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| 型号： | EVAL-AD7450CBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 3/22页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD7450 |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 12 |
| 采样率（每秒）： | 1M |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 输入范围： | ±VREF/2 |
| 在以下条件下的电源（标准）： | 9mW @ 1MSPS |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7450 |
| 已供物品： | 板，CD |
| 相关产品： | AD7450BRZ-ND - IC ADC 12BIT DIFF IN 1MSPS 8SOIC AD7450BRMZ-ND - IC ADC 12BIT DIFF IN 1MSPS 8MSOP AD7450ARMZ-ND - IC ADC 12BIT DIFF IN 1MSPS 8MSOP AD7450ABRMZ-ND - IC ADC 12BIT DIFF IN 1MSPS 8MSOP AD7450ARZ-REEL7-ND - IC ADC 12BIT DIFF IN 1MSPS 8SOIC AD7450ARMZ-REEL7-ND - IC ADC 12BIT DIFF IN 1MSPS 8MSOP AD7450ABRTZ-REEL7TR-ND - IC ADC 12BIT DIFF 1MSPS SOT23-8 AD7450ARZ-REEL-ND - IC ADC 12BIT DIFF IN 1MSPS 8SOIC AD7450ARZ-ND - IC ADC 12BIT DIFF-IN 1MSPS 8SOIC AD7450ABRT-R2CT-ND - IC ADC 12BIT W/DIFF INP SOT-23-8 更多... |
AD7450
–11–
CM*
VREF p-p
CM*
*CM = COMMON-MODE VOLTAGE
VIN+
VIN–
VDD
SCLK
SDATA
CS
GND
VREF
SERIAL
INTERFACE
3V/5V
SUPPLY
1.25V/2.5V
VREF
0.1 F
10 F
AD7450
VREF p-p
0.1 F
C/ P
Figure 6. Typical Connection Diagram
THE ANALOG INPUT
The analog input of the AD7450 is fully differential. Differential
signals have a number of benefits over single-ended signals,
including noise immunity based on the device’s common-mode
rejection, improvements in distortion performance, doubling of
the device’s available dynamic range, and flexibility in input ranges
and bias points.
Figure 7 defines the fully differential analog input of the AD7450.
VIN+
AD7450
VIN–
VREF p-p
COMMON-MODE
VOLTAGE
VREF p-p
Figure 7. Differential Input Definition
The amplitude of the differential signal is the difference between
the signals applied to the VIN+ and VIN– pins (i.e., VIN+ – VIN–).
VIN+ and VIN– are simultaneously driven by two signals each of
amplitude VREF that are 180
° out of phase. The amplitude of
the differential signal is therefore –VREF to +VREF p-p
(i.e., 2
VREF). This is regardless of the common mode (CM).
The common mode is the average of the two signals, i.e.,
(VIN+ + VIN–)/2, and is therefore the voltage that the two inputs
are centered on. This results in the span of each input being
CM
± VREF/2. This voltage has to be set up externally and its
range varies with VREF. As the value of VREF increases, the com-
mon-mode range decreases. When driving the inputs with an
amplifier, the actual common-mode range will be determined
by the amplifier’s output voltage swing.
Figures 8 and 9 show how the common-mode range typically
varies with VREF for both a 5 V and a 3 V power supply. The
common mode must be in this range to guarantee the
functionality of the AD7450.
For ease of use, the common mode can be set up to be equal to
VREF, resulting in the differential signal being
±V
REF centered
on VREF. When a conversion takes place, the common mode is
rejected resulting in a virtually noise free signal of amplitude
–VREF to +VREF corresponding to the digital codes of 0 to 4095.
VREF
5.0
0
0.25
0.75
1.75
2.25
2.75
3.25 3.50
1.25
COMMON-MODE
RANGE
–
V
4.5
2.0
1.5
1.0
0.5
3.5
2.5
4.0
3.0
COMMON-MODE RANGE
3.25V
1.75V
Figure 8. Input Common-Mode Range vs. VREF
(VDD = 5 V and VREF (Max) = 3.5 V)
VREF
0
2.0
1.5
1.0
0.5
2.5
3.0
0.25
0.50
1.00
1.25
1.50
2.00
2.20
0.75
1.75
COMMON-MODE
RANGE
–
V
COMMON-MODE RANGE
2V
1V
Figure 9. Input Common-Mode Range vs. VREF (VDD = 3 V
and VREF (Max) = 2.2 V)
Figure 10 shows examples of the inputs to VIN+ and VIN– for
different values of VREF for VDD = 5 V. It also gives the maxi-
mum and minimum common-mode voltages for each reference
value according to Figure 8.
Rev. A
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EVAL-AD7451CB | 制造商:Analog Devices 功能描述:DEV TOOLS, PSEUDO DIFFERENTIAL INPUT MSPS 2BIT ADCS - Bulk |
| EVAL-AD7451CBZ | 功能描述:BOARD EVAL FOR AD7451 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| EVAL-AD7451CBZ3 | 制造商:AD 制造商全称:Analog Devices 功能描述:Pseudo Differential Input, 1 MSPS, 10-/12-Bit ADCs in an 8-Lead SOT-23 |
| EVAL-AD7452CB | 制造商:Analog Devices 功能描述:DEV TOOLS, DIFFERENTIAL INPUT, 555KSPS, 12BIT ADC IN AN 8-LE - Bulk |
| EVAL-AD7452CB3 | 制造商:AD 制造商全称:Analog Devices 功能描述:Differential Input, 555 kSPS 12-Bit ADC in an 8-Lead SOT-23 |
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