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19-1115; Rev 2; 11/04
Pin-Programmable, Precision Voltage Reference
General Description
Maxim's MX584 is a temperature-compensated, bandgap voltage reference which provides pin-programmable output voltages of +10.00V, +7.50V, +5.00V, and +2.50V. External components are not required for these outputs, but if other voltages are desired, they can be programmed with external resistors. Laser trimming minimizes output error as well as temperature drift, to as low as 10mV and 15ppm/C with the MX584K. The input voltage range of the MAX584 is 4.5V to 30V. The reference also includes a STROBE input which shuts down the reference output. Typical current drain when ON is 750A. This drops to about 100A when the reference is strobed OFF. The MX584 is designed for use with 8- to 14-bit A/D and D/A converters as well as data acquisition systems. It is available in 8-lead TO-99 metal cans, plastic DIPS, CERDIPS, and SO packages. 10mV Tolerance at +10V (MX584K) Low Tempco: 15ppm/C, max (MAX584K) No External Components or Trims Short-Circuit Proof Output Sources and Sinks Current 10mA Output Current
Features
+10.0V, +7.5V, +5.0V, +2.5V Programmable Outputs
MX584
Ordering Information
PART MX584JH MX584KH MX584JN MX584KN MX584JCSA MX584KCSA MX584JESA MX584KESA MX584JC/D MX584SH MX584TH MX584SQ MX584TQ TEMP RANGE 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C 0C to +70C -55C to +125C -55C to +125C -55C to +125C -55C to +125C PIN-PACKAGE ERROR 8 TO-99 Can 8 TO-99 Can 8 PDIP 8 PDIP 8 SO 8 SO 8 SO 8 SO 8 Dice 8 TO-99 Can 8 TO-99 Can 8 CERDIP 8 CERDIP 30mV 10mV 30mV 10mV 30mV 10mV 30mV 10mV 30mV 30mV 10mV 30mV 10mV
Applications
CMOS DAC Reference A/D Converter Reference Measurement Instrumentation Data Loggers Precision Analog Systems Programmable Offset for PGAs
Pin Configuration
TOP VIEW
10.0V 1 5.0V 2 8 +VS 7 CAP
Typical Operating Circuit
MX584
2.5V 3 COMMON 4 6 VBG 5 STROBE
8 +VS 10V 0.01F MX584 5V COMMON 2 1 RFB OUT1 MX7533 VREF -5V OUT2 GND MAX400
VOUT 0 TO 5V
8-Lead DIP
TAB 8 10.0V 1 7 CAP
4
5.0V 2 2.5V 3
MX584
6 VBG 5 STROBE
2.4k
4 COMMON
-15V
-5V REFERENCE FOR CMOS DAC
TO-39
________________________________________________________________ Maxim Integrated Products
1
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Pin-Programmable, Precision Voltage Reference MX584
ABSOLUTE MAXIMUM RATINGS
Input Voltage (VIN to COMMON)...............................-0.3V, +40V Continuous Power Dissipation Metal Can (derate 6.7mW/C above +60C) ................600mW CERDIP (derate 8mW/C above +75C) .......................600mW Plastic DIP (derate 6mW/C above +75C) ..................450mW SO (derate 5.3mW/C above +75C) ...........................400mW Output Short-Circuit Duration (Note 1) ..........................Indefinite Operating Temperature Range Commercial (J, K) ................................................0C to +70C Military (S, T) ...................................................-55C to +125C Extended (J, K) .................................................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C Die Junction Temperature (TJ) ..........................-55C to +150C Thermal Resistance, Junction to Ambient Metal Can..................................................................+150C/W CERDIP .....................................................................+125C/W Plastic DIP.................................................................+160C/W SO .............................................................................+170C/W
