REF192GP Analog Devices Inc, REF192GP Datasheet - Page 21
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REF192GP
Manufacturer Part Number
REF192GP
Description
VOLTAGE REFERENCE
Manufacturer
Analog Devices Inc
Series
REF19r
Datasheet
1.REF195GPZ.pdf
(28 pages)
Specifications of REF192GP
Leaded Process Compatible
No
Peak Reflow Compatible (260 C)
No
Rohs Status
RoHS non-compliant
Design Resources
Software Configurable 16-Bit Quad-Channel Unipolar/Bipolar Voltage Output Using AD5754 (CN0086) Software Configurable 14-Bit Quad-Channel Unipolar/Bipolar Voltage Output Using AD5734 (CN0087) Software Configurable 12-Bit Quad Channel Unipolar/Bipolar Voltage Output Using AD5724 (CN0088) Software Configurable 16-Bit Dual-Channel Unipolar/Bipolar Voltage Output Using AD5752 (CN0092) Software Configurable 14-Bit Dual-Channel Unipolar/Bipolar Voltage Output Using AD5732 (CN0093) Software Configurable 12-Bit Dual-Channel Unipolar/Bipolar Voltage Output Using AD5722 (CN0094)
Reference Type
Series
Voltage - Output
2.5V
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
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Current - Cathode
-
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
REF192GP
Manufacturer:
ADI
Quantity:
10 619
Part Number:
REF192GP
Manufacturer:
ADI/亚德诺
Quantity:
20 000
Company:
Part Number:
REF192GPZ
Manufacturer:
MAXIM
Quantity:
101
SOLDER HEAT EFFECT
The mechanical stress and heat effect of soldering a part to a
PCB can cause output voltage of a reference to shift in value.
The output voltage of REF195 shifts after the part undergoes the
extreme heat of a lead-free soldering profile, like the one shown
in Figure 23. The materials that make up a semiconductor device
and its package have different rates of expansion and contraction.
The stress on the dice has changed position, causing shift on the
output voltage, after exposed to extreme soldering temperatures.
This shift is similar but more severe than thermal hysteresis.
Typical result of soldering temperature effect on REF19x output
value shift is shown in Figure 24. It shows the output shift due
to soldering and does not include mechanical stress.
6
5
4
3
2
1
0
Figure 24. Output Shift due to Solder Heat Effect
SHIFT DUE TO SOLDER HEAT EFFECT (%)
T
T
25
P
L
T
MAXIMUM RAMP DOWN RATE = 6°C/s
T
SMAX
SMIN
MAXIMUM RAMP UP RATE = 3°C/s
SUPPLIER
SUPPLIER
T
P
PREHEAT AREA
≥ T
C
Figure 23. Classification Profile (Not to Scale)
TIME 25°C TO PEAK
t
t
S
P
Rev. K | Page 21 of 28
T
C
TIME
= –5°C
T
C
CURRENT-BOOSTED REFERENCES WITH CURRENT
LIMITING
Whereas the 30 mA rated output current of the REF19x series is
higher than is typical of other reference ICs, it can be boosted to
higher levels, if desired, with the addition of a simple external
PNP transistor, as shown in Figure 25. Full-time current limiting is
used to protect the pass transistor against shorts.
(SEE TEXT)
COMMON
In this circuit, the power supply current of reference U1 flowing
through R1 to R2 develops a base drive for Q1, whose collector
provides the bulk of the output current. With a typical gain of 100
in Q1 for 100 mA to 200 mA loads, U1 is never required to furnish
more than a few mA, so this factor minimizes temperature-related
drift. Short-circuit protection is provided by Q2, which clamps
the drive to Q1 at about 300 mA of load current, with values as
shown in Figure 25. With this separation of control and power
functions, dc stability is optimum, allowing most advantageous
use of premium grade REF19x devices for U1. Of course, load
V
+V
C
TO 9V
V
S
100µF
S
= 6V
25V
C2
t
Figure 25. Boosted 3.3 V Referenced with Current Limiting
L
+
1N4148
(SEE TEXT
ON SLEEP)
2N3906
t
T
P
D1
USER
P
≤ T
Q2
USER
C
3
2Ω
R4
t
P
(SEE TABLE)
REF196
T
C
U1
2
4
= –5°C
R1
1kΩ
R2
1.5kΩ
1.82kΩ
(SEE TEXT)
6
TIP32A
R3
Q1
(TANTALUM)
C3
0.1µF
10µF/25V
S
C1
S
F
REF19x Series
F
+
U1
REF192
REF193
REF196
REF194
REF195
R1
+V
3.3V
@ 150mA
V
COMMON
OUTPUT TABLE
OUT
OUT
V
2.5
3.0
3.3
4.5
5.0
OUT
(V)