參數(shù)資料
型號(hào)： AD9772EB
廠商： Analog Devices, Inc.
英文描述： 14-Bit, 150 MSPS TxDAC⑩ with 2x Interpolation Filter
中文描述： 14位，150 MSPS的TxDAC系列⑩2倍插值濾波器
文件頁(yè)數(shù)： 23/30頁(yè)
文件大?。?/td> 340K
代理商： AD9772EB
REV. 0
AD9772
–23–
DIRECT IF
As discussed in the Digital Modes of Operation section, the
AD9772 can be configured to transform digital data represent-
ing baseband signals into IF signals appearing at odd multiples
of the input data rate (i.e., N
×
f
DATA
where N = 1, 3, . . .). This
is accomplished by configuring the MOD1 and MOD0 digital
inputs HIGH. Note, the maximum DAC update rate of 400MSPS
limits the data input rate in this mode to 100MSPS when the
“zero-stuffing operation” is enabled (i.e., MOD1 High). Appli-
cations requiring higher IFs (i.e., 140 MHz) using higher data
rates should disable the “zeros-stuffing” operation. Also, to
minimize the effects of the PLL Clock Multipliers phase noise
as shown in Figure 27, an external low jitter/phase noise clock
source equal to 4
×
f
DATA
is recommended.
Figure 51 shows the actual output spectrum of the AD9772
reconstructing a 16-QAM test vector with a symbol rate of
5 MSPS. The particular test vector was centered at f
DATA
/4 with
f
DATA
= 100 MSPS, and f
DAC
= 400 MHz. For many applica-
tions, the pair of images appearing around f
DATA
will be more
attractive since they have the flattest passband and highest signal
power. Higher images can also be used with the realization that
these images will have reduced passband flatness, dynamic
range, and signal power, thus reducing the CNR and ACP per-
formance. Figure 52 shows a dual tone SFDR amplitude sweep
at the various IF images with f
DATA
= 100 MSPS and f
DAC
=
400 MHz and the two tones centered around f
DATA
/4. Note,
since an IF filter is assumed to precede the AD9772, the SFDR
was measured over a 25 MHz window around the images occur-
ring at 75 MHz, 125 MHz, 275 MHz and 325 MHz.
FREQUENCY – MHz
0
0
–20
–40
–60
–80
–100
–120
50
100
150
200
250
300
350
400
Figure 51. Spectral Plot of 16-QAM Signal in Direct IF
Mode at f
DATA
= 100 MSPS
A
OUT
– dBFS
85
–15
80
75
70
65
60
55
–12
–9
–6
–3
0
50
45
40
S
IF @ 275MHz
IF @ 75MHz
IF @ 125MHz
IF @ 325MHz
Figure 52. Dual Tone “Windowed” SFDR vs. A
OUT
at
f
DATA
= 100 MSPS
Regardless of what image is selected for a given application, the
adjacent images must be sufficiently filtered. In most cases, a
SAW filter providing differential inputs represents the opti-
mum device for this purpose. For single-ended SAW filters, a
balanced-to-unbalanced RF transformer is recommended. The
AD9772’s high output impedance provides a certain amount of
flexibility in selecting the optimum resistive load, R
LOAD
, as well
as any matching network.
For many applications, the data update rate to the DAC (i.e.,
f
DATA
) must be some fixed integer multiple of some system
reference clock (i.e., GSM – 13 MHz). Furthermore, these
applications prefer to use standard IF frequencies which offer a
large selection of SAW filter choices of varying passbands (i.e.,
70 MHz). These applications may still benefit from the AD9772’s
direct IF mode capabilities when used in conjunction with a
digital upconverter such as the AD6622. Since the AD6622 can
digitally synthesize and tune up to four modulated carriers, it is
possible to judiciously tune these carriers in a region which may
fall within an IF filter’s passband upon reconstruction by the
AD9772. Figure 53 shows an example in which four carriers
were tuned around 18 MHz with a digital upconverter operating
at 52 MSPS such that when reconstructed by the AD9772 in
the IF MODE, these carriers fall around a 70 MHz IF.
FREQUENCY – MHz
0
65
–10
–20
–30
–40
–50
–60
67.5
70
72.5
75
–70
–80
–90
P
–100
Figure 53. Spectral Plot of Four Carriers at 70 MHz IF with
f
DATA
= 52 MSPS, PLLVDD = 0
相關(guān)PDF資料
PDF描述
AD9772A 14-Bit, 160 MSPS TxDAC+ with 2x Interpolation Filter
AD9772AAST 14-Bit, 160 MSPS TxDAC+ with 2x Interpolation Filter
AD9772 14-Bit,150 MSPS T×DAC+TM with 2× Interpolation Filter(單電源,過(guò)采樣,14位D/A轉(zhuǎn)換器)
AD9773 12-Bit, 160 MSPS 2】/4】/8】 Interpolating Dual TxDAC+ D/A Converter
AD9773AST 12-Bit, 160 MSPS 2】/4】/8】 Interpolating Dual TxDAC+ D/A Converter
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD9773 制造商:AD 制造商全稱:Analog Devices 功能描述:Analog Devices: Data Converters: DAC 12-Bit, 10 ns to 100 ns Converters Selection Table
AD9773AST 制造商:AD 制造商全稱:Analog Devices 功能描述:12-Bit, 160 MSPS 2】/4】/8】 Interpolating Dual TxDAC+ D/A Converter
AD9773BSV 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 12-bit 80-Pin TQFP EP 制造商:Rochester Electronics LLC 功能描述:12BIT 160 MSPS DUAL TXDAC+ D/A CONVERTER - Bulk 制造商:Analog Devices 功能描述:IC 12-BIT DAC
AD9773BSVRL 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 12-bit 80-Pin TQFP EP T/R
AD9773BSVZ 功能描述:IC DAC 12BIT DUAL 160MSPS 80TQFP 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(biāo)準(zhǔn)包裝:1 系列:- 設(shè)置時(shí)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
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*