MAX6126
Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
Benefits and Features
The MAX6126 is an ultra-low-noise, high-precision, low-
dropout voltage reference. This family of voltage references
feature curvature-correction circuitry and high-stability,
laser-trimmed, thin-film resistors that result in 3ppm/°C
(max) temperature coefficients and an excellent ±0.02%
(max) initial accuracy. The proprietary low-noise reference
architecture produces a low flicker noise of 1.3μV
P-P
and
wideband noise as low as 60nV/√Hz (2.048V output) without
the increased supply current usually found in low-noise
references. Improve wideband noise to 35nV/√Hz
and AC
power-supply rejection by adding a 0.1μF capacitor at the
noise reduction pin. The MAX6126 series mode reference
operates from a wide 2.7V to 12.6V supply voltage range
and load-regulation specifications are guaranteed to be
less than 0.025Ω for sink and source currents up to 10mA.
These devices are available over the automotive temperature
range of -40°C to +125°C.
The MAX6126 typically draws 380μA of supply current
and is available in 2.048V, 2.500V, 2.800V, 3.000V,
3.300V, 3.600V, 4.096V, and 5.000V output voltages. The
MAX6126 also feature dropout voltages as low as 200mV.
Unlike conventional shunt-mode (two-terminal) references
that waste supply current and require an external resistor,
the MAX6126 offers supply current that is virtually independent
of supply voltage and does not require an external resistor.
The MAX6126 is stable with 0.1μF to 10μF of load capacitance.
The MAX6126 is available in the tiny 8-pin μMAX
®
, as well
as 8-pin SO packages.
General Description
● Ultra-Low 1.3μV
P-P
Noise (0.1Hz to 10Hz, 2.048V
Output)
●
Ultra-Low 3ppm/°C (max) Temperature Coefficient
●
±0.02% (max) Initial Accuracy
● Wide (V
OUT
+ 200mV) to 12.6V Supply Voltage
Range
● Low 200mV (max) Dropout Voltage
● 380μA Quiescent Supply Current
●
10mA Sink/Source-Current Capability
●
Stable with C
LOAD
= 0.1μF to 10μF
●
Low 20ppm/1000hr Long-Term Stability
● 0.025Ω (max) Load Regulation
● 20μV/V (max) Line Regulation
● Force and Sense Outputs for Remote Sensing
Pin Configuration
TOP VIEW
NR 1
IN 2
GND
3
8
I.C.*
OUTF
OUTS
I.C.*
MAX6126
7
6
5
Applications
●
●
●
●
●
●
GNDS 4
High-Resolution A/D and D/A Converters
ATE Equipment
High-Accuracy Reference Standard
Precision Current Sources
Digital Voltmeters
High-Accuracy Industrial and Process Control
SO/µMAX
*I.C. = INTERNALLY CONNECTED. DO NOT USE.
Ordering Information
continued at end of data sheet.
μMAX is a registered trademark of Maxim Integrated Products, Inc.
Ordering Information
PART
MAX6126AASA21+
MAX6126BASA21+
MAX6126A21+
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-
PACKAGE
8 SO
8 SO
8 µMAX
OUTPUT
VOLTAGE
(V)
2.048
2.048
2.048
MAXIMUM INITIAL
ACCURACY (%)
0.02
0.06
0.06
MAXIMUM TEMPCO
(-40°C to +85°C)
(ppm/°C)
3
5
3
+Denotes a lead(Pb)-free/RoHS-compliant package.
19-2647; Rev 8; 6/16
MAX6126
Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
Absolute Maximum Ratings
(All voltages referenced to GND)
GNDS ...................................................................-0.3V
to +0.3V
IN ...........................................................................-0.3V
to +13V
OUTF, OUTS, NR
......-0.3V
to the lesser of (V
IN
+ 0.3V) or +6V
Output Short Circuit to GND or IN......................................... 60s
Continuous Power Dissipation (T
A
= +70°C)
8-Pin μMAX (derate 4.5mW/°C above +70°C)
............362mW
8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW
Operating Temperature Range ......................... -40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) ................................. +300°C
Soldering Temperature (reflow) ....................................... +260°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.
