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MAX186DC/D Datasheet

  • MAX186DC/D

  • 低功耗、8通道、串行12位ADC

  • 0頁

  • MAXIM   MAXIM

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Low-Power, 8-Channel,
Serial 12-Bit ADCs
MAX186/MAX188
CS
t
ACQ
SCLK
1
4
8
12
16
20
24
DIN
SSTRB
START SEL2 SEL1 SEL0 UNI/ SCL/ PD1 PD0
BIP DIFF
RB2
RB1
B11
MSB B10
RB3
B0
LSB
DOUT
A/D STATE
IDLE
ACQUISITION
1.5碌s (CLK = 2MHz)
B9
B8
B7
B6
B5
B4
B3
B2
B1
FILLED WITH
ZEROS
IDLE
CONVERSION
Figure 6. 24-Bit External Clock Mode Conversion Timing (SPI, QSPI and Microwire Compatible)
CS
鈥⑩€⑩€?/div>
t
CSH
SCLK
t
CSS
t
CL
t
CH
t
CSH
鈥⑩€⑩€?/div>
t
DS
t
DH
DIN
t
DV
DOUT
鈥⑩€⑩€?/div>
t
DO
鈥⑩€⑩€?/div>
t
TR
Figure 7. Detailed Serial-Interface Timing
Internal and External Clock Modes
The MAX186/MAX188 may use either an external serial
clock or the internal clock to perform the
successive-approximation conversion. In both clock
modes, the external clock shifts data in and out of the
MAX186/MAX188. The T/H acquires the input signal as
the last three bits of the control byte are clocked into
DIN. Bits PD1 and PD0 of the control byte program the
clock mode. Figures 7 through 10 show the timing
characteristics common to both modes.
External Clock
In external clock mode, the external clock not only shifts
data in and out, it also drives the analog-to-digital con-
version steps. SSTRB pulses high for one clock period
after the last bit of the control byte. Successive-approxi-
mation bit decisions are made and appear at DOUT on
each of the next 12 SCLK falling edges (see Figure 6).
SSTRB and DOUT go into a high-impedance state when
CS
goes high; after the next
CS
falling edge, SSTRB will
output a logic low. Figure 8 shows the SSTRB timing in
external clock mode.
The conversion must complete in some minimum time, or
else droop on the sample-and-hold capacitors may
degrade conversion results. Use internal clock mode if the
clock period exceeds 10碌s, or if serial-clock interruptions
could cause the conversion interval to exceed 120碌s.
12
______________________________________________________________________________________

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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