AD5700/AD5700-1
Data Sheet
Rev. F | Page 18 of 24
HART device, incorporating two-stage protection circuitry. In
this example, a bidirectional (for protection against both positive
and negative high voltage transients) TVS is included to provide
flexibility in the polarity of the connection points of the module.
Because this module could be connected to any point on the
current loop, the higher TVS rating was chosen. The lower
rated second stage provides added protection for th
e AD5700/TYPICAL CONNECTION DIAGRAMS
AD5700-1 using the external and internal options. See the
Analog Devices, Inc., innovative portfolio of industrial
converters like t
he AD5421 loop-powered current-output DAC,
powered current-output DACs, and the AD5755-1, a quad DAC
with innovative dynamic power control technology. The
combination of Analog Devices industrial converters and the
reliability while reducing overall PCB size.
can be interfaced with th
e AD5421 (4 mA to 20 mA loop-powered
powered transmitter circuit. The HART signal from
HART_OUT is introduced to the AD5421 via the CIN pin. The HART enabled smart transmitter reference demo circuit
(the block diagram shown in
Figure 32) was developed by
Analog Devices and uses the
AD5421, a 16-bit, loop-powered,
4 mA to 20 mA DAC, th
e ADuCM360 microcontroller and the
AD5700 modem. This circuit has been compliance tested,
verified, and registered as an approved HART solution by the
HART Communication Foundation. Contact your sales
representative for further information about this demo circuit.
deployment of a robust HART-compliant system.
10435-
023
10F
0.1F
1F
10F
150pF
1F
1.71V TO 5.5V
RE
G
_CAP
R
ESET
IOVCC
VCC
AGND
AD5700/AD5700-1
CL
KO
UT
X
TA
L1
X
TA
L2
+
150k
1.2M
300pF
REF
HART_OUT
DGND
CONFIGURATION
PINS
RE
F
_E
N
FILTE
R
_
S
E
L
DUP
L
E
X
CL
K_CF
G
0
CL
K_CF
G
1
X
T
AL
_E
N
HART_IN
ADC_IP
CD
RXD
TXD
RTS
ADu
C7060
M
ICRO
CO
NT
RO
L
E
R
10F
0.1F
1F
HART
NE
T
W
O
RK
HART
NE
T
W
O
RK
1.71V TO 5.5V
RE
G
_CAP
R
ESET
IOVCC
VCC
AGND
AD5700/AD5700-1
CL
KO
UT
X
TA
L1
X
TA
L2
+
REF
HART_OUT
DGND
CONFIGURATION
PINS
RE
F
_E
N
FILTE
R
_
S
E
L
DUP
L
E
X
CL
K_CF
G
0
CL
K_CF
G
1
X
T
AL
_E
N
HART_IN
ADC_IP
CD
RXD
TXD
RTS
ADu
C7060
M
ICRO
CO
NT
RO
L
E
R
680pF
2.2nF
1F
+
0.1F
10F
1.71V TO 5.5V
+