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TDA8261TW 数据表(PDF) 8 Page - NXP Semiconductors

部件名 TDA8261TW
功能描述  Satellite Zero-IF QPSK/8PSK downconverter with PLL synthesizer
Download  22 Pages
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 PHILIPS - NXP Semiconductors

TDA8261TW 数据表(HTML) 8 Page - NXP Semiconductors

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2004 Dec 02
8
Philips Semiconductors
Product specification
Satellite Zero-IF QPSK/8PSK
downconverter with PLL synthesizer
TDA8261TW
PROGRAMMABLE ADDRESS
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 on pin AS and the value of bits MA1 and MA0 is
given in Table 3.
Table 3
I2C-bus address selection
PROGRAMMABLE 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
× 214 + N13 × 213 +...+ N1 × 2 + N0.
OPERATING 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 mode.
REFERENCE DIVIDER
Five reference divider ratios allow to adjust the
comparison frequency to different values, depending on
the compromise which 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, as described in Table 5.
Table 5
Reference divider ratio
CHARGE PUMP CURRENT
Four values of charge pump current can be chosen using
bits C1 and C0, according to Table 6.
Table 6
Typical charge pump current
VAS
MA1
MA0
0 to 0.1VCC
00
open-circuit
0
1
0.4VCC to 0.6VCC
10
0.9VCC to VCC
11
T2
T1
T0
TEST MODE
XTOUT
0
0
0
normal operation
off
0
0
1
POR state = CP sink(1) fXTAL
010
1/2 × fDIV
1/2 × fDIV
0
1
1
CP sink
fXTAL
1
0
0
normal operation
fXTAL
101
2
× f
ref
2
× f
ref
1
1
0
CP off
fXTAL
1
1
1
CP source
fXTAL
R2
R1
R0
DIVIDER RATIO
COMPARISON
FREQUENCY
0
0
0
2
2 MHz
0
0
1
4
1 MHz
0
1
0
8
500 kHz
0
1
1
not allowed
not allowed
1
0
0
not allowed
not allowed
1
0
1
16
250 kHz
1
1
0
not allowed
not allowed
1
1
1
32
125 kHz
C1
C0
ICP (ABSOLUTE VALUE)
0
0
420
µA
0
1
900
µA
1
0
1320
µA
1
1
2320
µA


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