General Description
The MAX6225/MAX6241/MAX6250 are low-noise, preci-
sion voltage references with extremely low 1ppm/C
temperature coefficients and excellent 0.02% initial
accuracy. These devices feature buried-zener technolo-
gy for lowest noise performance. Load-regulation speci-
fications 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 exter-
nal trimming and noise reduction.
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
____________________________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
Low-Noise, Precision, +2.5V/+4.096V/+5V
Voltage References
________________________________________________________________
Maxim Integrated Products
1
REFERENCE OUT
GND
NR
*OPTIONAL
TRIM
OUT
IN
8V TO 36V INPUT
*
2.2
F
*
2.2
F
MAX6225
MAX6241
MAX6250
Typical Operating Circuit
OUT
NR
TRIM
GND
1
2
8
7
I.C.
I.C.
IN
I.C.
MAX6225
MAX6241
MAX6250
DIP/SO
TOP VIEW
I.C. = INTERNALLY CONNECTED; DO NOT USE
3
4
6
5
Pin Configuration
19-1139; Rev 3; 5/98
Ordering Information
Ordering Information continued at end of data sheet.
MAX6225BCSA
MAX6225
ACPA
MAX6225BCPA
MAX6225ACSA
0C to +70C
0C to +70C
0C to +70C
0C to +70C
5.0
2.0
5.0
2.0
8 SO
8 Plastic DIP
8 Plastic DIP
8 SO
MAX6225AEPA
-40C to +85C
3.0
8 Plastic DIP
PART
TEMP. RANGE
MAX
TEMPCO
(ppm/
C)
PIN-
PACKAGE
MAX6225BEPA
-40C to +85C
7.0
8 Plastic DIP
MAX6225AESA
-40C to +85C
3.0
8 SO
MAX6225BESA
-40C to +85C
7.0
8 SO
MAX6225AMJA
-55C to +125C
5.0
8 CERDIP
MAX6225BMJA
-55C to +125C
8.0
8 CERDIP
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
MAX6225/MAX6241/MAX6250
Low-Noise, Precision, +2.5V/+4.096V/+5V
Voltage References
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS--MAX6225
(V
IN
= 10V, I
OUT
= 0mA, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.)
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.
(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 (V
IN
12V)..........Continuous
OUT Short Circuit to GND Duration (V
IN
40V) ....................5sec
OUT Short Circuit to IN Duration (V
IN
12V) ..............Continuous
Continuous Power Dissipation (T
A
= +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
V
8
36
V
IN
Input Voltage Range
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
C, E, M
T
A
V
2.499
2.500
2.501
V
OUT
Output Voltage
C
1.0
2.0
Output Voltage Temperature
Coefficient (Note 1)
TCV
OUT
E
1.5
3.0
ppm/C
Line Regulation (Note 2)
V
OUT
/
V
IN
+25C
10
18
ppm/V
MAX6225A
MAX6225AC_A
MAX6225AE_A
CONDITIONS
8V
V
IN
10V
2.497
2.500
2.503
MAX6225B
M
2.0
5.0
C
2.5
5.0
MAX6225AMJA
MAX6225BC_A
E
2.5
7.0
M
2.5
8.0
MAX6225BE_A
MAX6225BMJA
C
30
E
35
M
45
10V
V
IN
36V
+25C
2
5
C
7
E
8
M
10
+25C
+25C
Sinking: -15mA
I
OUT
0mA
MAX6225/MAX6241/MAX6250
Low-Noise, Precision, +2.5V/+4.096V/+5V
Voltage References
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS--MAX6225 (continued)
(V
IN
= 10V, I
OUT
= 0mA, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.)
