ST7540 datasheet(11/44 Pages) STMICROELECTRONICS

11 / 44 page

ST7540

Electrical characteristics

11/44

VSENSE

VSENSE Input

impedance

Ω

CLTH

Current control loop

reference threshold on

CL pin

Figure 17

1.80

1.90

2.00

CLHYST

Hysteresis on current

loop reference

threshold

Figure 17

210

250

290

TRxTx

Carrier activation time

Figure 21 - 600

Baud Xtal = 16MHz

1.6

Figure 21- 1200 Baud

Xtal = 16MHz

800

µs

Figure 21- 2400 Baud

Xtal = 16MHz

400

µs

Figure 21- 4800 Baud

Xtal = 16MHz

200

µs

TALC

Carrier stabilization

time

from STEP 16 to zero

or from step 16 to step

31,

Figure 21

Xtal = 16MHz

3.2

TST

Tstep

Figure 21

Xtal = 16MHz

200

µs

Power amplifier

PAIN(Offset)

Input terminals

OFFSET

±18

GBWP

Gain bandwidth

product

100

MHz

RIN

Input resistance at

PA_IN+ and PA_IN-

pins

PA_IN+ vs. Vss (1)

Ω

PA_IN- vs. Vss (1)

Ω

CIN

Input capacitance at

PA_IN+ and PA_IN-

pins

PA_IN+ vs. Vss (1)

5pF

PA_IN- vs. Vss (1)

5pF

CMRR

Common mode

rejection ratio

Table 5. Electrical characteristics (continued)

( VDD = +5V, VCC =+9 V, VSS = SVSS = GND = 0V,-40°C ≤TA ≤85°C, TJ < 125°C,

unless otherwise specified)

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

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