Datasheet

AD5700/AD5700-1 Data Sheet
Rev. F | Page 4 of 24
Parameter
1
Min Typ Max Unit Test Conditions/Comments
DIGITAL OUTPUTS
V
OH
, Output High Voltage IOV
CC
− 0.5 V
V
OL
, Output Low Voltage 0.4 V
CD Assert
6
85 100 110 mV p-p
HART_IN INPUT
5
Input Voltage Range 0 REF V External reference source
0 1.5 V Internal reference enabled
HART_OUT OUTPUT
Output Voltage 459 493 505 mV p-p AC-coupled (2.2 µF), measured at HART_OUT
pin with 160 Ω load (worst-case load), see
Figure 17 and Figure 18 for HART_OUT
voltage vs. load
Mark Frequency
7
1200 Hz Internal oscillator
Space Frequency
7
2200 Hz Internal oscillator
Frequency Error −0.5 +0.5 % Internal oscillator, −40°C to +85°C
−1
+1
%
Internal oscillator, −40°C to +125°C
Phase Continuity Error
5
0 Degrees
Maximum Load Current
5
160 Ω Worst-case load is 160 Ω, ac-coupled with
2.2 µF, see Figure 21 for recommended
configuration if driving a resistive load
Transmit Impedance 7 Ω
RTS
low, at the HART_OUT pin
70 kΩ
RTS
high, at the HART_OUT pin
INTERNAL OSCILLATOR
Frequency 1.2226 1.2288 1.2349 MHz −40°C to +85°C
1.2165 1.2288 1.2411 MHz −40°C to +125°C
EXTERNAL CLOCK
External Clock Source Frequency 3.6496 3.6864 3.7232 MHz
1
Temperature range: −40°C to +125°C; typical at 25°C.
2
Current consumption specifications are based on mean current values.
3
The demodulator and modulator currents are specified using an external clock. If using an external crystal oscillator, the crystal oscillator current specification must be
added to the corresponding V
CC
and IOV
CC
demodulator/modulator current specification to obtain the total supply current required in this mode.
4
The demodulator and modulator currents are specified using an external clock. If using the internal oscillator, the internal oscillator current specification must be
added to the corresponding V
CC
and IOV
CC
demodulator/modulator current specification to obtain the total supply current required in this mode.
5
Guaranteed by design and characterization, but not production tested.
6
Specification set assuming a sinusoidal input signal containing preamble characters at the input and an ideal external filter (see Figure 23).
7
If the internal oscillator is not used, frequency accuracy is dependent on the accuracy of the crystal or clock source used.