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参数资料
| 型号： | EVAL-AD7655CBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/28页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD7655 |
| 标准包装： | 1 |
| 系列： | PulSAR® |
| ADC 的数量： | 1 |
| 位数： | 16 |
| 采样率（每秒）： | 1M |
| 数据接口： | 串行，并联 |
| 输入范围： | 0 ~ 2 V |
| 在以下条件下的电源（标准）： | 120mW @ 1MSPS |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7655 |
| 已供物品： | 板，CD |
| 相关产品： | AD7655ACPZRL-ND - IC ADC 16BIT 4CHAN 48LFCSP AD7655ASTZRL-ND - IC ADC 16BIT 4CHAN 48LQFP AD7655ACPZ-ND - IC ADC 16BIT 4CH 48-LFCSP AD7655ASTZ-ND - IC ADC 16BIT 1MSPS QUAD 48-LQFP |
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AD7655
Rev. B | Page 18 of 28
CONVERSION CONTROL
Figure 21 shows a detailed timing diagram of the conversion
process. The AD7655 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 the CS and RD signals.
BUSY
ACQUIRE
t2
t1
t3
t4
t5
t6
t7
t8
CONVERT A
ACQUIRE
CONVERT
CONVERT B
t12
A0
t14
t15
t13
t11
t10
EOC
CNVST
03536-021
MODE
Figure 21. Basic Conversion Timing
Although CNVST is a digital signal, it should be designed with
special care with fast, clean edges and levels, and with minimum
overshoot and undershoot or ringing.
For applications where the SNR is critical, the CNVST signal
should have very low jitter. One solution 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 17.
In impulse mode, conversions can be automatically initiated. If
CNVST is held low when BUSY is low, the AD7655 controls the
acquisition phase and automatically initiates a new conversion.
By keeping CNVST low, the AD7655 keeps the conversion
process running by itself. Note 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 process. In this
mode, the AD7655 can sometimes run slightly faster than the
guaranteed limits of 888 kSPS in impulse mode. This feature
does not exist in normal mode.
DIGITAL INTERFACE
The AD7655 has a versatile digital interface; it can be interfaced
with the host system by using either a serial or parallel interface.
The serial interface is multiplexed on the parallel data bus. The
AD7655 digital interface accommodates either 3 V or 5 V logic
when the OVDD supply pin of the AD7655 is connected to the
host system interface digital supply.
The two signals, CS and RD, control the interface. When at
least one of these signals is high, the interface outputs are in
high impedance. Usually CS allows the selection of each
AD7655 in multicircuit applications and is held low in a single
AD7655 design. RD is generally used to enable the conversion
result on the data bus. In parallel mode, signal A/B allows the
choice of reading either the output of Channel A or Channel B,
whereas in serial mode, signal A/B controls which channel is
output first.
Figure 22 details the timing when using the RESET input. Note
the current conversion, if any, is aborted and the data bus is
high impedance while RESET is high.
t9
RESET
DATA
BUS
BUSY
t8
CNVST
03536-022
Figure 22. Reset Timing
PARALLEL INTERFACE
The AD7655 is configured to use the parallel interface when
SER/PAR is held low.
Master Parallel Interface
Data can be read continuously by tying CS and RD low, thus
requiring minimal microprocessor connections. However, in
this mode the data bus is always driven and cannot be used in
shared bus applications (unless the device is held in RESET).
Figure 23 details the timing for this mode.
t1
t3
t4
t17
BUSY
DATA
BUS
t16
NEW A
OR B
PREVIOUS CHANNEL A
OR B
PREVIOUS CHANNEL B
OR NEW A
t10
CS = RD = 0
EOC
CNVST
03536-023
Figure 23. Master Parallel Data Timing for Reading (Continuous Read)
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| EVAL-AD7655EDZ | 功能描述:BOARD EVAL FOR AD7655 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:* 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-AD7656-1CBZ | 功能描述:BOARD EVAL FOR AD7656-1 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:iCMOS® 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-AD7656-1EDZ | 功能描述:BOARD EVAL CONTROL AD7656-1 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:iCMOS® 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-AD7656-1SDZ | 功能描述:数据转换 IC 开发工具 Evaluation Control Board RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
| EVAL-AD7656CB | 制造商:Analog Devices 功能描述: |
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