HART Modem

2

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ABSOLUTE MAXIMUM RATINGS

RECOMMENDED DC OPERATING CONDITIONS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

Note 1: Specifications to -40°C are guaranteed by design and are not production tested.

Note 2: Active currents are measured when the device is driven by an external clock XCEN = 1 condition.

Note 3: Guaranteed by design and not production tested.

Note 4: Accuracy is guaranteed based on the external crystal or clock provided.

Voltage Range on All Pins (including AVDD,

DVDD) Relative to Ground .................................-0.5V to +3.6V

Voltage Range on Any Pin Relative to

Operating Temperature Range ...........................-40

°C to +85°C

Storage Temperature Range .............................-65

°C to +150°C

Soldering Temperature...........................Refer to the IPC/JEDEC

J-STD-020 Specification.

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Digital Supply Voltage

2.7

3.6

V

Analog Supply Voltage

2.7

3.6

V

Ground

GND

AGND = DGND

0

0

V

Digital Power-Fail Reset Voltage

2.59

2.64

2.69

V

Active Current

285

μA

Input Low Voltage

DGND

0.30 x

V

Input High Voltage

0.75 x

V

Output Low Voltage

DGND

0.4

V

Output High Voltage

0.8 x

V

I/O Pin Capacitance

Guaranteed by design (Note 3)

15

pF

RST Pullup Resistance

19

45

k

Input Leakage Current XTAL,

RST

-30

+30

μA

Input Leakage Current All Other

Pins

-2

+2

μA

Input Low Current for

RST

170

μA

CLOCK SOURCE

External Clock Frequency

-1%

3.6864

+1%

MHz

VOLTAGE REFERENCE

Internal Reference Voltage

1.23

V

FSK INPUT

Input Voltage Range at FSK_IN

0

V

FSK OUTPUT

Output Voltage at FSK_OUT

AC-coupled max 30k

load

400

500

600

For a mark

-1%

1200

+1%

Frequency of FSK_OUT (Note 4)

For a space

-1%

2200

+1%

Hz