AN4068 datasheet(8/63 Pages) STMICROELECTRONICS

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Electrical characteristics

AN4068

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Doc ID 022923 Rev 2

Electrical characteristics

Table 1.

Electrical and thermal characteristics of the ST7580 reference design

Parameter

Value

Notes

Min.

Typ.

Max.

Unit

Thermal data

Ambient operating temperature

-40

°C

ST7580 thermal resistance

50 (1)

°C/W

Measured on the ST7580 reference design

2-side PCB with thermal pad and 4x4

thermal via array

Transceiver section

Transmitting specifications (Tx mode)

Transmitted signal -20 dB

bandwidth

kHz

FSK 9600 baud

14.5

Any PSK mode

Transmitted output current limit

A rms

Receiving specifications (Rx mode)

Minimum detectable received

signal

dBµ

Vrms

B-PSK coded,

fC = 86 kHz, BER = 10

-3

B-FSK, 9600 baud, fC = 86 kHz,

deviation=1, BER=10-3

Reception filter -3 dB bandwidth

kHz

Mains coupling specifications

Transformer isolation

4 (2)

Power supply requirements

VCC power supply voltage

VCC power supply current

absorption – RX mode

JP7 closed (LK112SM33TR LDO not

enabled)

JP7 open (LK112SM33TR LDO enabled)

VCC power supply current

absorption – TX mode

500

VCC = 8 to 18 V,

I(PA_OUT) = 0 to 1 A rms

VDDIO digital supply voltage

-10%

3.3

+10%

VDDIO digital supply current

absorption

JP7 closed

No digital connection to external equipment

Measured over a continuous transmission period of 3000 seconds (steady-state thermal dissipation). See Figure 39 for

thermal impedance typical curve.

Note that ST does not guarantee transformer isolation. ST assumes no responsibility for the consequences that may arise

from such risks.

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