T2801-PLH View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
T2801-PLH Datasheet PDF : 27 Pages
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T2801
Data Word 2 Programs
DEMODDAC Adjustment
With bits E6 – E10
Only in RX mode effective. Used to tune the demodulator
center frequency and allows to compensate tolerances of
external components and the T2801.
Demod DAC Voltage
E10 E9 E8 E7 E6 fIFcenter %
0
0
0
0
0
–5
0
0
0
0
1
...
0
0
0
1
0
...
...
1
1
1
0
1
...
1
1
1
1
0
...
1
1
1
1
1
5
MCCS Adjustment
With bits E3 – E5
Only in TX mode effective. Adjusts the modulation com-
pensation circuit for closed loop modulation. This
adjustment is done with a test sequence of a long stream
of ,1‘ – ,0‘. The correct setting is achieved, if the modula-
tion is not affected by the PLL.
MCCS (Modulation Compensation Settings)
E5
E4
E3
MCCS
0
0
0
60%
0
0
1
70%
0
1
0
80%
0
1
1
90%
1
0
0
100%
1
0
1
110%
1
1
0
120%
1
1
1
130%
TEST Mode Settings
With bit E0 – E2 and D11
In normal operation Lock detect output is used. All other
settings are for test only.
D11 E2 E1 E0 Signal at lock
detect output
1 0 0 0 Lock detect
CP mode
Active
0 0 0 1 RC out
1 0 1 0 PC out
Active
Active
X 0 1 1 MCCTEST:
Active
RC out divided by
2048
1 1 0 0 Lock detect
High imp.
0 1 0 1 RC out
High imp.
1 1 1 0 PC out
High imp.
X 1 1 1 GFTEST: RC out High imp.
divided by 2
Rev. A9, 11-Dec-01
Preliminary Information
19 (27)
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