參數(shù)資料
型號(hào)： AD5422BCPZ-REEL
廠商： ANALOG DEVICES INC
元件分類(lèi)： DAC
英文描述： SERIAL INPUT LOADING, 32 us SETTLING TIME, 16-BIT DAC, QCC40
封裝： 6 X 6 MM, ROHS COMPLIANT, MO-220VJJD-2, LFCSP-40
文件頁(yè)數(shù)： 31/40頁(yè)
文件大?。?/td> 1323K
代理商： AD5422BCPZ-REEL
AD5412/AD5422
Rev. C | Page 37 of 40
INDUSTRIAL ANALOG OUTPUT MODULE
Many industrial control applications have requirements for
accurately controlled current and voltage output signals. The
AD5412/AD5422 are ideal for such applications. Figure 77
shows the AD5412/AD5422 in a circuit design for an output
module, 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.
Isolation between the AD5412/AD5422 and the backplane
circuitry is provided with ADuM1400 and ADuM1200
iCoupler digital isolators; further information on iCoupler
products is available at www.analog.com/icouplers. The
internally generated digital power supply of the AD5412/
AD5422 powers the field 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.
LATCH
SCLK
SDIN
SDO
DVCC
AVSS
AVDD
+VSENSE
–VSENSE
IOUT
VOUT
+VSENSE
–VSENSE
IOUT
+VOUT
CCOMP
GND
CLEAR
FAULT
REFOUT
REFIN
CLEAR SELECT
DVCC
SELECT
AD5412/
AD54221
24V
SMAJ24CA
4nF
24V FIELD SUPPLY
36V
10F
0.1F
10F
0.1F
–15V
INVERTING
BUCK
REGULATOR
–15V
VDD2
GND1
VIA
NC
GND1
VIC
VID
VIB
VOA
VOC
VOD
VOB
GND2
VE2
GND2
ADuM1400
10k
FIELD GROUND
ADuM1200
VDD1
M
IC
R
OC
ON
TR
O
L
LE
R
DI
G
IT
AL
OU
T
P
U
T
S
DI
G
IT
AL
IN
P
U
T
S
0.1F
BAC
KP
L
ANE
I
NT
E
RF
ACE
BACKPLANE
SUPPLY
SMAJ36CA
4.7k
18
100
+
06
99
6-
0
68
1ADDITIONAL PINS OMITTED FOR CLARITY.
Figure 77. AD5412/AD5422 in an Industrial Analog Output Module Application
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