TRF2443IPFPR datasheet(67/72 Pages) TI

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TRF2443

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

Table 12. Pin Termination Requirements/Limitations (continued)

NAME

DESCRIPTION

RXAGC

Receiver-chain VGA gain-control dc-voltage input. Equivalent input impedance: 100 k

Ω in series with 4

pF.

RXINP/ RXINN

68, 69

RX input differential terminals. Input impedance is 50

Ω differential. A 1:1 balun is required to drive it

single-ended.

RXLOTEST

RX VCO output pin: test output to check internal RX local oscillator. If it is not used, the pin can be

grounded.

TEMPOUT

Temperature-sensor output. If temperature sensor is not used (disabled), this pin should be terminated

with a 100-k

Ω resistor to ground. If it used, the TEMPOUT buffer can drive impedances of R > 10 kΩ and

C < 100 pF.

TXLOTEST

TX VCO output pin: test output to check internal TX local oscillator. If it is not used, the pin can be

grounded.

TXBBIP/ TXBBIN

22, 21

TX baseband I-channel differential inputs. If EN_TXCM (SPI-3, register 3, B<31>) = 0, external AC

coupling caps and 100-

Ω differential resistor is required.

TXBBQP/

20, 19

TX baseband Q-channel differential inputs. If EN_TXCM (SPI-3, register 3, B<31>) = 0, external AC

TXBBQN

coupling caps and 100-

Ω differential resistor is required.

TXOUTP/

77, 78

TX amplifier open-collector output terminals. A pullup inductor from each pin to power supply is required.

TXOUTN

Output impedance is set typically to 200

Ω differential. A 4:1 impedance-ratio balun is needed to

transform to 50

Ω single-ended.

TXPWD

TX power down; digital input

VCCRX

RX-chain power supply. The decoupling capacitor on this power supply should be connected to the same

ground plane to which the GNDRX pins, 70 and 71, are connected.

XPICAGC

XPIC chain VGA gain-control dc-voltage input. Equivalent input impedance: 100 k

Ω in series with 4 pF.

XPICOUTN/

54, 55

XPIC output-amplifier open-collector output terminals. Output impedance is set typically to 75

Ω

XPICOUTP

differential with an internal resistor so that no external load is required. A pullup inductor from each pin to

the power supply is required. A 1:1 impedance ratio balun is needed to transform to 75

Ω single-ended.

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