REF195GRUZ-REEL7 Analog Devices Inc, REF195GRUZ-REEL7 Datasheet - Page 25
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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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
For V
low, thus U2 and Q1 are off and U1 is on. For V
than the upper threshold, the situation reverses, with U1 off and
both U2 and Q1 on. In the interest of battery power conserva-
tion, all of the comparison switching circuitry is powered from
V
comes from U1.
For the R1 to R3 values, as shown in Figure 32, lower/upper V
switching thresholds are approximately 5.5 V and 6 V, respec-
tively. These can be changed to suit other V
REF19x devices used for U1 and U2, over a range of 2.5 V to
5 V of output. U3 can operate down to a V
generally compatible with all REF19x family devices.
LOW POWER, STRAIN GAGE CIRCUIT
As shown in Figure 33, the REF19x family of references can be
used in conjunction with low supply voltage operational ampli-
fiers, such as the OP492 or the OP747, in a self-contained strain
gage circuit in which the REF195 is used as the core. Other
references can be easily accommodated by changing circuit
element values. The references play a dual role, first as the
voltage regulator to provide the supply voltage requirements of
the strain gage and the operational amplifiers, and second as a
precision voltage reference for the current source used to
stimulate the bridge. A distinct feature of the circuit is that it
can be remotely controlled on or off by digital means via
the SLEEP pin.
S
and is arranged so that when V
S
levels lower than the lower threshold, the output of U3 is
COMMON
V
S
+V
, V
+V
BAT
BAT
S
S
fails, the default output
R1
1.1MΩ
R2
100kΩ
C4
0.1µF
10MΩ
S
S
R3
of 3.3 V, which is
supplies, as can the
R5
100kΩ
3
2
S
+
–
levels higher
7
4
AD820
U3
6
Figure 32. Fail-Safe 5 V Reference
900kΩ
100Ω
R6
R4
S
Rev. K | Page 25 of 28
Q1
2N3904
0.1µF
C2
10μF
2.21kΩ
C1
0.1µF
+
3
3
0.1μF
(SEE TABLE)
(SEE TABLE)
2
REF195
REF195
REF195
U1
U2
2
4
2
4
13
12
10
4
9
10kΩ
1%
Figure 33. Low Power, Strain Gage Circuit
OP492
OP492
–
+
–
+
1/4
1/4
6
6
10kΩ
10kΩ
6
57kΩ
1%
1%
1%
3
2
+
1μF
+
OP492
–
14
1/4
8
11
4
+
C3
1µF
0.1μF
100Ω
20kΩ
20kΩ
1%
1%
5.000V
V
COMMON
OUT
1
20kΩ
1%
2N2222
0.01μF
6
5
500Ω
0.1%
–
OP492
+
1/4
REF19x Series
10μF
20kΩ
1%
7
OUTPUT