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General Description
The MAX6126 is an ultra-low-noise, high-precision, low-
dropout voltage reference. This family of voltage refer-
ences 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 propri-
etary low-noise reference architecture produces a low
flicker noise of 1.3V
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 0.1F 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 guaran-
teed to be less than 0.025
for sink and source cur-
rents up to 10mA. These devices are available over the
automotive temperature range of -40C to +125C.
The MAX6126 typically draws 380A of supply current
and is available in 2.048V, 2.500V, 3.000V, 4.096V, and
5.000V output voltages. These devices 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 resis-
tor. The MAX6126 is stable with 0.1F to 10F of load
capacitance.
The MAX6126 is available in the tiny 8-pin MAX, as
well as 8-pin SO packages.
Applications
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
Features
o Ultra-Low 1.3V
P-P
Noise (0.1Hz to 10Hz, 2.048V
Output)
o Ultra-Low 3ppm/C (max) Temperature Coefficient
o 0.02% (max) Initial Accuracy
o Wide (V
OUT
+ 200mV) to 12.6V Supply Voltage
Range
o Low 200mV (max) Dropout Voltage
o 380A Quiescent Supply Current
o 10mA Sink/Source-Current Capability
o Stable with C
LOAD
= 0.1F to 10F
o Low 20ppm/1000hr Long-Term Stability
o 0.025 (max) Load Regulation
o 20V/V (max) Line Regulation
o Force and Sense Outputs for Remote Sensing
MAX6126
Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
________________________________________________________________ Maxim Integrated Products
1
OUTS
I.C.*
GNDS
1
2
8
7
I.C.*
OUTF
IN
GND
NR
SO/
MAX
TOP VIEW
3
4
6
5
MAX6126
*I.C. = INTERNALLY CONNECTED. DO NOT USE.
Pin Configuration
Ordering Information
19-2647; Rev 2; 6/03
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.
PART
TEMP RANGE
PIN-
PACKAGE
OUTPUT
VOLTAGE
(V)
MAXIMUM INITIAL
ACCURACY (%)
MAXIMUM TEMPCO
(-40C to +85C)
(ppm/C)
TOP
MARK
MAX6126AASA21
-40
C to +125C
8 SO
2.048
0.02
3
--
MAX6126BASA21
-40
C to +125C
8 SO
2.048
0.06
5
--
MAX6126AAUA21
-40
C to +125C
8 MAX
2.048
0.06
3
6126A21
Ordering Information continued at end of data sheet.
MAX6126
Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
(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
= +70C)
8-Pin MAX (derate 4.5mW/C above +70C) ............362mW
8-Pin SO (derate 5.88mW/C above +70C) ...............471mW
Operating Temperature Range ........................-40C to +125C
Junction Temperature .....................................................+150C
Storage Temperature Range ............................-65C to +150C
Lead Temperature (soldering, 10s) ................................+300C
ELECTRICAL CHARACTERISTICS--MAX6126_21 (V
OUT
= 2.048V)
(V
IN
