RF2512 RF Micro Devices, RF2512 Datasheet - Page 4

• Manufacturer Part Number: RF2512
• Description: UHF TRANSMITTER
• Manufacturer: RF Micro Devices

11
11-14
Pin
14
15
16
17
18
19
20
21
22
23
24
RF2512
MOD CTRL
LOOP FLT
DIV CTRL
RESNTR+
RESNTR-
OSC SEL
Function
MOD IN
GND3
VCC2
ESD
NC
NC
Description
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.
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.
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 the recommended. Because the modulation varactors
are part of the resonator tank, the deviation is slightly dependent upon
the components used in the external tank.
This pin is used to is supply DC bias to the VCO, prescaler, and PLL.
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 20.
Not internally connected.
See pin 18.
GND is the ground shared on chip by the VCO, prescaler, and PLL
electronics. Keep traces physically short and connect immediately to
ground plane for best performance.
Not internally connected.
Output of the charge pump. An RC network from this pin to ground is
used to establish the PLL bandwidth.
A logic high (OSC SEL>2.0V) applied to this pin powers on reference
oscillator 2 and powers down reference oscillator 1. A logic low (OSC
SEL<1.0V) applied to this pin powers on reference oscillator 1 and
powers down reference oscillator 2.
This diode structure is used to provide electrostatic discharge protec-
tion to 3kV using the Human body model. The following pins are pro-
tected: 1-3, 9, 10, 12-15, 17, 21, 23.
RESNTR+
Interface Schematic
See pin 18.
See pin 18.
DIV CTL
MOD CTL
V
CC
Rev B9 010509
LOOP FLT
V
CC
RESNTR-
4 k
MOD IN