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| 型号： | AD7441BRMZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/25页 |
| 文件大小： | 0K |
| 描述： | IC ADC 10BIT PSDO IN 1MSPS 8MSOP |
| 标准包装： | 50 |
| 位数： | 10 |
| 采样率（每秒）： | 1M |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 9.25mW |
| 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： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 管件 |
| 输入数目和类型： | 1 个伪差分，单极 |
AD7441/AD7451
Rev. D | Page 14 of 24
TYPICAL CONNECTION DIAGRAM
Figure 22 shows a typical connection diagram for the device.
In this setup, the GND pin is connected to the analog ground
a 2.5 V decoupled reference source. The signal source is connected
to the VIN+ analog input via a unity gain buffer. A dc voltage is
connected to the VIN– pin to provide a pseudo ground for the
VIN+ input. The VDD pin is decoupled to AGND with a 10 μF
tantalum capacitor in parallel with a 0.1 μF ceramic capacitor.
The reference pin is decoupled to AGND with a capacitor of at
least 0.1 μF. The conversion result is output in a 16-bit word
with four leading zeros followed by the MSB of the 12-bit or
10-bit result. The 10-bit result of the AD7441 is followed by two
trailing zeros.
AD7441/
AD7451
0.1F
10F
VREF
VDD
DC INPUT
VOLTAGE
VIN+
SCLK
2.7V TO 5.25V
SUPPLY
SERIAL
INTERFACE
C/P
SDATA
CS
GND
VIN–
2.5V
AD780
VREF
p-p
03
15
3-
0
22
Figure 22. Typical Connection Diagram
ANALOG INPUT
The AD7441/AD7451 have a pseudo differential analog input.
The VIN+ input is coupled to the signal source and must have an
amplitude of VREF p-p to make use of the full dynamic range of
the part. A dc input is applied to the VIN–. The voltage applied to
this input provides an offset from ground or a pseudo ground
for the VIN+ input. Pseudo differential inputs separate the analog
input signal ground from the ADC ground, allowing dc common-
mode voltages to be cancelled.
Because the ADC operates from a single supply, it is necessary
to level shift ground-based bipolar signals to comply with the
input requirements. An op amp (for example, the AD8021) can
be configured to rescale and level shift a ground-based (bipolar)
signal so that it is compatible with the input range of the AD7441/
AD7451 (see Figure 23).
When a conversion takes place, the pseudo ground corresponds
to 0, and the maximum analog input corresponds to 4096 for
the AD7451 and 1024 for the AD7441.
R
2.5V
1.25V
0V
+1.25V
0V
–1.25V
R
3R
0.1F
R
AD7441/
AD7451
VIN+
VIN–
VREF
EXTERNAL
VREF (2.5V)
0
31
53
-0
23
Figure 23. Op Amp Configuration to Level Shift a Bipolar Input Signal
ANALOG INPUT STRUCTURE
Figure 24 shows the equivalent circuit of the analog input
structure of the AD7441/AD7451. The four diodes provide
ESD protection for the analog inputs. Care must be taken to
ensure that the analog input signals never exceed the supply
rails by more than 300 mV. This causes these diodes to become
forward-biased and start conducting into the substrate. These
diodes can conduct up to 10 mA without causing irreversible
damage to the part. The C1 capacitors (see Figure 24) are
typically 4 pF and can be attributed primarily to pin capaci-
tance. The resistors are lumped components made up of
the on resistance of the switches. The value of these resistors
is typically about 100 Ω. The C2 capacitors are the ADC
sampling capacitors and have a capacitance of 16 pF typically.
For ac applications, removing high frequency components from
the analog input signal through the use of an RC low-pass filter
on the relevant analog input pins is recommended. In applica-
tions where harmonic distortion and the signal-to-noise ratio
are critical, it is recommended that the analog input be driven
from a low impedance source. Large source impedances
significantly affect the ac performance of the ADC, which can
necessitate the use of an input buffer amplifier. The choice of
the amplifier is a function of the particular application.
C1
C2
R1
D
C1
C2
R1
D
VDD
VIN+
VIN–
03
15
3-
02
4
Figure 24. Equivalent Analog Input Circuit;
Conversion Phase—Switches Open;
Track Phase—Switches Closed
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| AD7441BRT | 制造商:AD 制造商全称:Analog Devices 功能描述:Pseudo Differential, 1MSPS, 12- & 10-Bit ADCs in 8-lead SOT-23 |
| AD7441BRT-R2 | 功能描述:IC ADC 10BIT W/DIFF INP SOT-23-8 RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 位数:12 采样率（每秒）:3M 数据接口:- 转换器数目:- 功率耗散（最大）:- 电压电源:- 工作温度:- 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-23-6 包装:带卷 (TR) 输入数目和类型:- |
| AD7441BRT-REEL7 | 制造商:Analog Devices 功能描述:ADC Single SAR 1Msps 10-bit Serial 8-Pin SOT-23 T/R |
| AD7441BRTZ-R2 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| AD7441BRTZ-REEL7 | 功能描述:IC ADC 10BIT W/DIFF INP SOT-23-8 RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:2,500 系列:- 位数:16 采样率（每秒）:15 数据接口:MICROWIRE?，串行，SPI? 转换器数目:1 功率耗散（最大）:480µW 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:38-WFQFN 裸露焊盘 供应商设备封装:38-QFN（5x7） 包装:带卷 (TR) 输入数目和类型:16 个单端，双极；8 个差分，双极 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
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