ST7538Q datasheet(12/44 Pages) STMICROELECTRONICS

12 / 44 page

Electrical characteristics

ST7538Q

12/44

CCL

Input capacitance on CL

CCLTH

Current control loop

reference threshold on CL

Figure 14

1.80

1.90

2.00

CCLHYST

Hysteresis on Current loop

reference threshold

Figure 14

210

250

290

TRxTx

Carrier Activation Time

Figure 17 - 600 Baud

Xtal=16MHz

0.01

1.6

Figure 17- 1200 Baud

Xtal=16MHz

0.01

800

µs

Figure 17- 2400 Baud

Xtal=16MHz

0.01

400

µs

Figure 17- 4800 Baud

Xtal=16MHz

0.01

200

µs

TALC

Carrier Stabilization Time

From STEP 16 to zero or

From step 16 to step 31,

Figure 17

Xtal =16MHz

3.2

TST

Tstep

Figure 17

Xtal =16MHz

200

µs

Receiver

VIN

Input Sensitivity (Normal

Mode)

0.5

mVrms

Input Sensitivity (High

Sens.)

250

µV

rms

VIN

Maximum Input Signal

Vrms

RIN

Input Impedance

100

140

Ω

VCD

Carrier detection sensitivity

(Normal Mode)

0.5

mVrms

Carrier detection sensitivity

(High Sensitivity Mode)

250

µV

rms

Carrier detection sensitivity

(TxD line forced to “1”)

UART/SPI pin

forced to “1”

VBU

dB/

µVrms

VBU

Band in Use Detection

Level

dB/

µVrms

Table 4. Electrical characteristics (continued)

(AVdd = DVdd = +5V, PAVcc =+9 V, PAVss, SGND = DVss = 0V, -40°C

≤TA ≤ 85°C, TJ < 125 °C, fc = 86kHz,

other control register parameters as default value, unless otherwise specified)

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

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