MAXIM MAX6126 Technical data

General Description

The MAX6126 is an ultra-low-noise, high-precision, low­dropout 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,

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 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.

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 1.3µV

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 380µA Quiescent Supply Current

o 10mA Sink/Source-Current Capability

o Stable with C

LOAD

= 0.1µF to 10µF

o Low 20ppm/1000hr Long-Term Stability

o 0.025Ω (max) Load Regulation

o 20µV/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

Pin Configuration

Ordering Information

19-2647; Rev 5; 12/10

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

Ordering Information continued at end of data sheet.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

+

Denotes a lead(Pb)-free/RoHS-compliant package.

TOP VIEW

NR

GND

*I.C. = INTERNALLY CONNECTED. DO NOT USE.

+

1

2

MAX6126

3

4

SO/µMAX

8

I.C.*

7

OUTFIN

OUTS

6

I.C.*GNDS

5

PART TEMP RANGE

MAX6126AASA21+ -40°C to +125°C 8 SO 2.048 0.02 3 —
MAX6126BASA21+ -40°C to +125°C 8 SO 2.048 0.06 5 —
MAX6126A21+ -40°C to +125°C 8 µMAX 2.048 0.06 3 6126A21

PIN­PACKAGE

OUTPUT

VOLTAGE

(V)

MAXIMUM INITIAL

ACCURACY (%)

MAXIMUM TEMPCO

(-40°C to +85°C)

(ppm/°C)

TOP

MARK

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

= +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

ELECTRICAL CHARACTERISTICS—MAX6126_21 (V

OUT

= 2.048V)

(VIN= 5V, C

LOAD

= 0.1µF, I

OUT

= 0, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

OUTPUT

Output Voltage V

Output Voltage Accuracy

Output Voltage Temperature
Coefficient (Note 1)

Line Regulation

Load Regulation

OUT Short-Circuit Current I

Thermal Hysteresis (Note 2)

Long-Term Stability

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

T

OUT

= +25°C 2.048 V

A

A grade SO -0.02 +0.02

Referred to
V

,

OUT

= +25°C

T

A

B grade SO -0.06 +0.06

A grade µMAX -0.06 +0.06

B grade µMAX -0.1 +0.1

A grade SO 0.5 3

B grade SO 1 5

A grade µMAX 1 3

B grade µMAX 2 7

A grade SO 1 5

B grade SO 2 10

A grade µMAX 2 5

TCV

OUT

T

= -40°C

A

to +85°C

T

= -40°C

A

to +125°C

B grade µMAX 3 12

T

= +25°C220

∆V

/

OUT

∆V

∆V

OUT

∆I

OUT Sinking: -10mA ≤ I

SC

∆V

OUT

cycle

∆V

OUT

time

2.7V ≤ VIN ≤

12.6V

IN

Sourcing: 0 ≤ I

/

Short to GND 160

Short to IN 20

SO 25

/

µMAX 80

/

1000hr at T

A

= -40°C to +125°C40

T

A

≤ 10mA 0.7 25

OUT

≤ 0 1.3 25

OUT

= +25°C

A

SO 20

µMAX 100

%

ppm/°C

µV/V

µV/mA

mA

ppm

ppm/

1000hr

MAX6126

Ultra-High-Precision, Ultra-Low-Noise,

Series Voltage Reference

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS—MAX6126_21 (V

OUT

= 2.048V) (continued)

(VIN= 5V, C

LOAD

= 0.1µF, I

OUT

= 0, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

ELECTRICAL CHARACTERISTICS—MAX6126_25 (V

OUT

= 2.500V)

(VIN= 5V, C

LOAD

= 0.1µF, I

OUT

= 0, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

DYNAMIC CHARACTERISTICS

Noise Voltage e

Turn-On Settling Time t

Capacitive-Load Stability Range C

INPUT

Supply Voltage Range V

Quiescent Supply Current I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

OUT

R

LOAD

IN

IN

f = 0.1Hz to 10Hz 1.3 µV

f = 1kHz, CNR = 0 60

f = 1kHz, CNR = 0.1µF 35

To V
final value

No sustained oscillations 0.1 to 10 µF

Guaranteed by line-regulation test 2.7 12.6 V

T

T

= 0.01% of

OUT

= +25°C 380 550

A

= -40°C to +125°C 725

A

OUTPUT

Output Voltage V

Output Voltage Accuracy

Output Voltage Temperature
Coefficient (Note 1)

