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參數資料
| 型號： | AD9221 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 串行ADC |
| 英文描述： | Complete 12-Bit 1.5/3.0/10.0 MSPS Monolithic A/D Converters |
| 中文描述： | 完整的12位1.5/3.0/10.0 MSPS的單片的A / D轉換器 |
| 文件頁數： | 16/28頁 |
| 文件大小： | 350K |
| 代理商： | AD9221 |
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AD9221/AD9223/AD9220
REV. D
–16–
degrade slightly as the input common-mode voltage deviates
from its optimum level of 2.5 V.
Alternative AC Interface
Figure 42 shows a flexible ac coupled circuit which can be con-
figured for different input spans. Since the common-mode
voltage of VINA and VINB are biased to midsupply indepen-
dent of VREF, VREF can be pin-strapped or reconfigured to
achieve input spans between 2 V and 5 V p-p. The AD9221/
AD9223/AD9220’s CMRR along with the symmetrical coupling
R-C networks will reject both power supply variations and noise.
The resistors, R, establish the common-mode voltage. They may
have a high value (e.g., 5 k
) to minimize power consumption
and establish a low cutoff frequency. The capacitors, C1
and
C2, are typically a 0.1
μ
F ceramic and 10
μ
F tantalum capacitor
in parallel to achieve a low cutoff frequency while maintaining a
low impedance over a wide frequency range. R
S
isolates the
buffer amplifier from the A/D input. The optimum performance
is achieved when VINA and VINB are driven via Immetrical
networks. The f
–3 dB
point can be approximated by the equation,
f
–3
dB
= 1/(2
×
π
×
R
/2
×
(
C
1 +
C
2))
C2
VINA
VINB
C1
R
+5V
–5V
R
S
V
IN
C1
C2
R
R
S
+5V
R
R
+5V
AD9221/
AD9223/
AD9220
Figure 42. AC-Coupled Input-Flexible Input Span, V
CM
= 2 V
OP AMP SELECTION GUIDE
Op amp selection for the AD9221/AD9223/AD9220 is highly
dependent on a particular application. In general, the perfor-
mance requirements of any given application can be character-
ized by either time domain or frequency domain parameters. In
either case, one should carefully select an op amp which pre-
serves the performance of the A/D. This task becomes challeng-
ing when one considers the AD9221/AD9223/AD9220’s high
performance capabilities coupled with other extraneous system
level requirements such as power consumption and cost.
The ability to select the optimal op amp may be further compli-
cated by either limited power supply availability and/or limited
acceptable
supplies for a desired op amp. Newer, high performance
op amps typically have input and output range limitations in
accordance with their lower supply voltages. As a result, some
op amps will be more appropriate in systems where ac-coupling
is allowable. When dc-coupling is required, op amps without
headroom constraints such as rail-to-rail op amps or ones where
larger supplies can be used should be considered. The following
section describes some op amps currently available from Analog
Devices. The system designer is
always
encouraged to contact
the factory or local sales office to be updated on Analog Devices
latest amplifier product offerings. Highlights of the areas where
the op amps excel and where they may limit the performance of
the AD9221/AD9223/AD9220 is also included.
AD817:
50 MHz Unity GBW, 70 ns Settling to 0.01%, +5 V
to
±
15 V Supplies
Best Applications: Sample Rates < 7 MSPS, Low-
Noise, 5 V p-p Input Range
Limits: THD above 100 kHz
Dual Version of AD817
Best Applications: Differential and/or Low Imped-
ance Input
Drivers, Low Noise
Limits: THD above 100 kHz
130 MHz @ G = +2 BW, 80 ns Settling to 0.01%,
+5 V to
±
15 V Supplies
Best Applications: Sample Rates < 7 MSPS, Low
Noise, 5 V p-p Input Range, Gains
≥
+2
Limits: THD above 100 kHz
Dual Version of AD818
Best Applications: Differential and/or Low Impedance
Input
Drivers, Low Noise, Gains
≥
+2
Limits: THD above 100 kHz
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
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
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
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
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
Rail-to-Rail, 160 MHz Unity GBW, 55 ns Settling
to 0.01%, +5 V Supply, 26 mW
Best Applications: Low Power, Single-Supply Sys-
tems, DC-Coupled, Large Input Range
Limits: Noise with 2 V Input Range
Dual AD8041
Best Applications: Differential and/or Low Imped-
ance Input Drivers
Limits: Noise with 2 V Input Range
AD826:
AD818:
AD828:
AD812:
AD8011:
AD8013:
AD9631:
AD8047:
AD8041:
AD8042:
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相關代理商/技術參數 |
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| AD9221AR | 功能描述:IC ADC 12BIT 1.5MSPS 28-SOIC RoHS:否 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 |
| AD9221AR-REEL | 功能描述:IC ADC 12BIT 1.5MSPS 28-SOIC RoHS:否 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 |
| AD9221ARS | 功能描述:IC ADC 12BIT 1.5MSPS 28-SSOP RoHS:否 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 |
| AD9221ARS-REEL | 功能描述:IC ADC 12BIT 1.5MSPS 28-SSOP RoHS:否 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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