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參數(shù)資料
| 型號(hào)： | EVAL-AD5422LFEBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 33/44頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR AD5422LFEBZ |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | * |
Data Sheet
AD5412/AD5422
Rev. I | Page 39 of 44
Table 25. Thermal and Supply Considerations for Each Package
Considerations
TSSOP
LFCSP
Maximum Allowed Power
Dissipation When Operating at an
Ambient Temperature of 85°C
mW
14
.
1
35
85
125
=
=
JA
A
J
T
max
T
θ
W
21
.
1
33
85
125
=
=
JA
A
J
T
max
T
θ
Maximum Allowed Ambient
Temperature When Operating
from a Supply of 40 V and Driving
24 mA Directly to Ground
C
86
35
)
028
.
0
40
(
125
°
=
×
=
×
JA
D
J
P
max
T
θ
C
88
33
)
028
.
0
40
(
125
°
=
×
=
×
JA
D
J
P
max
T
θ
Maximum Allowed Supply
Voltage When Operating at an
Ambient Temperature of 85°C and
Driving 24 mA Directly to Ground
V
40
35
028
.
0
85
125
=
×
=
×
JA
DD
A
J
AI
T
max
T
θ
V
43
33
028
.
0
85
125
=
×
=
×
JA
DD
A
J
AI
T
max
T
θ
INDUSTRIAL ANALOG OUTPUT MODULE
Many industrial control applications have requirements for
accurately controlled current and voltage output signals. The
specifically for use in an industrial control application. The design
provides for a current or voltage output. The module is powered
from a field supply of 24 V. This supplies AVDD directly. An inverting
buck regulator generates the negative supply for AVSS. For transient
overvoltage protection, transient voltage suppressors (TVS) are
placed on all field accessible connections. A 24 V volt TVS is placed
on each IOUT, VOUT, +VSENSE, and VSENSE connection, and a 36 V TVS
is placed on the field supply input. For added protection, clamping
diodes are connected from the IOUT, VOUT, +VSENSE, and VSENSE
pins to the AVDD and AVSS power supply pins. If remote voltage load
sensing is not required, the +VSENSE pin can be directly connected to
the VOUT pin and the –VSENSE pin can be connected to GND.
circuitry is provided with ADuM1400 and ADuM1200 iCoupler
digital isolators; further information on iCoupler products is
available at www.analog.com/isolators. The internally generated
side of the digital isolaters, removing the need to generate a digital
power supply on the field side of the isolation barrier. The AD5412/
AD5422 digital supply output supplies up to 5 mA, which is more
than enough to supply the 2.8 mA requirements of the ADuM1400
and ADuM1200 operating at a logic signal frequency of up to
1 MHz. To reduce the number of isolators required, nonessen-
tial signals such as CLEAR can be connected to GND. FAULT
and SDO can be left unconnected, reducing the isolation
requirements to just three signals. See Circuit Note CN0321 for
an example of a built and tested circuit of a fully isolated, single
channel voltage and 4 mA to 20 mA output with HART.
INDUSTRIAL HART CAPABLE ANALOG OUTPUT
APPLICATION
Many industrial control applications have requirements for
accurately controlled current output signals, and the AD5412/
AD5422 are ideal for such applications. Figure 82 shows the
module, specifically for use in an industrial control application in
which both the voltage output and current output are available—
one at a time—on one pin, thus reducing the number of screw
connections required. There is no conflict with tying the two output
pins together because only the voltage output or the current output
can be enabled at any one time. For further information on this
The design provides for a HART-enabled current output, with
the HART capability provided by the AD5700/AD5700-1 HART
modem, the industry’s lowest power and smallest footprint HART-
compliant IC modem. For additional space-savings, the AD5700-1
offers a 0.5% precision internal oscillator. The HART_OUT signal
from the AD5700 is attenuated and ac-coupled into the RSET pin
LFCSP package option can be used for this configuration. It should
be noted however, that since the TSSOP package does not have
a CAP1 pin, C1 (see Figure 82) cannot be inserted in this case.
While the TSSOP equivalent circuit (as in Figure 82 but without
C1 in place) still passes the HART Communication Foundation
physical layer specs, the results with C1 in place are superior to
those without C1 in place. Further information on an alternative
configuration, whereby the HART signal is coupled into the CAP2
pin can be found in Application Note AN-1065. This is based
AD5422. Use of either configuration results in the AD5700 HART
modem output modulating the 4 mA to 20 mA analog current
without affecting the dc level of the current. This circuit adheres
to the HART physical layer specifications as defined by the
HART Communication Foundation.
The module is powered from a field supply of ±10.8 V to ±26.4 V.
This supplies AVDD/AVSS directly. For transient overvoltage
protection, transient voltage suppressors (TVS) are placed on
both the IOUT and field supply connections. A 24 V TVS is
placed on the IOUT connection, and a 36 V TVS is placed on the
field supply input(s). For added protection, clamping diodes are
connected from the IOUT pin to the AVDD and GND power
supply pins. A 10 kΩ current limiting resistor is also placed in
series with the positive terminal of the +VSENSE buffer input.
This is to limit the current to an acceptable level during a
transient event.
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| EVAL-AD5424EB | 制造商:Analog Devices 功能描述:EVALUATION BOARD I.C. - Bulk 制造商:Rochester Electronics LLC 功能描述: |
| EVAL-AD5424EBZ | 功能描述:BOARD EVALUATION FOR AD5424 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 數(shù)模轉(zhuǎn)換器 (DAC) 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- DAC 的數(shù)量:4 位數(shù):12 采樣率（每秒）:- 數(shù)據(jù)接口:串行，SPI? 設(shè)置時(shí)間:3µs DAC 型:電流/電壓 工作溫度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581 |
| EVAL-AD5425EB | 制造商:Analog Devices 功能描述:EVALUATION BOARD I.C. - Bulk |
| EVAL-AD5425EBZ | 功能描述:BOARD EVALUATION FOR AD5425 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 數(shù)模轉(zhuǎn)換器 (DAC) 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- DAC 的數(shù)量:4 位數(shù):12 采樣率（每秒）:- 數(shù)據(jù)接口:串行，SPI? 設(shè)置時(shí)間:3µs DAC 型:電流/電壓 工作溫度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581 |
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