Line Regulation

Load Regulation

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

TCV

∆V

∆V

∆V

∆I

OUT

OUT

/

OUT

IN

/

OUT
OUT Sinking: -10mA ≤ I

TA = +25°C 2.500 V

Referred to V
T

= +25°C

A

TA = -40°C to +85°C

TA = -40°C to
+125°C

2.7V ≤ VIN ≤ 12.6V

Sourcing: 0 ≤ I

OUT

OUT

A grade SO -0.02 +0.02

B grade SO -0.06 +0.06

,

A grade µMAX -0.06 +0.06

B grade µMAX -0.1 +0.1

A grade SO 0.5 3

B grade SO 1 5

A grade µMAX 1 3

B grade µMAX 2 7

A grade SO 1 5

B grade SO 2 10

A grade µMAX 2 5

B grade µMAX 3 12

TA = +25°C320

T

= -40°C to +125°C40

A

≤ 10mA 1 25

≤ 0 1.8 25

OUT

CNR = 0 0.8

C

= 0.1µF 20

NR

P-P

nV/√Hz

ms

µA

%

ppm/°C

µV/V

µV/mA

MAX6126

Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS—MAX6126_25 (V

OUT

= 2.500V) (continued)

(VIN= 5V, C

LOAD

= 0.1µF, I

OUT

= 0, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

ELECTRICAL CHARACTERISTICS—MAX6126_28 (V

OUT

= 2.800V)

(VIN= 5V, C

LOAD

= 0.1µF, I

OUT

= 0, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

Dropout Voltage (Note 3) VIN - V

OUT Short-Circuit Current I

Thermal Hysteresis (Note 2)

Long-Term Stability

DYNAMIC CHARACTERISTICS

Turn-On Settling Time t

Capacitive-Load Stability Range C

INPUT

Supply Voltage Range V

Quiescent Supply Current I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

∆V

cycle

∆V

time

OUT∆VOUT

SC

/

OUT

/

OUT

OUT

R

LOAD

IN

IN

= 0.1%

Short to GND 160

Short to IN 20

SO 35

µMAX 80

1000hr at T

f = 0.1Hz to 10Hz 1.45 µV

f = 1kHz, CNR = 0 75Noise Voltage e

f = 1kHz, CNR = 0.1µF 45

To V

OUT

final value

No sustained oscillations 0.1 to 10 µF

Guaranteed by line-regulation test 2.7 12.6 V

TA = +25°C 380 550

TA = -40°C to +125°C 725

= +25°C

A

= 0.01% of

I

= 5mA 0.06 0.2

OUT

I

= 10mA 0.12 0.4

OUT

SO 20

µMAX 100

CNR = 0 1

C

= 0.1µF 20

NR

V

mA

ppm

ppm/

1000hr

P-P

nV/√Hz

ms

µA

OUTPUT

Output Voltage V

Output Voltage Accuracy

Output Voltage Temperature
Coefficient (Note 1)

Line Regulation ∆V

Load Regulation ∆V

Dropout Voltage (Note 3) VIN - V

PARAMETER SYMBOL CONDTIONS MIN TYP MAX UNITS

TCV

OUT

OUT

/∆VIN3.0V ≤ VIN ≤ 12.6V

OUT

/∆V

OUT

OUT

TA = +25°C 2.800 V

Referred to VOUT, T
+25°C

TA = -40°C to +85°C

TA = -40°C to +125°C

Sourcing: 0 ≤ I

IN

Sinking: -10mA ≤ I

∆V

= 0.1%

OUT

=

A

≤ 10mA 1.3 28

OUT

≤ 0 2.4 28

OUT

A grade µMAX -0.06 +0.06

B grade µMAX -0.10 +0.10

A grade µMAX 1 3

B grade µMAX 2 7

A grade µMAX 2 5

B grade µMAX 3 12

TA = +25°C 3.5 23

= -40°C to

T

A

+125°C

I

= 5mA 0.06 0.2

OUT

= 10mA 0.12 0.4

I

OUT

45

%

ppm/°C

µV/V

µV/mA

V

MAX6126

Ultra-High-Precision, Ultra-Low-Noise,

Series Voltage Reference

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS—MAX6126_28 (V

OUT

= 2.800V) (continued)

(VIN= 5V, C

LOAD

= 0.1µF, I

OUT

= 0, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

ELECTRICAL CHARACTERISTICS—MAX6126_30 (V

OUT

= 3.000V)

