Not Recommended for New Designs
This product was manufactured for Maxim by an outside wafer foundry
using a process that is no longer available. It is not recommended for
new designs. The data sheet remains available for existing users.
A Maxim replacement or an industry second-source may be available.
Please see the QuickView data sheet for this part or contact technical
support for assistance.
For further information,
contact Maxim’s Applications Tech Support.
19-1114; Rev 2; 11/04
High-Precision, 10V Reference
General Description
Maxim’s MX581 is a three-terminal, temperature-
compensated, bandgap voltage reference which pro-
vides a precision 10V output from an unregulated input of
12.5V to 30V. Laser trimming is used to minimize initial
error and temperature drift, to as low as 10mV and
15ppm/°C with the MX581.
No external components are needed to achieve full
accuracy over the operating temperature range. Total
supply current to the device, including the internal output
buffer amplifier is typically 750µA.
The MX581 is designed for use with 8- to 14-bit ADCs
and DACs as well as data acquisition systems. The
reference is available in a 3-pin T0-39 metal can and an
8-pin SO surface-mount package.
♦
±10mV Tolerance (MX581K)
♦
Low Tempco—15ppm/°C max (MAX581K)
♦
No External Components or Trims
♦
Short-Circuit Proof
♦
Output Sources and Sinks Current
♦
10mA Output Current
♦
Low-Supply Current—1.0mA (max)
♦
Three-Terminal Package
Features
MX581
Applications
CMOS DAC Reference
A/D Converter Reference
Measurement Instrumentation
Threshold Detectors
Precision Analog Systems
PART
MX581JH
MX581KH
MX581JCSA
MX581KCSA
MX581JESA
MX581KESA
MX581SH
MX581TH
Ordering Information
TEMP RANGE
0°C to +70°C
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
PIN-
PACKAGE
3 TO-39 Can
3 TO-39 Can
8 SO
8 SO
8 SO
8 SO
ERROR
±30mV
±10mV
±30mV
±10mV
±30mV
±10mV
±20mV
±10mV
-55°C to +125°C 3 TO-39 Can
-55°C to +125°C 3 TO-39 Can
Typical Operating Circuit
BOTTOM VIEW
Pin Configurations
+15V
+V
S
V
OUT
+V
S
V
OUT
MX581
+10V
10kΩ
GND
TO-39
10kΩ
GND
-10V
5kΩ
+10V REFERENCE
MX400
TOP VIEW
+10V 1
N.C. 2
8
7
+V
S
N.C.
N.C.
N.C.
MX581
N.C.
3
6
5
GND 4
SO
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
High-Precision, 10V Reference
MX581
ABSOLUTE MAXIMUM RATINGS
Input Voltage (V
IN
to GND) .......................................-0.3V, +40V
Continuous Power Dissipation
TO-39 Can (derate 8.7mW/°C above +60°C) ..............600mW
SO (derate 5.3mW/°C above +75°C) ..........................400mW
Output Short-Circuit Duration (Note 1) ..........................Indefinite
Operating Temperature Range
Commercial (J, K) ...............................................0°C to +70°C
Extended (J, K) ................................................-40°C to +85°C
Military (S, T) ..................................................-55°C to +125°C
Note 1:
Storage Temperature Range .............................-65°C to +175°C
Lead Temperature (soldering, 10s) .................................+300°C
Die Junction Temperature (T
J
) ..........................-55°C to +150°C
Thermal Resistance, Junction to Ambient
TO-39 CAN ..............................................................+150°C/W
SO ............................................................................+170°C/W
Absolute maximum power dissipation must not be exceeded.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
IN
= +15V. T
A
= +25°C, unless otherwise noted.)
PARAMETER
Output Voltage Tolerance
SYMBOL
I
L
= 0mA
CONDITIONS
MX581J/S
MX581K/T
MIN
TYP
MAX
30
±10
13.5
(30)
19.5
(30)
6.75
(15)
13
(20)
30
(30)
15
(15)
0.005
(1.0)
0.002
(3.0)
50
(550)
1000
UNITS
mV
MX581JH/JCSA
MX581JESA
Output Voltage Change with
Temperature
(Temperature Coefficient)
MX581KH/KCSA
MX581KESA
MX581S
MX581T
12.5V < V
IN
< 15V
Line Regulation
No load
15V < V
IN
< 30V
Load Regulation
Quiescent Supply Current
Turn-On Settling Time to 0.1%
Noise
Long-Term Stability
Short-Circuit Current
Source
Output Current
Sink (Note 2)
I
L
V
IN
> V
OUT
+
2.5V
I
Q
t
ON
e
n(P-P)
I
SC
T
A
= +25°C
T
MIN
to T
MAX
T
MIN
to T
MAX
T
A
= -55°C to
+65°C
MX581J/K
MX581S/T
MX581S/T
10
5
5
0.2
5
0.1Hz to 10Hz
Noncumulative
I
L
= 0mA to 5mA
I
L
= 0mA
20
(220)
750
200
50
25
30
mV
(ppm/°C)
%/V
(mV)
ppm/mA
(µV/mA)
µA
µs
µV
P-P
ppm/kHrs
mA
mA
Note 2:
C
LOAD
≥
10nF (see the
Output Current
section).
