REV. 0

AD6140

–8–

LEVEL DIAGRAM

Figure 10 shows a simplified block diagram of the AD6140 with

the expected signal levels for the minimum gain configuration.

MIXER POST

AMPLIFIER

MIXER

LOCAL

OSCILLATOR INPUT

49.792MHz

–16.3 dBm REFERRED TO 50

MODULATOR

AGC

DETECTOR

CIRCUIT

PREAMPLIFIER

IF INPUT

f = 49.6MHz

60mV p-p

DATA OUT

378mV p-p

AT 192kHz

Figure 10. Level Diagram

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

20-Lead SSOP

(RS-20)

20

11

10

1

0.295 (7.50)

0.271 (6.90)

0.311 (7.9)

0.301 (7.64)

0.212 (5.38)

0.205 (5.21)

PIN 1

SEATING

PLANE

0.008 (0.203)

0.002 (0.050)

0.07 (1.78)

0.066 (1.67)

0.0256

(0.65)

BSC

0.078 (1.98)

0.068 (1.73)

0.009 (0.229)

0.005 (0.127)

0.037 (0.94)

0.022 (0.559)

8

0

Motorola ReFLEX Transceiver

Figure 11 shows a block diagram of the Motorola ReFLEX

chipset solution including the AD6140. As can be seen, the

AD6140 accepts an IF input from a crystal filter at 49.6 MHz.

The frequency synthesizer provides the 6.144 MHz clock, while

the LO is also generated from the frequency synthesizer but is

fed to the AD6140 via the I/Q modulator. The IF data output

and the clock output both feed into the IF data processor. The

LNA bias amplifier provides the AGC voltage for the first LNA

in the receive path. The dc power is supplied from the power

management chip.

LNA

MAX847

PWR MGT

PRIMARY

BATTERY

TRANSMIT

POWER

SOURCE

Tx/Rx

SW

2.4V HBT

PA

SAW

FILTER

929-941MHz SC-4344-A

XTAL

FILTER

49.6MHz

AGC

1 WATT

986-902MHz

MC145181

FREQUENCY

SYNTHESIZER

TRF9506

I/Q

MODULATOR

76.8MHz

REF CLK

IF DATA

CLOCK

AD6140

A/D

IF DATA

PROCESSOR

SPI TO

REFLEX

CODEC

6.144MHz

SAMPLING

CLK

Tx DATA

Figure 11. ReFLEX Transceiver Block Diagram

OBSOLETE