(VIN= 5V, C

LOAD

= 0.1µF, I

OUT

= 0, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

OUT Short-Circuit Current I

Thermal Hysteresis (Note 2) ∆V

Long-Term Stability ∆V

DYNAMIC CHARACTERISTICS

Noise Voltage e

Turn-On Settling Time t

Capacitive-Load Stability Range C

INPUT

Supply Voltage Range V

Quiescent Supply Current I

PARAMETER SYMBOL CONDTIONS MIN TYP MAX UNITS

OUT

SC

/cycle µMAX 80 ppm

/time 1000hr at TA = +25°C µMAX 100

OUT

OUT

R

LOAD

IN

IN

Short to GND 160

Short to IN 20

f = 0.1Hz to 10Hz 1.45 µV

f = 1kHz, CNR = 0 75

f = 1kHz, CNR = 0.1µF 45

To V
final value

No sustained oscillations 0.1 to 10 µF

Guaranteed by line-regulation test 3.0 12.6 V

TA = +25°C 380 550

TA = -40°C to +125°C 725

= 0.01% of

OUT

CNR = 0 1

= 0.1µF 20

C

NR

mA

ppm/

1000hr

P-P

nV/√Hz

ms

µA

OUTPUT

Output Voltage V

Output Voltage Accuracy

Output Voltage Temperature
Coefficient (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

TCV

OUT

OUT

TA = +25°C 3.000 V

A grade SO -0.02 +0.02

Referred to V
T

= +25°C

A

TA = -40°C to
+85°C

TA = -40°C to
+125°C

OUT

B grade SO -0.06 +0.06

,

A grade µMAX -0.06 +0.06

B grade µMAX -0.1 +0.1

A grade SO 0.5 3

B grade SO 1 5

A grade µMAX 1 3

B grade µMAX 2 7

A grade SO 1 5

B grade SO 2 10

A grade µMAX 2 5

B grade µMAX 3 12

%

ppm/°C

MAX6126

Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference

6 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS—MAX6126_30 (V

OUT

= 3.000V) (continued)

(VIN= 5V, C

LOAD

= 0.1µF, I

OUT

= 0, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

ELECTRICAL CHARACTERISTICS—MAX6126_41 (V

OUT

= 4.096V)

(VIN= 5V, C

LOAD

= 0.1µF, I

OUT

= 0, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

Line Regulation

Load Regulation

Dropout Voltage (Note 3) VIN - V

OUT Short-Circuit Current I

Thermal Hysteresis (Note 2)

Long-Term Stability

DYNAMIC CHARACTERISTICS

Noise Voltage e

Capacitive-Load Stability Range C

Turn-On Settling Time t

INPUT

Supply Voltage Range V

Quiescent Supply Current I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

∆V

∆V

∆I

∆V

cycle

∆V

/

OUT

∆V

IN

/

OUT

OUT

OUT∆VOUT

SC

/

OUT

/

OUT

time

OUT

LOAD

R

IN

IN

3.2V ≤ VIN ≤ 12.6V

Sourcing: 0 ≤ I
Sinking: -10mA ≤ I

Short to GND 160

Short to IN 20

SO 20

µMAX 80

1000hr at T

f = 0.1Hz to 10Hz 1.75 µV

f = 1kHz, CNR = 0 90

f = 1kHz, CNR = 0.1µF 55

No sustained oscillations 0.1 to 10 µF

To V

OUT

of final value

Guaranteed by line-regulation test 3.2 12.6 V

TA = +25°C 380 550

TA = -40°C to +125°C 725

= 0.1%

A

= 0.01%

OUT

= +25°C

TA = +25°C425

= -40°C to +125°C50

T

A

≤ 10mA 1.5 30

≤ 0 2.8 30

OUT

I

= 5mA 0.06 0.2

OUT

I

= 10mA 0.11 0.4

OUT

SO 20

µMAX 100

CNR = 0 1.2

= 0.1µF 20

C

NR

µV/V

µV/mA

V

mA

ppm

ppm/

1000hr

P-P

nV/√Hz

ms

µA

OUTPUT

Output Voltage V

Output Voltage Accuracy

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

OUT

TA = +25°C 4.096 V

A grade SO -0.02 +0.02

Referred to V
T

= +25°C

A

OUT

B grade SO -0.06 +0.06

,

A grade µMAX -0.06 +0.06

B grade µMAX -0.1 +0.1

%