REF192ESZ

Due to market price fluctuations,if you need to purchase or consult the price.You can contact us or emial to us:   sales@allicdata.com

1. DESCRIPTION

The REF192ESZ series precision band gap voltage references use a patented temperature drift curvature correction circuit and laser trimming of highly stable, thin-film resistors to achieve a very low temperature coefficient and high initial accuracy. The REF19x series is made up of micropower, low dropout voltage (LDV) devices, providing stable output voltage from supplies as low as 100 mV above the output voltage and consuming less than 45 μA of supply current. In sleep mode, which is enabled by applying a low TTL or CMOS level to the SLEEP pin, the output is turned off and supply current is further reduced to less than 15 μA. The REF19x series references are specified over the extended industrial temperature range (−40°C to +85°C) with typical performance specifications over −40°C to +125°C for applications, such as automotive. All electrical grades are available in an 8-lead SOIC package; the PDIP and TSSOP packages are available only in the lowest electrical grade.

2. FEATURES

    1. Temperature coefficient: 5 ppm/°C maximum

    2. High output current: 30 mA

    3. Low supply current: 45 μA maximum

    4. Initial accuracy: ±2 mV maximum1

    5. Sleep mode: 15 μA maximum

    6. Low dropout voltage

    7. Load regulation: 4 ppm/mA

    8. Line regulation: 4 ppm/V

    9. Short-circuit protection

3. APPLICATIONS

    1. Portable instruments

    2. ADCs and DACs

    3. Smart sensors

    4. Solar powered applications

    5. Loop-current-powered instruments

4. Pin configuration

5. Test pin

Test pin 1 and test pin 5 are reserved for Zener shock in the package. In order to achieve the highest level of accuracy on output, Zener Zapping technology is used to adjust the output voltage. because Each unit may require different adjustments, The resistance value of the test pin varies from pin to pin And from one part to another. User should leave Pin 1 and Pin 5 not connected.

6. Application information

1. Output short circuit behavior

REF19x series devices are completely protected from damage The output is short-circuited to GND or VS due to accident. in this situation Unexpected short circuit situation, reference device is turned off And limit its power supply current to 40 mA.

2. Device power considerations

REF19x series reference can provide load Current to 30 mA, input voltage range is 3.3 V To 15 V. When these devices are used with large Input voltage, be careful not to exceed the maximum value The internal power consumption of these devices. Exceed The published maximum power dissipation specification or Junction temperature can cause premature device failure.

3. Output voltage bypass

For stable operation, low dropout regulator and reference Usually need to connect a bypass capacitor from its VOUT The pins are connected to their GND pins. Although the REF19x series reference Able to operate stably when the capacitive load exceeds 100 μF, A capacitance of 1 μF is sufficient to guarantee the rated performance. Add a 0.1 μF ceramic capacitor and The bypass capacitor improves the load current transient performance. In order to obtain the best line voltage transient performance, it is recommended to use Bypass the voltage input of these devices with 10 μF The electrolytic capacitor is connected in parallel with the 0.1 μF ceramic capacitor.

4. Sleep mode operation

All REF19x devices have a sleep function compatible with TTL/CMOS levels. Internally, the pull-up current source of VS is Connect to the SLEEP pin. This allows the SLEEP pin Driven by open collector/drain drivers. Logic low or 0 V Turning off the output requires a condition on the SLEEP pin stage. During sleep, the reference output goes high Then determine the impedance state of its potential Through external circuits. If you do not use the sleep function, then It is recommended to connect the SLEEP pin to VS (pin 2).

5. Membrane switch control power supply

The output load current of the REF19x series is tens of mA Reference can be used as a handheld low-dropout power supply Instrument application. One Membrane on/off switch for control operation refer to. Under the initial power-on condition, the SLEEP pin is It is maintained to GND by a 10 kΩ resistor. Recall this condition disables the REF19x output. When the switch is pressed on the membrane, the SLEEP pin is instantly pulled to VS, Enable REF19x output. At this time, the current flows through 10 kΩ The resistance is reduced and the internal current source is connected to SLEEP pin control. Pin 3 hypothesis and remains at the same potential as VS. When the membrane off switch is pressed, the SLEEP pin is momentarily connected to GND, which once again disables the REF19x output