= 5V, C
LOAD
= 0.1F, I
OUT
= 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
OUTPUT
Output Voltage
V
OUT
T
A
= +25
C
2.048
V
A grade SO
-0.02
+0.02
B grade SO
-0.06
+0.06
A grade MAX
-0.06
+0.06
Output Voltage Accuracy
Referred to
V
OUT
,
T
A
= +25
C
B grade MAX
-0.1
+0.1
%
A grade SO
0.5
3
B grade SO
1
5
A grade MAX
1
3
T
A
= -40
C
to +85
C
B grade MAX
2
7
A grade SO
1
5
B grade SO
2
10
A grade MAX
2
5
Output Voltage Temperature
Coefficient (Note 1)
TCV
OUT
T
A
= -40
C
to +125
C
B grade MAX
3
12
ppm/
C
T
A
= +25
C
2
20
Line Regulation
V
OUT
/
V
IN
2.7V
V
IN
12.6V
T
A
= -40
C to +125C
40
V/V
Sourcing: 0
I
OUT
10mA
0.7
25
Load Regulation
V
OUT
/
I
OUT
Sinking: -10mA
I
OUT
0
1.3
25
V/mA
Short to GND
160
OUT Short-Circuit Current
I
SC
Short to IN
20
mA
SO
25
Thermal Hysteresis (Note 2)
V
OUT
/
cycle
MAX
80
ppm
SO
20
Long-Term Stability
V
OUT
/
time
1000hr at T
A
= +25
C
MAX
100
ppm/
1000hr
MAX6126
Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS--MAX6126_21 (V
OUT
= 2.048V) (continued)
(V
IN
= 5V, C
LOAD
= 0.1F, I
OUT
= 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DYNAMIC CHARACTERISTICS
f = 0.1Hz to 10Hz
1.3
V
P-P
f = 1kHz, C
NR
= 0
60
Noise Voltage
e
OUT
f = 1kHz, C
NR
= 0.1F
35
nV/
Hz
C
NR
= 0
0.8
Turn-On Settling Time
t
R
To V
OUT
= 0.01% of
final value
C
NR
= 0.1F
20
ms
Capacitive-Load Stability Range
C
LOAD
No sustained oscillations
0.1 to 10
F
INPUT
Supply Voltage Range
V
IN
Guaranteed by line-regulation test
2.7
12.6
V
T
A
= +25
C
380
550
Quiescent Supply Current
I
IN
T
A
= -40
C to +125C
725
A
ELECTRICAL CHARACTERISTICS--MAX6126_25 (V
OUT
= 2.500V)
(V
IN
= 5V, C
LOAD
= 0.1F, I
OUT
= 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
OUTPUT
Output Voltage
V
OUT
T
A
= +25
C
2.500
V
A grade SO
-0.02
+0.02
B grade SO
-0.06
+0.06
A grade MAX
-0.06
+0.06
Output Voltage Accuracy
Referred to V
OUT
,
T
A
= +25
C
B grade MAX
-0.1
+0.1
%
A grade SO
0.5
3
B grade SO
1
5
A grade MAX
1
3
T
A
= -40
C to +85C
B grade MAX
2
7
A grade SO
1
5
B grade SO
2
10
A grade MAX
2
5
Output Voltage Temperature
Coefficient (Note 1)
TCV
OUT
T
A
= -40
C to
+125
C
B grade MAX
3
12
ppm/
C
T
A
= +25
C
3
20
Line Regulation
V
OUT
/
V
IN
2.7V
V
IN
12.6V
T
A
= -40
C to +125C
40
V/V
Sourcing: 0
I
OUT
10mA
1
25
Load Regulation
V
OUT
/
I
OUT
Sinking: -10mA
I
OUT
0
1.8
25
V/mA
MAX6126
Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
4
_______________________________________________________________________________________
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
I
OUT
= 5mA
0.06
0.2
Dropout Voltage (Note 3)
V
IN
- V
OUT
V
OUT
= 0.1%
I
OUT
= 10mA
0.12
0.4
V
Short to GND
160
OUT Short-Circuit Current
I
SC
Short to IN
20
mA
SO
35
Thermal Hysteresis (Note 2)
V
OUT
/
cycle
MAX
80
ppm
SO
20
Long-Term Stability
V
OUT
/
time
1000hr at T
A
= +25
C
MAX
100
ppm/
1000hr
