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| 型号： | AD9203ARUZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 10BIT 40MSPS 3V 28-TSSOP |
| 标准包装： | 50 |
| 位数： | 10 |
| 采样率（每秒）： | 40M |
| 数据接口： | 并联 |
| 转换器数目： | 5 |
| 功率耗散（最大）： | 108mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 28-TSSOP |
| 包装： | 管件 |
| 输入数目和类型： | 2 个单端，单极；1 个差分，单极 |
| 产品目录页面： | 780 (CN2011-ZH PDF) |
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AD9203
Rev. B | Page 18 of 28
0
APPLICATIONS
DIRECT IF DOWN CONVERSION
Sampling IF signals above an ADC’s baseband region (i.e., dc to
FS/2) is becoming increasingly popular in communication
applications. This process is often referred to as direct IF down
conversion or undersampling. There are several potential
benefits in using the ADC to alias (or mix) down a narrow band
or wide band IF signal. First and foremost is the elimination of a
complete mixer stage with its associated amplifiers and filters,
reducing cost and power dissipation. Second is the ability to
apply various DSP techniques to perform such functions as
filtering, channel selection, quadrature demodulation, data
reduction, detection, etc. A detailed discussion on using this
technique in digital receivers can be found in Analog Devices
Application Notes AN-301 and AN-302.
In direct IF down conversion applications, one exploits the
inherent sampling process of an ADC in which an IF signal
lying outside the baseband region can be aliased back into the
baseband region in a manner similar to a mixer downconverting
an IF signal. Similar to the mixer topology, an image rejection
filter is required to limit other potential interfering signals from
also aliasing back into the ADC’s baseband region.
A trade-off exists between the complexity of this image
rejection filter and the ADC’s sample rate and dynamic range.
The AD9203 is well suited for various IF sampling applications.
Its low distortion input SHA has a full-power bandwidth
extending to 130 MHz, thus encompassing many popular IF
frequencies. Only the 2 V span should be used for
undersampling beyond 20 MHz. A DNL of ±0.25 LSB
combined with low thermal input referred noise allows the
AD9203 in the 2 V span to provide >59 dB of SNR for a
baseband input sine wave. Also, its low aperture jitter of 1.2 ps
rms ensures minimum SNR degradation at higher IF
frequencies. In fact, the AD9203 is capable of still maintaining
58 dB of SNR at an IF of 70 MHz with a 2 V input span.
To maximize its distortion performance, the AD9203 should be
configured in the differential mode with a 2 V span using a
transformer. The center-tap of the transformer is biased to the
reference output of the AD9203. Preceding the AD9203 and
transformer is an optional bandpass filter as well as a gain stage.
A low Q passive bandpass filter can be inserted to reduce out of
band distortion and noise that lies within the AD9203’s 390
MHz bandwidth. A large gain stage(s) is often required to
compensate for the high insertion losses of a SAW filter used for
channel selection and image rejection. The gain stage will also
provide adequate isolation for the SAW filter from the charge
kick back currents associated with the AD9203’s switched
capacitor input stage.
The distortion and noise performance of an ADC at the given
IF frequency is of particular concern when evaluating an ADC
for a narrowband IF sampling application. Both single tone and
dual tone SFDR vs. amplitude are very useful in assessing an
ADC’s dynamic and static nonlinearities. SNR vs. amplitude
performance at the given IF is useful in assessing the ADC’s
noise performance and noise contribution due to aperture jitter.
In any application, one is advised to test several units of the
same device under the same conditions to evaluate the given
applications sensitivity to that particular device. Figure 34 and
Figure 35 combine the dual tone SFDR as well as single tone
SFDR and SNR performances at IF frequencies of 70 MHz, and
130 MHz. Note, the SFDR vs. amplitude data is referenced to
dBFS while the single tone SNR data is referenced to dBc. The
performance characteristics in these figures are representative
of the AD9203 without any preceding gain stage. The AD9203
was operated in the differential mode (via transformer) with a
2 V span and a sample rate of 40 MSPS. The analog supply
(AVDD) and the digital supply (DRVDD) were set to 3.0 V.
0
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00573-034
INPUT POWER LEVEL (dB FULL SCALE)
S
NR/
S
F
DR
(dB)
SFDR 2 TONE
SFDR 1 TONE
SNR
Figure 34. SNR/SFDR for IF @ 70 MHz (Clock = 40 MSPS)
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00573-035
INPUT POWER LEVEL (dB FULL SCALE)
S
NR/
S
F
DR
(dB)
5
SFDR 2 TONE
SFDR 1 TONE
SNR
Figure 35. SNR/SFDR for IF @ 130 MHz (Clock = 40 MSPS)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9203ARUZ | 制造商:Analog Devices 功能描述:IC ADC 10BIT 40MSPS 28TSSOP |
| AD9203ARUZ | 制造商:Analog Devices 功能描述:IC, ADC, 10BIT, 40MSPS, TSSOP-28 |
| AD9203ARUZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:10-Bit, 40 MSPS, 3 V, 74 mW A/D Converter |
| AD9203ARUZRL7 | 功能描述:IC ADC 10BIT CMOS 40MSPS 28TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| AD9203ARUZRL71 | 制造商:AD 制造商全称:Analog Devices 功能描述:10-Bit, 40 MSPS, 3 V, 74 mW A/D Converter |
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