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MAX186DC/D Datasheet

  • MAX186DC/D

  • 低功耗、8通道、串行12位ADC

  • 642.89KB

  • 0頁

  • MAXIM   MAXIM

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Low-Power, 8-Channel,
Serial 12-Bit ADCs
MAX186/MAX188
CS
t
SDV
SSTRB
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t
STR
t
SSTRB
t
SSTRB
SCLK
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PD0 CLOCKED IN
Figure 8. External Clock Mode SSTRB Detailed Timing
CS
SCLK
1
2
3
4
5
6
7
8
9
10
11
12
18
19
20
21
22
23
24
DIN
START SEL2 SEL1 SEL0 UNI/ SCL/ PD1 PD0
DIP DIFF
SSTRB
t
CONV
DOUT
A/D STATE
IDLE
CONVERSION
10碌s MAX
1.5碌s (CLK = 2MHz)
ACQUISITION
B11
MSB B10
B9
B2
B1
B0
LSB
FILLED WITH
ZEROS
IDLE
Figure 9. Internal Clock Mode Timing
Internal Clock
In internal clock mode, the MAX186/MAX188 generate
their own conversion clock internally. This frees the
microprocessor from the burden of running the SAR con-
version clock, and allows the conversion results to be
read back at the processor鈥檚 convenience, at any clock
rate from zero to typically 10MHz. SSTRB goes low at the
start of the conversion and then goes high when the con-
version is complete. SSTRB will be low for a maximum of
10碌s, during which time SCLK should remain low for best
noise performance. An internal register stores data when
the conversion is in progress. SCLK clocks the data out
at this register at any time after the conversion is com-
plete. After SSTRB goes high, the next falling clock edge
will produce the MSB of the conversion at DOUT, fol-
lowed by the remaining bits in MSB-first format (see
Figure 9).
CS
does not need to be held low once a con-
version is started. Pulling
CS
high prevents data from
being clocked into the MAX186/MAX188 and three-
states DOUT, but it does not adversely effect an internal
clock-mode conversion already in progress. When inter-
nal clock mode is selected, SSTRB does not go into a
high-impedance state when
CS
goes high.
Figure 10 shows the SSTRB timing in internal clock
mode. In internal clock mode, data can be shifted in and
out of the MAX186/MAX188 at clock rates exceeding
4.0MHz, provided that the minimum acquisition time, t
AZ
,
is kept above 1.5碌s.
13
______________________________________________________________________________________

MAX186DC/D PDF文件相關(guān)型號

MAX186EVKIT,MAX187BC/D

MAX186DC/D 產(chǎn)品屬性

  • Maxim Integrated Products

  • 1

  • 8

  • SAR

  • 133 KSPs

  • 12 bit

  • Single Ended, Differential

  • 4-Wire (SPI, Microwire, QSPI, TMS320)

  • 4.096 V

  • 6 V

  • - 0.3 V

  • 640 mW

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