Maxim MAX6325CSA 1ppm/â°c, low-noise, 2.5v/4.096v/5v voltage reference Datasheet

19-1203; Rev 0; 4/97
1ppm/°C, Low-Noise, +2.5V/+4.096V/+5V
Voltage References
____________________________Features
♦ Ultra-Low, 1ppm/°C Max Tempco
♦ Very Low, 1.5µVp-p Noise (0.1Hz to 10Hz)
(MAX6325)
♦ ±0.02% Initial Accuracy (MAX6350)
♦ ±15mA Output Source and Sink Current
♦ Low, 18mW Power Consumption (MAX6325)
♦ Industry-Standard Pinout
♦ Optional Noise Reduction and Voltage Trim
♦ Excellent Transient Response
♦ 8-Pin SO Package Available
♦ Low, 30ppm/1000h Long-Term Stability
♦ Stable for All Capacitive Loads
________________________Applications
High-Resolution Analog-to-Digital
and Digital-to-Analog Converters
______________Ordering Information
PART
TEMP. RANGE
PINPACKAGE
MAX
TEMPCO
(ppm/°C)
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
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 CERDIP
1.0
1.0
1.5
1.5
2.5
High-Accuracy Reference Standard
High-Accuracy Industrial and Process Control
Digital Voltmeters
ATE Equipment
Precision Current Sources
Ordering Information continued at end of data sheet.
__________Typical Operating Circuit
IN
OUT
2.2µF *
NR
__________________Pin Configuration
TOP VIEW
8V TO 36V INPUT
MAX6325
MAX6341
MAX6350
MAX6325CPA
MAX6325CSA
MAX6325EPA
MAX6325ESA
MAX6325MJA
REFERENCE OUT
I.C. 1
IN 2
NR 3
TRIM
2.2µF *
MAX6325
MAX6341
MAX6350
GND 4
8
I.C.
7
I.C.
6
OUT
5
TRIM
GND
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
MAX6325/MAX6341/MAX6350
_______________General Description
The MAX6325/MAX6341/MAX6350 are low-noise, precision 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-regulation 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 external trimming and noise reduction.
MAX6325/MAX6341/MAX6350
1ppm/°C, Low-Noise, +2.5V/+4.096V/+5V
Voltage References
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 (VIN ≤ 12V)..........Continuous
OUT Short Circuit to GND Duration (VIN ≤ 40V) ....................5sec
OUT Short Circuit to IN Duration (VIN ≤ 12V) ..............Continuous
Continuous Power Dissipation (TA = +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
(VIN = 10V, IOUT = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
Input Voltage Range
Output Voltage
Output Voltage Temperature
Coefficient (Note 1)
SYMBOL
CONDITIONS
VIN
VOUT
TCVOUT
MAX6325
Turn-On Settling Time
Output Noise Voltage (Note 3)
Temperature Hysteresis
Long-Term Stability
2
∆VOUT / t
2.501
V
1.0
1.5
MAX6325MJA
M
1.0
2.5
+25°C
10
18
C
30
E
35
M
45
+25°C
IIN
en
V
2.500
0.5
∆VOUT /
∆IOUT
tON
UNITS
36
0.75
∆VOUT /
∆VIN
∆VOUT
2.499
MAX
E
Sinking: -15mA ≤ IOUT ≤ 0mA
Trim-Adjustment Range
+25°C
TYP
C
Sourcing: 0mA ≤ IOUT ≤ 15mA
Supply Current
8
MAX6325C_A
10V ≤ VIN ≤ 36V
Load Regulation (Note 2)
MIN
MAX6325E_A
