Maxon Telecom SP210 用户手册

SP200/210 Maxon SP200/210 Radio

Issue 1.0

DETAILED FUNCTIONAL DESCRIPTION

03/01

Page 5-3

ASW4

ASW4 switches between RxSAT (RDIN) and Tx SAT (TXIN) and
routes to the filter.

VSCLPF

Seventh order Elliptic Variable Switched Capacitor Low Pass Filter.
Cut-off frequency is variable from 50Hz to 300Hz.  Level adjustable in
0.5dB steps from –3dB to +2.5dB.  Output is on pin 23 FLT OUT.

SATRIM1

Not used.

SATRIM2

SAT level adjustment.  Amplitude is controlled in 0.5dB steps from –
3dB to +2.5dB.  Output is on pin 23 FLTOUT.

COM

Compares the external reference voltage (COMPPIN-) with the applied
SAT signal which is from FLTOUT to COMPIN+ and it goes to Logic
High and Logic Low at this point.  The output COMPOUT (pin 21) goes
to the microcontroller IC406.  NB in transmit the SAT is switched into
TXSUM.

ADC / DAC

ADC is not used.  DACs are 8 bit devices.

CONTROL

Control serial interface for control lines.

DATA

Operates as output line for a READ instruction and as input line for a
WRITE instruction, Pin 18.

CLOCK

This is the synchronous input terminal for communication with the
microcontroller, pin 12.

ENBL

With an active low, data read and write is enabled.

AGND.DGND

Reference analogue and digital grounds.