CML Microcircuits PE0601 Series, User Manual, Page: 23 / 34

Evaluation Kit for CMX7x6x PE0601-xxxx
©
2011 CML Microsystems Plc 23 UM0601/2
As an alternative to the 19.2MHz oscillator a more accurate TCXO could be used with the
following component changes:
Reference
Designator
Action Description
U13 Remove -
C15 Fit 100nF 0603
R21 Fit 18kohm 0603
R22 Fit
[1]
0R 0603
R23 Fit 15kohm 0603
U5 Fit Golledge GTXO-83 series TCXO, or similar
Table 6 – TCXO Component Changes
Note
[1]
, if required allows adjustment from CMX7x6x AuxDAC3 – if supported by the FI being
evaluated.
Additionally, a 32,768Hz crystal is fitted to the CMX7x6x low power oscillator.
6.1.3 Control Interface
The C-BUS and CMX7x6x boot control signals are brought out on connector J10. This is a right
angle male header designed to plug directly into the PE0002 interface card‘s matching female
header.
Alternatively, if not using the PE0002, the CMX7x6x boot control signals can be manually set with
jumpers JP1 and JP2.
6.1.4 Serial Memory
The serial memory, U1, can be used for non-volatile storage of a Function Image
™
. The PE0601
is shipped with a blank serial memory.
The chip select signal for the serial memory is provided by the SSOUT0 signal from the CMX7x6x
device. If the serial memory is not required, this signal, or the GPIO15 option of the same pin, can
be used for another purpose by moving the 0 ohm link from position R69 to position R68. The
signal GP
I O15/SSOUT0 is then avaliable at connector J7, and also J11 if a jumper is inserted
across J14 pin 19 and 20.
6.1.5 Baseband Interfacing
The availability and usage of these signals are Function Image
TM
dependent.
The CMX7x6x differential I and Q inputs are fed through a RC network. Specific requirements for
this network are FI dependent. Differential signals can be input to the RC networks at header,
J24. CML evaluation kits for RF receiver products have matching headers, but the I or Q signal
polarity must be observed. Alternatively, check Function Image™ documentation for the
possibility of a programmable signal inversion.
The CMX7x6x differential I and Q outputs are fed through a RC network. Specific requirements
for this network are FI dependent. The differential signals output from the RC networks can be
monitored at header, J19. CML evaluation kits for RF transmitter products have matching
headers, but the I or Q signal polarity must be observed. Alternatively, check Function Image™
documentation for the possibility of a programmable signal inversion.