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参数资料
| 型号： | AD7667ACPZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 18/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT UNIPOLAR 48LFCSP |
| 标准包装： | 1 |
| 系列： | PulSAR® |
| 位数： | 16 |
| 采样率（每秒）： | 1M |
| 数据接口： | 串行，并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 145mW |
| 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： | 48-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 48-LFCSP-VQ（7x7） |
| 包装： | 托盘 |
| 输入数目和类型： | 2 个伪差分，单极 |
| 配用： | EVAL-AD7667CBZ-ND - BOARD EVALUATION FOR AD7667 |
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AD7667
Rev. 0 | Page 25 of 28
External Discontinuous Clock Data Read After
Conversion
Though the maximum throughput cannot be achieved using
this mode, it is the most recommended of the serial slave
modes. Figure 41 shows the detailed timing diagrams of this
method. After a conversion is complete, indicated by BUSY
returning LOW, the conversion result can be read while both CS
and RD are LOW. Data is shifted out MSB first with 16 clock
pulses and is valid on the rising and falling edges of the clock.
Among the advantages of this method is the fact that conver-
sion performance is not degraded because there are no voltage
transients on the digital interface during the conversion process.
Another advantage is the ability to read the data at any speed up
to 40 MHz, which accommodates both the slow digital host
interface and the fastest serial reading.
Finally, in this mode only, the AD7667 provides a daisy-chain
feature using the RDC/SDIN pin for cascading multiple con-
verters together. This feature is useful for reducing component
count and wiring connections when desired, as, for instance, in
isolated multiconverter applications.
An example of the concatenation of two devices is shown in
Figure 43. Simultaneous sampling is possible by using a
common CNVST signal. It should be noted that the RDC/SDIN
input is latched on the opposite edge of SCLK of the one used to
shift out the data on SDOUT. Therefore, the MSB of the
“upstream” converter just follows the LSB of the “downstream”
converter on the next SCLK cycle.
SCLK
SDOUT
RDC/SDIN
BUSY
DATA
OUT
AD7667
#1
(DOWNSTREAM)
BUSY
OUT
SCLK
AD7667
#2
(UPSTREAM)
RDC/SDIN
SDOUT
SCLK IN
CNVST IN
03035-
0-
036
CNVST
CS
CNVST
CS
CS IN
Figure 43. Two AD7667s in a Daisy-Chain Configuration
External Clock Data Read During Conversion
Figure 42 shows the detailed timing diagrams of this method.
During a conversion, while both CS and RD are LOW, the result
of the previous conversion can be read. The data is shifted out
MSB first with 16 clock pulses, and is valid on both the rising
and falling edges of the clock. The 16 bits must be read before
the current conversion is complete; otherwise, RDERROR is
pulsed HIGH and can be used to interrupt the host interface to
prevent incomplete data reading. There is no daisy-chain feature
in this mode and the RDC/SDIN input should always be tied
either HIGH or LOW.
To reduce performance degradation due to digital activity, a fast
discontinuous clock (at least 18 MHz when Impulse mode is
used, 25 MHz when Normal mode is used, or 40 MHz when
Warp mode is used) is recommended to ensure that all the bits
are read during the first half of the conversion phase. It is also
possible to begin to read data after conversion and continue to
read the last bits after a new conversion has been initiated. This
allows the use of a slower clock speed like 14 MHz in Impulse
mode, 18 MHz in Normal mode, and 25 MHz in Warp mode.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7667ACPZRL | 功能描述:IC ADC 16BIT UNIPOLAR 48LFCSP 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 |
| AD7667AST | 制造商:Analog Devices 功能描述:ADC Single SAR 1Msps 16-bit Parallel/Serial 48-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:1MSPS, 16-BIT ADC INT REF, 2.5LSB - Tape and Reel 制造商:Analog Devices 功能描述:16BIT ADC INT REF 7667 LQFP48 |
| AD7667ASTRL | 制造商:Analog Devices 功能描述:ADC Single SAR 1Msps 16-bit Parallel/Serial 48-Pin LQFP T/R |
| AD7667ASTZ | 功能描述:IC ADC 16BIT UNIPOLAR 48-LQFP 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 |
| AD7667ASTZ | 制造商:Analog Devices 功能描述:16BIT ADC INT REF 7667 LQFP48 |
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