- 您现在的位置：买卖IC网 > PDF目录10311 > AD7705BRZ-REEL (Analog Devices Inc)IC ADC 16BIT 2CHAN 16SOIC PDF资料下载
参数资料
| 型号： | AD7705BRZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 33/44页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT 2CHAN 16SOIC |
| 标准包装： | 1,000 |
| 位数： | 16 |
| 采样率（每秒）： | 500 |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 1mW |
| 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： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 2 个差分，单极；2 个差分，双极 |
| 配用： | EVAL-AD7705EBZ-ND - BOARD EVALUATION FOR AD7705 |
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页第30页第31页第32页当前第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页
AD7705/AD7706
Rev. C | Page 39 of 44
TEMPERATURE MEASUREMENT
Another application of the AD7705 is temperature measure-
ment. Figure 26 outlines a connection between a thermocouple
and the AD7705. For this application, the AD7705 is operated in
buffered mode to allow large decoupling capacitors on the front
end to eliminate any noise pickup from the thermocouple leads.
When the AD7705 operates in buffered mode, it has a reduced
common-mode range. To place the differential voltage from the
thermocouple on a suitable common-mode voltage, the
AIN1() input of the AD7705 is biased up at the reference
voltage, 2.5 V.
AD7705
VDD
5V
AIN1(+)
AIN1(–)
THERMOCOUPLE
JUNCTION
REF IN(+)
REF IN(–)
GND
MCLK IN
MCLK OUT
RESET
DRDY
REF192
GND
OUTPUT
DOUT DIN
CS
SCLK
5V
01166-026
Figure 26. Temperature Measurement Using the AD7705
Figure 27 shows another example of a temperature measure-
ment application for the AD7705. In this case, the transducer is
a resistive temperature device (RTD), a PT100, and the
arrangement is a 4-lead RTD configuration. There are voltage
drops across lead resistances RL1 and RL4, which shift the
common-mode voltage. There is no voltage drop across lead
resistances RL2 and RL3, because the input current to the
AD7705 is very low. The lead resistances present a small source
impedance; therefore, it is not generally necessary to use the
buffer of the AD7705. If the buffer is required, the common-
mode voltage should be set accordingly by inserting a small
resistance between the bottom end of the RTD and the GND
of the AD7705. In the application shown, an external 400 μA
current source provides the excitation current for the PT100
and generates the reference voltage for the AD7705 via the
6.25 kΩ resistor. Variations in the excitation current do not
affect the circuit, because both the input voltage and the
reference voltage vary ratiometrically with the excitation
current. However, the 6.25 kΩ resistor must have a low
temperature coefficient to avoid errors in the reference
voltage over temperature.
AD7705
VDD
5V
AIN1(+)
AIN1(–)
REF IN(–)
GND
MCLK IN
MCLK OUT
RESET
DRDY
DOUT DIN
CS
SCLK
REF IN(+)
6.25k
Ω
400
μA
RL1
RL2
RL3
RL4
RTD
01166-027
Figure 27. RTD Measurement Using the AD7705
相关PDF资料 |
PDF描述 |
|---|---|
| CXS3102A14S1S | CONN RCPT 3POS PNL MNT SKT |
| VE-BN1-IX-B1 | CONVERTER MOD DC/DC 12V 75W |
| AD9609BCPZRL7-65 | IC ADC 10BIT SPI/SRL 65M 32LFCSP |
| VE-BN1-IW-B1 | CONVERTER MOD DC/DC 12V 100W |
| AD7940BRMZ-REEL7 | IC ADC 14BIT 100KSPS 8MSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7705BRZ-REEL1 | 制造商:AD 制造商全称:Analog Devices 功能描述:3 V/5 V, 1 mW, 2-/3-Channel, 16-Bit, Sigma-Delta ADCs |
| AD7705BRZ-REEL7 | 功能描述:IC ADC 16BIT 2CHAN 16SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| AD7705BRZ-REEL71 | 制造商:AD 制造商全称:Analog Devices 功能描述:3 V/5 V, 1 mW, 2-/3-Channel, 16-Bit, Sigma-Delta ADCs |
| AD7705EB | 制造商:AD 制造商全称:Analog Devices 功能描述:3 V/5 V 1 mW 2-/3-Channel 16-Bit Sigma-Delta ADCs(264.12 k) |
| AD7706 | 制造商:AD 制造商全称:Analog Devices 功能描述:3 V/5 V, 1 mW 2-/3-Channel 16-Bit, Sigma-Delta ADCs |
发布紧急采购，3分钟左右您将得到回复。