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19-1139; Rev 3; 5/98
Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage References
General Description
The MAX6225/MAX6241/MAX6250 are low-noise, precision voltage references with extremely low 1ppm/C temperature coefficients and excellent 0.02% initial accuracy. These devices feature buried-zener technology for lowest noise performance. Load-regulation specifications are guaranteed for source and sink currents up to 15mA. Excellent line and load regulation and low output impedance at high frequency make them ideal for high-resolution data-conversion systems up to 16 bits. The MAX6225 is set for 2.500V output, the MAX6241 is set for 4.096V output, and the MAX6250 is set for 5.000V output. All three provide for the option of external trimming and noise reduction.
____________________________Features
o Low 1.0ppm/C Temperature Coefficient o Very Low 1.5Vp-p Noise (0.1Hz to 10Hz) o 0.02% Initial Accuracy o 15mA Output Source and Sink Current o Low, 18mW Power Consumption (MAX6225) o Industry-Standard Pinout o Optional Noise Reduction and Voltage Trim o Excellent Transient Response o 8-Pin SO Package Available o Low 20ppm/1000h Long-Term Stability o Stable for All Capacitive Loads
MAX6225/MAX6241/MAX6250
Applications
High-Resolution Analog-to-Digital and Digital-to-Analog Converters High-Accuracy Reference Standard High-Accuracy Industrial and Process Control Digital Voltmeters ATE Equipment Precision Current Sources
PART MAX6225ACPA MAX6225BCPA MAX6225ACSA MAX6225BCSA MAX6225AEPA MAX6225BEPA MAX6225AESA MAX6225BESA MAX6225AMJA MAX6225BMJA
Ordering Information
TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -55C to +125C -55C to +125C PINPACKAGE 8 Plastic DIP 8 Plastic DIP 8 SO 8 SO 8 Plastic DIP 8 Plastic DIP 8 SO 8 SO 8 CERDIP 8 CERDIP MAX TEMPCO (ppm/C) 2.0 5.0 2.0 5.0 3.0 7.0 3.0 7.0 5.0 8.0
Ordering Information continued at end of data sheet.
Typical Operating Circuit
8V TO 36V INPUT
Pin Configuration
TOP VIEW
IN OUT 2.2F *
REFERENCE OUT
I.C. 1 IN 2 NR 3
8
I.C. I.C. OUT TRIM
NR
MAX6225 MAX6241 MAX6250
GND
TRIM 2.2F * GND 4
MAX6225 MAX6241 MAX6250
7 6 5
DIP/SO
*OPTIONAL
I.C. = INTERNALLY CONNECTED; DO NOT USE
________________________________________________________________ Maxim Integrated Products
1
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Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage References MAX6225/MAX6241/MAX6250
ABSOLUTE MAXIMUM RATINGS
(Voltages Referenced to GND) IN..............................................................................-0.3V to +40V OUT, TRIM ...............................................................-0.3V to +12V NR ..............................................................................-0.3V to +6V OUT Short Circuit to GND Duration (VIN 12V)..........Continuous OUT Short Circuit to GND Duration (VIN 40V) ....................5sec OUT Short Circuit to IN Duration (VIN 12V) ..............Continuous Continuous Power Dissipation (TA = +70C) Plastic DIP (derate 9.09mW/C above +70C)................727mW SO (derate 5.88mW/C above +70C) ............................471mW CERDIP (derate 8.00mW/C above +70C) ....................640mW Operating Temperature Ranges MAX62_ _ _C_ A .....................................................0C to +70C MAX62_ _ _E_ A ..................................................-40C to +85C MAX62_ _ _MJA ................................................-55C to +125C Storage Temperature Range ..............................-65C to +150C Lead Temperature (soldering, 10sec)...............................+300C
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--MAX6225
(VIN = 10V, IOUT = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Input Voltage Range Output Voltage SYMBOL VIN VOUT MAX6225A MAX6225B MAX6225AC_A MAX6225AE_A Output Voltage Temperature Coefficient (Note 1) TCVOUT MAX6225AMJA MAX6225BC_A MAX6225BE_A MAX6225BMJA CONDITIONS TA C, E, M +25C +25C C E M C E M +25C 8V VIN 10V Line Regulation (Note 2) VOUT / VIN 10V VIN 36V C E M +25C C E M 2 MIN 8 2.499 2.497 2.500 2.500 1.0 1.5 2.0 2.5 2.5 2.5 10 TYP MAX 36 2.501 2.503 2.0 3.0 5.0 5.0 7.0 8.0 18 30 35 45 5 7 8 10 ppm/V ppm/C UNITS V V
