TH71221 datasheet(28/44 Pages) MELEXIS

28 / 44 page

TH71221

27 to 930MHz

FSK/FM/ASK Transceiver

39010 071221

Page 28 of 44

Data Sheet

Rev. 005

June/07

Parameter

Symbol

Condition

Min

Typ

Max

Unit

Digital pin characteristics

Pull-down Resistor

pins IN_DTA , RE/SCLK,

TE/SDTA

RPD

120

220

Low level input leakage current

pins IN_DTA, ASK/FSK,

RE/SCLK, TE/SDTA, FS0/SDEN,

FS1/LD

IIL

IINL_FS1/LD only

in Stand-alone user

mode

-2

μA

High level input leakage current

pins ASK/FSK, FS0/SDEN,

FS1/LD

IIH

IINH_FS1/LD only

in Stand-alone user

mode

μA

Analog pin characteristics

MOS switch On resistance

FSK_SW pin

RON

Transmit mode,

if Reg. DTAPOL = 0:

IN_DTA = 0

if Reg. DTAPOL = 1:

IN_DTA = 1

MOS switch Off resistance

FSK_SW pin

ROFF

Transmit mode,

if Reg. DTAPOL = 0:

IN_DTA = 1

if Reg. DTAPOL = 1:

IN_DTA = 0

Peak detector pull-up current

INT2/PDO pin

IPU_PDO

ASK Receive mode,

Reg. PKDET = 1

VOUT_DEM > VINT2/PDO

-1.1

Peak detector leakage current

INT2/PDO pin

IL_PDO

ASK Receive mode,

Reg. PKDET = 1

VOUT_DEM =< VINT2/PDO

-2

μA

OA input offset voltage

VOS

Receive mode

-25

Voltage threshold for high to low

LNA gain transition

GAIN_LNA pin

VGAIN_HL

Receive mode,

Reg. LNACTRL = 0,

Reg. LNAHYST = 1

1.0

1.3

1.6

Voltage threshold for low to high

LNA gain transition

GAIN_LNA pin

VGAIN_LH

Receive mode,

Reg. LNACTRL = 0,

Reg. LNAHYST = 1

1.3

1.6

1.9

RSSI characteristics

RSSI voltage at low IFA

input level

VL_RSSI

Receive mode,

VIN_IFA = 100μV

(CW, 10.7MHz)

0.95

RSSI voltage at high IFA

input level

VH_RSSI

Receive mode,

VIN_IFA = 100mV

(CW, 10.7MHz)

1.95

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