TX PWR

GAIN

ON/OFF

f = 83.16 MHz

Bw = 30 kHz

C

ANTENNA

PORT

T/R

SWITCH

902-

928 MHz

TR SW

XTAL OSC

83.16 ± 1.23 MHz

HANDSET OR BASE

AUDIO

DISCRIMINATOR

DOWN

CONVERTER

TCXO

15.36 MHz

SYNTHESIZER

DATA

3

AMP

LNA

IF AMP

f = 1.23 MHz

C

RSSI

UPCONVERTER

SPREAD

f = 915 MHz

C

ON/OFF

CLOCK

PN ENABLE

PN

TX PWR

PA V

CC

ON/OFF

OTHER CIRCUITS

V

CC

Block Diagram

Note:

1. The module cannot legally be certified without an antenna; this is an FCC requirement.

TDD Rate

7.5 kHz max

Channel

N

End B

First LO, MHz

TX, MHz

RX, MHz

1

1334

825.7536

910.1424

908.9136

2

1350

829.4400

913.8288

912.6000

3

1356

833.1264

917.5152

916.2864

4

1363

837.4272

921.8160

920.5872

Operating Frequencies

Note:

1. Second LO = 84.3888 MHz

2. Reference Divider = 25

3. Phase Detector = 614.4 kHz

4. First IF = 83.160 MHz

5. Second IF = 1.229 MHz

6. Synthesizer PLL Bandwidth = 80 kHz nominal

7. Frequency Accuracy =

±3.5 ppm

(including temperature 0° to 50°C)

8. Switching Time = 2.2 ms nominal, Ch 1 to Ch 4

3-2

AT48810