Rainbow Electronics MAX2114 - Manual (Page 7)

MAX2114
DBS Direct Downconverter
_______________________________________________________________________________________ 7
Pin Description (continued)
50%
MOD+,
MOD-
PSOUT+
PSOUT-
50%
50%
50%
t SUM t HM
Figure 1. Modulus Control Timing Diagram
Voltage Drive Output. Control of external charge-pump transistor. CP 44
Feedback Input for Loop Filter FB 43
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. VRLO 39
LOBUFSEL = GND: PECL Prescaler Output. Differential output of the dual-modulus prescaler. Used in
conjunction with PSOUT+. Requires PECL-compatible termination. LOBUFSEL = V
CC
: 50 Ω LO buffer
inverting output.
LOBUF-/
PSOUT-
35
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
CC : 50 Ω LO buffer
noninverting output.
LOBUF+/
PSOUT+
34
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 FUNCTION NAME
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.
LODIVSEL 37