VRE402LD [ETC]
Analog IC ; 模拟IC\n
| 型号： | VRE402LD |
| 厂家： | 
ETC |
| 描述： | Analog IC
|
| 文件： | 总5页 (文件大小：420K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
VRE402
Precision
Dual Reference
THALER CORPORATION • 2015 N. FORBES BOULEVARD • TUCSON, AZ. 85745 • (520) 882-4000
FEATURES
PIN CONFIGURATION
• ±2.500 V OUTPUT ± 0.250 mV (.01%)
• TEMPERATURE DRIFT: 0.6 ppm/°C
• LOW NOISE: 1.5µVpp (0.1-10Hz)
1
2
3
14 N/C
N/C
- VOUT
13
12
+VOUT
N/C
VRE402
N/C
•TRACKING ERROR:0.2mVmax.
TOP
VIEW
+VIN
4
- VIN
11
5
6
7
N/C
10
9
N/C
N/C
N/C
• EXCELLENT LINE REGULATION: 6ppm/V Typ.
• SURFACE MOUNT AND DIP PACKAGES
REF. GND
GND
8
FIGURE 1
DESCRIPTION
The VRE402 is a low cost, high precision, ±2.5V
reference. Packaged in 14 pin DIP or SMT
packages, the device is ideal for new designs that
need a high performance reference.
The VRE402 is recommended for use as a
reference for high precision A/D and D/A
converters which require an external precision
reference. The device is ideal for calibrating
scale factor on high resolution A/D converters.
The VRE402 offers superior performance over
monolithic references.
The device provides ultrastable ±2.500V output
with ±0.250 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 developed by Thaler Corporation.
SELECTION GUIDE
Temp.
Range
°C
Temp.
Coeff.
ppm/°C
Initial
Error
mV
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.
Model
VRE402A
VRE402B
VRE402C
VRE402J
VRE402K
VRE402L
0.25
0.40
0.50
0.25
0.40
0.50
0.6
1.0
2.0
0.6
1.0
2.0
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
For designs which use the DIP package in a
socket, there is a reference ground pin to
eliminate reference ground errors.
For package option add D for DIP or S for Surface
Mount to end of model number.
VRE402DS REV. A MAY 1996
ELECTRICAL SPECIFICATIONS
Vps =±15V, T = 25°C, RL = 10KW unless otherwise noted.
VRE402
MODEL
A/J
B/K
C/L
PARAMETER
ABSOLUTE RATINGS
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
Power Supply
±13.5
0
-40
-65
±15
±22
+70
+85
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
V
Operating Temp. (A,B,C)
Operating Temp. (J,K,L)
Storage Temperature
Short Circuit Protection
°C
°C
°C
+150
Continuous
*
*
*
*
OUTPUT VOLTAGE
VRE402
±2.5
V
OUTPUT VOLTAGE ERRORS
Initial Error
Warmup Drift
Tmin - Tmax
Tracking Error
0.25
0.40
0.50
mV
ppm
ppm/ °C
mV
(1)
1
2
3
(2)
0.6
0.2
1.0
0.3
2.0
0.4
(3)
Long-Term Stability
Noise (.1-10Hz)
6
1.5
*
*
*
*
ppm/1000hrs
mVpp
OUTPUT CURRENT
Range
±10
*
*
mA
REGULATION
Line
Load
3
3
10
*
*
*
*
*
*
ppm/V
ppm/mA
POWER SUPPLY CURRENTS (4)
+PS
-PS
7
4
9
6
*
*
*
*
*
*
*
*
mA
mA
NOTES: *Same as A/J Models.
4. The specified values are unloaded.
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
tc =
x 106
Vnominal x (Tmax-Tmin
)
3. The tracking error is the deviation between the
positive and negative output over the operating temp.
range.
VRE402DS REV. A MAY 1996
TYPICAL PERFORMANCE CURVES
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
o
o
o
Temperature C
Temperature C
Temperature C
VRE402A
VRE402B
VRE402C
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
o
o
o
Temperature C
Temperature C
Temperature C
VRE402K
VRE402J
VRE402L
POSITIVE OUTPUT (TYP)
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
QUIESCENT CURRENT VS. TEMP
PSRR VS. FREQUENCY
o
Temperature C
Output Current (mA)
NEGATIVE OUTPUT (TYP)
Frequency (Hz)
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
QUIESCENT CURRENT VS. TEMP
PSRR VS. FREQUENCY
o
Temperature C
Output Current (mA)
Frequency (Hz)
VRE402DS REV. A MAY 1996
DISCUSSION OF PERFORMANCE
THEORY OF OPERATION
This network is less than 2% of the overall network
resistance so it has a negligible effect on long term
stability.
The following discussion refers to the schematic in
figure 2 below. A FET current source is used to bias
a 6.3V 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
2.500V output. The gain is determined by the
resistor networks R3 and R4: G=1 + R4/R3. The
6.3V zener diode is used because it is the most
stable diode over time and temperature.
The VRE402 reference has it’s ground 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 20ppm. 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.
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 adjusting the slope, Thaler Corporation produces
a very stable voltage over wide temperature ranges.
VRE402
FIGURE 2
VRE402DS REV. A MAY 1996
MECHANICAL
FIGURE 3
INCHES
MIN
MILLIMETER
INCHES
MILLIMETER
DIM
A
MAX MIN
.136 2.90
.103 2.48
.056 1.19
.118 2.62
.020 0.22
.062 1.37
.715 17.5
.680 16.9
MAX
3.45
2.62
1.42
3.00
0.51
1.57
18.1
17.2
DIM
E
MIN
.495
.390
.265
.090
.024
.040
MAX MIN MAX
.526 12.5 13.3
.415 9.91 10.5
.270 6.73 6.86
.110 2.29 2.79
.035 0.61 .890
.060 1.02 1.52
.114
.098
.047
.103
.009
.054
.690
.666
B
E1
E2
P
B1
C
C1
C2
D
Q
S
D1
FIGURE 4
INCHES
MILLIMETER
INCHES
MILLIMETER
MAX MIN MAX
.435 10.4 11.0
.415 9.91 10.5
.270 6.73 6.86
.315 7.24 8.00
.225 4.95 5.72
.110 2.29 2.79
.070 1.27 1.79
.060 1.02 1.52
DIM
A
MIN
.114
.018
.047
.097
.009
.690
.666
MAX MIN
MAX
3.45
.690
1.42
2.62
0.51
18.1
17.2
DIM
E
MIN
.410
.390
.265
.285
.195
.090
.050
.040
.136 2.90
.027 .460
.056 1.19
.103 2.46
.020 0.22
.715 17.5
.680 16.9
B
E1
E2
G1
L
B1
B2
C
D
P
D 1
Q
S
VRE402DS REV. A MAY 1996
相关型号：
©2020 ICPDF网 联系我们和版权申明