您的位置：维库电子市场网 > Datasheet > AD7663

AD7663 Datasheet

  • AD7663

  • 16-Bit 1 MSPS SAR Unipolar ADC with Ref

  • 1337.63KB

  • 26页

  • AD

阅览下载 纠错 0

扫码查看芯片数据手册

上传产品规格书

PDF预览

PRELIMINARY TECHNICAL DATA
AD7667
Figure TBD
t
1
t
2
Power Supply
CNVST
The AD7667 uses three sets of power supply pins: an analog 5 V
supply AVDD, a digital 5 V core supply DVDD, and a digital
input/output interface supply OVDD. The OVDD supply
allows direct interface with any logic working between 2.7 V and
DVDD + 0.3 V. To reduce the number of supplies needed,
the digital core (DVDD) can be supplied through a simple
RC filter from the analog supply as shown in Figure 5. The
AD7667 is independent of power supply sequencing, once
OVDD does not exceed DVDD by more than 0.3V, and thus
free from supply voltage induced latchup.
POWER DISSIPATION Vs. THROUGHPUT
BUSY
t
4
t
3
t
5
MODE
ACQUIRE
CONVERT
t
6
ACQUIRE
CONVERT
t
7
t
8
Figure 11. Basic Conversion Timing
Operating currents are very low during the acquisition phase,
which allows a significant power saving when the conversion rate
is reduced as shown in Figure 10. This power saving depends on
the mode used. In impulse mode, the AD7667 automatically
reduces its power consumption at the end of each conversion
phase. This feature makes the AD7667 ideal for very low power
battery applications. It should be noted that the digital interface
remains active even during the acquisition phase. To reduce the
operating digital supply currents even further, the digital inputs
need to be driven close to the power supply rails (i.e., DVDD or
DGND) and OVDD should not exceed DVDD by more than
0.3V.
0
-20
-40
In impulse mode, conversions can be automatically initi-
ated. If
CNVST
is held low when BUSY is low, the
AD7667 controls the acquisition phase and then automati-
cally initiates a new conversion. By keeping
CNVST
low,
the AD7667 keeps the conversion process running by itself.
It should be noted that the analog input has to be settled
when BUSY goes low. Also, at power-up,
CNVST
should be brought low once to initiate the conversion pro-
cess. In this mode, the AD7667 could sometimes run
slightly faster then the guaranteed limits in the impulse mode
of 666 kSPS. This feature does not exist in warp or normal
modes.
t
9
RESET
BUSY
-60
-80
-100
-120
-140
-160
1
TO BE
SUPPLIED
DATA
t
8
CNVST
Figure 12. RESET Timing
Figure 10. Power Dissipation vs. Sample Rate
CONVERSION CONTROL
Figure 11 shows the detailed timing diagrams of the conver-
sion process. The AD7667 is controlled by the signal
CNVST
which initiates conversion. Once initiated, it cannot be
restarted or aborted, even by the power-down input PD, until
the conversion is complete. The
CNVST
signal operates
independently of
CS
and
RD
signals.
Although
CNVST
is a digital signal, it should be de-
signed with special care with fast, clean edges, and levels
with minimum overshoot and undershoot or ringing.
It is a good thing to shield the
CNVST
trace with ground and
also to add a low value serial resistor (i.e., 50 ) termination
close to the output of the component that drives this line.
For applications where the SNR is critical,
CNVST
signal
should have a very low jitter. Some solutions to achieve that is
to use a dedicated oscillator for
CNVST
generation or, at least,
to clock it with a high-frequency low-jitter clock as shown in
Figure 5.
DIGITAL INTERFACE
The AD7667 has a versatile digital interface; it can be
interfaced with the host system by using either a serial or
鈥?6鈥?/div>
REV. PrA

AD7663相关型号PDF文件下载

  • 型号
    版本
    描述
    厂商
    下载
  • AD760
    英文版
    16/18-Bit Self-Calibrating Serial/Byte DACPORT
    AD
    AD760
  • AD760
    英文版
    16-18-Bit Self-Calibrating Serial/Byte DACPORT
    AD760
  • AD766
    英文版
    16-Bit DSP DACPORT
    AD
    AD766
  • AD766
    英文版
    16-Bit DSP DACPORT
    AD766
  • AD767
    英文版
    Microprocessor-Compatible 12-Bit D/A Converter
    AD
    AD767
  • AD767
    英文版
    Microprocessor-Compatible 12-Bit D/A Converter
    AD767
  • AD768
    英文版
    16-Bit, 30 MSPS D/A Converter
    AD
    AD768
  • AD768
    英文版
    16-Bit, 30 MSPS D/A Converter
    AD768
  • AD7606
    英文版
    AD7606: 8-Channel DAS with 16-Bit, Bipolar, Simultaneous Sa...
    Analog Devices
    AD7606
  • AD7607
    英文版
    AD7607: 8-Channel DAS with 14-Bit, Bipolar, Simultaneous S...
    Analog Devices
    AD7607
  • AD7610
    英文版
    16-Bit, 250 kSPS, Unipolar/Bipolar Programmable Input PulSAR...
    AD
    AD7610
  • AD7610
    英文版
    16-Bit, 250 kSPS, Unipolar/Bipolar Programmable Input PulSAR...
    AD [Analog...
    AD7610
  • AD7612
    英文版
    16-Bit, 750 kSPS, Unipolar/Bipolar Programmable Input PulSAR...
    AD
    AD7612
  • AD7612
    英文版
    16-Bit, 750 kSPS, Unipolar/Bipolar Programmable Input PulSAR...
    AD [Analog...
    AD7612
  • AD7621
    英文版
    16-Bit, 1 LSB INL, 3 MSPS PulSAR ADC
    AD
    AD7621
  • AD7621
    英文版
    16-Bit, 1 LSB INL, 3 MSPS PulSAR?ADC 
    AD7621
  • AD7622
    英文版
    16-Bit, 750 kSPS, Unipolar/Bipolar Programmable Input PulSAR...
    AD
    AD7622
  • AD7622
    英文版
    16-Bit, 750 kSPS, Unipolar/Bipolar Programmable Input PulSAR...
    AD [Analog...
    AD7622
  • AD7623
    英文版
    16-Bit, 750 kSPS, Unipolar/Bipolar Programmable Input PulSAR...
    AD
    AD7623
  • AD7623
    英文版
    16-Bit, 750 kSPS, Unipolar/Bipolar Programmable Input PulSAR...
    AD [Analog...
    AD7623

您可能感兴趣的PDF文件资料

热门IC型号推荐

©2024 维库电子市场网（www.dzsc.com）　备案号：浙B2-20050339-1 经营许可证：浙B2-20210386版权声明
买家服务热线：0571-85317607 | 买家服务部QQ： QQ:1609526468
卖家服务热线：0571-85317607 | 卖家服务部QQ： QQ:331652727

扫码下载APP，
一键连接广大的电子世界。

在线人工客服

买家服务：
卖家服务：

0571-85317607

客服在线时间周一至周五
9:00-17:30

关注官方微信号，
第一时间获取资讯。

建议反馈
返回顶部

建议反馈

联系人：

联系方式：

按住滑块，拖拽到最右边
>>
感谢您向阿库提出的宝贵意见，您的参与是维库提升服务的动力！意见一经采纳，将有感恩红包奉上哦！

PDF纠错X

投诉电话：0571-85317607 投诉QQ：

如选匿名将无法为您反馈投诉结果，建议实名投诉！