AT48802-16QC 查看數據表（PDF） - Atmel Corporation

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AT48802-16QC

Spread-Spectrum Signal Processor Integrated Circuit

Atmel Corporation 

Figure 3. A/D Converter Acquisition Timing Diagram

AD CE

AD SCLK

HI Z

AD DATA

15 Clock Cycles

1/16 MCLK

HI Z

B7 B6 B5 B4 B3 B2 B1 B0 ZERO

RF Controls

AD SCLK is always present. When AD CE is high then the

A/D converter is in the low power mode. Sampling and

conversion begins on the next negative clock edge after

AD CE goes low. For AD CE = 15 cycles wide, conversion

is guaranteed to be completed and still allow time to output

8 data bits before the AD CE goes high again.

TX PWR

The Transmit Power control is synchronous with the TDD

cycle so that the transmit power can turn on and off as

needed. Its sense is settable through R6 b1-2, or it can be

set always in one state for simplex applications.

TR SW

The Transmit Receive Switch function is intended to con-

trol an antenna transmit-receive switch. Its timing is syn-

chronous with TDD and the sense is settable through R9

b4-5, or can be set always in one state for simplex appli-

cations.

Gain

Intended to control the LNA VCC or current to two different

states in order to provide a receive path attenuator to keep

the RSSI level in best range for chip lock loop function.

The timing is synchronous with TDD or can be set always

in one state, via R9 b2-3.

PN EN

The PN Enable function is intended to allow the RF mod-

ule to be set to either spread-spectrum or narrow band

transmission and reception. Narrowband mode is useful

for a telephone handset to very quickly wake-up and de-

termine if it is being signaled by the base, because the

more lengthy spread-spectrum acquisition process is

avoided when no signal is present, thus making the bat-

tery standby time long. If a narrowband signal is present

then a spread-spectrum acquisition may be done to fully

establish the link. The PN EN function is controlled by R2

b5-6 to be either low, high, or three-state high impedance.

PA HI/LO

Power Amp High Low is an output to control the power

amp VCC in the RF module so that in narrowband mode

the transmit power can be held below 1mW to meet FCC

requirements. This is controlled through R6 b0.

Audio and Line Controls

TX AUD MUTE and RX MUTE

Transmit Audio Mute and Receive Mute are intended to

allow the user audio to be turned off as needed to prevent

the other end from hearing undesired signals or noise dur-

ing acquisition, or any other time. They are set via R0 b2-

3.

(continued)

2-8

AT48802

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