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| 型号： | AD9223ARSZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/32页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 3.0MSPS 28SSOP |
| 标准包装： | 1,500 |
| 位数： | 12 |
| 采样率（每秒）： | 3M |
| 数据接口： | 并联 |
| 转换器数目： | 7 |
| 功率耗散（最大）： | 130mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 2 个单端，单极；1 个差分，单极 |
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REV. E
AD9221/AD9223/AD9220
–23–
APPLICATIONS
Direct IF Down Conversion Using the AD9220
As previously noted, the AD9220’s performance in the differen-
tial mode of operation extends well beyond its baseband region
and into several Nyquist zone regions. Thus, the AD9220 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 AD9220 maintains excellent
dynamic performance (e.g., refer to Figure 17 and 18). The IF
signal 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.
f1 NYQUIST = fSIGNAL
f2 NYQUIST = fSAMPLE – fSIGNAL
f3 NYQUIST = abs (fSAMPLE – fSIGNAL)
f4 NYQUIST = 2
× f
SAMPLE – fSIGNAL
f5 NYQUIST = abs (2
× f
SAMPLE – fSIGNAL)
There are several potential benefits in using the ADC to alias
(i.e., or mix) down a narrow-band 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
dissipation. Second is the ability to apply various DSP tech-
niques to perform such functions as filtering, channel selection,
quadrature demodulation, data reduction, and detection.
One common example is the digitization of a 21.4 MHz IF
using a low jitter 10 MHz sample clock. Using the equation
above for the fifth Nyquist zone, the resultant frequency after
sampling is 1.4 MHz. Figure 33 shows the typical performance
of the AD9220 operating under these conditions. Figure 34
demonstrates how the AD9220 is still able to maintain a high
degree of linearity and SFDR over a wide amplitude.
FREQUENCY – MHz
0
–120
15
AMPLITUDE
–
dB
–40
–60
–80
–20
–100
1
7
8
6
9
2
5
3
4
ENCODE = 10MSPS
AIN = 21.4MHz
Figure 33. IF Sampling a 21.4 MHz Input Using
the AD9220 (VCM = 2.5 V, Input Span = 2 V p-p)
AIN – dB
–50
–40
–30
–20
–10
0
90
80
0
SNR/SFDR
–
dB
40
30
20
10
60
50
70
SFDR
SNR
Figure 34. AD9220 Differential Input SNR/SFDR
vs. Input Amplitude (AIN) @ 21.4 MHz
Multichannel Data Acquisition with Autocalibration
The AD9221/AD9223/AD9220 is well suited for high perfor-
mance, low power data acquisition systems. Aside from its
exceptional ac performance, it exhibits true 12-bit linearity and
temperature drift performance (i.e., excluding internal refer-
ence). Furthermore, the A/D product family provides the system
designer with an upward or downward component selection
path based on power consumption and sampling rate.
A typical multichannel data acquisition system is shown in
Figure 35. Also shown is some additional inexpensive gain and
offset autocalibration circuitry that is often required in high
accuracy data acquisition systems. These additional peripheral
components were selected based on their performance, power
consumption, and cost.
Referring to Figure 35, the AD9221/AD9223/AD9220 is config-
ured for single-ended operation with a 2.5 V p-p input span and
a 2.5 V common-mode voltage using an external, precision 2.5
voltage reference, U1. This configuration and input span allows
the buffer amplifier, U4, to be single supply. Also, it simplifies
the design of the low temperature drift autocalibration circuitry
that uses thin-film resistors for temperature stability and ratio-
metric accuracy. The input of the AD9221/AD9223/AD9220
can be easily configured for a wider span but it should remain
within the input/output swing capabilities of a high speed, rail-
to-rail, single-supply amplifier, U4 (e.g., AD8041).
The gain and offset calibration circuitry is based on two 8-bit,
current-output DAC08s, U3 and U5. The gain calibration
circuitry consisting of U3, and an op amp, U2A, is configured
to provide a low drift nominal 1.25 V reference to the AD9221/
AD9223/AD9220. The resistor values that set the gain calibra-
tion range were selected to provide a nominal adjustment span
of
±128 LSBs with 1 LSB resolution with respect to the A/D. Note
that the bandwidth of the reference is low and, as a result, it is
not possible to change the reference voltage rapidly in this mode.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9223ARZ | 功能描述:IC ADC 12BIT 3.0MSPS 28SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 其它有关文件:TSA1204 View All Specifications 标准包装:1 系列:- 位数:12 采样率（每秒）:20M 数据接口:并联 转换器数目:2 功率耗散（最大）:155mW 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:48-TQFP 供应商设备封装:48-TQFP（7x7） 包装:Digi-Reel® 输入数目和类型:4 个单端，单极；2 个差分，单极 产品目录页面:1156 (CN2011-ZH PDF) 其它名称:497-5435-6 |
| AD9223ARZ-REEL | 功能描述:IC ADC 12BIT 3.0MSPS 28SOIC 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:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
| AD9223-EB | 制造商:Analog Devices 功能描述:EVAL KIT FOR COMPLETE 12-BIT 1.5/3.0/10.0MSPS MONOLITHIC A/D - Bulk |
| AD9224 | 制造商:AD 制造商全称:Analog Devices 功能描述:Complete 12-Bit 40 MSPS Monolithic A/D Converter |
| AD9224ARS | 制造商:Analog Devices 功能描述:Analog/Digital Converter IC Number of Bi |
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