STA8090EXGA datasheet(34/42 Pages) STMICROELECTRONICS

34 / 42 page

Electrical characteristics

STA8090EXGA

34/42

DS11733 Rev 3

4.8.2

Oscillator electrical specifications

This device contains two oscillators:



a 32.768 kHz oscillator/buffer for RTC circuit.



an OSCI oscillator/buffer in the RF Front-End

When used in oscillator mode, each oscillator requires a specific crystal, with parameters

that must be as close as possible to the following recommended values. When used in input

buffer mode, an external clock source must be applied.

Table 25. RFCHAIN – GLONASS/BeiDou filter and VGA

Symbol

Parameter

Test conditions

Min

Typ

Max

Unit

S11(1)

1. Not tested in production.

Input return loss

GLONASS band

—

-8

—

BeiDou band

—

-8

—

fIFGNS/BDU

IF frequency for

GLONASS

PLL in default condition

with 26 Mhz as

reference

—8.519

—

MHz

IF frequency for BeiDou

—

10.277

—

Noise figure

NF overall chain with

AGC set at 0 dB

—2(1)

—dB

Conversion gain from

RF input to ADC input

VGA at max gain

—

118

—

VGA at min gain

—

IP1dB

RF-IF-VGA input

compression point

VGA min

—

-80

—

dBm

IRR

Image rejection ratio

—

BWGNS/BDU -3dB IF bandwidth

—

MHz

ATT

Alias frequency rejection

F=53 MHz

(fs = 65.474 MHz)

—30(1)

—dB

TgGNS/BDU

IF filter group delay

variation

——

20(1)

Table 26. Synthesizer

Symbol

Parameter

Min.

Typ.

Max.

Unit

FTCXO_XTAL

Input frequency for xtal amplifier (1)

1. That amplifier can be used also like TCXO input buffer

—

MHz

RDIV

Reference divider range

—

NDIV

Loop divider range

—

2047

—

FLO

LO operating frequency

—

3142.656

—

MHz

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