8V ≤ VIN ≤ 10V
Line Regulation (Note 2)
TA
C, E, M
2
C
5
ppm/°C
ppm/V
7
E
8
M
10
C
1
6
E
1
7
M
3
15
C
1
6
E
1
7
M
10
30
+25°C
1.8
2.7
C, E, M
3.0
±15
±25
ppm/mA
mA
Figure 1
C, E, M
To ±0.01% of final value
+25°C
5
µs
0.1Hz ≤ f ≤ 10Hz
+25°C
1.5
µVp-p
10Hz ≤ f ≤ 1kHz
+25°C
1.3
(Note 4)
+25°C
20
ppm
+25°C
30
ppm/
1000h
_______________________________________________________________________________________
mV
2.8
µVRMS
1ppm/°C, Low-Noise, +2.5V/+4.096V/+5V
Voltage References
(VIN = 10V, IOUT = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
Input Voltage Range
Output Voltage
SYMBOL
VOUT
Output Voltage Temperature
Coefficient (Note 1)
CONDITIONS
VIN
TCVOUT
MAX6341
Output Noise Voltage (Note 3)
en
Temperature Hysteresis
Long-Term Stability
∆VOUT / t
4.097
V
1.0
1.5
MAX6341MJA
M
1.0
2.5
+25°C
10
18
C
30
E
35
M
45
+25°C
∆VOUT /
∆IOUT
tON
V
4.096
0.5
IIN
Turn-On Settling Time
UNITS
36
0.75
∆VOUT /
∆VIN
∆VOUT
4.095
MAX
E
Sinking: -15mA ≤ IOUT ≤ 0mA
Trim-Adjustment Range
+25°C
TYP
C
Sourcing: 0mA ≤ IOUT ≤ 15mA
Supply Current
8
MAX6341E_A
10V ≤ VIN ≤ 36V
Load Regulation (Note 2)
MIN
MAX6341C_A
8V ≤ VIN ≤ 10V
Line Regulation (Note 2)
TA
C, E, M
2
C
5
ppm/°C
ppm/V
7
E
8
M
10
C
1
6
E
1
7
M
3
9
C
1
6
E
1
7
M
7
18
+25°C
1.9
C, E, M
2.9
3.2
±24
±40
ppm/mA
mA
Figure 1
C, E, M
mV
To ±0.01% of final value
+25°C
8
µs
0.1Hz ≤ f ≤ 10Hz
+25°C
2.4
µVp-p
10Hz ≤ f ≤ 1kHz
+25°C
2.0
(Note 4)
+25°C
20
ppm
+25°C
30
ppm/
1000h
4.0
µVRMS
_______________________________________________________________________________________
3
MAX6325/MAX6341/MAX6350
ELECTRICAL CHARACTERISTICS—MAX6341
MAX6325/MAX6341/MAX6350
1ppm/°C, Low-Noise, +2.5V/+4.096V/+5V
Voltage References
ELECTRICAL CHARACTERISTICS—MAX6350
(VIN = 10V, IOUT = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
Input Voltage Range
Output Voltage
Output Voltage Temperature
Coefficient (Note 1)
SYMBOL
CONDITIONS
VIN
VOUT
TCVOUT
MAX6350
Output Noise Voltage (Note 3)
E
0.75
1.5
M
1.0
2.5
+25°C
10
18
Temperature Hysteresis
Long-Term Stability
∆VOUT / t
C
30
E
35
M
45
+25°C
IIN
en
V
MAX6350E_A
∆VOUT /
∆IOUT
ton
V
1.0
∆VOUT /
∆VIN
∆VOUT
UNITS
36
5.001
Sinking: -15mA ≤ IOUT ≤ 0mA
Turn-On Settling Time
4.999
MAX
0.5
Sourcing: 0mA ≤ IOUT ≤ 15mA
Trim-Adjustment Range
+25°C
TYP
5.000
10V ≤ VIN ≤ 36V
Supply Current
8
C
8V ≤ VIN ≤ 10V
Load Regulation (Note 2)
MIN
MAX6350C_A
MAX6350MJA
Line Regulation (Note 2)
TA
C, E, M
2
C
5
ppm/°C
ppm/V
7
E
8
M
10
C
1
6
E
1
7
M
2
9
C
1
6
E
1
7
M
6
15
+25°C
2.0
3.0
C, E, M
3.3
±50
mA
Figure 1
C, E, M
To ±0.01% of final value
+25°C
10
µs
0.1Hz ≤ f ≤ 10Hz
+25°C
3.0
µVp-p
10Hz ≤ f ≤ 1kHz
+25°C
2.5
(Note 4)
+25°C
20
ppm
30
ppm/
1000h
+25°C
±30
ppm/mA
mV
5.0
µVRMS
Note 1: Temperature coefficient is measured by the box method; i.e., the maximum ∆VOUT is divided by ∆T x VOUT.
