Rainbow-electronics MAX2104 Manual de usuario descargar pdf (Pagina 7)

MAX2104

Direct-Conversion Tuner IC for

Digital DBS Applications

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Pin Description (continued)

NAME FUNCTIONPIN

34 MOD-

PECL Modulus Control. A PECL low on MOD- sets the dual-modulus prescaler to divide by 32. A PECL

logic high sets the divide ratio to 33. Drive with a differential PECL signal with MOD+ (pin 33).

35 PLLIN+ PECL Phase-Locked Loop Input. Drive with a differential PECL signal with PLLIN- (pin 36).

37 PSOUT+

PECL Prescaler Output. Differential output of the dual-modulus prescaler. Used with PSOUT- (pin 38).

Requires PECL-compatible termination.

36 PLLIN- PECL Phase-Locked Loop Input. Drive with a differential PECL signal with PLLIN+ (pin 35).

42 TANK- LO Tank Oscillator Input. Connect to an external LC tank with varactor tuning.

38 PSOUT-

PECL Prescaler Output. Differential output of the dual-modulus prescaler. Used with PSOUT+ (pin 37).

Requires PECL-compatible termination.

43 VRLO LO Internal Regulator. Bypass with a 100pF ceramic chip capacitor to GND.

44 TANK+ LO Tank Oscillator Input. Connect to an external LC tank with varactor tuning.

47 FB Feedback Output. Control of external charge-pump transistor.

48 CP Voltage Drive Output. Control of external charge-pump transistor.

50%

MOD+,

MOD-

PSOUT+

PSOUT-

50%

SUM

Figure 1. Timing Diagram

1 2 3 4 5 6 7 8 9

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Rainbow-electronics MAX2104 Manual de usuario Pagina 7