FX980 datasheet(76/86 Pages) CMLMICRO

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TETRA Baseband Processor

FX980

D/980/3

Transmit Parameters

Parameter

Typ

Units

Conditions/Comments

Input bit rate

No. of channels

Modulation type

RRC Roll-off coefficient (a)

|H(f)| 0 - 5.85kHz

|H(f)| @ 9kHz

|H(f)| @ 10.05kHz

|H(f)| @ 12.15kHz

Max spurii @ 16kHz

@ 25kHz

@ 50kHz

@ 75kHz

FIR filter sampling rate

DAC output update rate

DAC resolution

Integral accuracy

Differential accuracy

Offset

Gain matching, I to Q

Gain matching, (I or Q) to ideal Tx

Phase matching, I to Q

Storage time

Active Power

Vector Error (rms., typical)

Vector Error (rms., max)

Vector Error (peak, typical)

Vector Error (peak, max)

I,Q output level VCC = 5.0V

VCC = 3.3V

π/4 DQPSK

0.35

± 0.3

-3 ± 0.3

-6 ± 1

< -30

-60

-68

-78

-80

144

2.304

< ±0.5

< ±0.25

< 25

< ± 0.3dB

< ± 0.3

< ±0.5

< 18

<105

0.017

0.025

0.045

0.07

2.5

1.65

kbps

dBc

kHz

MHz

Bits

LSB

Degrees

Symbols

2 bits/symbol

I and Q

0 dB corresponds to 1V pk-pk

Relative to maximum passband

signal level

Without adjustment

Normalised, 0 - 9kHz

After adjustment, 0 - 9kHz

3.3V, Rx, aux powered down

Vector errors measured with

ideal IF and RF sections

after gain and offset

adjustment, and specified as a

fraction of the nominal vector

value.

Peak to peak, differential at

maximum gain

Notes:

All parameters refer to the entire Tx baseband I and Q channels, unless otherwise indicated.

A gain multiplier function allows independent proportional control of each channel. The multiplier is a 12-bit

word for each channel, input via the serial interface, representing a value from 0 to 1. This multiplication is

applied to the signals from the FIR filters.

Offset adjustment for each channel is available by loading a 12-bit word into the transmit offset register via the

serial interface.

FX980 Datasheet(PDF) 76 Page - CML Microcircuits

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