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| 型号： | AD7708BRU |
| 厂商： | Analog Devices Inc |
| 文件页数： | 37/44页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT R-R 8/10CH 28-TSSOP |
| 标准包装： | 50 |
| 位数： | 16 |
| 采样率（每秒）： | 1.37k |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 3.84mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 28-TSSOP |
| 包装： | 管件 |
| 输入数目和类型： | 4 个差分，单极；4 个差分，双极；8 个伪差分，单极；8 个伪差分，双极 |
| 配用： | EVAL-AD7708EBZ-ND - BOARD EVAL FOR AD7708 |
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REV. 0
–42–
AD7708/AD7718
Converting Single-Ended Inputs
The AD7708/AD7718 generally operates in buffered mode. This
places a restriction of AGND + 100 mV to AVDD – 100 mV on
the absolute and common-mode voltages that can be applied to
any input on the AD7708/AD7718.
Some applications may require the measurement of analog
inputs with respect to AGND. To enable the AD7708/AD7718
to be used in these single-ended applications, the buffer on the
AINCOM can be bypassed. The NEGBUF bit in the mode
register controls the operation of the input buffer on the AINCOM
input when a channel is configured for pseudo-differential mode of
operation. If cleared, the analog negative input (AINCOM) is
unbuffered, allowing it to be tied to AGND in single-ended
input configuration. If this bit is set, the analog negative input
(AINCOM) is buffered, placing a restriction on its common-
mode input range. When AINCOM is unbuffered, signals with a
common-mode range from AGND – 30 mV to AVDD + 30 mV
can be accommodated on this input allowing the end user to
connect the AINCOM input to AGND and perform single-
ended measurements with respect to this input. This unbuffered
input path on the AINCOM provides a dynamic load to the
driving source. Therefore, resistor/capacitor combinations on
this input pin can cause dc gain errors, depending on the output
impedance of the source that is driving the AINCOM input. All
analog inputs still operate in buffered mode and their com-
mon-mode and absolute input voltage is restricted to a range
between AGND + 100 mV and AVDD – 100 mV.
Combined Ratiometric and Absolute Value Measurement
System
The AD7708/AD7718 when operated with CHCON = 0 can be
configured for operation as four fully-differential analog inputs or
eight pseudo-differential analog inputs with two fully-differential
reference inputs. Having the ability to use either REFIN1 or
REFIN2 with any channel during the conversion process allows
the end user to make both absolute and ratiometric measure-
ments as shown in Figure 27. In this example a fully-differential
analog input (AIN1–AIN2) is being converted from a bridge trans-
ducer in a ratiometric manner using REFIN1 as the reference
input for this channel. AIN3 is configured as a pseudo-differential
input channel using REFIN2 to perform an absolute measurement
on the potentiometer. The REFSEL bit in the mode register is
used to select which reference is used with the active channel
during the conversion process. When the AD7708/AD7718 is
configured with CHCON = 1, only one reference (REFIN1) is
available. The contents of the CHCON bit override the REFSEL
bit. If the ADC is configured in five fully-differential or 10
pseudo-differential input channel mode, the REFSEL bit setting
is irrelevant as only REFIN1 is available.
REFIN1(–)
AD7718
REFIN2(+)
REFIN1(+)
AINCOM
AIN1
AIN3
AIN2
REFIN2(–)
GND
EXCITATION VOLTAGE = 4V
WIPER
Figure 27. Absolute and Ratiometric Measurement
System Using AD7718
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| AD7708BRU-REEL | 功能描述:IC ADC 16BIT R-R 8/10CH 28-TSSOP RoHS:否 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 |
| AD7708BRU-REEL7 | 功能描述:IC ADC 16BIT R-R 8/10CH 28-TSSOP RoHS:否 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 |
| AD7708BRUZ | 功能描述:IC ADC 16BIT R-R 8/10CH 28-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 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 |
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