Rainbow-electronics MAX2114 Manual do Utilizador descarregar pdf (Página 7)

MAX2114

DBS Direct Downconverter

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Pin Description (continued)

50%

MOD+,

MOD-

PSOUT+

PSOUT-

50%

SUM

Figure 1. Modulus Control Timing Diagram

Voltage Drive Output. Control of external charge-pump transistor.CP44

Feedback Input for Loop FilterFB43

LO Tank Oscillator Input. Connect to an external LC tank with varactor tuning.TANK+40

LO Internal Regulator. Bypass with a 1000pF ceramic chip capacitor to GND.VRLO39

LOBUFSEL = GND: PECL Prescaler Output. Differential output of the dual-modulus prescaler. Used in

conjunction with PSOUT+. Requires PECL-compatible termination. LOBUFSEL = V

: 50Ω LO buffer

inverting output.

LOBUF-/

PSOUT-

LO Tank Oscillator Input. Connect to an external LC tank with varactor tuning.TANK-38

PECL Phase-Locked Loop Input. Drive with a differential PECL signal in conjunction with PLLIN+ (pin 32).PLLIN-33

LOBUFSEL = GND: PECL Prescaler Output. Differential output of the dual-modulus prescaler. Used in

conjunction with PSOUT-. Requires PECL-compatible termination. LOBUFSEL = V

: 50Ω LO buffer

noninverting output.

LOBUF+/

PSOUT+

PECL Phase-Locked Loop Input. Drive with a differential PECL signal in conjunction with PLLIN- (pin 33).PLLIN+32

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 in conjunction with

MOD+ (pin 30).

MOD-31

PIN FUNCTIONNAME

LO Buffer Divider Ratio Input. Drive high to enable divide-by-one LO buffer output. Connect to GND to

enable divide-by-two buffer output.

LODIVSEL37

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Rainbow-electronics MAX2114 Manual do Utilizador Página 7