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參數(shù)資料
| 型號： | AD9755AST |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | 12-Bit, 300 MSPS High-Speed TxDAC+?? D/A Converter |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 0.011 us SETTLING TIME, 14-BIT DAC, PQFP48 |
| 封裝： | PLASTIC, MS-026BBC, LQFP-48 |
| 文件頁數(shù)： | 19/26頁 |
| 文件大?。?/td> | 904K |
| 代理商： | AD9755AST |
REV. 0
AD9753
–19–
D
L
DAC
INPUT
LATCHES
INPUT
LATCHES
PLL/DIVIDER
CLK+ CLK
–
PLLLOCK
DV
DD
AV
DD
I
OUTA
I
OUTB
PORT 1
DATA
INPUT
PORT 2
DATA
INPUT
RSET2
1.9k
FSADJ
0.1 F
REFIO ACOM1 ACOM
DCOM
AD9753
50
50
0.1 F
0.1 F
68
68
INPM
INPP
LOIM
LOIP
OUTP
OUTM
AD8343 ACTIVE MIXER
0.1 F
0.1 F
LOINPUT
M/A-COM ETC-1-1-13 WIDEBAND BALUM
Figure 30. QAM Transmitter Architecture Using AD9753 and AD8343 Active Mixer
–
20
CENTER 860MHz
–
30
–
40
–
50
–
60
–
70
–
80
–
90
–
100
–
110
–
120
11MHz/
SPAN 110MHz
R
–
2MA
MARKER 1 [T2] RBW 10kHz RF ATT 0dB
–
99.88dBm VBW 10kHz
859.91983968MHz SWT 2.8 s UNIT dBm
COMMENT A: 25 MSYMBOL, 64 QAM CARRIER @ 825MHz
–
99.88bBm,
+859.91983968MHz
–
65.67dBm
–
65.15dBm
–
7.05dBm
33.10dB
–
49.91983968MHz
33.10dB
–
49.91983968MHz
1 [T2]
CH PWR
ACP UP
ACP LOW
1 [T2]
2 [T2]
C11
C11
C0
C0
Cu1
Cu1
1
1
2
Figure 31. Signal of Figure 28 Mixed to Carrier
Frequency of 800 MHz
Effects of Noise and Distortion on Bit Error Rate (BER)
Textbook analysis’ of Bit Error Rate (BER) performance are
generally stated in terms of E (energy in watts-per-symbol or
watts-per-bit) and N
O
(spectral noise density in watts/Hz). For
QAM signals, this performance is shown graphically in Figure
32. M represents the number of levels in each quadrature PAM
signal (i.e., M = 8 for 64 QAM, M = 16 for 256 QAM). Figure
32 implies grey coding in the QAM constellation, as well as the
use of matched filters at the receiver, which is typical. The hori-
zontal axis of Figure 32 can be converted to units of energy/
symbol by adding to the horizontal axis 10 log of the number of
bits in the desired curve. For instance, to achieve a BER of 1e-6
with 64 QAM, an energy per bit of 20 dB is necessary. To cal-
culate energy per symbol, we add 10 log(6), or 7.8 dB. 64 QAM
with a BER of 1e-6 (assuming no source or channel coding) can
therefore theoretically be achieved with an energy/symbol-to-
noise (E/N
O
) ratio of 27.8 dB. Due to the loss and interferers
inherent in the wireless path, this signal-to-noise ratio must be
realized at the receiver to achieve the given bit error rate.
Distortion effects on BER are much more difficult to determine
accurately. Most often in simulation, the energies of the stron-
gest distortion components are root-sum-squared with the noise,
and the result is treated as if it were all noise. That being said, if
the example above of 64 QAM with the BER of 1e-6, using the
E/N
O
ratio is much greater than the worst-case SFDR, the noise
will dominate the BER calculation.
The AD9753 has a worst-case in band SFDR of 47 dB at the
upper end of its frequency spectrum (see TPCs 4, 7). When
used to synthesize high-level QAM signals as described above,
noise, as opposed to distortion, will dominate its performance in
these applications.
SNR/BIT
–
dB
00
–
03
–
06
20
5
0
S
–
02
–
05
–
01
–
04
10
15
16 QAM
64 QAM
4 QAM
Figure 32. Probability of a Symbol Error for QAM
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9755-AST | 制造商:Analog Devices 功能描述: |
| AD9755ASTRL | 制造商:Analog Devices 功能描述:DAC 1-CH Segment 14-bit 48-Pin LQFP T/R 制造商:Rochester Electronics LLC 功能描述:14-BIT, 300 MSPS TXDAC+ D/A CONVERTER - Tape and Reel |
| AD9755ASTZ | 功能描述:IC DAC 14BIT 300MSPS 48-LQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:TxDAC+® 標準包裝:1 系列:- 設(shè)置時間:4.5µs 位數(shù):12 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SOICN 包裝:剪切帶 (CT) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:* 其它名稱:MCP4921T-E/SNCTMCP4921T-E/SNRCTMCP4921T-E/SNRCT-ND |
| AD9755ASTZRL | 功能描述:IC DAC 14BIT 300MSPS 48-LQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:TxDAC+® 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1,000 系列:- 設(shè)置時間:1µs 位數(shù):8 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:8 電壓電源:雙 ± 功率耗散（最大）:941mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOIC W 包裝:帶卷 (TR) 輸出數(shù)目和類型:8 電壓，單極 采樣率（每秒）:* |
| AD9755-EB | 功能描述:BOARD EVAL FOR AD9755 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 數(shù)模轉(zhuǎn)換器 (DAC) 系列:TxDAC+® 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- DAC 的數(shù)量:4 位數(shù):12 采樣率（每秒）:- 數(shù)據(jù)接口:串行，SPI? 設(shè)置時間:3µs DAC 型:電流/電壓 工作溫度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581 |
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