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參數(shù)資料
| 型號： | TDA8260 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Satellite Zero-IF QPSK/8PSK downconverter with PLL synthesizer |
| 中文描述： | 衛(wèi)星零中頻QPSK/8PSK與PLL合成器變頻器 |
| 文件頁數(shù)： | 8/23頁 |
| 文件大?。?/td> | 143K |
| 代理商： | TDA8260 |
2004 Sep 03
8
Philips Semiconductors
Product specification
Satellite Zero-IF QPSK/8PSK
downconverter with PLL synthesizer
TDA8260TW
P
ROGRAMMABLE ADDRESSES
The programmable address bits MA1 and MA0 offer the
possibility of having up to four TDA8260TW devices in the
same system. The relationship between the voltage
applied to pin AS and the value of bits MA1 and MA0 is
given in Table 3.
Table 3
I
2
C-bus address selection
P
ROGRAMMABLE MAIN DIVIDER RATIO
Program bytes PD1 and PD2 contain the fifteen bits
N14 to N0 that set the main divider ratio. The ratio
N = N14
×
2
14
+ N13
×
2
13
+...+ N1
×
2 + N0.
O
PERATING AND TEST MODES
The mode of operation is set using bits T2, T1 and T0 in
control byte CD1; see Table 4.
Table 4
Mode selection
Note
1.
Status at power-on: the tuning voltage output is
released and pin VT is in the high-impedance state.
R
EFERENCE DIVIDER
Five reference divider ratios allow the adjustment of the
comparison frequency to different values depending on
the compromise that has to be found between step size
and phase noise. The reference divider ratios and the
corresponding comparison frequencies are programmed
using bits R2, R1 and R0; see Table 5.
Table 5
Reference divider ratio
C
HARGE PUMP CURRENT
Four values of charge pump current can be chosen using
bits C1 and C0; see Table 6.
Table 6
Charge pump current
V
AS
MA1
MA0
0 to 0.1V
CC
open-circuit
0.4V
CC
to 0.6V
CC
0.9V
CC
to V
CC
0
0
1
1
0
1
0
1
T2
T1
T0
MODE
XTOUT
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
normal operation
POR state = CP sink
(1)
1
/
2
×
f
DIV
CP sink
normal operation
2
×
f
ref
CP OFF
CP source
OFF
f
XTAL
1
/
2
×
f
DIV
f
XTAL
f
XTAL
2
×
f
ref
f
XTAL
f
XTAL
R2
R1
R0
DIVIDER RATIO
COMPARISON
FREQUENCY
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
2
4
8
2 MHz
1 MHz
500 kHz
not allowed
not allowed
16
250 kHz
not allowed
32
125 kHz
C1
C0
TYPICAL CHARGE PUMP
CURRENT ABSOLUTE VALUES
(
μ
A)
420
900
1360
2320
0
0
1
1
0
1
0
1
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