Note 1: 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 SYMBOL CONDITIONS VOUT = +10V, MAX584J/S MAX584K/T VOUT = +7.5V, MAX584J/S MAX584K/T VOUT = +5.0V, MAX584J/S MAX584K/T VOUT = +2.5V, MAX584J/S MAX584K/T MX584J/S, all outputs MX584K, all outputs Output Voltage Temperature Coefficient MX584KE, all outputs MX584JE, all outputs MX584T, +10V, +7.5V, +5V out +2.5V out Differential Tempco Between Outputs Quiescent Supply Current Quiescent Current Tempco Turn-On Settling Time Noise Long-Term Stability Short-Circuit Current Line Regulation ISC No load (VOUT + 2.5V) < VIN < +15V +15V < VIN < +30V tON en(P-P) To 1% 0.1Hz to 10Hz Noncumulative IQ MX584K/T MX584J/S IL = 0mA 3 5 750 1.5 200 50 25 30 0.005 0.002 1000 MIN TYP MAX 30 10 22 8 15 6 7.5 3.5 30 15 20 30 15 20 ppm/C A A/C s VP-P ppm/khrs mA %/V ppm/C mV UNITS
Output Voltage Tolerance
IL = 0mA, at Pin 1
2
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Pin-Programmable, Precision Voltage Reference
ELECTRICAL CHARACTERISTICS (continued)
(VIN = +15V, TA = +25C, unless otherwise noted.)
PARAMETER Load Regulation Source Output Current Sink (Note 2) IL VIN > VOUT + 2.5V SYMBOL CONDITIONS IL = 0mA to 5mA TA = +25C TMIN to TMAX TMIN to TMAX MX584J/K MX584S/T 10 5 5 0.2 5 mA MIN TYP 30 MAX UNITS ppm/mA
MX584
TA = -55C to +85C MX584S/T
Note 2: CLOAD 10nF. See the Output Current section.
Typical Operating Characteristics
(TA = +25C, unless otherwise noted.)
TYPICAL TEMPERATURE CHARACTERISTICS
MX584 toc01
SPECTRAL NOISE DENSITY AND RMS NOISE vs. FREQUENCY
NOISE SPECTRAL DENSITY (mV/Hz) NO CAP 0.01F 100 1000pF 100pF
MX584 toc02
OUTPUT VOLTAGE vs. SINK AND SOURCE CURRENT
14 OUTPUT VOLTAGE (V) 12 10 8 6 4 2 +VS = +15V TA = +25C
MX584 toc03
10.005
1000
VOUT (V)
10.000 10
NO CAP TOTAL NOISE RMS UP TO SPECIFIED FREQUENCY
9.995 -55 0 25 TEMPERATURE (C) 70 125
1 10 100 1k 10k 100k 1M FREQUENCY (Hz)
0 -20 -15 -10 -5 0 5 10 15 20 SINK SOURCE OUTPUT CURRENT (mA)
POWER-ON SETTLING CHARACTERISTICS
12 OUTPUT (V)
MX584 toc04
10.030 OUTPUT (V) 11 10.020 10.010 10 20 10 0 0 50 100 150 200 250 10.000
POWER-SUPPLY INPUT (V)
SETTLING TIME (s)
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Pin-Programmable, Precision Voltage Reference MX584
Detailed Description
As shown in Figure 1, most applications of the MX584 require no external components. Connections to +VS and COMMON (COMMON is also tied to the case in the TO-99 metal package) with all other pins unconnected result in a buffered +10.00V output at pin 1. The other pretrimmed voltages are obtained by strapping pins as shown in Table 1. If one or more external buffer amplifiers are connected to the programming pins (pins 2, 3), multiple outputs can be obtained from one reference.