DYNAMIC CHARACTERISTICS
f = 0.1Hz to 10Hz
1.45
V
P-P
f = 1kHz, C
NR
= 0
75
Noise Voltage
e
OUT
f = 1kHz, C
NR
= 0.1F
45
nV/
Hz
C
NR
= 0
1
Turn-On Settling Time
t
R
To V
OUT
= 0.01% of
final value
C
NR
= 0.1F
20
ms
Capacitive-Load Stability Range
C
LOAD
No sustained oscillations
0.1 to 10
F
INPUT
Supply Voltage Range
V
IN
Guaranteed by line-regulation test
2.7
12.6
V
T
A
= +25
C
380
550
Quiescent Supply Current
I
IN
T
A
= -40
C to +125C
725
A
ELECTRICAL CHARACTERISTICS--MAX6126_25 (V
OUT
= 2.500V) (continued)
(V
IN
= 5V, C
LOAD
= 0.1F, I
OUT
= 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
OUTPUT
Output Voltage
V
OUT
T
A
= +25
C
3.000
V
A grade SO
-0.02
+0.02
B grade SO
-0.06
+0.06
A grade MAX
-0.06
+0.06
Output Voltage Accuracy
Referred to V
OUT
,
T
A
= +25
C
B grade MAX
-0.1
+0.1
%
A grade SO
0.5
3
B grade SO
1
5
A grade MAX
1
3
T
A
= -40
C to
+85
C
B grade MAX
2
7
A grade SO
1
5
B grade SO
2
10
A grade MAX
2
5
Output Voltage Temperature
Coefficient (Note 1)
TCV
OUT
T
A
= -40
C to
+125
C
B grade MAX
3
12
ppm/
C
ELECTRICAL CHARACTERISTICS--MAX6126_30 (V
OUT
= 3.000V)
(V
IN
= 5V, C
LOAD
= 0.1F, I
OUT
= 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.)
MAX6126
Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
_______________________________________________________________________________________
5
ELECTRICAL CHARACTERISTICS--MAX6126_30 (V
OUT
= 3.000V) (continued)
(V
IN
= 5V, C
LOAD
= 0.1F, I
OUT
= 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
T
A
= +25
C
4
25
Line Regulation
V
OUT
/
V
IN
3.2V
V
IN
12.6V
T
A
= -40
C to +125C
50
V/V
Sourcing: 0
I
OUT
10mA
1.5
30
Load Regulation
V
OUT
/
I
OUT
Sinking: -10mA
I
OUT
0
2.8
30
V/mA
I
OUT
= 5mA
0.06
0.2
Dropout Voltage (Note 3)
V
IN
- V
OUT
V
OUT
= 0.1%
I
OUT
= 10mA
0.11
0.4
V
Short to GND
160
OUT Short-Circuit Current
I
SC
Short to IN
20
mA
SO
20
Thermal Hysteresis (Note 2)
V
OUT
/
cycle
MAX
80
ppm
SO
20
Long-Term Stability
V
OUT
/
time
1000hr at T
A
= +25
C
MAX
100
ppm/
1000hr
DYNAMIC CHARACTERISTICS
f = 0.1Hz to 10Hz
1.75
V
P-P
f = 1kHz, C
NR
= 0
90
Noise Voltage
e
OUT
f = 1kHz, C
NR
= 0.1F
55
nV/
Hz
Capacitive-Load Stability Range
C
LOAD
No sustained oscillations
0.1 to 10
F
C
NR
= 0
1.2
Turn-On Settling Time
t
R
To V
OUT
= 0.01%
of final value
C
NR
= 0.1F
20
ms
INPUT
Supply Voltage Range
V
IN
Guaranteed by line-regulation test
3.2
12.6
V
T
A
= +25
C
380
550
Quiescent Supply Current
I
IN
T
A
= -40
C to +125C
725
A
ELECTRICAL CHARACTERISTICS--MAX6126_41 (V
OUT
= 4.096V)
(V
IN
= 5V, C
LOAD
= 0.1F, I
OUT
= 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
OUTPUT
Output Voltage
V
OUT
T
A
= +25
C
4.096
V
A grade SO
-0.02
+0.02
B grade SO
-0.06
+0.06
A grade MAX
-0.06
+0.06
Output Voltage Accuracy
Referred to V
OUT
,
T
A
= +25
C
B grade MAX
-0.1
+0.1
%
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