TH71221 datasheet(29/44 Pages) MELEXIS

29 / 44 page

TH71221

27 to 930MHz

FSK/FM/ASK Transceiver

39010 071221

Page 29 of 44

Data Sheet

Rev. 009

Nov/15

6.4

PLL Synthesizer Timings

Parameter

Symbol

Condition

Min

Typ

Max

Unit

Channel

switching time

wide band

tSW_WB

BPLL = 20kHz,

ICP = 260µA

200

µs

narrow band

tSW_NB

BPLL = 2kHz,

ICP = 260µA

500

µs

TX – RX switching time

tTX_RX

IF = 10.7MHz

6.5

AC Characteristics of the Receiver Part

all parameters under normal operating conditions, unless otherwise stated;

typical values at Ta = 23 °C and VCC = 3 V;

all parameters based on test circuits for FSK (Fig. 14 to 15) and ASK (Fig. 16 to 17), respectively;

Parameter

Symbol

Condition

Min

Typ

Max

Unit

Input sensitivity

ASK

fRF= 433.92MHz

PminL_ASK

BIF = 180kHz, fm = 2kHz

BER

 310-3

LNA @ low gain

-96

dBm

fRF= 868.3MHz

-96

fRF= 433.92MHz

PminH_ASK

BIF = 180kHz, fm = 2kHz

BER

 310-3

LNA @ high gain

-107

dBm

fRF= 868.3MHz

-107

Input sensitivity

FSK

fRF= 433.92MHz

PminL_FSK

BIF = 180kHz, fm = 2kHz

f =  50 kHz

BER

 310-3

LNA @ low gain

-87

dBm

fRF= 868.3MHz

-87

fRF= 433.92MHz

PminH_FSK

BIF = 180kHz, fm = 2kHz

f =  50 kHz

BER

 310-3

LNA @ high gain

-105

dBm

fRF= 868.3MHz

-105

Maximum input

signal

ASK

fRF= 433.92MHz

PmaxL_ASK LNA @ low gain

-10

dBm

fRF= 868.3MHz

-10

fRF= 433.92MHz

PmaxH_ASK LNA @ high gain

-20

dBm

fRF= 868.3MHz

-20

Maximum input

signal

FSK

fRF= 433.92MHz

PmaxL_FSK LNA @ low gain

-10

dBm

fRF= 868.3MHz

-10

fRF= 433.92MHz

PmaxH_FSK LNA @ high gain

-20

dBm

fRF= 868.3MHz

-20

Start-up time - ASK

ton_ASK

from standby to receive

mode

1.5

Start-up time - FSK

ton_FSK

from standby to receive

mode

1.5

Spurious emission

Pspur_RX

referred to receiver

input

-54

dBm

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