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 2.5V output, the MAX6341 is
set for a 4.096V output, and the MAX6350 is set for a
5V output. All three provide for the option of external
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 Ultra Low, 1ppm/C Max Tempco
o Very Low, 1.5Vp-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/1000hr Long-Term Stability
o Stable for All Capacitive Loads
MAX6325/MAX6341/MAX6350
1ppm/C, Low-Noise, +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
MAX6325
MAX6341
MAX6350
Typical Operating Circuit
OUT
NR
TRIM
GND
1
2
8
7
I.C.
I.C.
IN
I.C.
MAX6325
MAX6341
MAX6350
DIP/SO
TOP VIEW
I.C. = INTERNALLY CONNECTED; DO NOT USE
3
4
6
5
Pin Configuration
19-1203; Rev 1; 1/01
Ordering Information
Ordering Information continued at end of data sheet.
MAX6325CPA
MAX6325CSA
0C to +70C
0C to +70C
1.0
1.0
8 Plastic DIP
8 SO
MAX6325EPA
-40C to +85C
1.5
8 Plastic DIP
PART
TEMP. RANGE
MAX
TEMPCO
(ppm/
C)
PIN-
PACKAGE
MAX6325ESA
-40C to +85C
1.5
8 SO
MAX6325MJA
-55C to +125C
2.5
8 CERDIP
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.
MAX6325/MAX6341/MAX6350
1ppm/C, Low-Noise, +2.5V/+4.096V/+5V
Voltage References
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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
= +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) ........................5s
OUT Short-Circuit to IN Duration (V
IN
12V) ..............Continuous
Continuous Power Dissipation (T
A
= +70C)
8-Pin Plastic DIP (derate 9.09mW/C above +70C) ......727mW
8-Pin SO (derate 5.88mW/C above +70C) ...................471mW
8-Pin CERDIP (derate 8.00mW/C above +70C) ...........640mW
Operating Temperature Ranges
MAX63_ _ C_ A.......................................................0C to +70C
MAX63_ _ E_ A ....................................................-40C to +85C
MAX63_ _ MJA ..................................................-55C to +125C
Storage Temperature Range ..............................-65C to +150C
Lead Temperature (soldering, 10s)...................................+300C
Load Regulation (Note 2)
V
OUT
/
I
OUT
ppm/mA
+25C
+25C
s
5
+25C
t
ON
Turn-On Settling Time
To 0.01% of final value
V
RMS
1.3
2.8
+25C
e
n
Output Noise Voltage (Note 3)
Vp-p
1.5
mV
15
25
C, E, M
V
OUT
Trim-Adjustment Range
mA
3.0
C, E, M
I
IN
Supply Current
1.8
2.7
+25C
10
30
M
1
7
10Hz
f 1kHz
E
0.1Hz
f 10Hz
(Figure 1)
1
6
C
ppm/
1000hr
3
15
M
30
+25C
1
7
V
OUT
/t
Long-Term Stability
E
1
6
C
+25C
Temperature Hysteresis
ppm
20
(Note 4)
10
M
8
E
7
C
2
5
+25C
10V
V
IN
36V
45
M
35
E
30
C
MAX6325MJA
1.0
2.5
M
8V
V
IN
10V
CONDITIONS
MAX6325E_A
MAX6325C_A
MAX6325
ppm/V
10
18
+25C
V
OUT
/
V
IN
Line Regulation (Note 2)
ppm/C
0.75
1.5
E
TCV
OUT
Output Voltage Temperature
Coefficient (Note 1)
0.5
1.0
C
Output Voltage
V
OUT
2.499
2.500
2.501
V
T
A
C, E, M
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Input Voltage Range
V
IN
8
36
V
Sourcing: 0mA
I
OUT
15mA
Sinking: -15mA
I
OUT
0mA
MAX6325/MAX6341/MAX6350
1ppm/C, Low-Noise, +2.5V/+4.096V/+5V
Voltage References
_______________________________________________________________________________________
3
(Note 4)
V
4.095
4.096
4.097
V
OUT
Output Voltage
+25C
20
ppm
Temperature Hysteresis
C
0.5
1.0
MAX6341
Output Voltage Temperature
Coefficient (Note 1)
TCV
OUT
E
0.75
1.5
ppm/C
+25C
+25C
10
18
MAX6341C_A
MAX6341E_A
CONDITIONS
30
ppm/
1000hr
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--MAX6341
(V
IN
= +10V, I
OUT
= 0mA, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.)
