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参数资料
| 型号： | AD7690BRMZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC 18BIT 400KSPS 10MSOP |
| 标准包装： | 1 |
| 系列： | PulSAR® |
| 位数： | 18 |
| 采样率（每秒）： | 400k |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 20mW |
| 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 管件 |
| 输入数目和类型： | 1 个差分，双极 |
| 产品目录页面： | 778 (CN2011-ZH PDF) |
AD7690
Rev. B | Page 20 of 24
CS MODE, 4-WIRE WITH BUSY INDICATOR
This mode is usually used when a single AD7690 is connected
to an SPI-compatible digital host, which has an interrupt input,
and it is desired to keep CNV, which is used to sample the analog
input, independent of the signal used to select the data reading.
This independence is particularly important in applications where
low jitter on CNV is desired.
The connection diagram is shown in Figure 40, and the
corresponding timing is given in Figure 41.
With SDI high, a rising edge on CNV initiates a conversion,
selects the CS mode, and forces SDO to high impedance. In this
mode, CNV must be held high during the conversion phase and
the subsequent data readback. (If SDI and CNV are low, SDO is
driven low.) Prior to the minimum conversion time, SDI can be
used to select other SPI devices, such as analog multiplexers,
but SDI must be returned low before the minimum conversion
time elapses and then held low for the maximum possible
conversion time to guarantee the generation of the busy signal
indicator. When the conversion is complete, SDO goes from
high impedance to low impedance. With a pull-up on the SDO
line, this transition can be used as an interrupt signal to initiate
the data readback controlled by the digital host. The AD7690
then enters the acquisition phase and powers down. The data
bits are clocked out, MSB first, by subsequent SCK falling edges.
The data is valid on both SCK edges. Although the rising edge
can be used to capture the data, a digital host using the SCK
falling edge allows a faster reading rate, provided it has an
acceptable hold time. After the optional 19th SCK falling edge or
SDI going high (whichever occurs first), SDO returns to high
impedance.
DATA IN
IRQ
CLK
CONVERT
CS1
VIO
DIGITAL HOST
47k
CNV
SCK
SDO
SDI
AD7690
05
79
2-
01
7
Figure 40. 4-Wire CS Mode with Busy Indicator Connection Diagram
SDO
D17
D16
D1
D0
tDIS
SCK
1
2
3
171819
tSCK
tSCKL
tSCKH
tHSDO
tDSDO
tEN
CONVERSION
ACQUISITION
tCONV
tCYC
tACQ
ACQUISITION
SDI
CNV
tSSDICNV
tHSDICNV
05
79
2-
01
8
Figure 41. 4-Wire CS Mode with Busy Indicator Serial Interface Timing
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相关代理商/技术参数 |
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| AD7690BRMZ-RL7 | 功能描述:IC ADC 18BIT 400KSPS 10-MSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:PulSAR® 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 |
| AD7690BRNZ | 制造商:Analog Devices 功能描述: |
| AD7691 | 制造商:AD 制造商全称:Analog Devices 功能描述:16-Bit Lower Power |
| AD76911 | 制造商:AD 制造商全称:Analog Devices 功能描述:18-Bit, 2 MSPS PulSAR 15 mW ADC in LFCSP (QFN) |
| AD7691BCPZ-R2 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
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