VRE3050AS Cirrus Logic Inc, VRE3050AS Datasheet - Page 6

IC VOLT REF PREC 5V 8-SMD

VRE3050AS

Manufacturer Part Number
VRE3050AS
Description
IC VOLT REF PREC 5V 8-SMD
Manufacturer
Cirrus Logic Inc
Datasheet

Specifications of VRE3050AS

Reference Type
Series
Voltage - Output
5V
Tolerance
±0.5mV
Temperature Coefficient
0.6ppm/°C
Voltage - Input
8 ~ 36 V
Number Of Channels
1
Current - Quiescent
4mA
Current - Output
15mA
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
8-SMD
Product
Voltage References
Topology
Series References
Output Voltage
5 V
Average Temperature Coefficient (typ)
0.6 PPM / C
Series Vref - Input Voltage (max)
40 V
Shunt Current (max)
15 mA
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Cathode
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
598-1774
VRE3050
Figure 3.
5. TEMPERATURE PERFORMANCE
The VRE3050 is designed for applications where the initial error at room temperature and drift over temperature
are important to the user. For many instrument manufacturers, a voltage reference with a temperature coefficient
less than 1 ppm/°C makes it possible to not perform a system temperature calibration, a slow and costly process.
Of the three TC specification methods (slope, butterfly, and box), the box method is most commonly used. A box
is formed by the min/max limits for the nominal output voltage over the operating temperature range. The equation
follows:
This method corresponds more accurately to the method of test and provides a closer estimate of actual error than
the other methods. The box method guarantees limits for the temperature error but does not specify the exact shape
and slope of the device under test.
A designer who needs a 14-bit accurate data acquisition system over the industrial temperature range (-40°C to
+85°C), will need a voltage reference with a temperature coefficient (TC) of 1 ppm/°C if the reference is allowed
to contribute an error equivalent to 1LSB. For 1/2LSB equivalent error from the reference you would need a volt-
age reference with a temperature coefficient of 0.5 ppm/°C. Figure 4 shows the required reference TC vs. delta T
change from 25°C for resolution ranging from 8 bits to 20 bits.
6. THERMAL HYSTERISIS
A change in output voltage as a result of a temperature change. When references experience a temperature change
and return to the initial temperature, they do not always have the same initial voltage. Thermal hysterisis is difficult to
correct and is a major error source in systems that experience temperature changes greater than 25°C. Reference
vendors are starting to include this important specification in their datasheets.
PIN CONFIGURATION
6
N/C
+V
GND
N/C
IN
1
2
3
4
T.C. =
VRE3050
VIEW
TOP
V
NOMINAL
V
MAX
10000
1000
0.01
8
7
6
5
100
0.1
x (T
10
1
– V
1
NOISE
REDUCTION
N/C
TRIM
V
MAX
OUT
Reference TC vs. ∆T change from 25°C for 1 LSB change
MIN
– T
MIN
)
x 10
6
®
P r o d u c t I n n o v a t i o n F r o m
1
0
1
0
8 BIT
10 BIT
12 BIT
14 BIT
16 BIT
18 BIT
20 BIT
0
VRE3050DS

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