(Note 4)
20
ppm
Temperature Hysteresis
+25C
CONDITIONS
C
1
6
E
Long-Term Stability
V
OUT
/ t
1
7
+25C
20
M
3
15
ppm/
1000h
C
1
6
Figure 1
0.1Hz
f
10Hz
E
10Hz
f
1kHz
1
7
M
10
30
+25C
1.8
2.7
Supply Current
I
IN
C, E, M
3.0
mA
Trim-Adjustment Range
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
V
OUT
C, E, M
15
25
mV
1.5
V
p-p
Output Noise Voltage (Note 3)
e
n
+25C
1.3
2.8
V
RMS
T
A
To 0.01% of final value
Turn-On Settling Time
t
ON
+25C
5
s
+25C
Sourcing: 0mA
I
OUT
15mA
ppm/mA
V
OUT
/
I
OUT
Load Regulation (Note 2)
Sinking: -15mA
I
OUT
0mA
ppm/mA
MAX6225/MAX6241/MAX6250
Low-Noise, Precision, +2.5V/+4.096V/+5V
Voltage References
4
_______________________________________________________________________________________
(Note 4)
V
4.095
4.096
4.097
V
OUT
Output Voltage
+25C
20
ppm
Temperature Hysteresis
C
1.0
2.0
MAX6241A
Output Voltage Temperature
Coefficient (Note 1)
TCV
OUT
E
1.5
3.0
ppm/C
+25C
+25C
10
18
MAX6241AC_A
MAX6241AE_A
CONDITIONS
20
ppm/
1000h
8V
V
IN
10V
Long-Term Stability
V
OUT
/ t
+25C
Line Regulation (Note 2)
V
OUT
/
V
IN
ppm/V
Figure 1
0.1Hz
f
10Hz
10Hz
f
1kHz
V
8
36
V
IN
Input Voltage Range
+25C
1.9
2.9
I
IN
C, E, M
3.2
mA
Trim-Adjustment Range
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
V
OUT
C, E, M
24
40
mV
2.4
Vp-p
Output Noise Voltage (Note 3)
e
n
+25C
2.0
4.0
V
RMS
C, E, M
T
A
ELECTRICAL CHARACTERISTICS--MAX6241
(V
IN
= 10V, I
OUT
= 0mA, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.)
M
2.0
5.0
C
2.5
5.0
MAX6241AMJA
MAX6241BC_A
E
2.5
7.0
M
2.5
8.0
MAX6241BE_A
MAX6241BMJA
4.092
4.096
4.100
MAX6241B
To 0.01% of final value
Turn-On Settling Time
t
ON
+25C
8
s
C
30
E
35
M
45
+25C
2
5
10V
V
IN
36V
C
7
E
8
M
10
Supply Current
C
1
6
E
1
7
M
3
9
C
1
6
E
1
7
M
7
18
+25C
+25C
Sourcing: 0mA
I
OUT
15mA
Sinking: -15mA
I
OUT
0mA
V
OUT
/
I
OUT
Load Regulation (Note 2)
ppm/mA
MAX6225/MAX6241/MAX6250
Low-Noise, Precision, +2.5V/+4.096V/+5V
Voltage References
_______________________________________________________________________________________
5
ELECTRICAL CHARACTERISTICS--MAX6250
(V
IN
= 10V, I
OUT
= 0mA, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.)
(Note 4)
V
4.999
5.000
5.001
V
OUT
Output Voltage
+25C
20
ppm
Temperature Hysteresis
C
1.0
2.0
MAX6250A
E
1.5
3.0
+25C
+25C
10
18
MAX6250AC_A
MAX6250AE_A
CONDITIONS
20
ppm/
1000h
8V
V
IN
10V
Long-Term Stability
V
OUT
/ t
+25C
Line Regulation (Note 2)
V
OUT
/
V
IN
ppm/V
Figure 1
To 0.01% of final value
V
8
36
V
IN
Input Voltage Range
+25C
2.0
3.0
Supply Current
I
IN
C, E, M
3.3
mA
Trim-Adjustment Range
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
V
OUT
C, E, M
30
50
mV
10
s
Turn-On Settling Time
t
on
+25C
C, E, M
T
A
C
30
E
35
M
45
C
7
+25C
2
5
E
8
10V
V
IN
36V
M
10
C
1
6
C
1
6
E
1
7
E
1
7
M
M
2
9
6
15
0.1Hz
f
10Hz
10Hz
f
1kHz
3.0
Vp-p
Output Noise Voltage (Note 3)
e
n
+25C
2.5
5.0
V
RMS
4.995
5.000
5.005
MAX6250B
Output Voltage Temperature
Coefficient (Note 1)
TCV
OUT
ppm/C
M
2.0
5.0
MAX6250AMJA
C
2.5
5.0
MAX6250BC_A
E
2.5
7.0
MAX6250BE_A
M
2.5
8.0
MAX6250BMJA
Note 1:
Temperature coefficient is measured by the box method; i.e., the maximum
V
OUT
is divided by
T x V
OUT
.
Note 2:
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.
Note 3:
Noise specifications are 100% tested for the 10Hz to 1kHz bandwidth. Contact factory for 100% noise testing in the 0.1Hz
to 10Hz bandwidth.
Note 4:
Temperature hysteresis is specified at T
A
= +25C by measuring V
OUT
before and after changing temperature by +25C
using the PDIP package.
+25C
+25C
Sourcing: 0mA
I
OUT
15mA
Sinking: -15mA
I
OUT
0mA
ppm/mA
V
OUT
/
I
OUT
Load Regulation (Note 2)
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