TRF2443IPFPR datasheet(10/72 Pages) TI

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TRANSMITTER CHARACTERISTICS

TRF2443

SLWS217A – SEPTEMBER 2009 – REVISED SEPTEMBER 2009 ................................................................................................................................... www.ti.com

VCC_3V = 3.3 V ± 5%, TJ = 65°C (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

fIout

TX output frequency

340

MHz

FROM TXBBI/Q INPUTS TO TX RFOUT

Pmax

Maximum output power

TX ATT set to 0(1)

2.5

dBm

Pmin

Minimum output power

TX ATT set to 35

–28.5

dBm

Grange

Gain range

Programmed by SPI

Gstep

1-dB gain step

Two consecutive 1-dB steps

0.8

1.2

TX ATT set to 4(2)

–139

–135

Nout

Output noise floor

dBm/Hz

TX ATT set to 31(2)

–166

–162

Two tones of –2.5 dBm each at TX

27.5

29.5

output(3)

OIP3

Output IP3

dBm

Two tones of –29.5 dBm each at TX

0.5

output(3)

Carrier leakage

Calibrated; TX ATT set to 4(4)

–55

–35

dBm

SBS

Side-band suppression

Uncalibrated(5)

–50

–35

HD2

Second harmonic level

See (1)

–55

dBc

HD3

Third harmonic level

See (1)

–50

dBc

τoff

TX turnoff time(6)

TX_PWD: low

→ high;

100

µs

TX off attenuation(7)

TX_PWD = high

VCM

Baseband input common-mode voltage(8)

1.4

Parallel resistor

Ω

ZBBin

TX differential input impedance

Parallel capacitor

0.1

Γout

Output return loss

Z0 = 50 Ω

(9)

–12

POWER ALARM DETECTOR (See the Power Alarm Detector section)

Detector threshold

See (10)

See (11) See (11)

Response time(12) (specified by design)

See (11)

µs

(1)

Measured after the transformer (0.7-dB insertion loss) and with a TXBBI (or TXBBQ) input level of –23 dBVrms

(2)

No signal applied to TRF2443. This parameter is assured by characterization and is not production tested.

(3)

Two tones of –26 dBVrms each at TXBBI and TXBBQ inputs at 5 MHz and 8 MHz; measured at transformer output (0.7-dB insertion

loss).

(4)

Using internal common and dc offset control

(5)

TXIQ_PHASE set to 8; SPI-3, register 1, B<17,13>

(6)

See the TX Output Power Ramp-Down section.

(7)

Attenuation of output level from TX on.

(8)

Common mode input is set internally. It is possible to disable internal bias through SPI and apply external common mode.

(9)

Single-ended, measured at transformer output

(10) Delta output power level at TX fixed gain that forces detector output low (power alarm).

(11) Detector threshold and response time are fully programmable by the user. (See the Power Alarm Detector section.)

(12) If output power is lower than threshold for more than user-specified value, power-alarm detector output goes low.

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