VRE4100 Series
Low Cost, SOIC-8
Precision References
RHOPOINT COMPONENTS LTD
• Tel: +44 (0) 1883 717988 • Fax: +44 (0) 1883 712938 • Email: sales@rhopointcomponents.com 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.
NC
1
2
3
4
8
NC
NC
V
REF
NC
PIN CONFIGURATION
•
Low Noise: 2.2µV
p-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
+V
IN
Enable
GND
VRE4100
TOP
VIEW
7
6
5
FIGURE 1
SELECTION GUIDE
Output
Voltage
V
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
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.
Model
VRE4110B
VRE4110C
VRE4110K
VRE4112B
VRE4112C
VRE4112K
VRE4120B
VRE4120C
VRE4120K
VRE4125B
VRE4125C
VRE4125K
VRE4141B
VRE4141C
VRE4141K
Temp.
Coeff.
ppm/°C
1.0
2.0
3.0
1.0
2.0
3.0
1.0
2.0
3.0
1.0
2.0
3.0
1.0
2.0
3.0
Temp.
Range °C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
VRE4100DS REV. A MAY 01
www.thaler.com
ABSOLUTE MAXIMUM RATINGS
Power supply to any input pin ….…-0.3V to +5.6V
Operating Temp. (
B,C
) …………..……0°C to 70°C
Operating Temp. (
K
)………………...-40°C to 85°C
Storage Temperature Range……..-65°C to 150°C
Output Short Circuit Duration …….…………....Indefinite
ESD Susceptibility Human Body Model…….…..…..2kV
ESD Susceptibility Machine Model ..………………200V
Lead Temperature (soldering,10 sec)………...….260°C
ELECTRICAL SPECIFICATIONS
Vps =+3V for VRE4110 and VRE4112, Vps =+5V for VRE4125, VRE4125 and VRE4141. T = 25°C, I
load
=1mA, C
out
=1µF unless otherwise noted.
PARAMETER
Input Voltage
Output Voltage Error
(Note 1)
SYMBOL
V
IN
CONDITIONS
MIN
1.8
TYP
MAX
5.5
UNITS
V
%
VRE4100B
V
OUT
VRE4100C/K
VRE4100B
Output Voltage
Temperature Coefficient
(Note 2)
± 0.025% ± 0.050%
± 0.040% ± 0.080%
0.5
1.0
1.5
160
2
2.2
20
50
230
1
20
0.8
2
0.4
1
320
20
200
1.0
2.0
3.0
235
mV
µs
µVp-p
ppm
ppm
µA
ppm/mA
TCV
OUT
V
IN
-V
OUT
T
ON
E
n
VRE4100C
VRE4100K
I
L
= 8 mA
To 0.01% of final value
0.1Hz<f<10Hz
Note 5
ppm/°C
Dropout Voltage
(Note 3)
Turn-On Settling Time
Output Noise Voltage
(Note 4)
Temperature Hysterisis
Long Term Stability
Supply Current
Load Regulation
(Note 6)
Line Regulation
(Note 6)
Logic High Input Voltage
Logic High Input Current
Logic Low Input Voltage
Logic Low Input Current
V
OUT/T
I
IN
V
OUT
/ I
OUT
V
OUT
/ V
IN
V
H
I
H
V
L
I
L
1000 Hours
V
load
= 0mA
1mA
I
Load
8mA
V
IN
5.5V
V
ref
+ 200mV
ppm/V
V
nA
V
nA
Notes:
1.
2.
3.
4.
5.
6.
High temperature and mechanical stress can effect the initial accuracy of the VRE4100 series
references.See discussion on output accuracy.
The temperature coefficient is determined by the box method. See discussion on temperature
performance. All units are 100% tested over temperature.
The minimum input to output differential voltage at which the output voltage drops by 0.5% from nominal.
Based on 1.024V output. Noise is linearly proportional to V
REF.
Defined as change in 25°C output voltage after cycling device over operating temperature range.
Line and load regulation are measured with pulses and do not include output voltage changes due to self
heating.
VRE4100DS REV. A MAY 01
www.thaler.com
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
www.thaler.com
TYPICAL PERFORMANCE CURVES
Total Current (Is
(ON)
) vs Supply Voltage
Total Current (Is
(OFF)
) vs Supply Voltage
Ground Current vs Load Current
Output Voltage Change vs Sink Current I
(SINK)
Dropout Voltage vs Load Current
I
Q
vs Temperature
Dropout Voltage vs Load Current (V
OUT
) = 2.0V
Spectral Noise Density (0.1Hz to 10Hz)
Spectral Noise Density (10Hz to 100kHz)
VRE4100DS REV. A MAY 01
www.thaler.com
BASIC CIRCUIT CONNECTION
Figure 3 shows the proper connection of the
VRE4100 series voltage reference.
To achieve the specified performance, pay careful
attention to the layout. Commons should be
connected to a single point to minimize interconnect
resistances. This will reduce voltage errors, noise
pickup, and noise coupled from the power supply.
TEMPERATURE PERFORMANCE
The VRE4100 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 of 1ppm/°C makes it
possible to eliminate 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:
PIN DESCRIPTION
4
2
3
1,5,7,8
6
GND
Vin
Enable
NC
Vout
These must be connected to
ground
Positive power supply input
Pulled to V
in
for normal
operation.
This pin must be left open
Reference output
+ V
OUT
+ V
IN
Enable
2
VRE4100
3
4
1,5,7,8
6
C
OUT
1µF
NC
Figure 2
External Connections
T
.
C
.
=
V
max
−
V
min
(10
6
)
V
no
min
al
(
T
max
−
T
min
)
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 or slope of the
device under test.
Figure 3
10000
For example 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 1.0ppm/°C if the reference is allowed to
contribute an error equivalent to 1LSB. Figure 3
shows the required reference TC vs. T change from
25°C for resolution ranging from 8 bits to 20 bits.
Reference TC vs. T change from 25°C for 1 LSB change
1000
100
8 BIT
ReferenceTC
(ppm/°C)
10
10 BIT
12 BIT
1
14 BIT
16 BIT
0.1
18 BIT
0.01
1
10
20 BIT
100
VRE4100DS REV. A MAY 01
www.thaler.com
Analog electronics
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