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REF192ESZ-REEL

2.5V precision Vref, +/-2mV, 2ppm/C, 45uA Iq, 30mA out, sleep mode, SOIC-8

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Manufacturer Part：

REF192ESZ-REEL

Package：

SOIC-8 Narrow (4.90 x 3.91 x 1.50 mm)

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Description

Product Overview

The REF192ESZ-REEL from Analog Devices is a 2.5V precision micropower low-dropout voltage reference with +/-2mV initial accuracy and 2ppm/°C temperature coefficient. Featuring 45uA supply current, 30mA output capability, and sleep mode in an 8-pin SOIC package.

Key Specifications

Output Voltage 2.5 V
Initial Accuracy +/-2 mV (E grade, 0.08%)
Temperature Coefficient 2 ppm/°C (E grade)
Supply Current 45 uA max (operating)
Sleep Mode Current 15 uA max
Output Current 30 mA (max)
Dropout Voltage 0.8 V @ 10mA
Line Regulation 2-4 ppm/V
Load Regulation 4-10 ppm/mA
Noise (0.1-10Hz) 33 uV p-p
Long-Term Stability 1.2 mV / 1000 hrs @ 125°C
Input Voltage Up to 15 V
Operating Temperature -40°C to +85°C
Package SOIC-8 (Narrow)

Features

  • 2.5V precision reference with +/-2mV initial accuracy and 2ppm/°C drift
  • Micropower 45uA supply current with 15uA sleep mode for battery applications
  • Low 0.8V dropout voltage enables operation from supplies barely above 2.5V
  • 30mA output current capability for driving ADC/DAC reference inputs
  • Patented temperature drift curvature correction for excellent stability

Applications

  • Precision ADC and DAC voltage reference in portable instruments
  • Smart sensor and loop-current-powered instrument reference
  • Solar-powered and battery-operated precision measurement systems

The REF192ESZ-REEL from Analog Devices is a precision micropower low-dropout voltage reference providing a fixed 2.5V output. The REF19x series uses a patented temperature drift curvature correction circuit and laser-trimmed thin-film resistors to achieve very low temperature coefficient and high initial accuracy. The E-grade device offers +/-2mV initial accuracy (0.08%) and 2ppm/C temperature coefficient over the -40C to +85C range. The device operates from supplies as low as 3.3V (0.8V dropout at 10mA) and draws only 45uA maximum supply current. A SLEEP pin allows the output to be disabled, reducing supply current to 15uA maximum. The output can source up to 30mA with short-circuit protection. The output requires a 1uF capacitor for stability. The device is ideal for precision ADC/DAC references, smart sensors, and battery-powered instruments where low power consumption and high accuracy are critical.

The REF192ESZ-REEL is a series-mode bandgap voltage reference. (1) Bandgap Core: The core circuit generates a stable 2.5V output by summing a PTAT (proportional to absolute temperature) voltage with a complementary-to-absolute-temperature (CTAT) voltage from a forward-biased diode. When properly trimmed, the temperature coefficients cancel, producing a nearly flat VOUT vs. temperature characteristic. (2) Curvature Correction: The patented curvature correction circuit adds a higher-order temperature compensation term that corrects for the nonlinear residual temperature drift of the basic bandgap, reducing the temperature coefficient to 2ppm/C. (3) Laser Trimming: Thin-film resistors are laser-trimmed during manufacturing to achieve the +/-2mV initial accuracy at 25C. (4) Sleep Mode: When the SLEEP pin is driven low (below 0.8V), the output stage is disabled and the supply current drops to 15uA maximum. This is useful for power-cycled applications. (5) Output: The series architecture allows the output to source up to 30mA. The output impedance is very low, providing excellent load regulation of 4-10 ppm/mA.

Pin Name Function
1 VIN Supply voltage input (up to 15V)
2 GND Ground
3 SLEEP Sleep mode control (low = sleep)
4,5 GND Ground (no connect or tie to GND)
6 VOUT 2.5V reference output (1uF cap required)
7 GND Ground
8 GND Ground
  • Precision ADC/DAC 2.5V reference in portable and battery-powered instruments
  • Smart sensor voltage reference with sleep mode for power cycling
  • Loop-current-powered and solar-powered precision measurement reference
Manufacturer Part Number Package Notes
ADI REF192GSZ-REEL SOIC-8 G grade, 25ppm/C, lower cost
TI REF3025AIDBZR SOT-23-3 2.5V, 50ppm/C, smaller
TI REF3125IDBZR SOT-23-3 2.5V, 10ppm/C, low Iq
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