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参数资料
| 型号： | TMP435ADGST |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO10 |
| 封装： | GREEN, PLASTIC, MSOP-10 |
| 文件页数： | 20/31页 |
| 文件大小： | 477K |
| 代理商： | TMP435ADGST |
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V+
DXP
DXN
GND
GroundorV+layer
onbottomand/or
top,ifpossible.
1
10
2
3
4
8
7
6
5
9
TMP435
0.1 FCapacitor
m
PCBVia
V+
GND
DXP
A0
DXN
A1
www.ti.com
SBOS495A – MARCH 2010 – REVISED APRIL 2010
Layout Considerations
temperature offset readings as a result of leakage
paths between DXP or DXN and GND, or
Remote
temperature
sensing
on
the
TMP435
between DXP or DXN and V+.
measures
very
small
voltages
using
very
low
currents; therefore, noise at the IC inputs must be
minimized. Most applications using the TMP435 have
high digital content, with several clocks and logic
level transitions creating a noisy environment. Layout
should adhere to the following guidelines:
1. Place the TMP435 as close to the remote
junction sensor as possible.
2. Route the DXP and DXN traces next to each
other and shield them from adjacent signals
through the use of ground guard traces, as
shown in Figure 21. If a multilayer PCB is used,
bury these traces between ground or VDD planes
to shield them from extrinsic noise sources. 5 mil
(0,127 mm) PCB traces are recommended.
3. Minimize
additional
thermocouple
junctions
caused by copper-to-solder connections. If these
junctions are used, make the same number and
Note:
Use 5mil (.005in, or 0,127mm) traces with
approximate
locations
of
copper-to-solder
5mil spacing.
connections
in
both
the
DXP
and
DXN
connections to cancel any thermocouple effects.
Figure 21. Example Signal Traces
4. Use a 0.1mF local bypass capacitor directly
between the V+ and GND of the TMP435.
Figure 22 shows the suggested bypass capacitor
placement
for
the
TMP435.
Minimize
filter
capacitance between DXP and DXN to 2200pF or
less for optimum measurement performance. This
capacitance
includes
any
cable
capacitance
between the remote temperature sensor and
TMP435.
5. If
the
connection
between
the
remote
temperature sensor and the TMP435 is less than
8 inches (20,32 cm), use a twisted-wire pair
connection. Beyond 8 inches, use a twisted,
shielded pair with the shield grounded as close to
the TMP435 as possible. Leave the remote
sensor connection end of the shield wire open to
Figure 22. Suggested Bypass Capacitor
avoid ground loops and 60Hz pickup.
Placement
6. Thoroughly clean and remove all flux residue in
and around the pins of the TMP435 to avoid
Copyright 2010, Texas Instruments Incorporated
27
Product Folder Link(s): TMP435
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