REF195GRUZ-REEL7 Analog Devices Inc, REF195GRUZ-REEL7 Datasheet - Page 20
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REF195GRUZ-REEL7
Manufacturer Part Number
REF195GRUZ-REEL7
Description
IC,VOLT REFERENCE,FIXED,5V,BICMOS,TSSOP,8PIN,PLASTIC
Manufacturer
Analog Devices Inc
Series
REF19r
Datasheet
1.REF195GPZ.pdf
(28 pages)
Specifications of REF195GRUZ-REEL7
Reference Type
Series
Voltage - Output
5V
Tolerance
±10mV
Temperature Coefficient
25ppm/°C
Voltage - Input
3 ~ 15 V
Number Of Channels
1
Current - Quiescent
45µA
Current - Output
30mA
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-TSSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Cathode
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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REF19x Series
APPLICATIONS INFORMATION
OUTPUT SHORT-CIRCUIT BEHAVIOR
The REF19x family of devices is totally protected from damage
due to accidental output shorts to GND or to V
an accidental short-circuit condition, the reference device shuts
down and limits its supply current to 40 mA.
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 15 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 the maximum
junction temperature or dissipation of the device:
where
respectively;
device package thermal resistance.
OUTPUT VOLTAGE BYPASSING
For stable operation, low dropout voltage regulators and references
generally require a bypass capacitor connected from their V
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.
=
and
θ
−
is the device power dissipation; and θ is the
are the junction and ambient temperatures,
Figure 20. Simplified Schematic
V
OUTPUT
GND
SLEEP (SHUTDOWN)
S
S
. In the event of
OUT
Rev. K | Page 20 of 28
SLEEP MODE OPERATION
All REF19x devices include a sleep capability that is TTL/CMOS-
level compatible. Internally, a pull-up current source to V
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 V
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 V
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 V
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 V
SLEEP pin is momentarily connected to GND, which once
again disables the REF19x output.
10µF
OFF
ON
1kΩ
V
5%
Figure 22. Membrane Switch Controlled Power Supply
S
Figure 21. Basic Voltage Reference Connections
0.1µF
S
. When the membrane off switch is pressed, the
SLEEP
NC
V
NC = NO CONNECT
NC
S
NC = NO CONNECT
1
2
3
4
REF19x
1
2
3
4
REF19x
10kΩ
S
.
8
7
6
5
8
7
6
5
NC
NC
OUTPUT
NC
NC
NC
OUTPUT
NC
+
1µF
TANT
+
1µF
TANT
S
(Pin 2).
0.1µF
S
is
S
,