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| 型號： | AD9240ASRL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 9/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 14BIT 10MSPS 44-MQFP |
| 標準包裝： | 800 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 10M |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 7 |
| 功率耗散（最大）： | 330mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 44-QFP |
| 供應(yīng)商設(shè)備封裝： | 44-MQFP（10x10） |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 2 個單端，單極；1 個差分，單極 |
AD9240
REV.
–17–
the resultant VREF output is 2.5 V. The valid input range thus
becomes 0 V to 5 V. The VREF pin should be bypassed to the
REFCOM pin with a 10
F tantalum capacitor in parallel with a
low-inductance 0.1
F ceramic capacitor.
Single-Ended or Differential Input, VCM = 2.5 V
Figure 37 shows the single-ended configuration that gives the
best SINAD performance. To optimize dynamic specifications,
center the common-mode voltage of the analog input at
approximately by 2.5 V by connecting VINB to VREF, a low-
impedance 2.5 V source. As described above, shorting the
SENSE pin directly to the REFCOM pin results in a 2.5 V
reference voltage and a 5 V p-p input span. The valid range
for input signals is 0 V to 5 V. The VREF pin should be by-
passed to the REFCOM pin with a 10
F tantalum capacitor in
parallel with a low inductance 0.1
F ceramic capacitor.
This reference configuration could also be used for a differential
input in which VINA and VINB are driven via a transformer as
shown in Figure 32. In this case, the common-mode voltage,
VCM, is set at midsupply by connecting the transformer’s center
tap to CML of the AD9240. VREF can be configured for 1 V
or 2.5 V by connecting SENSE to either VREF or REFCOM
respectively. Note that the valid input range for each of the
differential inputs is one half of the single-ended input and thus
becomes VCM – VREF/2 to VCM + VREF/2.
0.1 F
10 F
VINA
VINB
VREF
SENSE
REFCOM
AD9240
5V
0V
2.5V
Figure 40. Internal Reference—5 V p-p Input Span,
VCM = 2.5 V
Resistor Programmable Reference
Figure 41 shows an example of how to generate a reference
voltage other than 1 V or 2.5 V with the addition of two external
resistors and a bypass capacitor. Use the equation,
VREF = 1 V
× (1 + R1/R2),
to determine appropriate values for R1 and R2. These resistors
should be in the 2 k
to 100 k range. For the example
shown, R1 equals 2.5 k
and R2 equals 5 k. From the equa-
tion above, the resultant reference voltage on the VREF pin is
1.5 V. This sets the input span to be 3 V p-p. To assure stabil-
ity, place a 0.1
F ceramic capacitor in parallel with R1.
The common-mode voltage can be set to VREF by connecting
VINB to VREF to provide an input span of 0 to 2
× VREF.
Alternatively, the common-mode voltage can be set to 2.5 V
by connecting VINB to a low impedance 2.5 V source. For
the example shown, the valid input signal range for VINA is 1 V
to 4 V since VINB is set to an external, low impedance 2.5 V
source. The VREF pin should be bypassed to the REFCOM pin
with a 10
F tantalum capacitor in parallel with a low induc-
tance 0.1
F ceramic capacitor.
1.5V
C1
0.1 F
10 F
VINA
VINB
VREF
SENSE
REFCOM
AD9240
4V
1V
2.5V
R1
2.5k
R2
5k
0.1 F
Figure 41. Resistor Programmable Reference (3 V p-p
Input Span, VCM = 2.5 V)
USING AN EXTERNAL REFERENCE
Using an external reference may enhance the dc performance of
the AD9240 by improving drift and accuracy. Figures 42
through 44 show examples of how to use an external reference
with the A/D. Table III is a list of suitable voltage references
from Analog Devices. To use an external reference, the user
must disable the internal reference amplifier and drive the
VREF pin. Connecting the SENSE pin to AVDD disables the
internal reference amplifier.
Table III. Suitable Voltage References
Initial
Operating
Output
Drift
Accuracy
Current
Voltage
(ppm/ C)
% (max)
( A)
Internal
1.00
26
1.4
N/A
REF191
2.048
5–25
0.1–0.5
45
Internal
2.50
26
1.4
N/A
REF192
2.50
5–25
0.08–0.4
45
AD780
2.50
3–7
0.04–0.2
1000
The AD9240 contains an internal reference buffer, A2 (see
Figure 29), that simplifies the drive requirements of an external
reference. The external reference must be able to drive a
≈5 k
(
±20%) load. Note that the bandwidth of the reference buffer is
deliberately left small to minimize the reference noise contribu-
tion. As a result, it is not possible to change the reference volt-
age rapidly in this mode without the removal of the CAPT/
CAPB Decoupling Network, and driving these pins directly.
B
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| AD9240ASZ | 功能描述:IC ADC 14BIT 10MSPS 44-MQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1 系列:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)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(yīng)商設(shè)備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類型:8 個單端，單極 產(chǎn)品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| AD9240ASZRL | 功能描述:IC ADC 14BIT 10MSPS 44-MQFP TR RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個單端，雙極 |
| AD9240EB | 制造商:AD 制造商全稱:Analog Devices 功能描述:Complete 14-Bit, 10 MSPS Monolithic A/D Converter |
| AD9240-EB | 制造商:Analog Devices 功能描述: |
| AD9241 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Complete 14-Bit, 1.25 MSPS Monolithic A/D Converter |
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