ST7540 datasheet(10/44 Pages) STMICROELECTRONICS

10 / 44 page

Electrical characteristics

ST7540

10/44

VOH

High logic level output

voltage

IOH= -2mA

VDD -

0.75

VOL

Low logic level output

voltage

IOL= 2mA

GND

+ 0.4

Oscillator

External Clock X2 voltage swing

External clock. Figure 4

Vpp

External Clock X2 DC voltage level

External clock. Figure 4

2.5

XTAL Clock duty cycle

External clock.

Xtal

Crystal oscillator

frequency

fundamental

MHz

XtalESR

External oscillator esr

resistance

Ω

XtalCL

External oscillator

stabilization

capacitance

Figure 6

Transmitter

ITX_OUT

Output transmitting

current on TX_OUT

1mArms

VTX_OUT

Max carrier output AC

voltage

RCL = 1.4kΩ

Vsense = 0V

1.75

2.3

3.5

VPP

VTX_OUTDC

Output DC voltage on

TX_OUT

1.7

2.1

2.5

HD2TX_OUT

Second harmonic

distortion on TX_OUT

VTX_OUT = 2VPP;

Fc = 86KHz, no load

-42

dBc

HD3TX_OUT

Third harmonic

distortion on TX_OUT

VTX_OUT = 2VPP;

Fc = 86KHz, no load

-49

dBc

G accuracy

Accuracy on voltage

control loop active

RCL = 0Ω

-1

GST

ALC gain step control

loop gain step

0.6

1.4

DRNG

ALC dynamic range

CCL

Input capacitance on

CL pin

VsenseTH

Voltage control loop

reference threshold on

Vsense pin

Figure 17

160

180

200

mVPK

VsenseHYST

Hysteresis on voltage

loop reference

threshold

Figure 17

±18

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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