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19-2647; Rev 4; 7/04
Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
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 1.3µV
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 guaran-
teed to be less than 0.025Ω for sink and source cur-
rents 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, 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 0.1µF to 10µF of load
capacitance.
The MAX6126 is available in the tiny 8-pin µMAX, as
well as 8-pin SO packages.
Features
♦
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
MAX6126
Pin Configuration
TOP VIEW
NR
IN
GND
1
2
8
7
I.C.*
OUTF
OUTS
I.C.*
MAX6126
3
6
5
GNDS
4
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
SO/µMAX
*I.C. = INTERNALLY CONNECTED. DO NOT USE.
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
TOP
MARK
—
—
6126A21
Ordering Information continued at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
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.
Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
MAX6126
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
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—MAX6126_21 (V
OUT
= 2.048V)
(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
V
OUT
T
A
= +25°C
A grade SO
Output Voltage Accuracy
Referred to
V
OUT
,
T
A
= +25°C
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
∆V
OUT
/
∆V
IN
∆V
OUT
/
∆I
OUT
I
SC
∆V
OUT
/
cycle
∆V
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
= +25°C
T
A
= -40°C to +125°C
0.7
1.3
160
20
25
80
SO
µMAX
20
100
-0.02
-0.06
-0.06
-0.1
0.5
1
1
2
1
2
2
3
2
2.048
+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
Sourcing: 0
≤
I
OUT
≤
10mA
Sinking: -10mA
≤
I
OUT
≤
0
Short to GND
Short to IN
SO
µMAX
1000hr at T
A
= +25°C
2
_______________________________________________________________________________________
Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
ELECTRICAL CHARACTERISTICS—MAX6126_21 (V
OUT
= 2.048V) (continued)
(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
e
OUT
f = 1kHz, C
NR
= 0
f = 1kHz, C
NR
= 0.1µF
Turn-On Settling Time
Capacitive-Load Stability Range
INPUT
Supply Voltage Range
Quiescent Supply Current
V
IN
I
IN
Guaranteed by line-regulation test
T
A
= +25°C
T
A
= -40°C to +125°C
2.7
380
12.6
550
725
V
µA
t
R
C
LOAD
To V
OUT
= 0.01% of
final value
No sustained oscillations
C
NR
= 0
C
NR
= 0.1µF
1.3
60
35
0.8
20
0.1 to 10
µV
P-P
nV/√Hz
ms
µF
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX6126
ELECTRICAL CHARACTERISTICS—MAX6126_25 (V
OUT
= 2.500V)
(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
V
OUT
T
A
= +25°C
A grade SO
Output Voltage Accuracy
Referred to V
OUT
,
T
A
= +25°C
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
∆V
OUT
/
∆V
IN
∆V
OUT
/
∆I
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
1
1.8
-0.02
-0.06
-0.06
-0.1
0.5
1
1
2
1
2
2
3
3
2.500
+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
%
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Sourcing: 0
≤
I
OUT
≤
10mA
Sinking: -10mA
≤
I
OUT
≤
0
_______________________________________________________________________________________
3
Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
MAX6126
ELECTRICAL CHARACTERISTICS—MAX6126_25 (V
OUT
= 2.500V) (continued)
(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
Dropout Voltage (Note 3)
OUT Short-Circuit Current
Thermal Hysteresis (Note 2)
Long-Term Stability
DYNAMIC CHARACTERISTICS
f = 0.1Hz to 10Hz
Noise Voltage
e
OUT
f = 1kHz, C
NR
= 0
f = 1kHz, C
NR
= 0.1µF
Turn-On Settling Time
Capacitive-Load Stability Range
INPUT
Supply Voltage Range
Quiescent Supply Current
V
IN
I
IN
Guaranteed by line-regulation test
T
A
= +25°C
T
A
= -40°C to +125°C
2.7
380
12.6
550
725
V
µA
t
R
C
LOAD
To V
OUT
= 0.01% of
final value
No sustained oscillations
C
NR
= 0
C
NR
= 0.1µF
1.45
75
45
1
20
0.1 to 10
µV
P-P
nV/√Hz
ms
µF
SYMBOL
V
IN
- V
OUT
∆V
OUT
= 0.1%
I
SC
∆V
OUT
/
cycle
∆V
OUT
/
time
Short to GND
Short to IN
SO
µMAX
1000hr at T
A
= +25°C
SO
µMAX
CONDITIONS
I
OUT
= 5mA
I
OUT
= 10mA
MIN
TYP
0.06
0.12
160
20
35
80
20
100
MAX
0.2
0.4
UNITS
V
mA
ppm
ppm/
1000hr
ELECTRICAL CHARACTERISTICS—MAX6126_30 (V
OUT
= 3.000V)
(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
V
OUT
T
A
= +25°C
A grade SO
Output Voltage Accuracy
Referred to V
OUT
,
T
A
= +25°C
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
3.000
+0.02
+0.06
+0.06
+0.1
3
5
3
7
5
10
5
12
ppm/°C
%
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
4
_______________________________________________________________________________________
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