参数资料
| 型号： | AD7927BRU |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 8CH 200KSPS 20TSSOP |
| 标准包装： | 75 |
| 位数： | 12 |
| 采样率（每秒）： | 200k |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 7.5mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-TSSOP |
| 包装： | 管件 |
| 输入数目和类型： | 8 个单端，单极 |
| 配用： | EVAL-AD7927CBZ-ND - BOARD EVALUATION FOR AD7927 |
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AD7927
Data Sheet
Rev. D | Page 20 of 28
AUTO SHUTDOWN (PM1 = 0, PM0 = 1)
In this mode, the AD7927 automatically enters shutdown at the
end of each conversion when the control register is updated.
When the part is in shutdown, the track-and-hold is in hold
mode. Figure 23 shows the general diagram of the operation
of the AD7927 in this mode. In shutdown mode all internal
circuitry on the AD7927 is powered down. The part retains
information in the control register during shutdown. The AD7927
remains in shutdown until the next CS falling edge it receives.
On this CS falling edge, the track-and-hold that was in hold
while the part was in shutdown returns to track. Wake-up time
from auto shutdown is 1 μs maximum, and the user should
ensure that 1 μs has elapsed before attempting a valid conversion.
When running the AD7927 with a 20 MHz clock, one dummy
16 SCLK transfer should be sufficient to ensure the part is fully
powered up. During this dummy transfer, the contents of the
control register should remain unchanged; therefore, the
WRITE bit should be 0 on the DIN line.
Depending on the SCLK frequency used, this dummy transfer
may affect the achievable throughput rate of the part, with every
other data transfer being a valid conversion result. If, for example,
the maximum SCLK frequency of 20 MHz was used, the auto
shutdown mode could be used at the full throughput rate of
200 kSPS without affecting the throughput rate at all. Only a
portion of the cycle time is taken up by the conversion time and
the dummy transfer for wake-up.
In this mode, the power consumption of the part is greatly
reduced with the part entering shutdown at the end of each
conversion. When the control register is programmed to move
into auto shutdown, it does so at the end of the conversion. The
user can move the ADC in and out of the low power state by
controlling the CS signal.
1
SCLK
DOUT
DIN
16
1
16
DUMMY CONVERSION
CHANNEL IDENTIFIER BITS + CONVERSION RESU LT
INVALID DATA
CHANNEL IDENTIFIER BITS + CONVERSION RESU LT
12
03
08
8-
0
23
CONTROL REGISTER IS LOADED ON THE
FIRST 12 CLOCKS, PM1 = 0, PM0 = 1
CONTROL REGISTER SHOULD NOT
CHANGE, WRITE BIT = 0
TO KEEP PART IN THIS MODE, LOAD PM1 = 0, PM0 = 1
IN CONTROL REGISTER OR SET WRITE BIT = 0
DATA INTO CONTROL/SHADOW REGISTER
DATA IN TO CONTROL/SHADOW REGISTER
16
CS
PART ENTERS SHUTDOWN ON CS
RISING EDGE AS PM1 = 0, PM0 = 1
PART BEGINS TO POWER UP
ON CS FALLING EDGE
PART IS FULLY
POWERED UP
PART ENTERS SHUTDOWN ON
CS RISING EDGE AS PM1 = 0, PM0 = 1
Figure 23. Auto Shutdown Mode Operation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7927BRU-REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 12-bit Serial 20-Pin TSSOP T/R 制造商:Analog Devices 功能描述:ADC SGL SAR 200KSPS 12-BIT SERL 20TSSOP - Tape and Reel |
| AD7927BRU-REEL7 | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 12-bit Serial 20-Pin TSSOP T/R |
| AD7927BRUZ | 功能描述:IC ADC 12BIT 8CH 200KSPS 20TSSOP 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 |
| AD7927BRUZ | 制造商:Analog Devices 功能描述:IC 12BIT ADC SMD 7927 TSSOP20 |
| AD7927BRUZ-REEL | 功能描述:IC ADC 12BIT 8CH W/SEQ 20TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:2,500 系列:- 位数:16 采样率（每秒）:15 数据接口:MICROWIRE?，串行，SPI? 转换器数目:1 功率耗散（最大）:480µW 电压电源:单电源 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:38-WFQFN 裸露焊盘 供应商设备封装:38-QFN（5x7） 包装:带卷 (TR) 输入数目和类型:16 个单端，双极；8 个差分，双极 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
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