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参数资料
| 型号： | AD7792BRU |
| 厂商： | Analog Devices Inc |
| 文件页数： | 24/33页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT 3CH LP 16-TSSOP |
| 标准包装： | 96 |
| 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）： | 2.5mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 管件 |
| 输入数目和类型： | 3 个差分，单极；3 个差分，双极 |
| 配用： | EVAL-AD7792EBZ-ND - BOARD EVALUATION FOR AD7792 |
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AD7792/AD7793
Rev. B | Page 29 of 32
TEMPERATURE MEASUREMENT USING AN RTD
To optimize a 3-wire RTD configuration, two identically
matched current sources are required. The AD7792/AD7793,
which contain two well-matched current sources, are ideally
suited to these applications. One possible 3-wire configuration
is shown in Figure 21. In this 3-wire configuration, the lead
resistances result in errors if only one current is used, as the
excitation current flows through RL1, developing a voltage error
between AIN1(+) and AIN1(–). In the scheme outlined, the
second RTD current source is used to compensate for the error
introduced by the excitation current flowing through RL1. The
second RTD current flows through RL2. Assuming RL1 and
RL2 are equal (the leads would normally be of the same
material and of equal length), and IOUT1 and IOUT2 match,
the error voltage across RL2 equals the error voltage across RL1,
and no error voltage is developed between AIN1(+) and
AIN1(–). Twice the voltage is developed across RL3 but,
because this is a common-mode voltage, it does not introduce
errors. The reference voltage for the AD7792/AD7793 is also
generated using one of these matched current sources. It is
developed using a precision resistor and applied to the
differential reference pins of the ADC. This scheme ensures that
the analog input voltage span remains ratiometric to the
reference voltage. Any errors in the analog input voltage due to
the temperature drift of the excitation current are compensated
by the variation of the reference voltage.
04
85
5-
0
13
DOUT/RDY
DIN
SCLK
CS
DVDD
SERIAL
INTERFACE
AND
CONTROL
LOGIC
AD7792/AD7793
IOUT1
REFIN(+)
REFIN(–)
AVDD
GND
BAND GAP
REFERENCE
INTERNAL
CLOCK
CLK
GND
AVDD
IN-AMP
BUF
REFIN(+) REFIN(–)
AIN1(+)
AIN1(–)
RREF
IOUT2
RL2
RL1
RTD
RL3
Σ-Δ
ADC
Figure 21. RTD Application Using the AD7792/AD7793
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7792BRU-REEL | 制造商:Analog Devices 功能描述:ADC Single Delta-Sigma 470sps 16-bit Serial 16-Pin TSSOP T/R 制造商:Analog Devices 功能描述:ADC SGL DELTA-SIGMA 0.47KSPS 16BIT SERL 16TSSOP - Tape and Reel |
| AD7792BRUZ | 功能描述:IC ADC 16BIT SIG-DEL 3CH 16TSSOP 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 系列:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘（4x4） 包装:Digi-Reel® 输入数目和类型:8 个单端，单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6 |
| AD7792BRUZ | 制造商:Analog Devices 功能描述:IC ADC 16BIT 470SPS TSSOP-16 |
| AD7792BRUZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:3-Channel, Low Noise, Low Power, 16-/24-Bit ?￡-?? ADC with On-Chip In-Amp and Reference |
| AD7792BRUZ-REEL | 功能描述:IC ADC 16BIT 3CH LP 16-TSSOP 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 |
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