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19-1114; Rev 2; 11/04
High-Precision, 10V Reference
General Description
Maxim's MX581 is a three-terminal, temperaturecompensated, bandgap voltage reference which provides 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 750A. 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 0C to +70C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C PINPACKAGE 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
-55C to +125C 3 TO-39 Can -55C to +125C 3 TO-39 Can
Typical Operating Circuit
BOTTOM VIEW
Pin Configurations
+15V
+VS VOUT
+VS VOUT
MX581
+10V 10k
GND TO-39
10k GND -10V 5k +10V REFERENCE
MX400
TOP VIEW
+10V 1 N.C. 2
8 7
+VS 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 (VIN to GND) .......................................-0.3V, +40V Continuous Power Dissipation TO-39 Can (derate 8.7mW/C above +60C) ..............600mW SO (derate 5.3mW/C above +75C) ..........................400mW Output Short-Circuit Duration (Note 1) ..........................Indefinite Operating Temperature Range Commercial (J, K) ...............................................0C to +70C Extended (J, K) ................................................-40C to +85C Military (S, T) ..................................................-55C to +125C Note 1: Storage Temperature Range .............................-65C to +175C Lead Temperature (soldering, 10s) .................................+300C Die Junction Temperature (TJ) ..........................-55C to +150C Thermal Resistance, Junction to Ambient TO-39 CAN ..............................................................+150C/W SO ............................................................................+170C/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
(VIN = +15V. TA = +25C, unless otherwise noted.)
PARAMETER Output Voltage Tolerance SYMBOL IL = 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 < VIN < 15V Line Regulation No load 15V < VIN < 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) IL VIN > VOUT + 2.5V IQ tON en(P-P) ISC TA = +25C TMIN to TMAX TMIN to TMAX TA = -55C to +65C MX581J/K MX581S/T MX581S/T 10 5 5 0.2 5 0.1Hz to 10Hz Noncumulative IL = 0mA to 5mA IL = 0mA 20 (220) 750 200 50 25 30
mV (ppm/C)
%/V (mV) ppm/mA (V/mA) A s VP-P ppm/kHrs mA
mA
Note 2: CLOAD 10nF (see the Output Current section).
2
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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 (A) 100 800 1.5A/C NOISE SPECTRAL DENSITY (mV/Hz)
VOUT (V)
10.000
700 10 600 TOTAL NOISE (VRMS) 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 +VS = +15V TA = +25C
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 (s)
OUTPUT CURRENT (mA)
Detailed Description
As shown in Figure 1, most applications of the MX581 require no external components. Connections are +VS, VOUT, 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 +VS +10.0V VOUT
MX581
GND
Figure 1. MX581 Basic Connection _______________________________________________________________________________________ 3
High-Precision, 10V Reference MX581
Applications Information
6.8k 10k 4.3k -15V
Precision High-Current Reference
A pnp power transistor, or Darlington, is easily connected 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
+VS
MX581
GND
R
VOUT +10.0V R 22 12 3.9 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 VOUT. Note that the resistor cannot be used at higher input voltages since, as the supply increases, it sources more current than VOUT can sink.
Figure 2. Optional Fine Trim Configuration
Voltage Temperature Coefficient
The temperature characteristic of the MX581 consistently follows an "S-curve" (see Typical Operating Characteristics). A five-point 100% test guarantees compliance with -55C to +125C specifications and a three-point 100% test guarantees 0C to +70C specifications. The voltage change specifications in the Electrical Characteristics table state the maximum deviation over temperature from the reference's initial value at +25C, 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.
VIN 15V
470
2N6040 C1 0.1F +VS VOUT
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.
VOUT 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 180s after power is applied.
Figure 3. High-Current Precision Supply
12.5V 5% +VS VOUT
MX581
580 5% 10V AT 0mA TO 5mA
GND
Figure 4. 12V Supply Connection 4 _______________________________________________________________________________________
High-Precision, 10V Reference
Current Limiter
By adding a single resistor as shown in Figure 5, the MX581 is turned into a precision current limiter for applications where the driving voltage is 12.5V to 40V. The programmed current ranges from 0.75mA to 5mA. When using the 2-terminal connection, the load and the bias resistor must be selected so that the current flowing in the reference is maintained between 1mA and 5mA. The operating temperature range for this connection is limited to -55C to +85C.
MX581
Negative 10V Reference
Where a -10V reference is required, the MX581 can be connected as a two-terminal device and biased like a zener diode. The circuit is shown in Figure 6. +VS and VOUT are connected to the system's analog ground and the MX581's GND pin is connected, through a resistor, to the negative supply. With 1mA flowing in the reference, the output voltage is typically 2mV greater than what is obtained with the conventional, positive hook-up.
Reference for CMOS DACs and ADCs
The MX581 is well suited for use with a wide variety of digital-to-analog converters, especially CMOS DACs. Figure 7 shows a circuit in which an MX7533 10-bit DAC outputs 0 to -10V when using a +10V reference. For a positive DAC output, the MX581 is configured as a 2-terminal -10V reference (Figure 6) and connected to the DAC's VREF input. In Figure 8, an MX7574 CMOS ADC uses an MX581 for its -10V reference input. The input range for the ADC is 0 to +10V.
+15V +VS +VS VOUT
MX581
VOUT
MX581
15 VREF
I= R
10V + 0.75mA R
GND
14 VDD
MX7533
16 RFB OUT1 1 VOUT 0V TO -10V
MAX400
GND
OUT2 2 GND 3 4-13 DIGITAL INPUT
Figure 5. Two-Component Precision Current Limiter
Figure 7. Low-Power, 10-Bit CMOS DAC Connection
-15V +VS 0.01F VOUT
MX581
ANALOG GND +VS
MX581
1.2k GND 2 3 4 ANALOG INPUT 5
MX7574
VREF BDFS AIN
VDD
1
+5V
GND
VREF -10V
VOUT 0.01F
AGND DGND DB0-DB7 13-6
18
1.2k 5%
-15V DIGITAL OUTPUTS
Figure 6. Two-Terminal -10V Reference
Figure 8. Negative 10V Reference for CMOS ADC 5
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High-Precision, 10V Reference MX581
Chip Topography
0.087" (2.208mm)
+15V +VS VOUT
MX581
1 2 18
CS D0
+VS 0.071" (1.803mm) VOUT
GND
1/3 74C240 3-STATE BUFFER
GND
Figure 9. MX581 Microprocessor Interface
GND
TRANSISTOR COUNT: 72 SUBSTRATE CONNECTED TO GND
6
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High-Precision, 10V Reference
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
MX581
INCHES DIM A A1 B C e E H L MAX MIN 0.069 0.053 0.010 0.004 0.014 0.019 0.007 0.010 0.050 BSC 0.150 0.157 0.228 0.244 0.016 0.050
MILLIMETERS MAX MIN 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 1.27 BSC 3.80 4.00 5.80 6.20 0.40 1.27
N
E
H
VARIATIONS:
1
INCHES
MILLIMETERS MIN 4.80 8.55 9.80 MAX 5.00 8.75 10.00 N MS012 8 AA 14 AB 16 AC
TOP VIEW
DIM D D D
MIN 0.189 0.337 0.386
MAX 0.197 0.344 0.394
D A e B A1 L C
0-8
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, .150" SOIC
APPROVAL DOCUMENT CONTROL NO. REV.
21-0041
B
1 1
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
SOICN .EPS

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