Motorola MTR3000 User Manual

Theory of Operation 4-7
4.2.3 Station Reference
A Temperature Compensated Crystal Oscillator (TCXO) or Oven Controlled Crystal Oscillator
(OCXO) constitute two different SCMs and provide frequency reference for the base station/
repeater. The TCXO or OCXO is 16.8 MHz.
The stability of the TCXO is ±0.5 ppm over temperature (-30ºC to +85ºC) with an aging rate of
±1.0 ppm per year and ±3.0 ppm over 10 years. This stability is sufficient for some applications but
not for others. The MTR3000 controller will also have the option to use an OCXO for high stability
applications (800/900 MHz). This change will be transparent to the software. The stability of the
OCXO is ±50 ppb over temperature (-30ºC to +80ºC) with an aging rate of ±50 ppb per year. The
OCXO will not be placed for all applications other than 800/900 MHz.
RCVR
2
SPI CPLD High rising 8 bits 1 MHz – –
Metering_1
ADC (Maxim
Max149B)
Low rising 24 bits 1.8 MHz 100 ns 0 ns
Metering_2
ADC (Maxim
Max149B)
Low rising 24 bits 1.8 MHz 100 ns 0 ns
Trident IC Low rising 24 bits 20 MHz/
10 MHz
1
10 ns/
20 ns
1
0 ns
EEPROM
(AT25640)
Low rising 32 bits
3
2 MHz 50 ns 50 ns
Abacus Low rising 16 bits
3
10 MHz 5 ns 5 ns
Note
1. Write specifications or Read specifications for Trident IC.
2. Applied to Rx OMAP only.
3. Subsequent location(s) can be accessed if the CS* remain asserted.
Table 4-2 Tx/Rx OMAP SPI Module and Device Parameters (Continued)
Module SPI Device
Device
Enable
(active
high/
low)
MOSI
Data
Latched
(rising/
falling
edge of
SPI
clock)
Minimum
number
of bits
per
access
Max
Clock
Rate
Module
Select
active
to 1st
clock
edge
(min)
Data
complete
to
Module
select
negated
(min)

Motorola MTR3000 Specifications

General

Brand	Motorola
Model	MTR3000
Category	Accessories
Language	English