REF192ES-REEL7 datasheet(19/28 Pages) AD

Part #	REF192ES-REEL7

Description	Precision Micropower, Low Dropout Voltage References

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REF19x Series

Rev. I | Page 19 of 28

APPLICATIONS

OUTPUT SHORT-CIRCUIT BEHAVIOR

The REF19x family of devices is completely protected from

damage due to accidental output shorts to GND or to V+. In the

event of an accidental short-circuit condition, the reference

device shuts down and limits its supply current to 40 mA.

V+

VOUT

SLEEP (SHUTDOWN)

GND

Figure 20. Simplified Schematic

DEVICE POWER DISSIPATION CONSIDERATIONS

The REF19x family of references is capable of delivering load

currents to 30 mA with an input voltage that ranges from

3.3 V to 5 V. When these devices are used in applications with

large input voltages, exercise care to avoid exceeding the

maximum internal power dissipation of these devices.

Exceeding the published specifications for maximum power

dissipation or junction temperature can result in premature

device failure. The following formula should be used to

calculate a device’s maximum junction temperature or

dissipation:

JA

A

J

D

T

P

θ

−

=

In this equation, TJ and TA are the junction and ambient

temperatures, respectively; PD is the device power dissipation;

and θJA is the device package thermal resistance.

OUTPUT VOLTAGE BYPASSING

For stable operation, low dropout voltage regulators and

references generally require a bypass capacitor connected from

their VOUT pins to their GND pins. Although the REF19x family

of references is capable of stable operation with capacitive loads

exceeding 100 μF, a 1 μF capacitor is sufficient to guarantee

rated performance. The addition of a 0.1 μF ceramic capacitor

in parallel with the bypass capacitor improves load current

transient performance. For best line voltage transient

performance, it is recommended that the voltage inputs of these

devices be bypassed with a 10 μF electrolytic capacitor in

parallel with a 0.1 μF ceramic capacitor.

SLEEP MODE OPERATION

All REF19x devices include a sleep capability that is

TTL/CMOS-level compatible. Internally, a pull-up current

source to VIN is connected at the SLEEP pin. This permits the

SLEEP pin to be driven from an open collector/drain driver. A

logic low or a 0 V condition on the SLEEP pin is required to

turn off the output stage. During sleep, the output of the

references becomes a high impedance state where its potential

would then be determined by external circuitry. If the sleep

feature is not used, it is recommended that the SLEEP pin be

connected to VIN (Pin 2).

BASIC VOLTAGE REFERENCE CONNECTIONS

The circuit in Figure 21 illustrates the basic configuration for

the REF19x family of references. Note the 10 μF/0.1 μF bypass

network on the input and the 1 μF/0.1 μF bypass network on

the output. It is recommended that no connections be made to

Pin 1, Pin 5, Pin 7, and Pin 8. If the sleep feature is not required,

Pin 3 should be connected to VIN.

NC

VIN

SLEEP

NC

OUTPUT

0.1µF

10µF

REF19x

NC = NO CONNECT

8

7

6

5

1

2

3

4

1µF

TANT

0.1µF

+

Figure 21. Basic Voltage Reference Configuration

MEMBRANE SWITCH-CONTROLLED POWER

SUPPLY

With output load currents in the tens of mA, the REF19x family

of references can operate as a low dropout power supply in

hand-held instrument applications. In the circuit shown in

Figure 22, a membrane on/off switch is used to control the

operation of the reference. During an initial power-on condition,

the SLEEP pin is held to GND by the 10 kΩ resistor. Recall that

this condition (read: three-state) disables the REF19x output.

When the membrane on switch is pressed, the SLEEP pin is

momentarily pulled to VIN, enabling the REF19x output. At this

point, current through the 10 kΩ resistor is reduced, and the

internal current source connected to the SLEEP pin takes

control. Pin 3 assumes and remains at the same potential as VIN.

When the membrane off switch is pressed, the SLEEP pin is

momentarily connected to GND, which once again disables the

REF19x output.

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