Note 2: Line regulation (∆VOUT / (VOUT x ∆VIN)) and load regulation (∆VOUT / (VOUT x ∆IOUT)) 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 TA = +25°C by measuring VOUT 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
MAX6341
NORMALIZED OUTPUT VOLTAGE
vs. TEMPERATURE
200
0.5
100
0
0
-0.5
-100
-1.0
-200
0.5
125
0
0
-0.5
-1.5
-55 -35 -15
5
25 45
-125
-1.0
-55 -35 -15
-300
65 85 105 125
∆VOUT (mV)
1.0
250
1.0
5
-250
65 85 105 125
25 45
160
0.3
120
0.2
80
0.1
40
0
0
-0.1
-40
-0.2
-80
-0.3
-120
-0.4
-55 -35 -15
-160
65 85 105 125
25 45
MAX6341
CHANGE IN OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX6325
CHANGE IN OUTPUT VOLTAGE
vs. OUTPUT CURRENT
150
100
-100
100
∆VOUT (µV)
∆VOUT (µV)
TA = +85°C
TA = +25°C
0
TA = -40°C
TA = +25°C
-300
10
20
30
40
TA = +85°C
-250
-40 -30 -20 -10
IOUT (mA)
0
10
20
30
-40 -30 -20 -10
40
CHANGE IN OUTPUT VOLTAGE
vs. INPUT VOLTAGE
40
30
20
10
0
2.6
MAX6350
2.4
MAX6341
MAX6325
2.2
2.0
1.8
1.6
2.5
MAX6350
MAX6341
2.0
MAX6325
1.0
1.0
5
10
15
20
VIN (V)
25
30
35
40
40
3.0
1.2
-20
30
1.5
1.4
-10
20
3.5
MAX6325-08
2.8
SUPPLY CURRENT (mA)
50
10
SUPPLY CURRENT vs. TEMPERATURE
SUPPLY CURRENT vs. SUPPLY VOLTAGE
3.0
MAX6325-04
60
0
IOUT (mA)
IOUT (mA)
SUPPLY CURRENT (mA)
0
TA = +25°C
-50
-200
-300
-40 -30 -20 -10
TA = -40°C
-150
-200
-400
0
-100
-100
-200
50
MAX6325-09
TA = -40°C
MAX6325-05
200
MAX6325-06
MAX6325-07
TA = +85°C
200
0
5
MAX6350
CHANGE IN OUTPUT VOLTAGE
vs. OUTPUT CURRENT
100
∆VOUT (µV)
200
0.4
TEMPERATURE (°C)
200
∆VOUT (ppm)
240
0.5
TEMPERATURE (°C)
300
280
0.6
TEMPERATURE (°C)
300
0
MAX6325 03
0.7
375
∆VOUT (ppm)
300
∆VOUT (mV)
∆VOUT (mV)
1.5
MAX6325 -02
1.5
400
∆VOUT (ppm)
MAX6325 -01
2.0
MAX6325
NORMALIZED OUTPUT VOLTAGE
vs. TEMPERATURE
∆VOUT (ppm)
MAX6350
NORMALIZED OUTPUT VOLTAGE
vs. TEMPERATURE
0
5
10
15
20
25
30
SUPPLY VOLTAGE (V)
35
40
-55 -35 -15
5
25 45
65 85 105 125
TEMPERATURE (°C)
_______________________________________________________________________________________
5
MAX6325/MAX6341/MAX6350
__________________________________________Typical Operating Characteristics
(VIN = 10V, IOUT = 0mA, TA = +25°C, unless otherwise noted.)
____________________________Typical Operating Characteristics (continued)
(VIN = 10V, IOUT = 0mA, TA = +25°C, unless otherwise noted.)
