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19-1930; Rev 0; 4/01
Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage Reference MAX6220
General Description
The MAX6220 is a low-noise, precision voltage reference with extremely low 20ppm/C temperature coefficient over the automotive temperature range (-40C to +125C) and excellent 0.1% initial accuracy. This device features buried-zener technology for low noise performance. The load-regulation specification is guaranteed for source and sink currents up to 15mA. Excellent line and load regulation and low output impedance at high frequency make the MAX6220 ideal for high-resolution data-conversion systems up to 16 bits. The MAX6220 is set for 2.5V, 4.096V, and 5.0V outputs.
Features
o Low 20ppm/C Temperature Coefficient over -40C to +125C Range o Very Low 1.5Vp-p Noise (0.1Hz to 10Hz) o 0.1% Initial Accuracy o 15mA Output Source and Sink Current o 8V to 40V Input Voltage Range o Optional Noise Reduction and Voltage Trim o Excellent Transient Response o Low 20ppm/1000hr Long-Term Stability o Stable for All Capacitive Loads
Applications
High-Accuracy Industrial and Process Control ATE Equipment Precision Current Sources
Ordering Information
PART TEMP. RANGE OUPUT PINVOLTAGE PACKAGE (V) 8 SO 8 SO 8 SO 2.5 4.096 5.0
MAX6220ASA25 -40C to +125C MAX6220ASA41 -40C to +125C MAX6220ASA50 -40C to +125C
Typical Operating Circuit
8V TO 40V INPUT
Pin Configuration
TOP VIEW
IN OUT 2.2F *
REFERENCE OUT
I.C. 1 IN 2
8 7
I.C. I.C. OUT TRIM
NR
MAX6220
TRIM 2.2F *
NR 3 GND 4
MAX6220
6 5
GND
SOIC
*OPTIONAL (STABLE WITH ALL CAPACITIVE LOADS)
________________________________________________________________ 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.
Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage Reference MAX6220
ABSOLUTE MAXIMUM RATINGS
(Voltages Referenced to GND) IN..............................................................................-0.3V to +42V 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 42V) ........................5s OUT Short-Circuit to IN Duration (VIN 12V) ..............Continuous Continuous Power Dissipation (TA = +70C) 8-Pin SO (derate 5.9mW/C above +70C) ....................471mW Operating Temperature Range...........................-40C to +125C Storage Temperature Range ..............................-65C to +150C Lead Temperature (soldering, 10s)...................................+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--(+2.5V)
(VIN = +10V, IOUT = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER Input Voltage Range Output Voltage Output Voltage Temperature Coefficient (Note 1) Line Regulation (Note 2) SYMBOL VIN VOUT TCVOUT VOUT/ VIN VOUT/ IOUT 8V VIN 40V Sourcing: 0mA IOUT 15mA Sinking: -15mA IOUT 0mA +25C +25C +25C +25C (Figure 1) To 0.01% of final value 0.1Hz f 10Hz 10Hz f 1kHz (Note 4) VOUT t = 1000hr 15 +25C CONDITIONS TA MIN 8 2.497 2.500 2 2 1 1 1.8 25 5 1.5 1.3 20 20 2.8 TYP MAX 40 2.503 20 7 45 6 15 6 30 2.9 3.3 mA mV s Vp-p VRMS ppm ppm ppm/mA UNITS V V ppm/C ppm/V
Load Regulation (Note 2)
Supply Current Trim-Adjustment Range Turn-On Settling Time Output Noise Voltage (Note 3) Temperature Hysteresis Long-Term Stability
IIN VOUT tON eN
2
_______________________________________________________________________________________
Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage Reference
ELECTRICAL CHARACTERISTICS--(+4.096V)
