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參數資料
| 型號： | AD9221ARZ |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 9/32頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 1.5MSPS 28SOIC |
| 標準包裝： | 27 |
| 位數： | 12 |
| 采樣率（每秒）： | 1.5M |
| 數據接口： | 并聯 |
| 轉換器數目： | 7 |
| 功率耗散（最大）： | 70mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 28-SOIC W |
| 包裝： | 管件 |
| 輸入數目和類型： | 2 個單端，單極；1 個差分，單極 |
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REV. E
AD9221/AD9223/AD9220
–17–
AD828:
Dual Version of AD818
Best Applications: Differential and/or Low Imped-
ance Input
Drivers, Low Noise, Gains
≥ +2
Limits: THD above 100 kHz
AD812:
Dual, 145 MHz Unity GBW, Single-Supply Cur-
rent Feedback, +5 V to
±15 V Supplies
Best Applications: Differential and/or Low Imped-
ance Input Drivers, Sample Rates < 7 MSPS
Limits: THD above 1 MHz
AD8011:
f–3 dB = 300 MHz, +5 V or
±5 V Supplies, Current
Feedback
Best Applications: Single-Supply, AC-DC-Coupled,
Good AC Specs, Low Noise, Low Power (5 mW)
Limits: THD above 5 MHz, Usable Input/Output
Range
AD8013:
Triple, f–3 dB = 230 MHz, +5 V or
±5 V Supplies,
Current Feedback, Disable Function
Best Applications: 3:1 Multiplexer, Good AC Specs
Limits: THD above 5 MHz, Input Range
AD9631:
220 MHz Unity GBW, 16 ns Settling to 0.01%,
± 5 V Supplies
Best Applications: Best AC Specs, Low Noise,
AC-Coupled
Limits: Usable Input/Output Range, Power
Consumption
AD8047:
130 MHz Unity GBW, 30 ns Settling to 0.01%,
±5 V Supplies
Best Applications: Good AC Specs, Low Noise,
AC-Coupled
Limits: THD > 5 MHz, Usable Input Range
AD8041:
Rail-to-Rail, 160 MHz Unity GBW, 55 ns Settling
to 0.01%, 5 V Supply, 26 mW
Best Applications: Low Power, Single-Supply
Systems, DC-Coupled, Large Input Range
Limits: Noise with 2 V Input Range
AD8042:
Dual AD8041
Best Applications: Differential and/or Low Imped-
ance Input Drivers
Limits: Noise with 2 V Input Range
DIFFERENTIAL MODE OF OPERATION
Since not all applications have a signal preconditioned for
differential operation, there is often a need to perform a
single-ended-to-differential conversion. In systems that do not
need to be dc-coupled, an RF transformer with a center tap is
the best method to generate differential inputs for the AD9221/
AD9223/AD9220. It provides all the benefits of operating the
A/D in the differential mode without contributing additional
noise or distortion. An RF transformer also has the added ben-
efit of providing electrical isolation between the signal source
and the A/D.
Note that although a single-ended-to-differential op amp topol-
ogy would allow dc coupling of the input signal, no significant
improvement in THD performance was realized when compared
to the dc single-ended mode of operation up to the AD9221/
AD9223/AD9220’s Nyquist frequency (i.e., fIN < fS/2). Also,
the additional op amp required in the topology tends to increase
the total system noise, power consumption, and cost. Thus, a
single-ended mode of operation is recommended for most appli-
cations requiring dc coupling.
A dramatic improvement in THD and SFDR performance can
be realized by operating the AD9221/AD9223/AD9220 in the
differential mode using a transformer. Figure 17 shows a plot of
THD versus Input Frequency for the differential transformer
coupled circuit for each A/D while Figure 18 shows a plot of
SFDR versus Input Frequency. Both figures demonstrate the
enhancement in spectral performance for the differential-mode
of operation. The performance enhancement between the differen-
tial and single-ended mode is most noteworthy as the input
frequency approaches and goes beyond the Nyquist frequency
(i.e., fIN > fS/2) corresponding to the particular A/D.
The figures are also helpful in determining the appropriate A/D
for Direct IF down conversion or undersampling applications.
Refer to Analog Devices application notes AN-301 and AN-302
for an informative discussion on undersampling. One should
select the A/D that meets or exceeds the distortion performance
requirements measured over the required frequency passband.
For example, the AD9220 achieves the best distortion perfor-
mance over an extended frequency range as a result of its greater
full-power bandwidth and thus would represent the best selec-
tion for an IF undersampling application at 21.4 MHz. Refer to
the Applications section of this data sheet for more detailed
information and characterization of this particular application.
THD
–
dB
FREQUENCY – MHz
–50
–60
–90
1
100
10
–70
–80
AD9221
AD9223
AD9220
Figure 17. AD9221/AD9223/AD9220 THD vs. Input
Frequency (VCM = 2.5 V, 2 V p-p Input Span,
AIN = –0.5 dB)
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| AD9221ARZ-REEL | 功能描述:IC ADC 12BIT 1.5MSPS 28SOIC 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 |
| AD9221-EB | 制造商:Analog Devices 功能描述: 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 |
| AD9222 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Octal, 12-Bit, 40/50 MSPS Serial LVDS 1.8 V A/D Converter |
| AD9222-50EBZ | 制造商:Analog Devices 功能描述:EVAL BD FOR AD9222 - Bulk |
| AD9222-65EB | 制造商:Analog Devices 功能描述: |
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