AD5700/AD5700-1

Data Sheet

Rev. D | Page 4 of 24

Parameter1

Min

Typ

Max

Unit

Test Conditions/Comments

DIGITAL OUTPUTS

V

0.4

V

CD Assert6

85

100

110

mV p-p

HART_IN INPUT5

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 15 and Figure 16 for HART_OUT

voltage vs. load

Mark Frequency7

1200

Hz

Internal oscillator

Space Frequency7

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 Error5

0

Degrees

Maximum Load Current5

160

Ω

Worst-case load is 160 Ω, ac-coupled with

2.2 µF, see Figure 19 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

4

The demodulator and modulator currents are specified using an external clock. If using the internal oscillator, the internal oscillator current specification must be

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 21).

7

If the internal oscillator is not used, frequency accuracy is dependent on the accuracy of the crystal or clock source used.