(VIN = +10V, IOUT = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER Input Voltage Range Output Voltage Output VoltageTemperature Coefficient (Note 1) Line Regulation (Note 2) SYMBOL VIN VOUT TCVOUT VOUT/ VIN VOUT/ IOUT 8V VIN 40V Sourcing: 0mA IOUT 15mA Sinking: -15mA IOUT 0mA +25C +25C +25C +25C (Figure 1) To 0.01% of final value 0.1Hz f 10Hz 10Hz f 1kHz (Note 4) VOUT t = 1000hr 24 +25C CONDITIONS TA MIN 8 4.092 4.096 2 2 1 1 1.9 40 5 2.4 2.0 20 20 4.0 TYP MAX 40 4.100 20 7 45 6 15 6 30 3.1 3.5 mA mV s Vp-p VRMS ppm ppm ppm/mA UNITS V V ppm/C ppm/V
MAX6220
Load Regulation (Note 2)
Supply Current Trim-Adjustment Range Turn-On Settling Time Output Noise Voltage (Note 3) Temperature Hysteresis Long-Term Stability
IIN VOUT tON eN
_______________________________________________________________________________________
3
Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage Reference MAX6220
ELECTRICAL CHARACTERISTICS--(+5.0V)
(VIN = +10V, IOUT = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER Input Voltage Range Output Voltage Output Voltage Temperature Coefficient (Note 1) Line Regulation (Note 2) SYMBOL VIN VOUT TCVOUT VOUT/ VIN VOUT/ IOUT 8V VIN 40V Sourcing: 0mA IOUT 15mA Sinking: -15mA IOUT 0mA +25C +25C +25C +25C (Figure 1) To 0.01% of final value 0.1Hz f 10Hz 10Hz f 1kHz (Note 4) VOUT t = 1000hr 30 +25C CONDITIONS TA MIN 8 4.995 5.000 2 2 1 1 2.0 50 5 3.0 2.5 20 20 5.0 TYP MAX 40 5.005 20 7 45 6 15 6 30 3.3 3.7 mA mV s Vp-p VRMS ppm ppm ppm/mA UNITS V V ppm/C ppm/V
Load Regulation (Note 2)
Supply Current Trim-Adjustment Range Turn-On Settling Time Output Noise Voltage (Note 3) Temperature Hysteresis Long-Term Stability
IIN VOUT tON eN
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 guaranteed by design. Temperature hysteresis is specified at TA = +25C by measuring VOUT before and after changing temperature by +25C.
4
_______________________________________________________________________________________
Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage Reference
Typical Operating Characteristics
(VIN = +10V, IOUT = 0mA, TA = +25C, unless otherwise noted.)
MAX6220_50 NORMALIZED OUTPUT VOLTAGE vs. TEMPERATURE
2.0 1.5 1.0 VOUT (mV) 0.5 0
MAX6220 toc01
MAX6220
MAX6220_41 NORMALIZED OUTPUT VOLTAGE vs. TEMPERATURE
400 300 200 VOUT (ppm) VOUT (ppm) VOUT (mV) 100 0 -100 -0.5 -125 -200 0.5 125 VOUT (mV) 1.5
MAX6220 toc02
MAX6220_25 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
MAX6220 toc03
280 240 200 160 80 40 0 -40 -80 -120 VOUT (ppm) 120
1.0
0
0
-0.5 -1.0 -1.5 -55 -35 -15
5
25
45
65
-300 85 105 125
-1.0 -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)
MAX6220_50 CHANGE IN OUTPUT VOLTAGE vs. OUTPUT CURRENT
MAX6220 toc04
MAX6220_41 CHANGE IN OUTPUT VOLTAGE vs. OUTPUT CURRENT
MAX6220 toc05
MAX6220_25 CHANGE IN OUTPUT VOLTAGE vs. OUTPUT CURRENT
150 100
MAX6220 toc06
300 200 100 VOUT (V)
300 200 100 VOUT (V) TA = +85C
200
0 -100 -200 -300 -400
TA = -40C
TA = +85C
VOUT (V)
TA = +25C
50 0 -50 -100 TA = -40C TA = +25C
0 -100 TA = -40C
TA = +25C
-150 -200 TA = +85C
-200 -300 -250 -40 -30 -20 -10 0 10 20 30 40 -40 -30 -20 -10 0
-40 -30 -20
-10
0
10
20
30
40
10
20
30
40
IOUT (mA)
IOUT (mA)
IOUT (mA)
CHANGE IN OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX6220 toc07
SUPPLY CURRENT vs. SUPPLY VOLTAGE
2.8 2.6 SUPPLY CURRENT (mA) 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 1.0 0 5 10 15 20 25 30 35 40 MAX6220_25 MAX6220_50 MAX6220_41
MAX6220 toc08
SUPPLY CURRENT vs. TEMPERATURE
MAX6220 toc09
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)
2.5 MAX6220_41 2.0
MAX6220_50
1.5 MAX6220_25
40
-55 -35 -15
5
25 45
65
85 105 125
SUPPLY VOLTAGE (V)
TEMPERATURE (C)
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5
Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage Reference MAX6220
Typical Operating Characteristics (continued)
(VIN = +10V, IOUT = 0mA, TA = +25C, unless otherwise noted.)
