Rainbow Electronics MAX2104 - Manual (Page 7)

MAX2104
Direct-Conversion Tuner IC for
Digital DBS Applications
_______________________________________________________________________________________ 7
Pin Description (continued)
NAME FUNCTION PIN
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%
50%
50%
t SUM t HM
Figure 1. Timing Diagram