DEMOBOARD-U3600BM Atmel, DEMOBOARD-U3600BM Datasheet - Page 21

• Manufacturer Part Number: DEMOBOARD-U3600BM
• Description: BOARD DEMO FOR U3600BM
• Manufacturer: Atmel
• Type: Cordless Phone ICr

Specifications of DEMOBOARD-U3600BM

• Contents: Board, Software and Documentation
• For Use With/related Products: U3600BM
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Measurement conditions:
LLO1 = 150 nH TOKO
CLO = 10 pF
DLO1/DLO2 = BZT55C51
VCO3 value R10B8 = 1
2.5 V
1.5 V
0.5 V
2 V
1 V
R10B7 = 0
R10B6 = 1
R10B5 = 0
R10B4 = 0
Varicap
voltage
Maximum possible voltage (but not recommended)
0.68 V (channel-1) to 1.24 V (channel-20)
NOTE for PROGRAMMER
If tolerances are known then voltage bands for positive
and negative tolerances are found and then this results
in different VCO3 values for the different channels.
For the example shown it results in three VCO3 values:
in the RANGE-mean you have a VCO-value-1
in the RANGE-upper you have a VCO3-value-2
in the RANGE-lower you have a VCO-value-3
For the uC program you finally will have three different
VCO3 values stored as a ROM-constant, there is no need
to have an EEPROM.
Depending on countries and necessary tolerances you may
have just one RANGE to cover all channels or you may
have more RANGEs, each RANGE will then have its own
VCO3 value.
Typical voltage range measured
on China demo board base is
as an example
(can not reach limit of 2.5V)
Theoretical voltage
RANGE-lower
RANGE-upper
If tolerances of the external tank circuit are negative
(inductance and capacitor value lower than ideal value)
then the voltage band, to cover all 20-channels,
would partly move outside the allowable voltage
range. This can be corrected by increasing the
VCO3 fine adjustment bits reg-10 FA30 to FA34,
for all channels which are outside, to return to the
allowable voltage range.
If tolerances of the external tank circuit are positive
than the voltage band, to cover all 20-channels,
This can be corrected by decreasing the
VCO3 fine adjustment bits reg-10 FA30 to FA34,
allowable voltage range.
(inductance and capacitor value langer than ideal value)
would partly move outside the allowable voltage range.
for all channels which are outside, to return to the
Channels with
VCO3 value-2
Channels with
VCO3 value-3
Channels with
VCO3 value-1
Band is wider due
to different slope of
varicap diode in the
high- voltage range
Band is smaller due
to different slope of
varicap diode in the
low voltage range