MAX6220_25 OUTPUT NOISE-VOLTAGE DENSITY vs. FREQUENCY
MAX6220 toc10
MAX6220_41 OUTPUT NOISE-VOLTAGE DENSITY vs. FREQUENCY
MAX6220 toc11
MAX6220_50 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
MAX6220 toc12
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)
MAX6220_25 0.1Hz TO 10Hz NOISE
MAX6220 toc13
MAX6220_41 0.1Hz TO 10Hz NOISE
MAX6220 toc14
MAX6220_50 0.1Hz TO 10Hz NOISE
MAX6220 toc15
COUT = CNR = 0F
COUT = CNR = 0F
COUT = CNR = 0F
VOUT, 0.5V/div
VOUT, 1V/div
VOUT, 1V/div
1s/div
1s/div
1s/div
OUTPUT IMPEDANCE vs. FREQUENCY
MAX6220 toc16
RIPPLE REJECTION vs. FREQUENCY (CNR = 1F)
MAX6220 toc17
RIPPLE REJECTION vs. FREQUENCY (CNR = 0F)
90 RIPPLE REJECTION (dB) 85 MAX6220_50 80 75 70 65 60 MAX6220_41 MAX6220_25
MAX6220 toc18
100
120 110 RIPPLE REJECTION (dB) 100 90 MAX6220_50 80 70 MAX6220_41 MAX6220_25
95
OUTPUT IMPEDANCE ()
10
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)
6
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Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage Reference
Typical Operating Characteristics (continued)
(VIN = +10V, IOUT = 0mA, TA = +25C, unless otherwise noted.)
MAX6220_50 LOAD-TRANSIENT RESPONSE (SOURCING)
MAX6220 toc19
MAX6220
MAX6220_50 LOAD-TRANSIENT RESPONSE (SINKING)
MAX6220 toc20
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
MAX6220_50 LOAD-TRANSIENT RESPONSE
MAX6220 toc21
MAX6220_25 TURN-ON AND TURN-OFF TRANSIENT RESPONSE
MAX6220 toc22
A
+10mA -10mA
A
+10V 0
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: VIN, 10V/div B: VOUT, 1V/div
MAX6220_41 TURN-ON AND TURN-OFF TRANSIENT RESPONSE
MAX6220 toc22
MAX6220_50 TURN-ON AND TURN-OFF TRANSIENT RESPONSE
MAX6220 toc24
+10V A 0
A
+10V 0
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
_______________________________________________________________________________________
7
Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage Reference MAX6220
_____________________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.
3
NR
Bypassing
The MAX6220 is 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. The MAX865 generates approximately 9V to operate both the MAX6220 reference and the MAX480 inverting amplifier. The +5V is inverted by the MAX480. 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 MAX6220 is a highly stable, low-noise voltage reference that uses a low-power temperature-compensation scheme to achieve laboratory-standard 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 0.6% (min) by connecting a 10k potentiometer between OUT and GND, and connecting its tap to the TRIM pin (Figure 1). The external trimming does not affect temperature stability.
8V TO 40V INPUT
8V TO 40V INPUT
IN OUT
IN REFERENCE OUT 2.2F* TRIM 10k 1F NR GND OUT
REFERENCE OUT
MAX6220
NR GND
MAX6220
TRIM
*OPTIONAL
Figure 1. Output Voltage Adjustment
Figure 2. Noise-Reduction Capacitor
8
_______________________________________________________________________________________
Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage Reference MAX6220
+5V INPUT C1+ C1VCC V+ IN +REFERENCE OUT OUT R2 100k
3.3F
MAX865
3.3F C2+ C2GND VC1 2.2F NR GND C2 1F
MAX6220
TRIM R1 10k C3 2.2F R3 1k
MAX480
2.2F
R4 100k
-REFERENCE OUT
Figure 3. +5V and -5V References from a Single +5V Supply
Chip Information
TRANSISTOR COUNT: 435
_______________________________________________________________________________________
9
Low-Noise, Precision, +2.5V/+4.096V/+5V Voltage Reference MAX6220
________________________________________________________Package Information
SOICN.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.
10 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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