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參數(shù)資料
型號(hào): AD7858LAN
廠商: ANALOG DEVICES INC
元件分類: ADC
英文描述: 3 V to 5 V Single Supply, 200 kSPS 8-Channel, 12-Bit Sampling ADC
中文描述: 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP24
封裝: 0.300 INCH, PLASTIC, DIP-24
文件頁數(shù): 25/32頁
文件大小: 315K
代理商: AD7858LAN
AD7858/AD7858L
REV. B
–25–
Mode 2 (3-Wire SPI/QSPI Interface Mode)
This is the DEFAULT INTERFACE MODE.
In Figure 33 below we have the timing diagram for interface
Mode 2 which is the SPI/QSPI interface mode. Here the
SYNC
input is active low and may be pulsed or tied permanently low.
If
SYNC
is permanently low, 16 clock pulses must be applied to
the SCLK pin for the part to operate correctly, otherwise with a
pulsed
SYNC
input a continuous SCLK may be applied pro-
vided
SYNC
is low for only 16 SCLK cycles. In Figure 33 the
SYNC
going low disables the three-state on the DOUT pin.
The first falling edge of the SCLK after the
SYNC
going low
clocks out the first leading zero on the DOUT pin. The DOUT
pin is three-stated again a time t
12
after the
SYNC
goes high.
With the DIN pin the data input has to be set up a time t
7
be-
fore the SCLK rising edge as the part samples the input data on
the SCLK rising edge in this case. If resetting the interface is
required, the
SYNC
must be taken high and then low.
t
11
t
12
16
6
5
4
3
2
1
t
10
t
8
t
6
t
9
t
8
t
6
t
3
t
5
THREE-STATE
THREE-STATE
DB0
DB10
DB11
DB12
DB13
DB14
DB15
DB14
DB13
DB12
DB11
DB10
DB0
SYNC
(I/P)
SCLK (I/P)
DOUT (O/P)
DIN (I/P)
POLARITY PIN LOGIC HIGH
t
3
=
0.4
t
SCLK
MIN (NONCONTINUOUS SCLK) 0.4
t
SCLK
ns MIN/MAX (CONTINUOUS SCLK),
t
6
= 75/115ns MAX (5V/3V),
t
7
= 40/60ns MIN (5V/3V),
8
= 20/30ns MIN (5V/3V),
t
= 30/50ns MIN (NONCONTINUOUS SCLK) (5V/3V), (30/50)/0.4
t
SCLK
ns MIN/MAX
(CONTINUOUS SCLK) (5V/3V)
DB15
t
7
Figure 33. SPI/QSPI Mode 2 Timing Diagram for Read/Write Operation
with DIN Input, DOUT Output, and
SYNC
Input
相關(guān)PDF資料
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AD7858LAR 3 V to 5 V Single Supply, 200 kSPS 8-Channel, 12-Bit Sampling ADC
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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