Preliminary
11-3
RF2510
Rev A6 010207
11
Pin
Function
Description
Interface Schematic
1OSC B
This pin is connected directly to the reference oscillator transistor base.
The intended reference oscillator configuration is a modified Colpitts.
An appropriate capacitor as chosen by the customer should be con-
nected between pin 1 and pin 2.
2OSC E
This pin is connected directly to the emitter of the reference oscillator
transistor. An appropriate capacitor as chosen by the customer should
be connected from this pin to ground.
See pin 1.
3GND1
Ground connection for the VCO OUT buffer amp.
4VCO OUT
Buffered outputofthe VCO
5VCC
This pin is used to supply DC bias to the entire IC. ARF Bypass capac-
itor should be connected directly to ground.
6GND
Ground connection.
7PD
Power Down control for all circuitry. When this pin is a logic “low” all cir-
cuits are turned off.
8NC
Not internally connected.
9
MOD CTRL
This pin is used to select the prescaler modulus. A logic “high” selects
64 or 128 for the prescaler divisor. A logic “low” selects 65 or 129 for
the prescaler divisor.
10
DIV CTRL
This pin is used to select the desired prescaler divisor. A logic “high”
selects the 64/65 divisor. A logic low selects the 128/129 divisor.
11
RESNTR-
The RESNTR pins are used to supply DC voltage to the VCO, as well
as to tune the center frequency of the VCO. Equal value inductors
should be connected to this pin and pin 13.
12
MOD IN
FM analog or digital modulation can be imparted to the VCO through
this pin. The VCO varies in accordance to the voltage level presented
to this pin. To set the deviation to a desired level, a voltage divider refer-
enced to Vcc is recommended. Because the modulation varactors are
part of the resonator tank, the deviation is slightly dependent upon the
components used in the external tank.
See pin 11.
13
RESNTR+
See pin 11.
See pin 11.
14
LOOP FLT
Output of the charge pump. An RC network from this pin to ground is
used to establish the PLL bandwidth.
OSC E
OSC B
V
CC2
VCO OUT
20
V
CC
50 k
Ω
PLL ENABL
MOD CTL
DIV CTL
RESNTR-
RESNTR+
4k
Ω
MOD IN
LOOP FLT
V
CC
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