- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄375235 > AD7010ARS (ANALOG DEVICES INC) MIL-spec connector accessory PDF資料下載
參數(shù)資料
| 型號(hào)： | AD7010ARS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類(lèi)： | 通信及網(wǎng)絡(luò) |
| 英文描述： | MIL-spec connector accessory |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO24 |
| 封裝： | SSOP-24 |
| 文件頁(yè)數(shù)： | 7/8頁(yè) |
| 文件大?。?/td> | 249K |
| 代理商： | AD7010ARS |
AD7010
REV. B
–7–
Ramp-Up/Down E nvelope Logic
T he AD7010 provides on-chip envelope shaping logic, providing
power shaping control for the beginning and end of a transmit
burst. When BIN (Burst In) is brought high, the modulator is
reset to a transmitting all zeros state (i.e., X
k
= Y
k
= 0) and
continues to transmit all zeros for the first two symbols, during
which the ramp-up envelope goes from zero to full scale as illus-
trated in Figure 10. T he next symbol to be transmitted is [I
1
,
Q
1
], which represents the first two data bits clocked in after
BIN going high, i.e., [X
1
, Y
1
].
2–1
2C O S
π
t
2T
2+1
2C O S
π
t
2T
2 SYMBOLS
2 SYMBOLS
Figure 10. Ramp Envelope
When BIN is brought low, indicating the end of a transmit
burst, the current Di-bit symbol [X
N+4
, Y
N+4
] that the AD7010
is receiving will be the last symbol to be computed for the 4
symbol ramp-down sequence. Also the N
th
symbol is the last
active symbol prior to ramping down.
However, because the impulse response is equal to
±
4 symbols,
four additional symbols are required to fully compute the analog
outputs when transmitting the (N+4)
th
symbol. Hence there will
be eight subsequent T xCLK s, latching four additional Di-bit
symbols: [X
N+5
, Y
N+5
] to [X
N+8
, X
N+8
].
As Figure 11 illustrates, the ramp-down envelope reaches zero
after two symbols, hence the third and fourth symbols do not
actually get transmitted.
Reconstruction Filters
T he reconstruction filters smooth the DAC output signals, pro-
viding continuous time I and Q waveforms at the output pins.
T hese are 4th order Bessel low-pass filters with a –3 dB fre-
quency of approximately 22 kHz, the frequency response is
illustrated in Figure 12. T he filters are designed to have a linear
phase response in the passband and due to the reconstruction
filters being on-chip, the phase mismatch between the I and Q
transmit channels is kept to a minimum.
0
–40
–80
1
1000
100
10
0.1
–60
–20
–30
–50
–70
–10
FREQUENCY – kHz
M
Figure 12. Reconstruction Filter Frequency Response for
I and Q DACs, MCLK = 2.688 MHz
T ransmit Section Digital Interface
MODE1 = MODE2 = DGND: Digital
π
/4 DQPSK Mode
Figures 5 and 6 show the timing diagrams for the transmit
interface when operating in JDC
π
/4 DQPSK mode. Power is
sampled on the rising edge of MCLK . When Power is brought
high, the transmit section is brought out of sleep mode and ini-
tiates a self-calibration routine as described above. Once the
self-calibration is complete, the READY signal goes high to
indicate that a transmit burst can now begin. BIN (Burst in) is
brought high to initiate a transmit burst and should only be
brought high if the READY signal is already high.
X
1
Y
1
X
N
Y
N
Y
N+1
X
N+1
Y
N+2
X
N+2
Y
N+3
X
N+3
Y
N+4
X
N+4
2 SYMBOL
RAMP-UP ENVELOPE
2 SYMBOL
RAMP-DOWN ENVELOPE
I
1
Q
1
I
N
Q
N
I
N+1
Q
N+1
I
N+2
Q
N+2
I
N+3
Q
N+3
I
N+4
Q
N+4
0
0
0
0
SYMBOL
PHASE MAX
EFFECT
BIN
TxCLK
TxDATA
BOUT
(ITx–ITx),
(QTx–QTx)
Y
N+5
X
N+5
Y
N+6
X
N+6
Y
N+7
X
N+7
Y
N+8
X
N+8
= 480
t
1
Figure 11. Transmit Burst
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD7010 | CMOS JDC DQPSK Baseband Transmit Port(CMOS 基帶傳輸口) |
| AD7011 | CMOS, ADC p/4 DQPSK Baseband Transmit Port |
| AD7011ARS | MB 4C 4#12 PIN RECP |
| AD7013ARS | CMOS TIA IS-54 Baseband Receive Port |
| AD7013 | CMOS TIA IS-54 Baseband Receive Port(CMOS 基帶接收口) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7011 | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:CMOS, ADC p/4 DQPSK Baseband Transmit Port |
| AD7011ARS | 制造商:Analog Devices 功能描述:Quadrature Mod 24-Pin SSOP |
| AD7011ARS-REEL | 制造商:Analog Devices 功能描述:Quadrature Mod 24-Pin SSOP T/R 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| AD7013 | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:CMOS TIA IS-54 Baseband Receive Port |
| AD7013ARS | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:CMOS TIA IS-54 Baseband Receive Port |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。