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参数资料
型号： AD7490BRUZ
厂商： Analog Devices Inc
文件页数： 7/29页
文件大小： 0K
描述： IC ADC 12BIT 16CH 1MSPS 28TSSOP
产品变化通告： IDD Specification Change 17/Jun/2009
标准包装： 50
位数： 12
采样率（每秒）： 1M
数据接口： DSP，MICROWIRE?，QSPI?，串行，SPI?
转换器数目： 1
功率耗散（最大）： 12.5mW
电压电源： 单电源
工作温度： -40°C ~ 85°C
安装类型： 表面贴装
封装/外壳： 28-TSSOP（0.173"，4.40mm 宽）
供应商设备封装： 28-TSSOP
包装： 管件
输入数目和类型： 16 个单端，单极
产品目录页面： 778 (CN2011-ZH PDF)
AD7490
Data Sheet
Rev. D | Page 14 of 28
SHADOW REGISTER
The Shadow register on the AD7490 is a 16-bit, write-only
register. Data is loaded from the DIN pin of the AD7490 on the
falling edge of SCLK. The data is transferred on the DIN line at
the same time that a conversion result is read from the part.
This requires 16 serial falling edges for the data transfer. The
information is clocked into the Shadow register, provided the
SEQ and SHADOW bits are set to 0, 1, respectively, in the
previous write to the control register. MSB denotes the first bit
in the data stream. Each bit represents an analog input from
Channel 0 through Channel 15. A sequence of channels can be
selected through which the AD7490 cycles with each consecutive
CS falling edge after the write to the Shadow register. To select a
sequence of channels, the associated channel bit must be set for
each analog input. The AD7490 continuously cycles through
the selected channels in ascending order, beginning with the
lowest channel, until a write operation occurs (that is, the WRITE
bit is set to 1), with the SEQ and SHADOW bits configured in
any way except 1, 0 (see Table 9). The bit functions are outlined
in Table 10.
Figure 12 reflects the normal operation of a multichannel ADC,
where each serial transfer selects the next channel for conversion.
In this mode of operation, the sequencer function is not used.
0269
1-
0
1
DOUT: CONVERSION RESULT FROM
PREVIOUSLY SELECTED CHANNEL ADD3 TO
ADD0
DIN: WRITE TO CONTROL REGISTER,
WRITE BIT = 1,
SELECT CODING, RANGE,AND POWER MODE
SELECT ADD3 TO ADD0 FOR CONVERSION,
SEQ = SHADOW = 0
DIN: WRITE TO CONTROL REGISTER,
WRITE BIT = 1,
SELECT CODING, RANGE, AND POWER MODE
SELECT CHANNEL ADD3 TO ADD0 FOR
CONVERSION,
SEQ = SHADOW = 0
DUMMY CONVERSIONS
DIN = ALL 1s
CS
WRITE BIT = 1,
SEQ = SHADOW = 0
POWER ON
Figure 12. SEQ Bit = 0, SHADOW Bit = 0 Flowchart
Figure 13 shows how to program the AD7490 to continuously
convert on a particular sequence of channels using the Shadow
register. To exit this mode of operation and revert back to the
normal mode of operation of a multichannel ADC (as outlined
in Figure 12), ensure that WRITE = 1 and SEQ = SHADOW = 0
on the next serial transfer.
02
69
1-
0
12
DIN: WRITE TO CONTROL REGISTER,
WRITE BIT = 1,
SELECT CODING, RANGE, AND POWER MODE
SELECT CHANNEL ADD3 TO ADD0 FOR
CONVERSION,
SEQ = 0 SHADOW = 1
CS
DOUT: CONVERSION RESULT FROM
PREVIOUSLY SELECTED CHANNEL ADD3 TO
ADD0
DIN: WRITE TO SHADOW REGISTER,
SELECTING WHICH CHANNELS TO CONVERT
ON; CHANNELS SELECTED NEED NOT BE
CONSECUTIVE
CS
DUMMY CONVERSIONS
DIN = ALL 1s
POWER ON
CS
CONTINUOUSLY
CONVERTS ON THE
SELECTED SEQUENCE
OF CHANNELS BUT
ALLOWS RANGE,
CODING, AND SO ON,
TO CHANGE IN THE
CONTROL REGISTER
WITHOUT
INTERRUPTING THE
SEQUENCE PROVIDED,
SEQ = 1 SHADOW = 0
WRITE BIT = 0
WRITE
BIT = 0
WRITE BIT = 1,
SEQ = 1, SHADOW = 0
WRITE BIT = 1,
SEQ = 1,
SHADOW = 0
CONTINUOUSLY
CONVERTS ON THE
SELECTED SEQUENCE
OF CHANNELS
Figure 13. SEQ Bit = 0, SHADOW Bit = 1 Flowchart
Table 10. Shadow Register
MSB
LSB
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
VIN0
VIN1
VIN2
VIN3
VIN4
VIN5
VIN6
VIN7
VIN8
VIN9
VIN10
VIN11
VIN12
VIN13
VIN14
VIN15
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