Table 1. Programming Pin Connections
OUTPUT VOLTAGE (V) 10 7.5 5.0 2.5 PROGRAMMING (OUTPUT ON PIN 1) Pins 2 and 3 are unconnected Connect pins 2 and 3 together Connect pins 2 and 1 together Connect pins 3 and 1 together
Other Output Voltages
The MX584 can be adjusted to a different output voltage by adding one or more resistors as in Figure 2. As the diagram shows, the reference can be thought of as a 1.215V bandgap followed by a noninverting amplifier. If R1 and R2 are used alone, the adjustment range is widest but the resolution of the trim may be too coarse, even when a multi-turn trip pot is used. When adding external resistors, output voltages well above 10V can be obtained. R2 should therefore be chosen carefully since it sets the maximum output voltage. R2's resistance should not be so low as to jeopardize other circuits if R1 is misadjusted. The fixed output voltages can also be varied by connecting only one resistor, as in the dashed lines in Figure 2. Connecting R3 alone raises VOUT while R4 alone lowers it. These resistors (or potentiometers) must have very low temperature coefficients if accuracy over temperature is to be unaffected by the adjustment. If fine adjustment of the output is all that is required, the circuit of Figure 3 is recommended. It provides good stability and resolution for a trim range of 200mV. If the 2.5V output is adjusted, R2 should be connected to VBG, pin 6, and the trim range should be limited to 100mV.
+1.215V
+(VOUT + 2.5V) TO +30V 8 +VS 10.0V MX584 5.0V 2.5V 4 1 2 3 VOUT, +2.5V, +5.0V, +7.5V, +10V
Figure 1. Basic Connection for Positive Outputs
VSUPPLY 8 +VS MX584 10V 1 VOUT
5V 2 8k 2.5V 3 +2.5V* 4k VBG 5
R4
Voltage Temperature Coefficient
The temperature characteristic of the MX584 consistently follows an "S-curve" as shown in the 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 tolerance specifications in the Electrical Characteristics table state the maximum deviation from the reference's initial value at +25C. By adding the maximum deviation for a given device to its initial tolerance, the total possible error is determined.
R1
R3
R2
4k COM 4
*THE 2.5V TAP (PIN 3) IS USED INTERNALLY AS A BIAS POINT AND SHOULD NOT BE CHANGED BY MORE THAN 100mV IN ANY TRIM CONFIGURATION.
Figure 2. Variable Output Options
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Pin-Programmable, Precision Voltage Reference MX584
VSUPPLY 8 +VS 10.0V MX584 5.0V 2.5V VBG COM 4
VOUT + 10V AT 4A 2N6040 4 8 VIN 15V 470
1 2 3 6 R2 300k R1 10k
VOUT
COM MX584 VOUT 1
+VS
C1 0.1F
Figure 3. Fine Adjustment of Output Voltage (200mV)
Figure 6. High-Current Precision Supply
VSUPPLY
8 7 0.01F TO 0.1F 6 VBG COM 4 +VS CAP MX584 10.0V 5.0V 2.5V 1 2 VOUT
8 +VS 10V MX584 1 DARLINGTON NPN 2N8057
3
5V
2
2.5V COM
3 VOUT = +10V 1k
*INCREASES COLD START TURN-ON TIME.
4
Figure 4. Additional Noise Filtering with an External Capacitor
VSUPPLY 8 +VS 10V 5V 2.5V COM 4 1 2 3 VOUT
Figure 7. NPN Output Current Booster
8 +VS 10.0V 1
5 100*
MX584 STRB
MX584
2.5V
3
I R
2.5V + 0.75mA R
LOGIC INPUT (HIGH = OFF LOW = ON)
20k 2N2222 10k
COM 4
*SEE TEXT.
Figure 5. Use of Strobe Terminal
Figure 8. Precision Current Limiter 5
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Pin-Programmable, Precision Voltage Reference MX584
ANALOG GROUND 8 +VS 10V 0.01F 1 7.5V to 15V 8 +VS 10V MX584 5V COM 4
RS
1
5V 15 14 16 RFB 1 OUT1 VOUT MX7533 VREF 4-13 DIGITAL INPUT OUT2 2 GND 3 0 TO -5V MAX400
MX584 2
5V COM 4 VREF = -5V
2
5V 2.4k 5%
-7.5V TO -15V
-15V
Figure 9. Two-Terminal -5V Reference
Figure 10. Low-Power, 10-Bit CMOS DAC Connection
Output Current
The MX584 is capable of sinking as well as sourcing current. The circuit is also protected for output shorts to either +VS or ground (COMMON). The output's voltage versus current characteristic is shown in the Typical Operating Characteristics section. For applications that require the MX584 to sink current, maintain a load capacitance of 10nF or greater for proper operation.
