ATA2745 データシートの表示（PDF） - Atmel Corporation

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ATA2745

UHF ASK Transmitter

Atmel Corporation 

ATA2745

8. Electrical Characteristics (Continued)

All parameters are refered to GND (pin 5), VS = 3V, Tamb = 25°C, unless otherwise specified

The possible operating ranges refer to different circuit conditions: VS = 2.2V to 4.0V at Tamb = –40°C to +85°C

Parameters

Test Conditions

Symbol

Min.

Typ.

Loop bandwidth

Phase noise PLL

Phase noise VCO

Frequency range of the VCO

Clock output

(CMOS microcontroller compatible)

For best LO noise

Loop filter components:

C2 = 3.9 nF, C1 = 15 nF, R4 = 220Ω

Referring to the phase comparator

fPC = 6.78 MHz

At 1 MHz

At 36 MHz

BLoop

PNPLL

PNVCO

PNVCO

fVCO

Clkout

100

–111

–90

–122

310

fout / 128

Load capacitance at CLK

Series resonance R of the crystal

ASK modulation frequency rate

fXTO = 13.56 MHz

fXTO = 9.84 MHz

Duty cycle of the

modulation signal = 50%

CCLK

Rs

Rs

fmodASK

0

CLK output

- Output current Low

- Output current Low

- Output current High

- Output current High

ASK input

- Low level input voltage

- High level input voltage

- Input current High

Enable ASK

- Low level input voltage

- High level input voltage

- Input current High

VCLK = 0.2 × VS

VCLK = 0.3 × VS

VCLK = 0.8 × VS

VCLK = 0.7 × VS

Iol

Iol

Ioh

Ioh

VASKl

VASKh

IASKh

VEN

VFSKl

VFSKh

IFSKh

150

200

–150

–200

1.7

1.7

Max.

–105

440

10

80

100

20

100

0.3

140

0.3

140

Unit

kHz

dBC/Hz

dBC/Hz

MHz

MHz

pF

Ω

kHz

µA

µA

µA

µA

V

V

µA

V

V

µA

7

4898B–RKE–08/06

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