2
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Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage References
ELECTRICAL CHARACTERISTICS--MAX6225 (continued)
(VIN = 10V, IOUT = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL CONDITIONS Sourcing: 0mA IOUT 15mA Load Regulation (Note 2) VOUT/ IOUT TA C E M Sinking: -15mA IOUT 0mA Sinking: -15mA IOUT 0mA C E M Supply Current Trim-Adjustment Range Turn-On Settling Time Output Noise Voltage (Note 3) Temperature Hysteresis Long-Term Stability VOUT / t IIN VOUT tON en Figure 1 To 0.01% of final value 0.1Hz f 10Hz 10Hz f 1kHz (Note 4) +25C C, E, M C, E, M +25C +25C +25C +25C +25C 15 25 5 1.5 1.3 20 20 2.8 MIN TYP 1 1 3 1 1 10 1.8 MAX 6 7 15 6 7 30 2.7 3.0 mA mV s Vp-p VRMS ppm ppm/ 1000h ppm/mA UNITS
MAX6225/MAX6241/MAX6250
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Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage References MAX6225/MAX6241/MAX6250
ELECTRICAL CHARACTERISTICS--MAX6241
(VIN = 10V, IOUT = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Input Voltage Range Output Voltage SYMBOL VIN VOUT MAX6241A MAX6241B MAX6241AC_A MAX6241AE_A Output Voltage Temperature Coefficient (Note 1) TCVOUT MAX6241AMJA MAX6241BC_A MAX6241BE_A MAX6241BMJA CONDITIONS TA C, E, M +25C +25C C E M C E M +25C 8V VIN 10V Line Regulation (Note 2) VOUT / VIN 10V VIN 36V C E M +25C C E M C Sourcing: 0mA IOUT 15mA Load Regulation (Note 2) VOUT / IOUT Sinking: -15mA IOUT 0mA E M C E M Supply Current Trim-Adjustment Range Turn-On Settling Time Output Noise Voltage (Note 3) Temperature Hysteresis Long-Term Stability VOUT / t IIN VOUT tON en Figure 1 To 0.01% of final value 0.1Hz f 10Hz 10Hz f 1kHz (Note 4) +25C C, E, M C, E, M +25C +25C +25C +25C +25C 24 40 8 2.4 2.0 20 20 4.0 1 1 3 1 1 7 1.9 2 MIN 8 4.095 4.092 4.096 4.096 1.0 1.5 2.0 2.5 2.5 2.5 10 TYP MAX 36 4.097 4.100 2.0 3.0 5.0 5.0 7.0 8.0 18 30 35 45 5 7 8 10 6 7 9 6 7 18 2.9 3.2 mA mV s Vp-p VRMS ppm ppm/ 1000h ppm/mA ppm/mA ppm/V ppm/C UNITS V V
4
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Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage References
ELECTRICAL CHARACTERISTICS--MAX6250
(VIN = 10V, IOUT = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Input Voltage Range Output Voltage SYMBOL VIN VOUT MAX6250A MAX6250B MAX6250AC_A MAX6250AE_A Output Voltage Temperature Coefficient (Note 1) TCVOUT MAX6250AMJA MAX6250BC_A MAX6250BE_A MAX6250BMJA CONDITIONS TA C, E, M +25C +25C C E M C E M +25C 8V VIN 10V Line Regulation (Note 2) VOUT / VIN 10V VIN 36V C E M +25C C E M C Sourcing: 0mA IOUT 15mA Load Regulation (Note 2) VOUT / IOUT Sinking: -15mA IOUT 0mA E M C E M Supply Current Trim-Adjustment Range Turn-On Settling Time Output Noise Voltage (Note 3) Temperature Hysteresis Long-Term Stability VOUT / t IIN VOUT ton en Figure 1 To 0.01% of final value 0.1Hz f 10Hz 10Hz f 1kHz (Note 4) +25C C, E, M C, E, M +25C +25C +25C +25C +25C 30 50 10 3.0 2.5 20 20 5.0 1 1 2 1 1 6 2.0 2 MIN 8 4.999 4.995 5.000 5.000 1.0 1.5 2.0 2.5 2.5 2.5 10 TYP MAX 36 5.001 5.005 2.0 3.0 5.0 5.0 7.0 8.0 18 30 35 45 5 7 8 10 6 7 9 6 7 15 3.0 3.3 mA mV s Vp-p VRMS ppm ppm/ 1000h ppm/mA ppm/V ppm/C UNITS V V
MAX6225/MAX6241/MAX6250
Note 1: Note 2: Note 3: Note 4:
Temperature coefficient is measured by the box method; i.e., the maximum VOUT is divided by T x VOUT. Line regulation (VOUT / (VOUT x VIN)) and load regulation (VOUT / (VOUT x IOUT)) are measured with pulses and do not include output voltage changes due to die-temperature changes. Noise specifications are 100% tested for the 10Hz to 1kHz bandwidth. Contact factory for 100% noise testing in the 0.1Hz to 10Hz bandwidth. Temperature hysteresis is specified at TA = +25C by measuring VOUT before and after changing temperature by +25C using the PDIP package.
