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參數(shù)資料
| 型號： | AD9241ASZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 7/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 14BIT 1.25MSPS 44-MQFP |
| 標準包裝： | 1 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 1.25M |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉換器數(shù)目： | 7 |
| 功率耗散（最大）： | 85mW |
| 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 |
| 供應商設備封裝： | 44-MQFP（10x10） |
| 包裝： | 托盤 |
| 輸入數(shù)目和類型： | 2 個單端，單極；1 個差分，單極 |
| 產(chǎn)品目錄頁面： | 780 (CN2011-ZH PDF) |
AD9241
REV. 0
–15–
of the A/D is 0 V to 5 V. Other input ranges could be selected
by changing VREF, but the A/D’s distortion performance will
degrade slightly as the input common-mode voltage deviates
from its optimum level of 2.5 V.
Alternative AC Interface
Figure 35 shows a flexible ac coupled circuit that can be config-
ured for different input spans. Since the common-mode voltage
of VINA and VINB are biased to midsupply independent of
VREF, VREF can be pin-strapped or reconfigured to achieve
input spans between 2 V and 5 V p-p. The AD9241’s CMRR,
along with the symmetrical coupling R-C networks, will reject
both power supply variations and noise. The resistors, R, estab-
lish 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
F
ceramic and 10
F tantalum capacitor in parallel to achieve a
low cutoff frequency while maintaining a low impedance over a
wide frequency range. RS isolates the buffer amplifier from the
A/D input. The optimum performance is achieved when VINA
and VINB are driven via symmetrical networks. The high-pass
f–3 dB point can be approximated by the equation,
f–3 dB = 1/(2
× π × R/2 × (C1 + C2))
C2
VINA
VINB
AD9241
C1
R
+5V
–5V
RS
VIN
C1
C2
R
RS
+5V
R
+5V
Figure 35. AC-Coupled Input-Flexible Input Span, VCM = 2.5 V
OP AMP SELECTION GUIDE
Op amp selection for the AD9241 is highly dependent on a
particular application. In general, the performance requirements
of any given application can be characterized by either time
domain or frequency domain parameters. In either case, one
should carefully select an op amp that preserves the performance
of the A/D. This task becomes challenging when one considers
the high performance capabilities of the AD9241, coupled with
other external system level requirements such as power con-
sumption and cost.
The ability to select the optimal op amp may be further compli-
cated by limited power supply availability and/or limited accept-
able supplies for a desired op amp. Newer, high performance op
amps typically have input and output range limitations in accor-
dance 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 those
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 AD9241, are also included.
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
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 Sys-
tems, 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
REFERENCE CONFIGURATIONS
The figures associated with this section on internal and external
reference operation do not show recommended matching series
resistors for VINA and VINB for the purpose of simplicity.
Please refer to section Driving the Analog Inputs, Introduction, for
a discussion of this topic. Also, the figures do not show the
decoupling network associated with the CAPT and CAPB pins.
Please refer to the Reference Operation section for a discussion of
the internal reference circuitry and the recommended decoupling
network shown in Figure 27.
USING THE INTERNAL REFERENCE
Single-Ended Input with 0 to 2
VREF Range
Figure 36 shows how to connect the AD9241 for a 0 V to 2 V or
0 V to 5 V input range via pin strapping the SENSE pin. An inter-
mediate input range of 0 to 2
× VREF can be established using
the resistor programmable configuration in Figure 38 and con-
necting VREF to VINB.
In either case, both the common-mode voltage and input span
are directly dependent on the value of VREF. More specifically,
the common-mode voltage is equal to VREF while the input
span is equal to 2
× VREF. Thus, the valid input range extends
from 0 to 2
× VREF. When VINA is ≤ 0 V, the digital output
will be 0000 Hex; when VINA is
≥ 2 × VREF, the digital output
will be 3FFF Hex.
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| AD9241ASZRL | 功能描述:IC ADC 14BIT SGL 1.25MSPS 44MQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 標準包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉換器數(shù)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(shù)目和類型:1 個單端，單極；1 個單端，雙極 |
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