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 refer-
ence with extremely low 20ppm/°C temperature coeffi-
cient over the automotive temperature range (-40°C to
+125°C) and excellent ±0.1% initial accuracy. This
device features buried-zener technology for low noise
performance. The load-regulation specification is guar-
anteed 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
-40°C to +125°C Range
o
Very Low 1.5µVp-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
PIN-
VOLTAGE
PACKAGE
(V)
8 SO
8 SO
8 SO
2.5
4.096
5.0
MAX6220ASA25 -40°C to +125°C
MAX6220ASA41 -40°C to +125°C
MAX6220ASA50 -40°C to +125°C
Typical Operating Circuit
8V TO 40V INPUT
Pin Configuration
TOP VIEW
IN
OUT
2.2µF
*
REFERENCE OUT
I.C.
1
IN
2
8
7
I.C.
I.C.
OUT
TRIM
NR
MAX6220
TRIM
2.2µF
*
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 (V
IN
≤
12V)..........Continuous
OUT Short-Circuit to GND Duration (V
IN
≤
42V) ........................5s
OUT Short-Circuit to IN Duration (V
IN
≤
12V) ..............Continuous
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 5.9mW/°C above +70°C) ....................471mW
Operating Temperature Range...........................-40°C to +125°C
Storage Temperature Range ..............................-65°C to +150°C
Lead Temperature (soldering, 10s)...................................+300°C
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)
(V
IN
= +10V, I
OUT
= 0mA, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Input Voltage Range
Output Voltage
Output Voltage Temperature
Coefficient (Note 1)
Line Regulation (Note 2)
SYMBOL
V
IN
V
OUT
TCV
OUT
∆V
OUT
/
∆V
IN
∆V
OUT
/
∆I
OUT
8V
≤
V
IN
≥
40V
Sourcing: 0mA
≤
I
OUT
≤
15mA
Sinking: -15mA
≤
I
OUT
≤
0mA
+25°C
+25°C
+25°C
+25°C
(Figure 1)
To ±0.01% of final value
0.1Hz
≤
f
≥
10Hz
10Hz
≤
f
≥
1kHz
(Note 4)
∆V
OUT
∆t
= 1000hr
±15
+25°C
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
µs
µVp-p
µV
RMS
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
I
IN
∆V
OUT
t
ON
e
N
2
_______________________________________________________________________________________
Low-Noise, Precision, +2.5V/+4.096V/+5V
Voltage Reference
ELECTRICAL CHARACTERISTICS—(+4.096V)
(V
IN
= +10V, I
OUT
= 0mA, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Input Voltage Range
Output Voltage
Output VoltageTemperature
Coefficient (Note 1)
Line Regulation (Note 2)
SYMBOL
V
IN
V
OUT
TCV
OUT
∆V
OUT
/
∆V
IN
∆V
OUT
/
∆I
OUT
8V
≤
V
IN
≥
40V
Sourcing: 0mA
≤
I
OUT
≤
15mA
Sinking: -15mA
≤
I
OUT
≤
0mA
+25°C
+25°C
+25°C
+25°C
(Figure 1)
To ±0.01% of final value
0.1Hz
≤
f
≥
10Hz
10Hz
≤
f
≥
1kHz
(Note 4)
∆V
OUT
∆t
= 1000hr
±24
+25°C
CONDITIONS
T
A
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
µs
µVp-p
µV
RMS
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
I
IN
∆V
OUT
t
ON
e
N
_______________________________________________________________________________________
3
Low-Noise, Precision, +2.5V/+4.096V/+5V
Voltage Reference
MAX6220
ELECTRICAL CHARACTERISTICS—(+5.0V)
(V
IN
= +10V, I
OUT
= 0mA, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Input Voltage Range
Output Voltage
Output Voltage Temperature
Coefficient (Note 1)
Line Regulation (Note 2)
SYMBOL
V
IN
V
OUT
TCV
OUT
∆V
OUT
/
∆V
IN
∆V
OUT
/
∆I
OUT
8V
≤
V
IN
≥
40V
Sourcing: 0mA
≤
I
OUT
≤
15mA
Sinking: -15mA
≤
I
OUT
≤
0mA
+25°C
+25°C
+25°C
+25°C
(Figure 1)
To ±0.01% of final value
0.1Hz
≤
f
≥
10Hz
10Hz
≤
f
≥
1kHz
(Note 4)
∆V
OUT
∆t
= 1000hr
±30
+25°C
CONDITIONS
T
A
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
µs
µVp-p
µV
RMS
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
I
IN
∆V
OUT
t
ON
e
N
Note 1:
Note 2:
Note 3:
Note 4:
Temperature coefficient is measured by the box method; i.e., the maximum
∆V
OUT
is divided by
∆T
x V
OUT
.
Line regulation (∆V
OUT
/ (V
OUT
x
∆V
IN
)) and load regulation (∆V
OUT
/ (V
OUT
x
∆I
OUT
)) 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 T
A
= +25°C by measuring V
OUT
before and after changing temperature by +25°C.
4
_______________________________________________________________________________________
Low-Noise, Precision, +2.5V/+4.096V/+5V
Voltage Reference
Typical Operating Characteristics
(V
IN
= +10V, I
OUT
= 0mA, T
A
= +25°C, unless otherwise noted.)
MAX6220_50
NORMALIZED OUTPUT VOLTAGE
vs. TEMPERATURE
2.0
1.5
1.0
∆V
OUT
(mV)
0.5
0
MAX6220 toc01
MAX6220
MAX6220_41
NORMALIZED OUTPUT VOLTAGE
vs. TEMPERATURE
400
300
200
∆V
OUT
(ppm)
∆V
OUT
(ppm)
∆V
OUT
(mV)
100
0
-100
-0.5
-125
-200
0.5
125
∆V
OUT
(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
∆V
OUT
(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
∆V
OUT
(µV)
300
200
100
∆V
OUT
(µV)
T
A
= +85°C
200
0
-100
-200
-300
-400
T
A
= -40°C
T
A
= +85°C
∆V
OUT
(µV)
T
A
= +25°C
50
0
-50
-100
T
A
= -40°C
T
A
= +25°C
0
-100
T
A
= -40°C
T
A
= +25°C
-150
-200
T
A
= +85°C
-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
I
OUT
(mA)
I
OUT
(mA)
I
OUT
(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
∆V
OUT
(ppm)
30
20
10
0
-10
-20
0
5
10
15
20
V
IN
(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)
_______________________________________________________________________________________
5
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