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Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage References MAX6225/MAX6241/MAX6250
__________________________________________Typical Operating Characteristics
(VIN = 10V, IOUT = 0mA, TA = +25C, unless otherwise noted.)
MAX6250 NORMALIZED OUTPUT VOLTAGE vs. TEMPERATURE
2.0 1.5 1.0 VOUT (mV) 0.5 0 -0.5 -1.0 -1.5 -55 -35 -15
MAX6225 -01
MAX6241 NORMALIZED OUTPUT VOLTAGE vs. TEMPERATURE
400 300 200 VOUT (ppm) VOUT (ppm) VOUT (mV) 100 0 -100 -0.5 -200 -125 0.5 125 VOUT (mV) 1.5
MAX6225 -02
MAX6225 NORMALIZED OUTPUT VOLTAGE vs. TEMPERATURE
375 250 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -55 -35 -15
MAX6225 03
280 240 200 160 80 40 0 -40 -80 -120 VOUT (ppm) 120
1.0
0
0
5
25
45
65
-300 85 105 125
-1 -55 -35 -15
5
25
45
65
-250 85 105 125
5
25
45
65
-160 85 105 125
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
MAX6250 CHANGE IN OUTPUT VOLTAGE vs. OUTPUT CURRENT
MAX6225-07
MAX6241 CHANGE IN OUTPUT VOLTAGE vs. OUTPUT CURRENT
MAX6225-06
MAX6225 CHANGE IN OUTPUT VOLTAGE vs. OUTPUT CURRENT
150 100 50
MAX6225-05
300 200 100 VOUT (V) 0 -100 -200 -300 -400 -40 -30 -20 -10 0 10 20 30 TA = +25C TA = -40C TA = +85C
300 200 100 VOUT (V) 0 -100 TA = -40C -200 -300 TA = +85C
200
TA = +25C
VOUT (V)
0 -50 -100 -150 -200 -250
TA = -40C
TA = +25C
TA = +85C
40
-40 -30 -20
-10
0
10
20
30
40
-40 -30 -20
-10
0
10
20
30
40
IOUT (mA)
IOUT (mA)
IOUT (mA)
CHANGE IN OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX6225-04
SUPPLY CURRENT vs. SUPPLY VOLTAGE
2.8 2.6 SUPPLY CURRENT (mA) MAX6250 MAX6225 MAX6241
MAX6225-08
SUPPLY CURRENT vs. TEMPERATURE
MAX6225-09
60 50 40 VOUT (ppm) 30 20 10 0 -10 -20 0 5 10 15 20 VIN (V) 25 30 35
3.0
3.5
3.0 SUPPLY CURRENT (mA)
2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0
2.5 MAX6241 2.0
MAX6250
1.5 MAX6225 1.0 0 5 10 15 20 25 30 35 40 -55 -35 -15 5 25 45 65 85 105 125 SUPPLY VOLTAGE (V) TEMPERATURE (C)
40
6
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Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage References
____________________________Typical Operating Characteristics (continued)
(VIN = 10V, IOUT = 0mA, TA = +25C, unless otherwise noted.)
