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| 型号： | AD7701AN |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT LC2MOS 20-DIP |
| 标准包装： | 18 |
| 位数： | 16 |
| 采样率（每秒）： | 4k |
| 数据接口： | 串行 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 37mW |
| 电压电源： | 模拟和数字，双 ± |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 20-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 20-PDIP |
| 包装： | 管件 |
| 输入数目和类型： | 1 个单端，单极；1 个单端，双极 |
REV. E
–14–
AD7701
AGND
AD7701
AVDD
VREF
10k
0.1F
DVDD
DGND
AVSS
DVSS
0.1F
REF
AD707
0.1F
10V
1V
Figure 17. Single-Supply Operation
SLEEP MODE
The low power standby mode is initiated by taking the
SLEEP
input low, which shuts down all analog and digital circuits and
reduces power consumption to 10
W. The calibration coeffi-
cients are still retained in memory, but as the converter has been
quiescent, it is necessary to wait for the filter settling time (507,904
cycles) before accessing the output data.
DIGITAL INTERFACE
The AD7701’s serial communications port allows easy inter-
facing to industry-standard microprocessors. Three different
modes of operations are available, optimized for different types
of interface.
Synchronous Self-Clocking Mode (SSC)
The SSC mode (MODE pin high) allows easy interfacing to
serial-parallel conversion circuits in systems with parallel data
communication. This mode allows interfacing to 74XX299
universal shift registers without any additional decoding. The
SSC mode can also be used with microprocessors such as the
68HC11 and 68HC05, which allow an external device to clock
their serial port.
Figure 18 shows the timing diagram for SSC mode. Data is
clocked out by an internally generated serial clock. The AD7701
divides each sampling interval into 16 distinct periods. Eight
periods of 64 clock pulses are for analog settling and eight peri-
ods of 64 clock pulses are for digital computation. The status of
CS is polled at the beginning of each digital computation period. If
it is low at any of these times, SCLK will become active and the
data-word currently in the output register will be transmitted,
MSB first. After the LSB has been transmitted,
DRDY goes
high and SDATA goes three-state. If
CS, having been brought
low, is taken high again at any time during data transmission,
SDATA and SCLK will go three-state after the current bit
finishes. If
CS is subsequently brought low, transmission will
resume with the next bit during the subsequent digital computa-
tion period. If transmission has not been initiated and completed
by the time the next data-word is available,
DRDY will go high
for four clock cycles then low again as the new word is loaded
into the output register.
A more detailed diagram of the data transmission in the SSC
mode is shown in Figure 19. Data bits change on the falling
edge of SCLK and are valid on the rising edge of SCLK.
ANALOG SETTLING
DIGITAL COMPUTATION
SCLK (O)
SDATA (O)
HI-Z
MSB
LSB
DRDY (O)
DIGITAL COMPUTATION
CS POLLED
CS (I)
INTERNAL
STATUS
72 CLKIN CYCLES
64 CLKIN CYCLES
1024 CLKIN CYCLES
64 CLKIN CYCLES
Figure 18. Timing Diagram for SSC Data Transmission Mode
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7701ANZ | 功能描述:IC ADC 16BIT LC2MOS 20-DIP 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 |
| AD7701AQ | 制造商:AD 制造商全称:Analog Devices 功能描述:LC2MOS 16-Bit A/D Converter |
| AD7701AR | 功能描述:IC ADC 16BIT LC2MOS 20-SOIC 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 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
| AD7701AR-REEL | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| AD7701ARS | 功能描述:IC ADC 16BIT LC2MOS MONO 28-SSOP 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 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
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