-5V 1k 5% COM MX584 8 +VS 10V 1 2.5V 3 AIN INPUT 0 TO +2.5V 5 AGND DGND 18 4 -2.5VREF 0.01F 2 VREF BOFS MX7574 +5V 1 VDD DIGITAL DB0- 13-6 OUTPUTS DB7
Dynamic Performance
The turn-on settling performance of the MX584 is shown in the Typical Operating Characteristics. Both coarse and fine transient response is shown. The reference typically settles to 1mV (10V output) within 180s after power is applied.
Noise Filtering
The bandwidth of the MX584's output amplifier can be limited by connecting a capacitor between the CAP and VBG pins (see Figure 4). Typical values range from 0.01F to 0.1F. The reduction of wideband and feedthrough noise is plotted in a graph in the Typical Operating Characteristics section.
Figure 11. MX584 as Negative 2.5V Reference for a CMOS ADC
current flowing out of STROBE should be limited with 100 as shown in the dashed connection in Figure 5.
Applications Information
Precision High-Current Reference
A PNP power transistor, or Darlington, is easily connected to the MX584 to greatly increase its output current. The circuit in Figure 6 provides a +10V output at up to 4A. If the load has a significant capacitive component, C1 should be added. If the load is purely resistive, highfrequency supply rejection is improved without C1. An NPN output transistor or Darlington can also be used to boost output current as shown in Figure 7.
Strobe Input
The STROBE input, pin 5, zeroes the reference output when it is pulled LOW. If no current is pulled from STROBE, operation is normal. The threshold of the input is 200mV, so an open-drain n-channel FET or open-collector transistor driven from logic is recommended (see Figure 5). The current-sinking ability should be at least 500A and the leakage current should be 5A or less. While shut down, the MX584 should not be required to source or sink current unless a 0.7V residual output is acceptable. If the reference is required to sink transient current while shut down, the
6
Current Limiter
By adding a single resistor as shown in Figure 8, the MX584 is turned into a precision current limiter for
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Pin-Programmable, Precision Voltage Reference
applications where the driving voltage is 5V to 40V. The programmed current ranges from 0.75mA to 5mA.
MX584
Chip Topography
0.087" (2.209mm) CAP
Negative 10V Reference
In applications which require a -10V, -7.5V, -5.0V, or -2.5V reference, the MX584 can be connected as a two-terminal device and biased like a zener diode. The circuit is shown in Figure 9. +VS and VOUT are connected to the analog ground bus, and the MX584's COMMON 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. 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.
VBG
STROBE +VS 0.071" (1.803mm) 10.0V
5.0V
COMMON
Reference for DACs and ADCs
The MX584 is well suited for use with a wide variety of DACs, especially CMOS DACs. Figure 10 shows a circuit in which an MX7533 10-bit DAC outputs 0 to -5V when using a +5V reference. For a positive DAC output, the MX584 can be configured as a two-terminal negative reference as well by using the connection of Figure 9. In Figure 11, an MX7574 CMOS ADC uses an MX584, connected for -2.5V, as its reference input so that the system can operate from 5V power. The analog input range for the circuit is 0V to +2.5V.
2.5V COMMON
Chip Information
TRANSISTOR COUNT: 72 SUBSTRATE CONNECTED TO GND
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Pin-Programmable, Precision Voltage Reference MX584
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.)
8
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TO-99, 8LD .EPS
Pin-Programmable, Precision Voltage Reference
Package Information (continued)
(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.)
MX584
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PDIPN.EPS
9
Pin-Programmable, Precision Voltage Reference MX584
Package Information (continued)
(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.)
SOICN .EPS
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.
10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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