MAX6225/MAX6241/MAX6250
MAX6225 OUTPUT NOISE-VOLTAGE DENSITY vs. FREQUENCY
MAX6225-10
MAX6241 OUTPUT NOISE-VOLTAGE DENSITY vs. FREQUENCY
MAX6225-11
MAX6250 OUTPUT NOISE-VOLTAGE DENSITY vs. FREQUENCY
90 OUTPUT NOISE DENSITY (nV/ Hz) 80 70 60 50 40 30 20 10 0 CNR = 1F CNR = 0F
MAX6225-12
50 OUTPUT NOISE DENSITY (nV/ Hz) 45 40 35 30 25 20 15 10 5 0 10 100 1k CNR = 1F CNR = 0F
90 80 OUTPUT NOISE DENSITY (nV/ Hz) 70 60 50 40 30 20 10 0 CNR = 1F CNR = 0F
100
10k
10
100
1k
10k
10
100
1k
10k
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
MAX6225 0.1Hz to 10Hz NOISE
MAX6225-17
MAX6241 0.1Hz to 10Hz NOISE
MAX6225-16
MAX6250 0.1Hz to 10Hz NOISE
MAX6225-18
COUT = CNR = 0F
COUT = CNR = 0F
COUT = CNR = 0F
VOUT, 0.5V/div
VOUT, 1V/div
1sec/div
1sec/div
VOUT, 1V/div
1sec/div
OUTPUT IMPEDANCE vs. FREQUENCY
MAX6225-13
RIPPLE REJECTION vs. FREQUENCY (CNR = 1F)
MAX6225-14
RIPPLE REJECTION vs. FREQUENCY (CNR = 0F)
90 RIPPLE REJECTION (dB) 85 MAX6250 80 75 70 65 60 MAX6241 MAX6225
MAX6225-15
100
120 110 MAX6225
95
OUTPUT IMPEDANCE ()
RIPPLE REJECTION (dB)
10
100 90 MAX6250 80 70 MAX6241
1
0.1
ISINK = 5mA
0.01 10 100
ISOURCE = 5mA 1k 10k FREQUENCY (Hz) 100k 1M
60 10 100 1k 10k FREQUENCY (Hz)
10
100
1k
10k
FREQUENCY (Hz)
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Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage References MAX6225/MAX6241/MAX6250
____________________________Typical Operating Characteristics (continued)
(VIN = 10V, IOUT = 0mA, TA = +25C, unless otherwise noted.)
LOAD-TRANSIENT RESPONSE (SOURCING)
MAX6225-19
LOAD-TRANSIENT RESPONSE (SINKING)
MAX6225-20
0mA A -10mA A
10mA 0mA
B B
2s/div A: IOUT, 10mA/div (SOURCING) B: VOUT, 500V/div
2s/div A: IOUT, 10mA/div (SINKING) B: VOUT, 500V/div
LOAD-TRANSIENT RESPONSE
MAX6225-21
MAX6225 TURN-ON AND TURN-OFF TRANSIENT RESPONSE
MAX6225-26
A
-10mA +10mA
A
+10V 0V
B
B
VIN = 10V COUT = CNR = 0F 1s/div A: IOUT (10mA SOURCE AND SINK), 20mA/div, AC COUPLED B: VOUT, 20mV/div, AC COUPLED
CIN = COUT = CNR = 0F 1s/div A: B: VIN, 10V/div VOUT, 1V/div
MAX6241 TURN-ON AND TURN-OFF TRANSIENT RESPONSE
MAX6225-25
MAX6250 TURN-ON AND TURN-OFF TRANSIENT RESPONSE
MAX6225-27
A
+10V 0V
A
+10V 0V
B
B
CIN = COUT = CNR = 0F 1s/div A: VIN, 10V/div B: VOUT, 1V/div
CIN = COUT = CNR = 0F 1s/div A: VIN, 10V/div B: VOUT, 1V/div
8
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Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage References
_____________________Pin Description
PIN 1, 7, 8 2 NAME I.C. IN FUNCTION Internally Connected. Do not use. Positive Power-Supply Input Noise Reduction. Optional capacitor connection for wideband noise reduction. Leave open if not used (Figure 2). Ground External Trim Input. Allows 1% output adjustment (Figure 1). Leave open if not used. Voltage Reference Output
Noise Reduction
To augment wideband noise reduction, add a 1F capacitor to the NR pin (Figure 2). Larger values do not improve noise appreciably (see Typical Operating Characteristics). Noise in the power-supply input can affect output noise, but can be reduced by adding an optional bypass capacitor to the IN pin and GND.
