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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, 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.
____________________________Features
o
Low 1.0ppm/°C Temperature Coefficient
o
Very Low 1.5µVp-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
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
-55°C to +125°C
PIN-
PACKAGE
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
2.2µF
*
REFERENCE OUT
I.C.
1
IN
2
NR
3
8
I.C.
I.C.
OUT
TRIM
NR
MAX6225
MAX6241
MAX6250
GND
TRIM
2.2µF
*
GND
4
MAX6225
MAX6241
MAX6250
7
6
5
DIP/SO
*OPTIONAL
I.C. = INTERNALLY CONNECTED; DO NOT USE
________________________________________________________________
Maxim Integrated Products
1
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.
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 (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
= +70°C)
Plastic DIP (derate 9.09mW/°C above +70°C)................727mW
SO (derate 5.88mW/°C above +70°C) ............................471mW
CERDIP (derate 8.00mW/°C above +70°C) ....................640mW
Operating Temperature Ranges
MAX62_ _ _C_ A .....................................................0°C to +70°C
MAX62_ _ _E_ A ..................................................-40°C to +85°C
MAX62_ _ _MJA ................................................-55°C to +125°C
Storage Temperature Range ..............................-65°C to +150°C
Lead Temperature (soldering, 10sec)...............................+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—MAX6225
(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
SYMBOL
V
IN
V
OUT
MAX6225A
MAX6225B
MAX6225AC_A
MAX6225AE_A
Output Voltage Temperature
Coefficient (Note 1)
TCV
OUT
MAX6225AMJA
MAX6225BC_A
MAX6225BE_A
MAX6225BMJA
CONDITIONS
T
A
C, E, M
+25°C
+25°C
C
E
M
C
E
M
+25°C
8V
≤
V
IN
≤
10V
Line Regulation (Note 2)
∆V
OUT
/
∆V
IN
10V
≤
V
IN
≤
36V
C
E
M
+25°C
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
_______________________________________________________________________________________
Low-Noise, Precision, +2.5V/+4.096V/+5V
Voltage References
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
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
Sourcing: 0mA
≤
I
OUT
≤
15mA
Load Regulation (Note 2)
∆V
OUT
/
∆I
OUT
T
A
C
E
M
Sinking: -15mA
≤
I
OUT
≤
0mA
Sinking: -15mA
≤
I
OUT
≤
0mA
C
E
M
Supply Current
Trim-Adjustment Range
Turn-On Settling Time
Output Noise Voltage (Note 3)
Temperature Hysteresis
Long-Term Stability
∆V
OUT
/ t
I
IN
∆V
OUT
t
ON
e
n
Figure 1
To ±0.01% of final value
0.1Hz
≤
f
≤
10Hz
10Hz
≤
f
≤
1kHz
(Note 4)
+25°C
C, E, M
C, E, M
+25°C
+25°C
+25°C
+25°C
+25°C
±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
µs
µV
p-p
µV
RMS
ppm
ppm/
1000h
ppm/mA
UNITS
MAX6225/MAX6241/MAX6250
_______________________________________________________________________________________
3
Low-Noise, Precision, +2.5V/+4.096V/+5V
Voltage References
MAX6225/MAX6241/MAX6250
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
= +25°C.)
PARAMETER
Input Voltage Range
Output Voltage
SYMBOL
V
IN
V
OUT
MAX6241A
MAX6241B
MAX6241AC_A
MAX6241AE_A
Output Voltage Temperature
Coefficient (Note 1)
TCV
OUT
MAX6241AMJA
MAX6241BC_A
MAX6241BE_A
MAX6241BMJA
CONDITIONS
T
A
C, E, M
+25°C
+25°C
C
E
M
C
E
M
+25°C
8V
≤
V
IN
≤
10V
Line Regulation (Note 2)
∆V
OUT
/
∆V
IN
10V
≤
V
IN
≤
36V
C
E
M
+25°C
C
E
M
C
Sourcing: 0mA
≤
I
OUT
≤
15mA
Load Regulation (Note 2)
∆V
OUT
/
∆I
OUT
Sinking: -15mA
≤
I
OUT
≤
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
∆V
OUT
/ t
I
IN
∆V
OUT
t
ON
e
n
Figure 1
To ±0.01% of final value
0.1Hz
≤
f
≤
10Hz
10Hz
≤
f
≤
1kHz
(Note 4)
+25°C
C, E, M
C, E, M
+25°C
+25°C
+25°C
+25°C
+25°C
±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
µs
µVp-p
µV
RMS
ppm
ppm/
1000h
ppm/mA
ppm/mA
ppm/V
ppm/°C
UNITS
V
V
4
_______________________________________________________________________________________
Low-Noise, Precision, +2.5V/+4.096V/+5V
Voltage References
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
= +25°C.)
PARAMETER
Input Voltage Range
Output Voltage
SYMBOL
V
IN
V
OUT
MAX6250A
MAX6250B
MAX6250AC_A
MAX6250AE_A
Output Voltage Temperature
Coefficient (Note 1)
TCV
OUT
MAX6250AMJA
MAX6250BC_A
MAX6250BE_A
MAX6250BMJA
CONDITIONS
T
A
C, E, M
+25°C
+25°C
C
E
M
C
E
M
+25°C
8V
≤
V
IN
≤
10V
Line Regulation (Note 2)
∆V
OUT
/
∆V
IN
10V
≤
V
IN
≤
36V
C
E
M
+25°C
C
E
M
C
Sourcing: 0mA
≤
I
OUT
≤
15mA
Load Regulation (Note 2)
∆V
OUT
/
∆I
OUT
Sinking: -15mA
≤
I
OUT
≤
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
∆V
OUT
/ t
I
IN
∆V
OUT
t
on
e
n
Figure 1
To ±0.01% of final value
0.1Hz
≤
f
≤
10Hz
10Hz
≤
f
≤
1kHz
(Note 4)
+25°C
C, E, M
C, E, M
+25°C
+25°C
+25°C
+25°C
+25°C
±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
µs
µVp-p
µV
RMS
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
∆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 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 T
A
= +25°C by measuring V
OUT
before and after changing temperature by +25°C
using the PDIP package.
_______________________________________________________________________________________
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