- 您现在的位置：买卖IC网 > PDF目录10346 > AD7440BRTZ-REEL7 (Analog Devices Inc)IC ADC 10BIT DIFF 1MSPS SOT23-8 PDF资料下载
参数资料
| 型号： | AD7440BRTZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/29页 |
| 文件大小： | 0K |
| 描述： | IC ADC 10BIT DIFF 1MSPS SOT23-8 |
| 标准包装： | 1 |
| 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： | SOT-23-8 |
| 供应商设备封装： | SOT-23-8 |
| 包装： | 标准包装 |
| 输入数目和类型： | 1 个差分，单极 |
| 其它名称： | AD7440BRTZ-REEL7DKR |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页当前第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页
AD7440/AD7450A
Rev. C | Page 20 of 28
Example 1
Table 6. Examples of Suitable Voltage References
Output
Voltage (V)
Initial
Accuracy (%)
Operating
Current (μA)
VIN max = VDD + 0.3
VIN max = VREF + VREF/2
Reference
AD780
2.5/3
0.04
1000
If VDD = 5 V, then VIN max = 5.3 V.
Therefore
3 × VREF/2 = 5.3 V
VREF max = 3.5 V
Thus, when operating at VDD = 5 V, the value of VREF can range
from 100 mV to a maximum value of 3.5 V. When VDD = 4.75 V,
VREF max = 3.17 V.
Example 2
VIN max = VDD + 0.3
VIN max = VREF + VREF/2
If VDD = 3 V, then VIN max = 3.3 V.
Therefore,
3 × VREF/2 = 3.3 V
VREF max = 2.2 V
Thus, when operating at VDD = 3 V, the value of VREF can range
from 100 mV to a maximum value of 2.2 V. When VDD = 2.7 V,
VREF max = 2 V.
These examples show that the maximum reference applied to
the AD7440/AD7450A is directly dependent on the value
applied to VDD.
The value of the reference sets the analog input span and the
common-mode voltage range. Errors in the reference source
result in gain errors in the AD7440/AD7450A transfer function
and add to specified full-scale errors on the part. A 0.1 μF
capacitor should be used to decouple the VREF pin to GND.
Table 6 lists examples of suitable voltage references.
03051-A
-038
1
AD780
NC
8
2
VIN
NC
7
3
GND
6
4
TEMP
5
OPSEL
TRIM
VOUT
AD7440/
AD7450A*
VREF
2.5V
NC
VDD
NC
VDD
NC = NO CONNECT
10nF
0.1
μF
0.1
μF
0.1
μF
*ADDITIONAL PINS OMITTED FOR CLARITY
Figure 38. Typical VREF Connection Diagram for VDD = 5 V
ADR421
2.5
0.04
500
ADR420
2.048
0.05
500
SINGLE-ENDED OPERATION
When supplied with a 5 V power supply, the AD7440/AD7450A
can handle a single-ended input. The design of these devices is
optimized for differential operation, so with a single-ended
input, performance degrades. Linearity degrades by typically
0.2 LSB, the full-scale errors degrade typically by 1 LSB, and ac
performance is not guaranteed.
To operate the AD7440/AD7450A in single-ended mode, the
V
input is coupled to the signal source, while the V
IN+
IN–
input is
biased to the appropriate voltage corresponding to the midscale
code transition. This voltage is the common mode, which is a
fixed dc voltage (usually the reference). The VIN+ input swings
around this value and should have a voltage span of 2 × VREF to
make use of the full dynamic range of the part. The input signal
therefore has peak-to-peak values of common mode ±VREF. If
the analog input is unipolar, an op amp in a noninverting unity
gain configuration can be used to drive the VIN+ pin. The ADC
operates from a single supply, so it is necessary to level shift
ground-based bipolar signals to comply with the input
requirements. An op amp can be configured to rescale and level
shift the ground-based bipolar signal, so it is compatible with
the selected input range of the AD7440/AD7450A (Figure 39).
03051-A
-039
R
5V
2.5V
0V
+2.5V
0V
–2.5V
R
0.1
μF
R
AD7440/
AD7450A
VREF
VIN+
VIN–
VIN
EXTERNAL
VREF (2.5V)
Figure 39. Applying a Bipolar Single-Ended Input to the AD7440/AD7450A
相关PDF资料 |
PDF描述 |
|---|---|
| MS3106R22-15S | CONN PLUG 6POS STRAIGHT W/SCKT |
| MAX9719DETE+ | IC AMP AUDIO PWR 1.4W AB 16TQFN |
| TA3MLX | CONN PLUG CORD 3POS MALE MINI |
| MAX9719CETE+ | IC AMP AUDIO PWR 1.4W AB 16TQFN |
| MS27499E12B35SB | CONN RCPT 22POS BOX MNT W/SCKT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7440BRTZ-REEL72 | 制造商:AD 制造商全称:Analog Devices 功能描述:Differential Input, 1 MSPS ADCs in an 8-Lead SOT-23 |
| AD7441 | 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 |
| AD7441_10 | 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 |
| AD7441BRM | 制造商:Analog Devices 功能描述:ADC Single SAR 1Msps 10-bit Serial 8-Pin MSOP 制造商:Rochester Electronics LLC 功能描述:10BIT PSDO DIFF I/PUT,1MSPS SAR ADC I.C. - Bulk 制造商:Analog Devices 功能描述:10BIT SAR ADC DIFF I/P SMD 7441 |
| AD7441BRM-REEL7 | 制造商:Analog Devices 功能描述:ADC Single SAR 1Msps 10-bit Serial 8-Pin MSOP T/R 制造商:Rochester Electronics LLC 功能描述:10BIT PSDO DIFF I/PUT,1MSPS SAR ADC I.C. - Tape and Reel |
发布紧急采购，3分钟左右您将得到回复。