RF2968 Просмотр технического описания (PDF) - RF Micro Devices

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RF2968

BLUETOOTH™ TRANSCEIVER

RF Micro Devices 

Preliminary

RF2968

Pin Function Description

Interface Schematic

1

VCC1

Supply voltage for the VCO doubler and LO amplifier circuits.

2

VCC2

Supply voltage for the RX mixers, TX PA, and LNA bias circuits.

3

TX OUT Transmitter output. TX OUT output impedance is 50Ω (nominal) when

VCC

the transmitter is enabled. TX OUT is a high impedance when the

transmitter is disabled. Because this pin is DC-biased, an external cou-

pling capacitor is required.

10 Ω

TX OUT

4

RX IN

Receiver input. RX IN input impedance is a low impedance when the

receiver is enabled. RX IN is a high impedance when the receiver is

disabled. An internal series inductor is used to tune the input imped-

RX IN

ance.

5

VCC3

Supply voltage for the RX input stage (LNA).

VCC3

VCC3

6

VCC4

Supply voltage for the TX mixers and bias circuits of the LO amplifier,

LNA, and RX mixers.

7

LPO

Low frequency clock output for low power mode. In sleep mode, this pin

may provide either a 3.2kHz or 32kHz clock having a 50% duty cycle to

the baseband. In other modes, the output is disabled.

8

DVDDH Supply voltage for the RX IF VGA circuit.

9

IREF

Connects an external precision resistor (1% tolerance) for generation

of a constant current reference.

10

VCC5

Supply voltage for the analog IF circuits.

11

D1

This is the output of the charge pump for clock recovery circuit. A RC See pin 26.

network from this pin to ground is used to establish the PLL bandwidth.

12

BPKTCTL In transmit mode, this pin is used as a strobe to enable the PA stage. In See pin 23.

receive mode, the baseband has the option to use this pin to signal the

detection of the sync word. The baseband drives this pin high at the

end of the sync word, at which time a second DC estimation is per-

formed by sampling the trailer bits. If baseband control is not desired to

signal the second DC estimation, then an internal timer is used to mark

the end of the sync word. The BBC bit is used to select the baseband

control option; the default setting uses the internal timer.

13

BDATA1 Input data to transmitter/output data from receiver. The input data is

RXDATA

unfiltered data at 1MHz data rate. The pin is bidirectional, switching

between data in and data out modes during Transmit and Receive

modes respectively.

TX DATA

14

RECCLK Recovered clock output.

See pin 17.

15

RECDATA Recovered data output.

See pin 17.

16

BXTLEN This pin is part of the chip power control circuit. It is used to enable/dis-

able “sleep” mode of chip.

BXTLEN

BDATA1

VCC

11

Rev A13 010912

11-121

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