefficient as
low as 0.6 ppm/°C over the full military
temperature range. This improvement in accuracy
is made possible by a unique, proprietary
multipoint laser compensation technique
developed by Thaler Corporation. 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 VRE205 series the most
accurate and stable 5V references available.
VRE205 series devices are available in two
operating temperature ranges, -25°C to +85°C
and -55°C to +125°C, and two performance
grades. All devices are packaged in 20 terminal
ceramic LCC packages for maximum long-term
stability. "M" versions are screened for high
reliability and quality.
.
SELECTION GUIDE
Type
Output
Temperature
Operating Range
VRE205C
VRE205CA
VRE205M
VRE205MA
+5V
+5V
+5V
+5V
-25°C to +85°C
-25°C to +85°C
-55°C to +125°C
-55°C to +125°C
Max. Volt
Deviation
0.4mV
0.2mV
0.6mV
0.3mV
VRE205DS REV. C JUNE 1995

No Preview Available !

ELECTRICAL SPECIFICATIONS
Vps =±15V, T = 25°C, RL = 10Kunless otherwise noted.
VRE205
MODEL
C CA M MA
PARAMETERS
MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX
UNITS
ABSOLUTE MAXIMUM RATINGS
Power Supply
+13.5
+22
Operating Temperature -25
85
Storage Temperature -65
150
Short Circuit Protection Continuous
*
*
*
**
**
*
* -55
125 -55
125
**
**
*
***
V
°C
°C
OUTPUT VOLTAGE
www.DataSheet4U.com
VRE205
+5 * * * V
OUTPUT VOLTAGE ERRORS
Initial Error
Warmup Drift
Tmin - Tmax (1)
Long-Term Stability
Noise (.1-10Hz)
800
2
400
6
3
400
1
200
*
*
800
2
600
*
*
400 µV
1 ppm
300 µV
* ppm/1000hrs
* µVpp
OUTPUT CURRENT
Range
±10 *
*
*
mA
REGULATION
Line
Load
6 10
3
**
*
**
*
**
*
ppm/V
ppm/mA
OUTPUT ADJUSTMENT
Range
10 * * * mV
Temperature Coeff.
4
*
*
* µV/°C/mV
(2)
POWER SUPPLY CURRENTS
VRE205 +PS
57
**
**
**
mA
NOTES: *Same as C Models.
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.
VRE205DS REV. C JUNE 1995

No Preview Available !

TYPICAL PERFORMANCE CURVES
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
www.DataSheet4U.com
Temperature oC
VRE205C
VOUT vs. TEMPERATURE
Temperature oC
VRE205CA
VOUT vs. TEMPERATURE
Temperature oC
VRE205M
Temperature oC
VRE205MA
QUIESCENT CURRENT VS. TEMP
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
PSRR VS. FREQUENCY
Temperature oC
Output Current (mA)
Frequency (Hz)
VRE205DS REV. C JUNE 1995

No Preview Available !

DISCUSSION OF PERFORMANCE
THEORY OF OPERATION
APPLICATION INFORMATION
The following discussion refers to the schematic
below. A FET current source is used to bias a 6.3
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
5.000V output. The gain is determined by the
resistor networks R3 and R4: G=1 + R4/R3. The 6.3
zener diode is used because it is the most stable
diode over time and temperature.
www.DataSheet4U.com
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.
Thaler Corporation has developed 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 then adjusting the slope, Thaler Corporation
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.
Figure 2 shows the proper connection of the
VRE205 series voltage references with the optional
trim resistors. Pay careful attention to the circuit
layout to avoid noise pickup and voltage drops in the
lines.
The VRE205 series voltage references have the
ground terminal brought out on two pins (pin 9 and
pin 10) 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 20ppm.
By connecting pin 10 to the power supply ground and
pin 9 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.
VRE205
FIGURE 1
VRE205DS REV. C JUNE 1995

No Preview Available !

www.DataSheet4U.com
FIGURE 2
EXTERNAL CONNECTIONS
+15V
Ref. Gnd.
3 2 1 20 19
4 18
5 17
6 16
7 15
8 14
9 10 11 12 13
10k
VOUT = +5.0V
PIN CONFIGURATION
NC NC NC NC NC
3 2 1 20 19
NC 4
VIN 5
NC 6
NC 7
NC 8
TOP VIEW
VRE205
18 NC
17 NC
16 NC
15 VOUT
14 NC
9 10 11 12 13
REF GND NC TRIM NC
GND
MECHANICAL
INCHES
DIM MIN
MAX
A 0.090 0.110
B 0.022 0.028
D 0.342 0.358
D1 0.048
0.052
E 0.342 0.358
E1 0.045
0.055
j 0.010 REF
h 0.040 REF
L
0.045
0.055
MILLIMETER
MIN MAX
2.29 2.79
0.56 0.71
8.68 9.09
1.22 1.32
8.68 9.09
1.114
1.40
.254 REF
1.02 REF
1.14 1.40
VRE205DS REV. C JUNE 1995