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MAX6226
Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
General Description
The MAX6226 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 5ppm/°C
(max) temperature coefficients and an excellent ±0.02%
(max) initial accuracy. The proprietary low-noise reference
architecture produces a low flicker noise of 1.45μVP-P and
wideband noise as low as 75nV/√Hz (2.5V output) without
the increased supply current usually found in low-noise
references. Improve wideband noise to 45nV/√Hz and AC
power-supply rejection by adding a 0.1μF capacitor at the
noise reduction pin. The MAX6226 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 0.25Ω and 0.05Ω for sink and source currents up
to 10mA, respectively. These devices are available over the
automotive temperature range of -40°C to +125°C.
The MAX6226 typically draws 380μA of supply current
and the output voltage is 2.5V. The MAX6226 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 MAX6226
offers supply current that is virtually independent of
supply voltage and does not require an external resistor. The
MAX6226 is stable with 0.1μF to 10μF of load capacitance,
and is available in an 8-pin ceramic package.
Benefits and Features
●● 8-pin Hermetically Sealed Ceramic Package
Reduces System Board Space
●● Ultra-Low 1.45μVP-P Noise (0.1Hz to 10Hz, 2.5V Output)
●● Ultra-Low 5ppm/°C (Max) Temperature Coefficient
●● ±0.02% (Max) Initial Accuracy
●● Wide (VOUT + 200mV) to 12.6V Supply Voltage Range
●● Low 200mV (Max) Dropout Voltage
●● 380μA Quiescent Supply Current
●● 10mA Sink/Source-Current Capability
●● Stable with CLOAD = 0.1μF to 10μF
●● Low 11ppm/1000hr Long-Term Drift
●● 0.05Ω (Max) Load Regulation
●● 25μV/V (Max) Line Regulation
●● Force and Sense Outputs for Remote Sensing
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
Ordering Information appears at end of data sheet.
Typical Operating Circuit
(VOUT + 200mV) TO 12.6V INPUT
*
NR
*
IN
OUTF
MAX6226 OUTS
GND
*OPTIONAL.
REFERENCE
OUTPUT
LOAD
LONG-TERM STABILITY vs. TIME
20
(MAX6226ALA25+)
toc16
15 THREE TYPICAL UNITS
10
5
0
-5
0 200 400 600 800 1000
DURATION (HOURS)
19-100454; Rev 4; 12/19