MAX6225/MAX6241/MAX6250
3
NR
Bypassing
The MAX6225/MAX6241/MAX6250 are stable with capacitive load values from 0F to 100F, for all values of load current. Adding an output bypass capacitor can help reduce noise and output glitching caused by load transients.
4 5 6
GND TRIM OUT
Applications Information
Negative Regulator
Figure 3 shows how both a +5V and -5V precision reference can be obtained from a single unregulated +5V supply. A MAX681 generates approximately 9V to operate the MAX6250 reference and MAX432 inverting amplifier. The +5V is inverted by the MAX432 chopperstabilized amplifier. Resistor R1 is optional, and may be used to trim the 5V references. R2 and R4 should be matched, both in absolute resistance and temperature coefficient. R3 is optional, and is adjusted to set the -5V reference.
Detailed Description
Temperature Stability
The MAX6225/MAX6241/MAX6250 are highly stable, low-noise voltage references that use a low-power temperature-compensation scheme to achieve laboratorystandard temperature stability. This produces a nearly flat temperature curve, yet does not require the power associated with heated references. The output voltage can be trimmed a minimum of 0.6% by connecting a 10k potentiometer between OUT and GND, and connecting its tap to the TRIM pin, as shown in Figure 1. The external trimming does not affect temperature stability.
8V TO 36V INPUT
8V TO 36V INPUT
IN OUT
REFERENCE OUT * TRIM 10k 1F NR
IN OUT
REFERENCE OUT
NR
MAX6225 MAX6241 MAX6250
GND
MAX6225 MAX6241 MAX6250
GND
TRIM
*OPTIONAL
Figure 1. Output Voltage Adjustment
Figure 2. Noise-Reduction Capacitor
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9
Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage References MAX6225/MAX6241/MAX6250
+5V INPUT C1+ C1VCC V+ IN +REFERENCE OUT OUT R2 100k R1 10k C3 2.2F
3.3F
MAX865
3.3F C2+ C2GND VC1 2.2F NR GND C2 1F
MAX6250
TRIM
R3 1k C4 1F
MAX432
2.2F
R4 100k
-REFERENCE OUT
Figure 3. +5V and -5V References from a Single +5V Supply
Ordering Information (continued)
PART MAX6241ACPA MAX6241BCPA MAX6241ACSA MAX6241BCSA MAX6241AEPA MAX6241BEPA MAX6241AESA MAX6241BESA MAX6241AMJA MAX6241BMJA MAX6250ACPA MAX6250BCPA MAX6250ACSA MAX6250BCSA MAX6250AEPA MAX6250BEPA MAX6250AESA MAX6250BESA MAX6250AMJA MAX6250BMJA TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -55C to +125C -55C to +125C 0C to +70C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -55C to +125C -55C to +125C PINPACKAGE 8 Plastic DIP 8 Plastic DIP 8 SO 8 SO 8 Plastic DIP 8 Plastic DIP 8 SO 8 SO 8 CERDIP 8 CERDIP 8 Plastic DIP 8 Plastic DIP 8 SO 8 SO 8 Plastic DIP 8 Plastic DIP 8 SO 8 SO 8 CERDIP 8 CERDIP MAX TEMPCO (ppm/C) 2.0 5.0 2.0 5.0 3.0 7.0 3.0 7.0 5.0 8.0 2.0 5.0 2.0 5.0 3.0 7.0 3.0 7.0 5.0 8.0
___________________Chip Information
TRANSISTOR COUNT: 435
10
______________________________________________________________________________________
Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage References
________________________________________________________Package Information
SOICN.EPS
MAX6225/MAX6241/MAX6250
______________________________________________________________________________________
PDIPN.EPS
11
Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage References MAX6225/MAX6241/MAX6250
___________________________________________Package Information (continued)
CDIPS.EPS
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.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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