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参数资料
| 型号： | EVAL-AD7678CBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 15/28页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD7678 |
| 标准包装： | 1 |
| 系列： | PulSAR® |
| ADC 的数量： | 1 |
| 位数： | 18 |
| 采样率（每秒）： | 100k |
| 数据接口： | 串行，并联 |
| 输入范围： | ±VREF |
| 在以下条件下的电源（标准）： | 31mW @ 100kSPS |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7678 |
| 已供物品： | 板 |
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AD7678
Rev. A | Page 22 of 28
RDC/SDIN = 1
INVSCLK = INVSYNC = 0
D17
D16
D2
D1
D0
X
12
3
16
17
18
BUSY
SYNC
SCLK
SDOUT
CS, RD
CNVST
t3
t1
t17
t14
t15
t19
t20
t21
t16
t22
t23
t24
t27
t26
t25
t18
EXT/INT = 0
03084-0-040
Figure 34. Master Serial Data Timing for Reading (Read Previous Conversion during Convert)
SLAVE SERIAL INTERFACE
External Clock
The AD7678 is configured to accept an externally supplied
serial data clock on the SCLK pin when the EXT/INT pin is
held high. In this mode, several methods can be used to read
the data. The external serial clock is gated by CS. When CS and
RD are both low, the data can be read after each conversion or
during the following conversion. The external clock can be
either a continuous or a discontinuous clock. A discontinuous
clock can be either normally high or normally low when
inactive. Figure 35 and Figure 36 show the detailed timing
diagrams of these methods.
While the AD7678 is performing a bit decision, it is important
that voltage transients not occur on digital input/output pins or
degradation of the conversion result could occur. This is
particularly important during the second half of the conversion
phase because the AD7678 provides error correction circuitry
that can correct for an improper bit decision made during the
first half of the conversion phase. For this reason, it is recom-
mended that when an external clock is being provided, it is a
discontinuous clock that only toggles when BUSY is low or,
more importantly, that it does not transition during the latter
half of BUSY high.
External Discontinuous Clock Data Read after
Conversion
This mode is the most recommended of the serial slave modes.
Figure 35 shows the detailed timing diagrams of this method.
After a conversion is complete, indicated by BUSY returning
low, the result of this conversion can be read while both CS and
RD are low. Data is shifted out MSB first with 18 clock pulses,
and is valid on both the rising and falling edge of the clock.
Among the advantages of this method, the conversion perfor-
mance is not degraded because there are no voltage transients
on the digital interface during the conversion process. Also,
data can be read at speeds up to 40 MHz, accommodating both
slow digital host interface and the fastest serial reading.
Finally, in this mode only, the AD7678 provides a daisy-chain
feature using the RDC/SDIN input pin to cascade multiple
converters together. This feature is useful for reducing
component count and wiring connections when desired (for
instance, in isolated multiconverter applications).
An example of the concatenation of two devices is shown in
Figure 37. Simultaneous sampling is possible by using a
common CNVST signal. It should be noted that the RDC/SDIN
input is latched on the edge of SCLK opposite the one used to
shift out data on SDOUT. Thus, the MSB of the upstream
converter follows the LSB of the downstream converter on the
next SCLK cycle.
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| EVAL-AD7678EDZ | 功能描述:BOARD EVAL FOR AD7678 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:PulSAR® 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| EVAL-AD7679CB | 制造商:Rochester Electronics LLC 功能描述:AD7679 EVAL BOARD 18BIT 570KSPS ADC - Bulk 制造商:Analog Devices 功能描述:AD7679 EVAL BOARD 18BIT 570KSPS ADC |
| EVAL-AD7679CBZ | 功能描述:BOARD EVALUATION FOR AD7679 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:PulSAR® 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| EVAL-AD7679EDZ | 功能描述:BOARD EVAL FOR AD7679 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:PulSAR® 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| EVAL-AD767XCB | 制造商:AD 制造商全称:Analog Devices 功能描述:Evaluation Board AD766X/AD767X |
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