AD5422AREZ Analog Devices Inc, AD5422AREZ Datasheet - Page 37

• Manufacturer Part Number: AD5422AREZ
• Description: IC DAC 16BIT SER 24TSSOP
• Manufacturer: Analog Devices Inc

Specifications of AD5422AREZ

• Data Interface: MICROWIRE™, Serial, SPI™
• Design Resources: 16-Bit Fully Isolated Output Module Using AD5422 and ADuM1401 (CN0065) Simplified 16-Bit Voltage Output and 4 mA-to-20 mA Output Solution Using AD5422 (CN0077)
• Settling Time: 25µs
• Number Of Bits: 16
• Number Of Converters: 1
• Voltage Supply Source: Analog and Digital, Dual ±
• Power Dissipation (max): 950mW
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP Exposed Pad, 24-eTSSOP, 24-HTSSOP
• Resolution (bits): 16bit
• Sampling Rate: 40kSPS
• Input Channel Type: Serial
• Supply Voltage Range - Analogue: -26.4V To 0V, 10.8V To 40V
• Supply Voltage Range - Digital: 2.7V To
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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 AV
An inverting buck regulator generates the negative supply for
AV
suppressors (TVS) are placed on all field accessible connections.
A 24 V volt TVS is placed on each I
−V
supply input. For added protection, clamping diodes are
connected from the I
AV
is not required, the +V
V
OUT
SS
SENSE
DD
. For transient overvoltage protection, transient voltage
pin and the –V
and AV
connection, and a 36 V TVS is placed on the field
1
ADDITIONAL PINS OMITTED FOR CLARITY.
SS
BACKPLANE
power supply pins. If remote voltage load sensing
SUPPLY
0.1µF
SENSE
OUT
SENSE
, V
pin can be connected to GND.
OUT
pin can be directly connected to the
, +V
ADuM1200
ADuM1400
V
GND
GND
V
V
V
GND
NC
V
V
V
V
DD1
DD2
OA
OB
IA
IB
IC
ID
SENSE
1
1
2
OUT
GND
GND
GND
Figure 77. AD5412/AD5422 in an Industrial Analog Output Module Application
V
V
V
V
V
V
DD2
V
DD1
V
V
OA
OB
OC
OD
E2
, V
, and −V
IA
IB
2
2
1
OUT
, +V
0.1µF
SENSE
SENSE
pins to the
, and
DD
10kΩ
CLEAR SELECT
directly.
CLEAR
LATCH
SCLK
SDIN
FAULT
SDO
S ELECT
DV
–15V
CC
Rev. C | Page 37 of 40
GND
REGULATOR
DV
INVERTING
CC
BUCK
AD5412/
AD5422
AV
–15V
SS
Isolation between the AD5412/AD5422 and the backplane
circuitry is provided with
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.
10µF
0.1µF
1
AV
REFOUT
DD
C
10µF
0.1µF
COMP
+V
–V
4nF
SENSE
SENSE
REFIN
V
I
OUT
OUT
0.1µF
SMAJ36CA
ADuM1400
36V
18Ω
4.7kΩ
100Ω
AD5412/AD5422
and
24V FIELD SUPPLY
FIELD GROUND
ADuM1200
24V
SMAJ24CA
+V
+V
–V
I
OUT
SENSE
SENSE
OUT