(V
IN
= 5V, C
LOAD
= 0.1μF, I
OUT
= 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
OUTPUT
Output Voltage
Output Voltage Accuracy
V
OUT
T
A
= +25°C
Referred to
V
OUT
,
T
A
= +25°C
2.048
A grade SO
B grade SO
A grade µMAX
B grade µMAX
A grade SO
T
A
= -40°C
to +85°C
Output Voltage Temperature
Coefficient (Note 1)
TCV
OUT
T
A
= -40°C
to +125°C
DV
OUT
/
DV
IN
DV
OUT
/
DI
OUT
I
SC
DV
OUT
/
cycle
DV
OUT
/
time
2.7V ≤ V
IN
≤
12.6V
B grade SO
A grade µMAX
B grade µMAX
A grade SO
B grade SO
A grade µMAX
B grade µMAX
Line Regulation
Load Regulation
OUT Short-Circuit Current
Thermal Hysteresis (Note 2)
Long-Term Stability
T
A
= -40°C to +125°C
T
A
= +25°C
-0.02
-0.06
-0.06
-0.1
0.5
1
1
2
1
2
2
3
2
0.7
1.3
160
20
25
80
SO
µMAX
20
100
+0.02
+0.06
+0.06
+0.1
3
5
3
7
5
10
5
12
20
40
25
25
µV/V
µV/mA
mA
ppm
ppm/
1000hr
ppm/°C
%
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Electrical Characteristics—MAX6126_21 (V
OUT
= 2.048V)
Sinking: -10mA ≤ I
OUT
≤ 0
Short to GND
Short to IN
SO
µMAX
1000hr at T
A
= +25°C
Sourcing: 0 ≤ I
OUT
≤ 10mA
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Maxim Integrated
│
2
MAX6126
Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
(V
IN
= 5V, C
LOAD
= 0.1μF, I
OUT
= 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
DYNAMIC CHARACTERISTICS
f = 0.1Hz to 10Hz
Noise Voltage
Turn-On Settling Time
Capacitive-Load Stability Range
INPUT
Supply Voltage Range
Quiescent Supply Current
e
OUT
t
R
C
LOAD
V
IN
I
IN
f = 1kHz, C
NR
= 0.1µF
To V
OUT
= 0.01% of
final value
No sustained oscillations
f = 1kHz, C
NR
= 0
1.3
60
35
C
NR
= 0
0.8
20
0.1 to 10
2.7
380
12.6
550
725
C
NR
= 0.1µF
µV
P-P
nV/√Hz
ms
µF
V
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Electrical Characteristics—MAX6126_21 (V
OUT
= 2.048V) (continued)
Guaranteed by line-regulation test
T
A
= -40°C to +125°C
T
A
= +25°C
Electrical Characteristics—MAX6126_25 (V
OUT
= 2.500V)
PARAMETER
OUTPUT
Output Voltage
Output Voltage Accuracy
V
OUT
T
A
= +25°C
Referred to V
OUT
,
T
A
= +25°C
SYMBOL
CONDITIONS
(V
IN
= 5V, C
LOAD
= 0.1μF, I
OUT
= 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
MIN
TYP
2.500
A grade SO
B grade SO
A grade µMAX
B grade µMAX
A grade SO
T
A
= -40°C to
+85°C
Output Voltage Temperature
Coefficient (Note 1)
TCV
OUT
T
A
= -40°C to
+125°C
DV
OUT
/
DV
IN
DV
OUT
/
DI
OUT
B grade SO
A grade µMAX
B grade µMAX
A grade SO
B grade SO
A grade µMAX
B grade µMAX
Line Regulation
Load Regulation
2.7V ≤ V
IN
≤ 12.6V
T
A
= +25°C
T
A
= -40°C to +125°C
-0.02
-0.06
-0.06
-0.1
0.5
1
1
2
1
2
2
3
3
1
1.8
+0.02
+0.06
+0.06
+0.1
3
5
3
7
5
10
5
12
20
40
25
25
µV/V
µV/mA
ppm/°C
%
MAX
UNITS
V
Sinking: -10mA ≤ I
OUT
≤ 0
Sourcing: 0 ≤ I
OUT
≤ 10mA
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Maxim Integrated
│
3
MAX6126
Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
Electrical Characteristics—MAX6126_25 (V
OUT
= 2.500V)
(continued)
PARAMETER
Dropout Voltage (Note 3)
OUT Short-Circuit Current
Thermal Hysteresis (Note 2)
Long-Term Stability
DYNAMIC CHARACTERISTICS
f = 0.1Hz to 10Hz
Noise Voltage
Turn-On Settling Time
Capacitive-Load Stability Range
INPUT
Supply Voltage Range
Quiescent Supply Current
e
OUT
t
R
