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參數資料
| 型號： | AD9243* |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 14-Bit Rail-to-Rail DACs with I2C Interface; Package: DFN; No of Pins: 10; Temperature Range: 0°C to +70°C |
| 中文描述： | 完整的14位。 3.0 MSPS的單片A / D轉換 |
| 文件頁數： | 20/24頁 |
| 文件大?。?/td> | 545K |
AD9243
REV. A
–20–
APPLICATIONS
DIRECT IF DOWN CONVERSION USING THE AD9243
As previously noted, the AD9243’s performance in the differen-
tial mode of operation extends well beyond its baseband region
and into several Nyquist zone regions. Hence, the AD9243 may
be well suited as a mix down converter in both narrow and
wideband applications. Various IF frequencies exist over the
frequency range in which the AD9243 maintains excellent dy-
namic performance (e.g., refer to Figure 5 and 6). The IF sig-
nal will be aliased to the ADC’s baseband region due to the
sampling process in a similar manner that a mixer will down
convert an IF signal. For signals in various Nyquist zones, the
following equation may be used to determine the final frequency
after aliasing.
f
1 NYQUIST
= f
SIGNAL
f
2 NYQUIST
= f
SAMPLE
– f
SIGNAL
f
3 NYQUIST
= abs (f
SAMPLE
– f
SIGNAL
)
f
4 NYQUIST
= 2
×
f
SAMPLE
– f
SIGNAL
f
5 NYQUIST
=
abs (2
×
f
SAMPLE
– f
SIGNAL
)
There are several potential benefits in using the ADC to alias
(i.e., mix) down a narrowband or wideband IF signal. First and
foremost is the elimination of a complete mixer stage with its
associated amplifiers and filters, reducing cost and power dissi-
pation. Second is the ability to apply various DSP techniques to
perform such functions as filtering, channel selection, quadra-
ture demodulation, data reduction, and detection.
One common example is the digitization of a 10.7 MHz IF using a
low jitter 2.5 MHz sample clock. Using the equation above for
the fifth Nyquist zone, the resultant frequency after sampling is
700 kHz. Figure 49 shows the typical performance of the
AD9243 operating under these conditions. Figure 50 demon-
strates how the AD9243 is still able to maintain a high degree of
linearity and SFDR over a wide amplitude.
FREQUENCY – MHz
0
–150
1.25
–15
–75
–105
–135
–30
–45
–90
–120
–60
0
1
A
7
4
2
9
Figure 49. IF Sampling a 10.7 MHz Input Using the
AD9243 (V
CM
= 2.5 V, Input Span = 2 V p-p)
AIN – dBFS
S
110
40
–60
0
–50
–40
–30
–20
–10
100
90
80
60
50
70
SFDR – dBc
SFDR – dBFS
Figure 50. AD9243 Differential Input SNR/SFDR vs.
Input Amplitude (AIN) @ 10.7 MHz
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD9243AS | 制造商:Analog Devices 功能描述:ADC Single Pipelined 3Msps 14-bit Parallel 44-Pin MQFP 制造商:Analog Devices 功能描述:IC 14-BIT ADC |
| AD9243ASRL | 制造商:Analog Devices 功能描述:ADC Single Pipelined 3Msps 14-bit Parallel 44-Pin MQFP T/R |
| AD9243ASZ | 功能描述:IC ADC 14BIT 3MSPS 44-MQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:microPOWER™ 位數:8 采樣率（每秒）:1M 數據接口:串行，SPI? 轉換器數目:1 功率耗散（最大）:- 電壓電源:模擬和數字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應商設備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數目和類型:8 個單端，單極 產品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| AD9243ASZRL | 功能描述:IC ADC 14BIT SGL 3MSPS 44MQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率（每秒）:300k 數據接口:并聯 轉換器數目:1 功率耗散（最大）:75mW 電壓電源:單電源 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） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端，單極；1 個單端，雙極 |
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