参数资料
型号: AD7607BSTZ
厂商: Analog Devices Inc
文件页数: 21/32页
文件大小: 0K
描述: IC DAS W/ADC 14BIT 8CH 64LQFP
标准包装: 1
类型: 数据采集系统(DAS),ADC
分辨率(位): 14 b
采样率(每秒): 200k
数据接口: DSP,MICROWIRE?,并联,QSPI?,串行,SPI?
电压电源: 模拟和数字
电源电压: 2.3 V ~ 5.25 V,4.75 V ~ 5.25 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 64-LQFP
供应商设备封装: 64-LQFP(10x10)
包装: 托盘
AD7607
Data Sheet
Rev. B | Page 28 of 32
–2
–1
0
CODE
NUM
BE
R
O
F
O
CCURANCE
S
1
2
2000
1800
1600
1400
1200
1000
800
600
400
200
0
AVCC = 5V
VDRIVE = 5V
TA = 25°C
10V RANGE
OS64
08096-
130
Figure 50. Histogram of Codes, Oversampling by 64
If the OS[2:0] pins are set to select an oversampling ratio of 8,
for example, the next CONVST x rising edge takes the first sample
for each channel. The remaining seven samples for all channels
are taken with an internally generated sampling signal. As the
oversampling ratio is increased, the 3 dB frequency is reduced and
the allowed sampling frequency is also reduced (see Table 9). The
OS[2:0] pins should be configured to suit the filtering requirements
of the application.
The CONVST A and CONVST B pins must be tied/driven
together when oversampling is turned on. When the oversampling
function is turned on, the BUSY high time for the conversion
process extends. The actual BUSY high time depends on the over-
sampling rate that is selected: the higher the oversampling rate,
the longer the BUSY high or total conversion time (see Table 3).
Figure 51 shows that the conversion time extends as the over-
sampling rate is increased. To achieve the fastest throughput
rate possible when oversampling is turned on, the read can be
performed during the BUSY high time. The falling edge of BUSY
is used to update the output data registers with the new conversion
data; therefore, the reading of conversion data should not occur on
this edge.
CS
RD
DATA:
DB[15:0]
BUSY
CONVST A
AND
CONVST B
tCYCLE
tCONV
4s
t4
19s
39s
OS = 0 OS = 4 OS = 8
08096-
044
Figure 51. No Oversampling, Oversampling by 4, and Oversampling by 8
Using Read After Conversion
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