MAX6341
OUTPUT NOISE-VOLTAGE
DENSITY vs. FREQUENCY
CNR = 0µF
35
30
25
20
CNR = 1µF
15
10
5
70
CNR = 0µF
60
50
40
30
CNR = 1µF
20
10
0
0
10
100
1k
100
1k
MAX6325-17
30
CNR = 1µF
20
10
10
100
MAX6325-18
COUT = CNR = 0µF
VOUT, 1µV/div
VOUT, 1µV/div
VOUT, 0.5µV/div
1sec/div
RIPPLE REJECTION
vs. FREQUENCY (CNR = 0µF)
RIPPLE REJECTION (dB)
ISINK = 5mA
100
MAX6341
MAX6350
80
ISOURCE = 5mA
85
MAX6350
80
75
70
65
60
60
1M
MAX6325
MAX6341
90
RIPPLE REJECTION (dB)
MAX6325
90
95
MAX6325-14
120
MAX6325-13
1
10k
MAX6350
0.1Hz to 10Hz NOISE
RIPPLE REJECTION
vs. FREQUENCY (CNR = 1µF)
10
1k
FREQUENCY (Hz)
70
6
40
1sec/div
110
1k
10k
100k
FREQUENCY (Hz)
50
10k
COUT = CNR = 0µF
OUTPUT IMPEDANCE vs. FREQUENCY
100
60
MAX6325-16
1sec/div
10
CNR = 0µF
70
MAX6341
0.1Hz to 10Hz NOISE
COUT = CNR = 0µF
0.01
80
FREQUENCY (Hz)
MAX6325
0.1Hz to 10Hz NOISE
100
90
0
10
10k
FREQUENCY (Hz)
0.1
100
MAX6325-12
80
10
100
1k
FREQUENCY (Hz)
10k
10
100
1k
FREQUENCY (Hz)
_______________________________________________________________________________________
10k
MAX6325-15
40
90
MAX6325-11
45
OUTPUT NOISE DENSITY (nV/√ Hz)
MAX6325-10
OUTPUT NOISE DENSITY (nV/√ Hz)
50
MAX6350
OUTPUT NOISE-VOLTAGE
DENSITY vs. FREQUENCY
OUTPUT NOISE DENSITY (nV/√ Hz)
MAX6325
OUTPUT NOISE-VOLTAGE
DENSITY vs. FREQUENCY
OUTPUT IMPEDANCE (Ω)
MAX6325/MAX6341/MAX6350
1ppm/°C, Low-Noise, +2.5V/+4.096V/+5V
Voltage References
1ppm/°C, Low-Noise, +2.5V/+4.096V/+5V
Voltage References
(VIN = 10V, IOUT = 0mA, TA = +25°C, unless otherwise noted.)
LOAD-TRANSIENT RESPONSE (SOURCING)
LOAD-TRANSIENT RESPONSE (SINKING)
MAX6325-19
MAX6325-20
0mA
A
10mA
A
-10mA
0mA
B
B
2µs/div
2µs/div
A: IOUT, 10mA/div (SINKING)
B: VOUT, 500µV/div
A: IOUT, 10mA/div (SOURCING)
B: VOUT, 500µV/div
MAX6325
TURN-ON AND TURN-OFF TRANSIENT RESPONSE
LOAD-TRANSIENT RESPONSE
MAX6325-21
MAX6325-26
-10mA
A
+10V
A
+10mA
0V
B
B
VIN = 10V
COUT = CNR = 0µF
CIN = COUT = CNR = 0µF
1µs/div
1µs/div
A: IOUT (±10mA SOURCE AND SINK), 20mA/div, AC COUPLED
B: VOUT, 20mV/div, AC COUPLED
A:
B:
VIN, 10V/div
VOUT, 1V/div
MAX6350
TURN-ON AND TURN-OFF TRANSIENT RESPONSE
MAX6341
TURN-ON AND TURN-OFF TRANSIENT RESPONSE
MAX6325-27
MAX6325-25
+10V
A
+10V
A
0V
0V
B
B
CIN = COUT = CNR = 0µF
CIN = COUT = CNR = 0µF
1µs/div
1µs/div
A: VIN, 10V/div
B: VOUT, 1V/div
A: VIN, 10V/div
B: VOUT, 1V/div
_______________________________________________________________________________________
7
MAX6325/MAX6341/MAX6350
____________________________Typical Operating Characteristics (continued)
MAX6325/MAX6341/MAX6350
1ppm/°C, Low-Noise, +2.5V/+4.096V/+5V
Voltage References
_____________________Pin Description
PIN
NAME
1, 7, 8
I.C.
Internally Connected. Do not use.
2
IN
Positive Power-Supply Input
NR
Noise Reduction. Optional capacitor
connection for wideband noise
reduction. Leave open if not used
(Figure 2).