2
_______________________________________________________________________________________
High-Precision, 10V Reference
MX581
Typical Operating Characteristics
OUTPUT VOLTAGE
vs. TEMPERATURE
MX581 toc01
QUIESCENT CURRENT
vs. TEMPERATURE
MX581 toc02
SPECTRAL NOISE DENSITY
AND TOTAL RMS NOISE
vs. FREQUENCY
MX581toc03
10.005
1000
1000
900
SUPPLY CURRENT (µA)
100
800
1.5µA/°C
NOISE SPECTRAL DENSITY
(mV/√Hz)
V
OUT
(V)
10.000
700
10
600
TOTAL NOISE (µV
RMS
) UP TO
SPECIFIED FREQUENCY
1
-55 -40 -20
0
20
40
60
80 100 125
10
100
1k
10k
100k
1M
TEMPERATURE (°C)
FREQUENCY (Hz)
9.995
-55 -40 -20
0
20
40
60
80 100 125
TEMPERATURE (°C)
500
MX581 OUTPUT VOLTAGE
vs. SINK AND SOURCE CURRENT
14
OUTPUT VOLTAGE (V)
12
10
8
INPUT (V)
6
4
2
0
-25 -20 -15 -10 -5
SOURCE
0
5
10 15 20 25
SINK
+V
S
= +15V
T
A
= +25°C
MX581 toc04
OUTPUT SETTLING
CHARACTERISTICS
12
OUTPUT (V)
MX581 toc05
10.030
OUTPUT (V)
11
10.020
10.010
10
20
10
0
0
50 100 150 200 250
10.000
SETTLING TIME (µs)
OUTPUT CURRENT (mA)
Detailed Description
As shown in Figure 1, most applications of the MX581
require no external components. Connections are +V
S
,
V
OUT
, and GND (GND is tied to the case in the TO-5
package). Usually the desired accuracy is obtained by
selecting the appropriate device grade. However, any
part can be adjusted to a tighter tolerance, or to slightly
different voltage, using the fine trim circuit in Figure 2.
The table in Figure 2 lists the trim range for different
values of R in the figure, and also shows the effect on
temperature coefficient.
+12.5V TO +30V
+V
S
+10.0V
V
OUT
MX581
GND
Figure 1. MX581 Basic Connection
_______________________________________________________________________________________
3
High-Precision, 10V Reference
MX581
Applications Information
6.8kΩ
10kΩ
4.3kΩ
-15V
Precision High-Current Reference
A pnp power transistor, or Darlington, is easily connect-
ed to the MX581 to greatly increase its output current.
The circuit of Figure 3 provides a +10V output at up to
4A. If the load has a significant capacitive component,
compensation capacitor, C1, should be added. If the
load is purely resistive, high-frequency supply rejection
is improved without C1.
+15V
+V
S
MX581
GND
R
V
OUT
+10.0V
R
22Ω
12Ω
3.9Ω
TRIM
RANGE
±30mV
±10mV
±5mV
MAX.
∆TCR
3.5ppm/°C
2.0ppm/°C
0.6ppm/°C
Low Input Voltage
Although line regulation is specified from 12.5V to 40V,
the MX581 can operate with a +12V ±5% input by
adding a resistor as shown in Figure 4. The resistor
reduces the current that must be supplied from V
OUT
.
Note that the resistor cannot be used at higher input
voltages since, as the supply increases, it sources
more current than V
OUT
can sink.
Figure 2. Optional Fine Trim Configuration
Voltage Temperature Coefficient
The temperature characteristic of the MX581 consis-
tently follows an “S-curve” (see
Typical Operating
Characteristics).
A five-point 100% test guarantees
compliance with -55°C to +125°C specifications and
a three-point 100% test guarantees 0°C to +70°C
specifications.
The voltage change specifications in the
Electrical
Characteristics
table state the maximum deviation over
temperature from the reference’s initial value at +25°C,
as well as drift in ppm/°C. By adding the maximum
deviation for a given device to its initial tolerance, the
total error is quickly determined.
V
IN
≥
15V
470Ω
2N6040
C1
0.1µF
+V
S
V
OUT
MX581
Output Current
The MX581 is unique in that it can sink as well as
source current. The circuit is also protected for output
shorts to either +VS or GND. The output voltage versus
current characteristic is shown in the
Typical Operating
Characteristics.
For applications that require the MX581
to sink current, maintain a load capacitance of 10nF or
greater for proper operation.
V
OUT
10V AT 4A
GND
Dynamic Performance
The turn-on characteristic and settling performance of
the MX581 are shown in the
Typical Operating
Characteristics.
Both coarse and fine transient
response is shown. The reference typically settles to
1mV within 180µs after power is applied.
Figure 3. High-Current Precision Supply
12.5V
±5%
+V
S
V
OUT
MX581
580Ω 5%
10V AT 0mA TO 5mA
GND
Figure 4. 12V Supply Connection
4
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