PMB2240 Просмотр технического описания (PDF) - Siemens AG

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PMB2240

GSM-Transmitter

Siemens AG 

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26 External voltage VIREF/PLL

of current sink

fed to IREF/PLL

27 Current sourced

at IREF/PLL

IIREF/PLL

28 Temperature

dependency of

current sourced

at IREF/PLL *

IIREF/PLL

1.2

V

1

100** 360

uA

dependent of

1

resistor value at

RREF/PLL ***

+-2

% temperature range:

-30 to 85 °C

nominal current:

300uA

0RGXODWRU LQSXWV ,,; DQG 44;

29 I-IX and Q-QX

differential input level

30 Recommended

range for ext DC

voltage to compen-

sate internal offset at

I-IX and Q/QX *

VI-IX,

VQ-QX

VDCext

500 1000 mVpp

15

mV

31 Reference voltage VTREF 1.25 1.35 1.45

for I,Q modulating

inputs

V Reference to external 1

GMSK

basebandcircuit to

bias I and Q

of PMB2240

(temperature

compensated)

32 Resistive load at

RTREF

3

TREF *

kOhm

33 Input base current II/Q_DC

1

6

12

uA

34 Differential input

RI-IX

50

kOhm

at 200 kHz

resistance *

35 Differential input

CI-IX

1

pF

capacitance *

36 Input frequency *

fI-IX

fQ-QX

10

MHz

* Design hint

** required by PMB2306 R19 = 6.8kΩ

*** R19 at pin RREF/PLL gives constant PLL reference current at pin IREF/PLL:

( R19max = open -> IIREF/PLLmin = 0,

R19min = 2 KOhm -> IIREF/PLLmax =360uA)

The reproduction, transmission or use of this document is not permitted without express written authority. Offenders will be liable for damages. All

rights, including rights created by patent grant or registration of a utility model or design, are reserved.

Siemens AG

16

05.97

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