參數(shù)資料
型號(hào)： AD7715ARZ-5REEL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 24/40頁(yè)
文件大?。?/td> 0K
描述： IC ADC 16BIT 5V 16-SOIC
標(biāo)準(zhǔn)包裝： 1,000
位數(shù)： 16
采樣率（每秒）： 500
數(shù)據(jù)接口： DSP，MICROWIRE?，QSPI?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 9.5mW
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 16-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 16-SOIC W
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 1 個(gè)差分，單極；1 個(gè)差分，雙極
配用： EVAL-AD7715-3EBZ-ND - BOARD EVALUATION FOR AD7715
AD7715
Rev. D | Page 30 of 40
The serial interface can be reset by exercising the RESET input
on the part. It can also be reset by writing a series of 1s on the
DIN input. If a Logic 1 is written to the AD7715 DIN line for
at least 32 serial clock cycles, the serial interface is reset. This
ensures that in three-wire systems that if the interface gets lost
either via a software error or by some glitch in the system, it can
be reset back into a known state. This state returns the interface
to where the AD7715 is expecting a write operation to its com-
munications register. This operation in itself does not reset the
contents of any registers, but because the interface was lost, the
information that was written to any of the registers is unknown
and it is advisable to set up all registers again.
Figure 8 and Figure 9 show timing diagrams for interfacing to
the AD7715 with CS used to decode the part.
is for a
read operation from the AD7715’s output shift register, while
shows a write operation to the input shift register. It is
possible to read the same data twice from the output register
even though the
DRDY line returns high after the first read
operation. Take care, however, to ensure that the read operations
have been completed before the next output update is about to
take place.
The AD7715 serial interface can operate in three-wire mode by
tying the CS input low. In this case, the SCLK, DIN and DOUT
lines are used to communicate with the AD7715 and the status
of DRDY can be obtained by interrogating the MSB of the com-
munications register. This scheme is suitable for interfacing to
microcontrollers. If CS is required as a decoding signal, it can
be generated from a port bit. For microcontroller interfaces, it is
recommended that the SCLK idles high between data transfers.
Some microprocessor or microcontroller serial interfaces have
a single serial data line. In this case, it is possible to connect
the DOUT and DIN lines of the AD7715 together and connect
them to the single data line of the processor. A 10 kΩ pull-up
resistor should be used on this single data line. In this case, if
the interface gets lost, because the read and write operations
share the same line the procedure to reset it back to a known
state is somewhat different than described previously. It requires
a read operation of 24 serial clocks followed by a write operation
where a Logic 1 is written for at least 32 serial clock cycles to
ensure that the serial interface is back into a known state.
The AD7715 can also be operated with CS used as a frame
synchronization signal. This scheme is suitable for DSP
interfaces. In this case, the first bit (MSB) is effectively clocked
out by CS because CS would normally occur after the falling
edge of SCLK in DSPs. The SCLK can continue to run between
data transfers provided the timing numbers are obeyed.
DOUT
SCLK
CS
DRDY
MSB
t5
t7
t8
t9
LSB
t6
t3
t4
t10
08
51
9-
0
08
Figure 8. Read Cycle Timing Diagram
DIN
SCLK
CS
MSB
LSB
t11
t12
t15
t16
t13
t14
08
51
9-
00
9
Figure 9. Write Cycle Timing Diagram
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