参数资料
型号: EVAL-AD7651CBZ
厂商: Analog Devices Inc
文件页数: 14/28页
文件大小: 0K
描述: BOARD EVALUATION FOR AD7651
标准包装: 1
系列: PulSAR®
ADC 的数量: 1
位数: 16
采样率(每秒): 100k
数据接口: 串行,并联
输入范围: 0 ~ 2.5 V
在以下条件下的电源(标准): 16mW @ 100kSPS
工作温度: -40°C ~ 85°C
已用 IC / 零件: AD7651
已供物品:
相关产品: AD7651ASTZ-ND - IC ADC 16BIT 100KSPS 48-LQFP
AD7651ACPZ-ND - IC ADC 16BIT UNIPOLAR 48LFCSP
AD7651ASTZRL-ND - IC ADC 16BIT UNIPOLAR 48LFCSP
AD7651ACPZRL-ND - IC ADC 16BIT UNIPOLAR 48LQFP
AD7651
MASTER SERIAL INTERFACE
Usually, because the AD7651 has a longer acquisition phase than
the conversion phase, the data is read immediately after conversion.
This makes the Master Read After Conversion the most recom-
mended serial mode when it can be used. In this mode, it should be
noted that unlike in other modes, the BUSY signal returns LOW
after the 16 data bits are pulsed out and not at the end of the
conversion phase, which results in a longer BUSY width.
Internal Clock
The AD7651 is configured to generate and provide the serial data
clock SCLK when the EXT/INT pin is held LOW. The AD7651 also
generates a SYNC signal to indicate to the host when the serial data
is valid. The serial clock SCLK and the SYNC signal can be inverted
if desired. Depending on the RDC/SDIN input, the data can be read
after each conversion or during the following conversion. Figure 32
and Figure 33 show detailed timing diagrams of these two modes.
In the Read During Conversion mode, the serial clock and data
toggle at appropriate instants, which minimize potential feed-
through between digital activity and critical conversion decisions
t3
BUSY
SYNC
SCLK
SDOUT
t28
t29
t14
t18
t19
t20
t21
t24
t26
t27
t23
t22
t16
t15
12
3
14
15
16
D15
D14
D2
D1
D0
X
RDC/SDIN = 0
INVSCLK = INVSYNC = 0
t25
t30
02964-0-015
CNVST
CS, RD
EXT/INT = 0
Figure 32. Master Serial Data Timing for Reading (Read after Convert)
EXT/INT = 0
RDC/SDIN = 1
INVSCLK = INVSYNC = 0
t3
t1
t17
t14
t19
t20 t21
t24
t26
t25
t27
t23
t22
t16
t15
D15
D14
D2
D1
D0
X
12
3
14
15
16
t18
BUSY
SYNC
SCLK
SDOUT
02964-0-016
CNVST
CS, RD
Figure 33. Master Serial Data Timing for Reading (Read Previous Conversion during Convert)
Rev. 0 | Page 21 of 28
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