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VRE4110C の電気的特性と機能

VRE4110CのメーカーはETCです、この部品の機能は「Low Cost/ SOIC-8 Precision References」です。


製品の詳細 ( Datasheet PDF )

部品番号 VRE4110C
部品説明 Low Cost/ SOIC-8 Precision References
メーカ ETC
ロゴ ETC ロゴ 




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VRE4110C Datasheet, VRE4110C PDF,ピン配置, 機能
VRE4100 Series
Low Cost, SOIC-8
Precision References
RHOPOINT COMPONENTS LTD • Tel: +44 (0) 1883 717988 • Fax: +44 (0) 1883 712938 • Email: [email protected] Website: www.rhopointcomponents.com
FEATURES
1.024, 1.250, 2.048, 2.500, 4.096V Output
Initial Error: ± 0.05% max.
Temperature Drift: 1.0 ppm/°C max.
Low Noise: 2.2µVp-p (0.1Hz-10Hz, 1.024V)
Low Thermal Hysterisis: 20ppm
±8mA Output Source
Power Down Mode
Industry Standard SOIC-8 pin out
Commercial and Industrial Temp Ranges
Second source for ADR29X, REF19X ,LT1460,
LT1461, LT1798, MAX616X, REF102
DESCRIPTION
The VRE4100 is a low cost, high precision
bandgap reference that operates from +5V. The
device features low noise, digital error correction,
and an SOIC-8 package. The ultrastable output
is 0.05% accurate with a temperature coefficient
as low as 1.0 ppm/°C. The improvement in
overall accuracy is made possible by using
EEPROM registers and CMOS DAC’s for
temperature and initial error correction. The DAC
trimming is done after assembly which eliminates
assembly related shifts.
The VRE4100 is recommended for use as a
reference for 14, 16, or 18 bit data converters
which require a precision reference. The
VRE4100 offers superior performance over
standard on-chip references commonly found
with data converters.
PIN CONFIGURATION
NC 1
VRE4100
+VIN 2
TOP
Enable 3
VIEW
GND 4
8 NC
7 NC
6 VREF
5 NC
FIGURE 1
SELECTION GUIDE
Model
VRE4110B
VRE4110C
VRE4110K
VRE4112B
VRE4112C
VRE4112K
VRE4120B
VRE4120C
VRE4120K
VRE4125B
VRE4125C
VRE4125K
VRE4141B
VRE4141C
VRE4141K
Output
Voltage
V
Temp.
Coeff.
ppm/°C
Temp.
Range °C
1.024
1.024
1.024
1.250
1.250
1.250
2.048
2.048
2.048
2.500
2.500
2.500
4.096
4.096
4.096
1.0 0°C to +70°C
2.0 0°C to +70°C
3.0 -40°C to +85°C
1.0 0°C to +70°C
2.0 0°C to +70°C
3.0 -40°C to +85°C
1.0 0°C to +70°C
2.0 0°C to +70°C
3.0 -40°C to +85°C
1.0 0°C to +70°C
2.0 0°C to +70°C
3.0 -40°C to +85°C
1.0 0°C to +70°C
2.0 0°C to +70°C
3.0 -40°C to +85°C
VRE4100DS REV. A MAY 01

1 Page





VRE4110C pdf, ピン配列
TYPICAL PERFORMANCE CURVES
Load Regulation vs Temperature
Output Voltage vs Load Current
Load Transient Response
Line Regulation vs Temperature
Power Up/Down Ground Current
Line Transient Response
Enable Response
Output Impedance
Power Supply Rejection Ratio
VRE4100DS REV. A MAY 01


3Pages


VRE4110C 電子部品, 半導体
OPERATIONAL NOTES
Input Capacitor
An input capacitor is recommended on the VRE4100
device. A supply bypass capacitor on the input will
assure that the reference is working from a low
impedance source which will improve stability. It
can improve the transient response when the load
current is suddenly increased.
Output Capacitor
The VRE4100 requires a 1µF output capacitor for
loop stabilization (compensation) as well as
transient response. When the load current changes,
the output capacitor must source or sink current
during the time it takes the control loop of the
VRE4100 to respond.
The output capacitor must meet the requirements of
minimum capacitance and equivalent series
resistance (ESR) range. See Capacitor Selection
below.
Capacitor Selection
A minimum value of 0.2µF over the operating
temperature range is recommended. For a 0.22µF
capacitor the ESR range for 0°C -70°C is 0.9 to 6.0,
1.0µF is 0.8 to 6.0, and 10µF is 0.4 to 7.0.
Surface mount tantalum capacitors offer small size
for the value and ESR in the range required for the
VRE4100. The optimum performance for the output
capacitor is achieved with a 1.0µF value.
Aluminum electrolytic capacitors have a relatively
large size for the value. They meet the ESR
requirements at 1.0µF as long as the temperature is
above 0°C. Below 0°C, the ESR increases and it
may exceed the limits indicated in the figures.
Multilayer ceramic capacitors have a small size for
the value, are available in surface mount, and have
excellent RF characteristics. They may not meet the
minimum ESR requirements and have a large
change in value with temperature.
Reverse Current Path
The P-channel pass transistor used in the VRE4100
has an inherent diode connected between the Vin
and VOUT pins. Forcing the output to voltages higher
than the input or pulling Vin below the voltage stored
in the output capacitor by more than the Vbe will
forward bias this diode and current will flow from the
Vout pin to Vin. This will not damage the VRE4100 as
long as the current does not exceed 50mA.
ON/OFF Operation
The VRE4100 features a sleep mode that is
activated by pulling the enable pin low. To turn the
reference on, the enable pin is pulled high. If this
feature is not used, the the enable pin should be tied
to Vin to keep the reference on at all times. The
enable pin must not be left unconnected (floating).
When powered off, the VRE4100 will quickly reduce
both Vout and IQ to zero. During power down, the
charge across the output capacitor is discharged to
ground through the internal circuitry. On power up,
the Vout is restored in less than 200µs.
The signal source used to drive the enable pin can
come from either a totem-pole output or an open
collector output with a pull-up resistor to the
VRE4100 input voltage. The signal source must be
able to swing above and below the voltage
thresholds to guarantee an ON or OFF state. It
must not exceed the absolute maximum rating for
the enable pin.
Output Accuracy
The output accuracy after assembly at room
temperature is made up of three components: initial
accuracy of the device, thermal hysterisis, and
mechanical stress. The initial accuracy is measured
at the factory and may not reflect the actual output
voltage when the devices are mounted to a PCB.
The effects of mechanical stress and thermal
hysterisis can shift the output voltage.
Thermal Hysterisis
Thermal hysterisis is 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
Mechanical Hysterisis
Recommendations to minimize mechanical stress:
1) Mount the VRE4100 near the edges or corners of
the PCB. The center of the board generally has the
highest mechanical and thermal stress.
2) Mechanically isolate the device by cutting a U
shaped slot around the VRE4100. This provides
some mechanical and thermal isolation from the rest
of the circuit.
VRE4100DS REV. A MAY 01

6 Page



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共有リンク

Link :


部品番号部品説明メーカ
VRE4110B

Low Cost/ SOIC-8 Precision References

ETC
ETC
VRE4110C

Low Cost/ SOIC-8 Precision References

ETC
ETC
VRE4110K

Low Cost/ SOIC-8 Precision References

ETC
ETC


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