M
1.0
2.5
MAX6341MJA
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
Sourcing: 0mA
I
OUT
15mA
Sinking: -15mA
I
OUT
0mA
V
OUT
/
I
OUT
Load Regulation (Note 2)
ppm/mA
MAX6325/MAX6341/MAX6350
1ppm/C, Low-Noise, +2.5V/+4.096V/+5V
Voltage References
4
_______________________________________________________________________________________
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
= +25C.)
(Note 4)
V
4.999
5.000
5.001
V
OUT
Output Voltage
+25C
20
ppm
Temperature Hysteresis
C
0.5
1.0
MAX6350
E
0.75
1.5
+25C
+25C
10
18
MAX6350C_A
MAX6350E_A
CONDITIONS
30
ppm/
1000hr
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
Output Voltage Temperature
Coefficient (Note 1)
TCV
OUT
ppm/C
M
1.0
2.5
MAX6350MJA
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 guaranteed by design.
Note 4: Temperature hysteresis is specified at T
A
= +25C by measuring V
OUT
before and after changing temperature by +25C,
using the plastic DIP package.
+25C
Sourcing: 0mA
I
OUT
15mA
Sinking: -15mA
I
OUT
0mA
ppm/mA
V
OUT
/
I
OUT
Load Regulation (Note 2)
MAX6325/MAX6341/MAX6350
1ppm/C, Low-Noise, +2.5V/+4.096V/+5V
Voltage References
_______________________________________________________________________________________
5
__________________________________________Typical Operating Characteristics
(V
IN
= +10V, I
OUT
= 0mA, T
A
= +25C, unless otherwise noted.)
2.0
-1.5
-55
-15
65
MAX6350
NORMALIZED OUTPUT VOLTAGE
vs. TEMPERATURE
-1.0
1.0
MAX6325 -01
TEMPERATURE (C)
V
OUT
(mV)
V
OUT
(ppm)
25
105
-35
5
85
45
125
0.5
0
-0.5
1.5
400
-300
-200
200
100
0
-100
300
-400
-300
-200
-100
0
100
200
300
-40 -30 -20 -10
0
10
20
30
40
MAX6350
CHANGE IN OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX6325-07
I
OUT
(mA)
V
OUT
(
V)
T
A
= +25
C
T
A
= -40
C
T
A
= +85
C
-55
-15
65
MAX6341
NORMALIZED OUTPUT VOLTAGE
vs. TEMPERATURE
-1.0
1.0
MAX6325 -02
TEMPERATURE (C)
V
OUT
(mV)
V
OUT
(ppm)
25
105
-35
5
85
45
125
0.5
0
-0.5
1.5
-250
-125
0
125
250
375
-0.4
-0.3
-0.2
-0.1
0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
-160
-120
-80
-40
40
80
120
160
200
240
280
-55
-15
65
MAX6325
NORMALIZED OUTPUT VOLTAGE
vs. TEMPERATURE
MAX6325 03
TEMPERATURE (C)
V
OUT
(mV)
V
OUT
(ppm)
25
105
-35
5
85
45
125
-300
-200
-100
0
100
200
300
-40 -30 -20 -10
0
10
20
30
40
MAX6341
CHANGE IN OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX6325-06
I
OUT
(mA)
V
OUT
(
V)
T
A
= +25
C
T
A
= -40
C
T
A
= +85
C
-250
-200
-150
-100
-50
0
50
100
150
200
-40 -30 -20 -10
0
10
20
30
40
MAX6325
CHANGE IN OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX6325-05
I
OUT
(mA)
V
OUT
(
V)
T
A
= +85
C
T
A
= -40
C
T
A
= +25
C
-20
-10
0
10
20
30
40
50
60
0
5
10
15
20
25
30
35
40
CHANGE IN OUTPUT VOLTAGE
vs. INPUT VOLTAGE
MAX6325-04
V
IN
(V)
V
OUT
(ppm)
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
0
5
10
15
20
25
30
35
40
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX6325-08
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
MAX6325
MAX6341
MAX6350
1.0
1.5
2.0
2.5
3.0
3.5
-55 -35 -15
5
25 45
65
85 105 125
SUPPLY CURRENT vs. TEMPERATURE
MAX6325-09
TEMPERATURE (C)
SUPPLY CURRENT (mA)
MAX6341
MAX6350
MAX6325
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