3
FUNCTION
4
GND
Ground
5
TRIM
External Trim Input. Allows ±1%
output adjustment (Figure 1).
Leave open if not used.
6
OUT
Voltage Reference Output
Noise Reduction
To augment wideband noise reduction, add a 1µF
capacitor to the NR pin (Figure 2). Larger values do not
improve noise appreciably (see Typical Operating
Characteristics).
Noise in the power-supply input can affect output
noise, but can be reduced by adding an optional
bypass capacitor to the IN pin and GND.
Bypassing
The MAX6325/MAX6341/MAX6350 are stable with
capacitive load values from 0µF to 100µF, for all values
of load current. Adding an output bypass capacitor can
help reduce noise and output glitching caused by load
transients.
__________Applications Information
Negative Regulator
_______________Detailed Description
Temperature Stability
The MAX6325/MAX6341/MAX6350 are highly stable,
low-noise voltage references that use a low-power temperature-compensation scheme to achieve laboratorystandard temperature stability. This produces a nearly
flat temperature curve, yet does not require the power
associated with heated references.
The output voltage can be trimmed a minimum of 0.6%
by connecting a 10kΩ potentiometer between OUT and
GND, and connecting its tap to the TRIM pin, as shown
in Figure 1. The external trimming does not affect temperature stability.
Figure 3 shows how both a +5V and -5V precision reference can be obtained from a single, unregulated +5V
supply. A MAX681 generates approximately ±9V to
operate the MAX6350 reference and MAX400 inverting
amplifier. The +5V is inverted by the ultra-low offset
MAX400 op amp. Resistor R1 is optional, and may be
used to trim the ±5V references. R2 and R4 should be
matched, both in absolute resistance and temperature
coefficient. R3 is optional, and is adjusted to set the -5V
reference.
8V TO 36V INPUT
8V TO 36V INPUT
IN
IN
REFERENCE OUT
NR
MAX6325
MAX6341
MAX6350
*
TRIM
GND
REFERENCE OUT
OUT
OUT
10k
NR
1µF
MAX6325
MAX6341
MAX6350
TRIM
GND
*OPTIONAL
Figure 1. Output Voltage Adjustment
8
Figure 2. Noise-Reduction Capacitor
_______________________________________________________________________________________
1ppm/°C, Low-Noise, +2.5V/+4.096V/+5V
Voltage References
3.3µF
C1+
VCC
V+
+REFERENCE OUT
IN
C1-
OUT
R2
100k
MAX865
3.3µF
C1
2.2µF
C2+
C2-
GND
MAX6350
V-
NR
TRIM
GND
0.1µF
R1
10k
C3
2.2µF
C2
1µF
2.2µF
R3
1k
C4
1µF
R4
100k
MAX400
0.1µF
-REFERENCE OUT
Figure 3. +5V and -5V References from a Single +5V Supply
_Ordering Information (continued)
PART
MAX6341CPA
MAX6341CSA
MAX6341EPA
MAX6341ESA
MAX6341MJA
MAX6350CPA
MAX6350CSA
MAX6350EPA
MAX6350ESA
MAX6350MJA
TEMP. RANGE
PINPACKAGE
MAX.
TEMPCO
(ppm/°C)
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
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
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 CERDIP
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 CERDIP
1.0
1.0
1.5
1.5
2.5
1.0
1.0
1.5
1.5
2.5
___________________Chip Information
TRANSISTOR COUNT: 435
_______________________________________________________________________________________
9
MAX6325/MAX6341/MAX6350
+5V INPUT
SOICN.EPS
________________________________________________________Package Information
PDIPN.EPS
MAX6325/MAX6341/MAX6350
1ppm/°C, Low-Noise, +2.5V/+4.096V/+5V
Voltage References
10
______________________________________________________________________________________
1ppm/°C, Low-Noise, +2.5V/+4.096V/+5V
Voltage References
CDIPS.EPS
______________________________________________________________________________________
11
MAX6325/MAX6341/MAX6350
___________________________________________Package Information (continued)
MAX6325/MAX6341/MAX6350
1ppm/°C, Low-Noise, +2.5V/+4.096V/+5V
Voltage References
NOTES
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
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© 1997 Maxim Integrated Products
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is a registered trademark of Maxim Integrated Products.
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