- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄225341 > TRF2056PWR (TEXAS INSTRUMENTS INC) PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO20 PDF資料下載
參數(shù)資料
| 型號： | TRF2056PWR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO20 |
| 封裝： | PLASTIC, SOP-20 |
| 文件頁數(shù)： | 23/24頁 |
| 文件大?。?/td> | 327K |
| 代理商： | TRF2056PWR |
TRF2056
LOW VOLTAGE 1.2GHz FRACTIONALN/INTEGERN SYNTHESIZER
SLWS111– NOVEMBER 2000
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
serial-data interface timing
DATA
CLOCK
STROBE
tsu_Data
th_Data
tw_CLKHI
tw_CLKLO
tw_STRBHI
th_Strobe
D0
D1
D30
D31
VH
VL
VH
VL
VH
VL
Valid
Change
tsu_Strobe
Figure 2. Serial-Data Interface Timing
PRINCIPLES OF OPERATION
serial programming input
The TRF2056 internal registers are programmed using a three-wire (CLOCK, DATA, STROBE) serial interface.
The serial data is structured into 24-bit standard-length or 32-bit long-length words where one or four bits are
dedicated address bits. The flag LONG in the D-Word determines whether the A0 (LONG = 0) or A1 (LONG = 1)
format is applicable. Figure 3 and Figure 4 show the format of the serial data for two modes of TRF2056
operation: SA7025 emulation and EPM, respectively. The least significant bits (LSB) of the C-Word determines
the operational mode of the TRF2056 device: 00 = SA7025 emulation, 01 = EPM.
In the SA7025 emulation mode, the TRF2056 device emulates the Philips SA7025 synthesizer with respect to
serial programming. Microcontroller software written for the SA7025 synthesizer works transparently when the
TRF2056 device is operated in the SA7025 emulation mode.
Figure 2 shows the timing diagram of the serial input. When STROBE is low, the signal on DATA is clocked into
a shift register on the positive edges of CLOCK. When STROBE is high, depending on 1 or 4 address bit(s),
the data is latched into different working registers or temporary registers. In order to fully program the
synthesizer, four words must be sent: D, C, B, and A. The E-Word is for testing purposes only.
The A-Word contains new data for the main divider. The A-Word is loaded only when a main divider
synchronization signal is also active. This is done to avoid phase jumps while reprogramming the main divider.
The synchronization signal is generated by the main divider.
When the TRF2056 device is operated in any mode, programming the A-Word sets the main charge pumps,
which are located on outputs PHP and PHI, to speed-up mode, as long as STROBE is high.
NOTE:
The C-Word must be sent during the first programming cycle after powerup
in order to set the mode of operation (SA7025 or EPM).
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TRF4000 | Pcs RX-mixer |
| TRF4002PWP | 1850 MHz - 1910 MHz RF/MICROWAVE NARROW BAND MEDIUM POWER AMPLIFIER |
| TRS-1300-1305-8310 | TRIPLE COLOR LED ARRAY |
| TRS-1300-1311-8310 | DUAL COLOR LED ARRAY |
| TRS-1300-1313-1315 | TRIPLE COLOR LED ARRAY |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TRF2253PWR | 制造商:Texas Instruments 功能描述: |
| TRF2253RGL | 制造商:Texas Instruments 功能描述: |
| TRF2253RGLR | 制造商:Texas Instruments 功能描述: |
| TRF2432 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Dual-Band IQ/IF TRANSCEIVER WITH DUAL VCO SYNTHESIZERS |
| TRF2432_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Dual-Band IQ/IF TRANSCEIVER WITH DUAL VCO SYNTHESIZERS |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。