Rainbow-electronics MAX2108 Instrukcja Użytkownika Pobierz pdf (Strona 3)

MAX2108

Direct-Conversion Tuner IC

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AC ELECTRICAL CHARACTERISTICS (continued)

= +5V; PS_SEL = 0.5V; P

RFIN

= -20dBm; f

= f

RFIN

+125kHz; GC set via servo loop for V

IOUT

- V

IOUT

= 200mVp-p (differen-

tial); T

= +25°C; unless otherwise noted.)

Note 1: AC specifications with minimum/maximum limits are met within this frequency range.

Note 2: LO and LO are differentially driven through an AC-coupled matching network.

Note 3: P

RFIN

= -20dBm per tone, GC set via servo loop for V

IOUT

- V

IOUT

= 20mVp-p per tone. f1

RFIN

= 1749MHz, f2

RFIN

1751MHz, f

= 1740MHz.

Note 4: P

RFIN

= -20dBm per tone, GC set via servo loop for V

IOUT

- V

IOUT

= 20mVp-p per tone. f1

RFIN

= 1200MHz, f2

RFIN

2150MHz, f

= 951MHz.

CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER

PS_SEL

< 0.5V

PSOUT

= C

PSOUT

= 10pF to GND

33 33

PS_SEL

> 2.4V

Prescaler Divide Ratio

Vp-p1.0

PSOUT -

PSOUT

Differential Prescaler Output

Swing

32 32

At -3dB attenuation

IOUT

= f

IOUT

= f

QOUT

= f

QOUT

= 20MHz

MHz150

IOUT

= f

IOUT

= f

QOUT

= f

QOUT

= 125kHz

Baseband Bandwidth

Ω33

I/Q Channel Differential

Output Impedance

degrees3

I/Q Channel Quadrature

Phase Error (Note 2)

IOUT

= f

IOUT

= f

QOUT

= 125kHz dB1

I/Q Amplitude Mismatch

(Note 2)

IOUT

= f

IOUT

= f

QOUT

= f

QOUT

= 10MHz,

no output load

Vp-p1.4I/Q Channel Clipping Level

Typical Operating Characteristics

= +25°C, unless otherwise noted.)

100

110

105

120

115

125

4.75 4.954.85 5.05 5.15 5.25

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX2108 toc01

(V)

(mA)

= +70°C

= +25°C

= 0°C

-80

-70

-60

-50

-40

-30

-20

-10

1 1.5 2 2.5 3 3.5

CARRIER LEVEL vs. GAIN CONTROL

MAX2108 toc02

GC VOLTAGE (V)

RF LEVEL (dBm)

GC SET FOR 10mVp-p

BASEBAND OUTPUT

RFIN

= 1750 MHz

900 13001100 1500 1700

INPUT IP3 vs. FREQUENCY

MAX2108 toc03

RF FREQUENCY (MHz)

IIP3 (dBm)

TWO-TONE FREQUENCY

SPACING EQUALS 2MHz

1 2 3 4 5 6 7 8 ... 11 12

Direct-Conversion Tuner IC 1

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