C
LOAD
V
IN
I
IN
f = 1kHz, C
NR
= 0
f = 1kHz, C
NR
= 0.1µF
SYMBOL
V
IN
- V
OUT
DV
OUT
= 0.1%
I
SC
DV
OUT
/
cycle
DV
OUT
/
time
Short to GND
Short to IN
SO
µMAX
1000hr at T
A
= +25°C
SO
µMAX
CONDITIONS
I
OUT
= 10mA
I
OUT
= 5mA
MIN
(V
IN
= 5V, C
LOAD
= 0.1μF, I
OUT
= 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
TYP
0.06
0.12
160
20
35
80
20
100
1.45
75
45
C
NR
= 0.1µF
C
NR
= 0
1
20
0.1 to 10
2.7
380
12.6
550
725
MAX
0.2
0.4
UNITS
V
mA
ppm
ppm/
1000hr
µV
P-P
nV/√Hz
ms
µF
V
µA
To V
OUT
= 0.01% of
final value
No sustained oscillations
Guaranteed by line-regulation test
T
A
= -40°C to +125°C
T
A
= +25°C
(V
IN
= 5V, C
LOAD
= 0.1μF, I
OUT
= 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
OUTPUT
Output Voltage
Output Voltage Accuracy
V
OUT
T
A
= +25°C
Referred to V
OUT
,
T
A
= +25°C
T
A
= -40°C to
+85°C
T
A
= -40°C to
+125°C
3.0V ≤ V
IN
≤ 12.6V
2.800
A grade µMAX
B grade µMAX
A grade µMAX
B grade µMAX
A grade µMAX
B grade µMAX
T
A
= +25°C
T
A
= -40°C to +125°C
-0.06
-0.10
1
2
2
3
3.5
1.3
2.4
0.06
0.12
+0.06
+0.10
3
7
5
12
23
45
28
28
0.2
0.4
µV/V
µV/mA
V
ppm/°C
V
%
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Electrical Characteristics—MAX6126_28 (V
OUT
= 2.800V)
Output Voltage Temperature
Coefficient (Note 1)
TCV
OUT
Line Regulation
Load Regulation
Dropout Voltage (Note 3)
DV
OUT
/
DV
IN
DV
OUT
/
DV
IN
Sourcing: 0 ≤ I
OUT
≤ 10mA
Sinking: -10mA ≤ I
OUT
≤ 0
V
IN
- V
OUT
DV
OUT
= 0.1%
I
OUT
= 10mA
I
OUT
= 5mA
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Maxim Integrated
│
4
MAX6126
Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
(V
IN
= 5V, C
LOAD
= 0.1μF, I
OUT
= 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
OUT Short-Circuit Current
Thermal Hysteresis (Note 2)
Long-Term Stability
DYNAMIC CHARACTERISTICS
f = 0.1Hz to 10Hz
Noise Voltage
Turn-On Settling Time
Capacitive-Load Stability Range
INPUT
Supply Voltage Range
Quiescent Supply Current
e
OUT
t
R
C
LOAD
V
IN
I
IN
f = 1kHz, C
NR
= 0
f = 1kHz, C
NR
= 0.1µF
1.45
75
45
1
20
0.1 to 10
3.0
380
12.6
550
725
µV
P-P
nV/√Hz
ms
µF
V
µA
SYMBOL
I
SC
DV
OUT
/
cycle
DV
OUT
/
time
Short to GND
Short to IN
µMAX
1000hr at T
A
= +25°C
µMAX
CONDITIONS
MIN
TYP
160
20
80
100
MAX
UNITS
mA
ppm
ppm/
1000hr
Electrical Characteristics—MAX6126_28 (V
OUT
= 2.800V)
(continued)
To V
OUT
= 0.01% of C
NR
= 0
final value
C
NR
= 0.1µF
No sustained oscillations
Guaranteed by line-regulation test
T
A
= +25°C
T
A
= -40°C to +125°C
Electrical Characteristics—MAX6126_30 (V
OUT
= 3.000V)
PARAMETER
OUTPUT
Output Voltage
Output Voltage Accuracy
V
OUT
T
A
= +25°C
Referred to V
OUT
,
T
A
= +25°C
SYMBOL
CONDITIONS
(V
IN
= 5V, C
LOAD
= 0.1μF, I
OUT
= 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
MIN
TYP
3.000
A grade SO
B grade SO
A grade µMAX
B grade µMAX
A grade SO
T
A
= -40°C to
+85°C
Output Voltage Temperature
Coefficient (Note 1)
TCV
OUT
T
A
= -40°C to
+125°C
B grade SO
A grade µMAX
B grade µMAX
A grade SO
B grade SO
A grade µMAX
B grade µMAX
-0.02
-0.06
-0.06
-0.1
0.5
1
1
2
1
2
2
3
+0.02
+0.06
+0.06
+0.1
3
5
3
7
5
10
5
12
ppm/°C
%
MAX
UNITS
V
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│
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