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参数资料
| 型号： | AD7946 |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | 14-Bit, 500 kSPS PulSAR⑩ ADC in MSOP/QFN |
| 中文描述： | 14位，500 kSPS的PulSAR系列⑩模数转换器，采用MSOP / QFN封装 |
| 文件页数： | 13/27页 |
| 文件大小： | 301K |
| 代理商： | AD7946 |
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AD7946
Preliminary Technical Data
Rev Pr D | Page 20 of 27
CS Mode 4-Wire, No BUSY Indicator
This mode is usually used when multiple AD7946s are
connected to an SPI compatible digital host.
A connection diagram example using two AD7946s is shown in
Figure 33 and the corresponding timing is given in Figure 34.
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 could
be used to select other SPI devices, such as analog multiplexers,
but SDI must be returned high before the minimum conversion
time and held high until the maximum conversion time to
avoid the generation of the BUSY signal indicator. When the
conversion is complete, the AD7946 enters the acquisition
phase and powers down. Each ADC result can be read by
bringing low its SDI input which consequently outputs the MSB
onto SDO. The remaining data bits are then clocked by
subsequent SCK driving edges. The data is valid on both SCK
edges. Although the nondriving edge can be used to capture the
data, a digital host also using the SCK falling edge will allow a
faster reading rate provided it has an acceptable hold time. After
the 14th SCK falling edge, or when SDI goes high, whichever is
earlier, SDO returns to high impedance and another AD7946
can be read.
CNV
SCK
SDO
SDI
DATA IN
CLK
CS1
CONVERT
CS2
DIGITAL HOST
AD7946
CNV
SCK
SDO
SDI
AD7946
Figure 33. CS Mode 4-Wire, No BUSY Indicator Connection Diagram
04656-P
rC-012
SDO
D13
D12
D11
D1
D0
tDIS
SCK
12
3
26
27
28
tHSDO
tDSDO
tEN
CONVERSION
ACQUISITION
tCONV
tCYC
tACQ
ACQUISITION
SDI(CS1)
CNV
tSSDICNV
tHSDICNV
D1
12
13
tSCK
tSCKL
tSCKH
D0
D13
D12
15
16
14
SDI(CS2)
Figure 34. CS Mode 4-Wire, No BUSY Indicator Serial Interface Timing
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD79461 | 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) |
| AD7946BCP | 制造商:Analog Devices 功能描述:ADC SGL SAR 500KSPS 14BIT SERL 10LFCSP EP - Bulk |
| AD7946BCPRL7 | 制造商:AD 制造商全称:Analog Devices 功能描述:14-Bit, 500 kSPS PulSAR⑩ ADC in MSOP/QFN |
| AD7946BCPWP | 制造商:AD 制造商全称:Analog Devices 功能描述:14-Bit, 500 kSPS PulSAR⑩ ADC in MSOP/QFN |
| AD7946BCPZRL | 功能描述:IC ADC 14BIT 500KSPS 10-LFCSP 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:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
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