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19-1203; Rev 0; 4/97
1ppm/°C, Low-Noise, +2.5V/+4.096V/+5V
Voltage References
_______________General Description
The MAX6325/MAX6341/MAX6350 are low-noise, preci-
sion voltage references with extremely low, 0.5ppm/°C
typical temperature coefficients and excellent, ±0.02%
initial accuracy. These devices feature buried-zener
technology for lowest noise performance. Load-regula-
tion specifications are guaranteed for source and sink
currents up to 15mA. Excellent line and load regulation
and low output impedance at high frequencies make
them ideal for high-resolution data-conversion systems
up to 16 bits.
The MAX6325 is set for a 2.500V output, the MAX6341
is set for a 4.096V output, and the MAX6350 is set for a
5.000V output. All three provide for the option of exter-
nal trimming and noise reduction.
____________________________Features
o
Ultra-Low, 1ppm/°C Max Tempco
o
Very Low, 1.5µVp-p Noise (0.1Hz to 10Hz)
(MAX6325)
o
±0.02% Initial Accuracy (MAX6350)
o
±15mA Output Source and Sink Current
o
Low, 18mW Power Consumption (MAX6325)
o
Industry-Standard Pinout
o
Optional Noise Reduction and Voltage Trim
o
Excellent Transient Response
o
8-Pin SO Package Available
o
Low, 30ppm/1000h Long-Term Stability
o
Stable for All Capacitive Loads
MAX6325/MAX6341/MAX6350
________________________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
______________Ordering Information
PART
MAX6325CPA
MAX6325CSA
MAX6325EPA
MAX6325ESA
MAX6325MJA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
PIN-
PACKAGE
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 CERDIP
MAX
TEMPCO
(ppm/
°
C)
1.0
1.0
1.5
1.5
2.5
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
MAX6325
MAX6341
MAX6350
GND
TRIM
2.2µF
*
GND
4
MAX6325
MAX6341
MAX6350
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
1ppm/°C, Low-Noise, +2.5V/+4.096V/+5V
Voltage References
MAX6325/MAX6341/MAX6350
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
MAX63_ _ C_ A.......................................................0°C to +70°C
MAX63_ _ E_ A....................................................-40°C to +85°C
MAX63_ _ 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—MAX6325
(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)
SYMBOL
V
IN
V
OUT
TCV
OUT
MAX6325
MAX6325C_A
MAX6325E_A
MAX6325MJA
CONDITIONS
T
A
C, E, M
+25°C
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
±15
±25
5
1.5
1.3
20
30
2.8
1
1
3
1
1
10
1.8
2
MIN
8
2.499
2.500
0.5
0.75
1.0
10
TYP
MAX
36
2.501
1.0
1.5
2.5
18
30
35
45
5
7
8
10
6
7
15
6
7
30
2.7
3.0
mA
mV
µs
µVp-p
µV
RMS
ppm
ppm/
1000h
ppm/mA
ppm/V
ppm/°C
UNITS
V
V
2
_______________________________________________________________________________________
1ppm/°C, Low-Noise, +2.5V/+4.096V/+5V
Voltage References
MAX6325/MAX6341/MAX6350
ELECTRICAL CHARACTERISTICS—MAX6341
(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)
SYMBOL
V
IN
V
OUT
TCV
OUT
MAX6341
MAX6341C_A
MAX6341E_A
MAX6341MJA
CONDITIONS
T
A
C, E, M
+25°C
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
30
4.0
1
1
3
1
1
7
1.9
2
MIN
8
4.095
4.096
0.5
0.75
1.0
10
TYP
MAX
36
4.097
1.0
1.5
2.5
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/V
ppm/°C
UNITS
V
V
_______________________________________________________________________________________
3
1ppm/°C, Low-Noise, +2.5V/+4.096V/+5V
Voltage References
MAX6325/MAX6341/MAX6350
ELECTRICAL CHARACTERISTICS—MAX6350
(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)
SYMBOL
V
IN
V
OUT
TCV
OUT
MAX6350
MAX6350C_A
MAX6350E_A
MAX6350MJA
CONDITIONS
T
A
C, E, M
+25°C
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
30
5.0
1
1
2
1
1
6
2.0
2
MIN
8
4.999
5.000
0.5
0.75
1.0
10
TYP
MAX
36
5.001
1.0
1.5
2.5
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
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
∆
VIN
)) 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. Production testing in the 0.1Hz to 10Hz bandwidth is
available upon request.
Note 4:
Temperature hysteresis is specified at T
A
= +25°C by measuring V
OUT
before and after changing temperature by +25°C
using the plastic DIP package.
4
_______________________________________________________________________________________
1ppm/°C, Low-Noise, +2.5V/+4.096V/+5V
Voltage References
__________________________________________Typical Operating Characteristics
(V
IN
= 10V, I
OUT
= 0mA, T
A
= +25°C, unless otherwise noted.)
MAX6325/MAX6341/MAX6350
MAX6350
NORMALIZED OUTPUT VOLTAGE
vs. TEMPERATURE
2.0
1.5
1.0
∆V
OUT
(mV)
0.5
0
MAX6325 -01
MAX6341
NORMALIZED OUTPUT VOLTAGE
vs. TEMPERATURE
400
300
200
∆V
OUT
(ppm)
∆V
OUT
(ppm)
∆V
OUT
(mV)
100
0
0.5
125
∆V
OUT
(mV)
1.5
MAX6325 -02
MAX6325
NORMALIZED OUTPUT VOLTAGE
vs. TEMPERATURE
375
250
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
MAX6325 03
280
240
200
160
120
80
40
0
-40
-80
-120
∆V
OUT
(ppm)
1.0
0
0
-0.5
-1.0
-1.5
-55 -35 -15
-100
-0.5
-200
-300
65 85 105 125
-1.0
-55 -35 -15
-250
65 85 105 125
-125
-0.1
-0.2
-0.3
-0.4
-55 -35 -15
5
25 45
5
25 45
5
25 45
-160
65 85 105 125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
MAX6350
CHANGE IN OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX6325-07
MAX6341
CHANGE IN OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX6325-06
MAX6325
CHANGE IN OUTPUT VOLTAGE
vs. OUTPUT CURRENT
150
100
MAX6325-05
300
200
100
∆V
OUT
(µV)
300
200
100
0
-100
T
A
= -40°C
T
A
= +85°C
200
∆V
OUT
(µV)
0
-100
-200
-300
-400
T
A
= -40°C
T
A
= +85°C
T
A
= +25°C
∆V
OUT
(µV)
50
0
-50
-100
-150
-200
-250
T
A
= +85°C
T
A
= -40°C
T
A
= +25°C
T
A
= +25°C
-200
-300
-40 -30 -20 -10
0
10
20
30
40
-40 -30 -20 -10
0
10
20
30
40
-40 -30 -20 -10
0
10
20
30
40
I
OUT
(mA)
I
OUT
(mA)
I
OUT
(mA)
CHANGE IN OUTPUT VOLTAGE
vs. INPUT VOLTAGE
MAX6325-04
SUPPLY CURRENT vs. SUPPLY VOLTAGE
2.8
SUPPLY CURRENT (mA)
2.6
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
MAX6325
MAX6341
MAX6350
MAX6325-08
SUPPLY CURRENT vs. TEMPERATURE
MAX6325-09
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
SUPPLY CURRENT (mA)
3.0
2.5
MAX6341
2.0
MAX6350
1.5
MAX6325
40
-55 -35 -15
5
25 45
65 85 105 125
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
_______________________________________________________________________________________
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