SDA4335 Infineon Technologies Corporation, SDA4335 Datasheet - Page 16

• Manufacturer Part Number: SDA4335
• Description: PLL Frequency Synthesizer, if Counter, 7 Bit ADC, 7 & 4 Bit DAC
• Manufacturer: Infineon Technologies Corporation

R / N Counter
Three State Phase Comparator
Charge Pump
Loop Amp
Semiconductor Group
The SDA 4335 has 2 identical 16bit counter for R and N path. Input frequency for the R-counter is
the buffered XTAL-frequency (61.5MHz). Tuning steps can be selected by the 16bit R-counter from
f
98.2MHz...118.7MHz).
The phase comparator generates a phase error signal according to phase difference between f
counter output) and f
generator. Polarity is fixed positiv for this application note.
The charge pump generates signed pulses of current. 4 current values and 2 outputs are available.
The integrated rail to rail loop amplifier allows an active loop filter design with external components.
Two modes are availiable with status bit D11: high speed and normal mode.
R
= 6.25kHz...100kHz. Input frequency for the N-counter is the buffered LO-frequency (in FM mode
N
(N counter output).This phase error signal drives the charge pump current
Specification
16
SDA 4335
21.5.99
R
(R