- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄16821 > AD9957/PCBZ (Analog Devices Inc)BOARD EVAL AD9957 QUADRATURE MOD PDF資料下載
參數(shù)資料
| 型號： | AD9957/PCBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 19/64頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL AD9957 QUADRATURE MOD |
| 產(chǎn)品培訓(xùn)模塊： | Direct Digital Synthesis Tutorial Series (1 of 7): Introduction Direct Digital Synthesizer Tutorial Series (7 of 7): DDS in Action Direct Digital Synthesis Tutorial Series (3 of 7): Angle to Amplitude Converter Direct Digital Synthesis Tutorial Series (6 of 7): SINC Envelope Correction Direct Digital Synthesis Tutorial Series (4 of 7): Digital-to-Analog Converter Direct Digital Synthesis Tutorial Series (2 of 7): The Accumulator |
| 設(shè)計資源： | AD9957 Eval Brd Schematic AD9957 BOM AD9957 Gerber Files |
| 標準包裝： | 1 |
| 系列： | AgileRF™ |
| 主要目的： | 計時：DDS 調(diào)制器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | AD9957 |
| 主要屬性： | 14 位數(shù)模轉(zhuǎn)換器，32 位調(diào)節(jié)字寬 |
| 次要屬性： | 1GHz 圖形用戶界面 |
| 已供物品： | 板，軟件 |
| 產(chǎn)品目錄頁面： | 552 (CN2011-ZH PDF) |
| 相關(guān)產(chǎn)品： | AD9957BSVZ-ND - IC DDS 1GSPS 14BIT IQ 100TQFP AD9957BSVZ-REEL-ND - IC DDS 1GSPS 14BIT IQ 100TQFP |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁當前第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁
AD9957
Data Sheet
Rev. C | Page 26 of 64
In Figure 37, it can be seen that the sinc envelope introduces a
frequency dependent attenuation that can be as much as 4 dB at
the Nyquist frequency (half of the DAC sample rate). Without
the inverse sinc filter, the DAC output also suffers from the
frequency dependent droop of the sinc envelope. The inverse
sinc filter effectively flattens the droop to within ±0.05 dB as
shown in Figure 38, which shows the corrected sinc response
with the inverse sinc filter enabled.
1
0
–1
–2
–3
–4
0
0.1
0.2
0.4
0.3
0.5
06384-
017
(d
B)
FREQUENCY RELATIVE TO DAC SAMPLE RATE
INVERSE
SINC
Figure 37. Sinc and Inverse Sinc Responses
–2.8
–2.9
–3.0
–3.1
0
0.1
0.2
0.4
0.3
0.5
06384-
018
(d
B)
FREQUENCY RELATIVE TO DAC SAMPLE RATE
COMPENSATED RESPONSE
Figure 38. DAC Response with Inverse Sinc Compensation
OUTPUT SCALE FACTOR (OSF)
In QDUC and interpolating DAC modes, the output amplitude
is controlled using an 8-bit digital multiplier. The 8-bit multiplier
value is called the output scale factor (OSF) and is programmed
via the appropriate control registers. It is available for each of
the eight profiles. The LSB weight is 27, which yields a multiplier
range of 0 to 1.9921875 (2 27). The gain extends to nearly a
factor of 2 to provide a means to overcome the intrinsic loss
through the modulator when operating in the quadrature
modulation mode.
In interpolating DAC mode, the OSF should not be programmed
to exceed unity, as clipping can result. Programming the 8-bit
multiplier to unity gain (0x80) bypasses the stage and reduces
power consumption.
14-BIT DAC
The AD9957 incorporates an integrated 14-bit current-output
DAC. The output current is delivered as a balanced signal using
two outputs. The use of balanced outputs reduces the amount of
common-mode noise at the DAC output, increasing signal-to-
noise ratio. An external resistor (RSET) connected between the
DAC_RSET pin and AGND establishes a reference current. The
full-scale output current of the DAC (IOUT) is a scaled version of
the reference current (see the Auxiliary DAC section that
follows).
Proper attention should be paid to the load termination to keep
the output voltage within the specified compliance range, as
voltages developed beyond this range cause excessive distortion
and can damage the DAC output circuitry.
Auxiliary DAC
The full-scale output current of the main DAC (IOUT) is con-
trolled by an 8-bit auxiliary DAC. An 8-bit code word stored in
the appropriate register map location sets IOUT according to the
following equation:
+
=
96
1
4
.
86
CODE
R
I
SET
OUT
(6)
where:
RSET is the value of the RSET resistor (in ohms).
CODE is the 8-bit value supplied to the auxiliary DAC (default
is 127).
For example, with RSET = 10,000 and CODE = 127, IOUT = 20.07 mA.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| GCA22DRMD-S288 | CONN EDGECARD 44POS .125 EXTEND |
| AD9959/PCBZ | BOARD EVALUATION FOR AD9959 |
| ECM12DTKT-S288 | CONN EDGECARD 24POS .156 EXTEND |
| ATWEBDVK-02RC | KIT DEV TCP/IP AT89C51RD2 REMOTE |
| KSZ8862-10FL-EVAL | BOARD EVALUATION KSZ8862-10FL |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9958 | 制造商:AD 制造商全稱:Analog Devices 功能描述:2-Channel 500 MSPS DDS with 10-Bit DACs |
| AD9958 PCB | 制造商:Analog Devices 功能描述:EVAL BOARD ((NS)) |
| AD9958/PCB | 制造商:Analog Devices 功能描述:Evaluation Board For 2-Channel 500 MSPS DDS With 10-Bit DACs 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述:IC 10-BIT DAC DDS |
| AD9958/PCBZ | 功能描述:BOARD EVALUATION FOR AD9958 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:AgileRF™ 標準包裝:1 系列:PSoC® 主要目的:電源管理，熱管理 嵌入式:- 已用 IC / 零件:- 主要屬性:- 次要屬性:- 已供物品:板，CD，電源 |
| AD9958/PCBZ | 制造商:Analog Devices 功能描述:EVAL BOARD, AD9958 DIRECT DIGITAL SYNTHE |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。