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REF191ESZ-REEL

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
Data Sheet REF19x Series
Rev. L | Page 25 of 28
R5
100kΩ
R6
100Ω
R3
10MΩ
U3
AD820
C4
0.1µF
R2
100kΩ
R1
1.1MΩ
Q1
2N3904
+
V
BAT
V
S
, V
BAT
COMMON
V
OUT
COMMON
C2
0.1µF
C1
0.1µF
5.000V
C3
1µF
U1
REF195
(SEE TABLE)
2
3
4
U2
REF195
(SEE TABLE)
2
3
4
+
6
6
+V
S
R4
900kΩ
4
2
7
6
3
+
–
0
0371-030
Figure 32. Fail-Safe 5 V Reference
For V
S
levels lower than the lower threshold, the output of U3 is
low, thus U2 and Q1 are off and U1 is on. For V
S
levels higher
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
S
and is arranged so that when V
S
fails, the default output
comes from U1.
For the R1 to R3 values, as shown in Figure 32, lower/upper V
S
switching thresholds are approximately 5.5 V and 6 V, respec-
tively. These can be changed to suit other V
S
supplies, as can the
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
S
of 3.3 V, which is
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.
500Ω
0.1%
57kΩ
1%
0.1μF
10kΩ
1%
0.1μF
1/4
OP492
10μF
REF195
2.21kΩ
20kΩ
1%
10kΩ
1%
20kΩ
1%
20kΩ
1%
20kΩ
1%
0.01μF
10μF
100Ω
OUTPUT
2N2222
+
1μF
+
62
4
+
–
1
4
11
2
3
1/4
OP492
+
–
7
5
6
1/4
OP492
+
–
14
12
13
1/4
OP492
+
–
8
10
9
10kΩ
1%
00371-031
Figure 33. Low Power, Strain Gage Circuit
REF19x Series Data Sheet
Rev. L | Page 26 of 28
OUTLINE DIMENSIONS
COMPLIANT TO JEDEC STANDARDS MS-001
CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
CORNER LEADS MAY BE CONFIGURED AS WHOLE OR HALF LEADS.
070606-A
0.022 (0.56)
0.018 (0.46)
0.014 (0.36)
SEATING
PLANE
0.015
(0.38)
MIN
0.210 (5.33)
MAX
0.150 (3.81)
0.130 (3.30)
0.115 (2.92)
0.070 (1.78)
0.060 (1.52)
0.045 (1.14)
8
1
4
5
0.280 (7.11)
0.250 (6.35)
0.240 (6.10)
0.100 (2.54)
BSC
0.400 (10.16)
0.365 (9.27)
0.355 (9.02)
0.060 (1.52)
MAX
0.430 (10.92)
MAX
0.014 (0.36)
0.010 (0.25)
0.008 (0.20)
0.325 (8.26)
0.310 (7.87)
0.300 (7.62)
0.195 (4.95)
0.130 (3.30)
0.115 (2.92)
0.015 (0.38)
GAUGE
PLANE
0.005 (0.13)
MIN
Figure 34. 8-Lead Plastic Dual In-Line Package [PDIP]
P-Suffix (N-8)
Dimensions shown in inches and (millimeters)
8
5
41
PIN 1
0.65 BSC
SEATING
PLANE
0.15
0.05
0.30
0.19
1.20
MAX
0.20
0.09
8°
0°
6.40 BSC
4.50
4.40
4.30
3.10
3.00
2.90
COPLANARIT
Y
0.10
0.75
0.60
0.45
COMPLIANT TO JEDEC STANDARDS MO-153-AA
Figure 35. 8-Lead Thin Shrink Small Outline Package [TSSOP]
(RU-8)
Dimensions shown in millimeters
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
COMPLIANT TO JEDEC STANDARDS MS-012-AA
0.25 (0.0098)
0.17 (0.0067)
1.27 (0.0500)
0.40 (0.0157)
0.50 (0.0196)
0.25 (0.0099)
45°
8°
0°
1.75 (0.0688)
1.35 (0.0532)
SEATING
PLANE
0.25 (0.0098)
0.10 (0.0040)
4
1
85
5.00 (0.1968)
4.80 (0.1890)
4.00 (0.1574)
3.80 (0.1497)
1.27 (0.0500)
BSC
6.20 (0.2441)
5.80 (0.2284)
0.51 (0.0201)
0.31 (0.0122)
COPLANARITY
0.10
Figure 36. 8-Lead Standard Small Outline Package [SOIC_N]
Narrow Body
S-Suffix (R-8)
Dimensions shown in millimeters and (inches)
Data Sheet REF19x Series
Rev. L | Page 27 of 28
ORDERING GUIDE
Model
1
Temperature Range Package Description Package Option Ordering Quantity
REF191ES −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8)
REF191ES-REEL −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 2,500
REF191ESZ −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8)
REF191ESZ-REEL −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 2,500
REF191GS −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8)
REF191GS-REEL −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 2,500
REF191GSZ −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8)
REF191GSZ-REEL −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 2,500
REF192ES −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8)
REF192ES-REEL −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 2,500
REF192ES-REEL7 −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 1,000
REF192ESZ −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8)
REF192ESZ-REEL −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 2,500
REF192ESZ-REEL7 −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 1,000
REF192FS −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8)
REF192FS-REEL −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 2,500
REF192FS-REEL7 −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 1,000
REF192FSZ −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8)
REF192FSZ-REEL −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 2,500
REF192FSZ-REEL7 −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 1,000
REF192GPZ −40°C to +85°C 8-Lead PDIP P-Suffix (N-8)
REF192GRUZ −40°C to +85°C 8-Lead TSSOP RU-8
REF192GRUZ-REEL7 −40°C to +85°C 8-Lead TSSOP RU-8 1,000
REF192GS −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8)
REF192GS-REEL −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 2,500
REF192GS-REEL7 −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 1,000
REF192GSZ −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8)
REF192GSZ-REEL −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 2,500
REF192GSZ-REEL7 −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 1,000
REF193GSZ −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8)
REF193GSZ-REEL −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 2,500
REF194ES −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8)
REF194ESZ −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8)
REF194ESZ-REEL −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 2,500
REF194GS-REEL −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 2,500
REF194GS-REEL7 −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 1,000
REF194GSZ −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8)
REF194GSZ-REEL −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 2,500
REF194GSZ-REEL7 −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 1,000
REF195ES −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8)
REF195ES-REEL −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 2,500
REF195ESZ −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8)
REF195ESZ-REEL −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 2,500
REF195FS −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8)
REF195FS-REEL −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 2,500
REF195FSZ −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8)
REF195FSZ-REEL −40°C to +85°C 8-Lead SOIC_N S-Suffix (R-8) 2,500
REF195GPZ −40°C to +85°C 8-Lead PDIP P-Suffix (N-8)
REF195GRU-REEL7 −40°C to +85°C 8-Lead TSSOP RU-8 1,000
REF195GRUZ −40°C to +85°C 8-Lead TSSOP RU-8
REF195GRUZ-REEL7 −40°C to +85°C 8-Lead TSSOP RU-8 1,000
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28

REF191ESZ-REEL

Mfr. #:
Buy REF191ESZ-REEL
Manufacturer:
Analog Devices Inc.
Description:
Voltage References 2.048V Prec Micropwr LDO Low VRef
Lifecycle:
New from this manufacturer.
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