19-2647; Rev 2; 6/03
Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
General Description
Features
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 ±±.±2ꢀ (max) initial accuracy. The propri-
etary low-noise reference architecture produces a low
ꢀ Ultra-Low 1.3µV
Noise (0.1Hz to 10Hz, 2.048V
P-P
Output)
ꢀ Ultra-Low 3ppm/°C (max) Temperature Coefficient
0.02ꢀ (max) ꢁnitial ꢂccuracꢃ
ꢀ
ꢀ Wide (V
+ 200mV) to 12.6V Supplꢃ Voltage
OUT
flicker noise of 1.3µV
and wideband noise as low as
Range
P-P
6±nV/√Hz (2.±48V 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 ±.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 ±.±25Ω for sink and source cur-
rents up to 1±mA. These devices are available over the
automotive temperature range of -4±°C to +125°C.
ꢀ Low 200mV (max) Dropout Voltage
ꢀ 380µꢂ Quiescent Supplꢃ Current
ꢀ 10mꢂ Sink/Source-Current Capabilitꢃ
ꢀ Stable with C
= 0.1µF to 10µF
LOꢂD
ꢀ Low 20ppm/1000hr Long-Term Stabilitꢃ
ꢀ 0.025Ω (max) Load Regulation
ꢀ 20µV/V (max) Line Regulation
The MAX6126 typically draws 38±µA of supply current
and is available in 2.±48V, 2.5±±V, 3.±±±V, 4.±96V, and
5.±±±V output voltages. These devices also feature
dropout voltages as low as 2±±mV. 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 ±.1µF to 1±µF of load
capacitance.
ꢀ Force and Sense Outputs for Remote Sensing
Pin Configuration
TOP VIEW
NR
IN
1
2
3
4
8
7
6
5
I.C.*
The MAX6126 is available in the tiny 8-pin µMAX, as
well as 8-pin SO packages.
OUTF
OUTS
I.C.*
MAX6126
GND
GNDS
Applications
High-Resolution A/D and D/A Converters
ATE Equipment
SO/µMAX
High-Accuracy Reference Standard
Precision Current Sources
*I.C. = INTERNALLY CONNECTED. DO NOT USE.
Digital Voltmeters
High-Accuracy Industrial and Process Control
Ordering Information
OUTPUT
VOLTAGE
(V)
MAXIMUM TEMPCO
(-40°C to +85°C)
(ppm/°C)
PIN-
PACKAGE
MAXIMUM INITIAL
ACCURACY (%)
TOP
MARK
PART
TEMP RANGE
—
—
MAX6126AASA21
MAX6126BASA21
MAX6126AAUA21
-40 C to +125 C
-40 C to +125 C
-40 C to +125 C
8 SO
2.048
2.048
2.048
0.02
0.06
0.06
3
5
3
8 SO
6126A21
8 µMAX
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.
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