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MAX149BEAP+ Datasheet

  • MAX149BEAP+

  • IC, ADC, 10BIT, 133KSPS, SSOP-20; Resolution (Bits):10; Samp...

  • 24頁

  • Maxim   Maxim

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+2.7V to +5.25V, Low-Power, 8-Channel,
Serial 10-Bit ADCs
MAX148/MAX149
CS
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t
CSH
SCLK
t
CSS
t
CL
t
CH
t
CSH
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t
DS
t
DH
DIN
t
DV
DOUT
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t
DO
鈥⑩€⑩€?/div>
t
TR
Figure 7. Detailed Serial-Interface Timing
CS
t
SDV
SSTRB
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鈥⑩€⑩€?/div>
t
STR
鈥⑩€⑩€?/div>
鈥⑩€⑩€?/div>
t
SSTRB
t
SSTRB
SCLK
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鈥⑩€⑩€⑩€?/div>
PD0 CLOCKED IN
Figure 8. External Clock Mode SSTRB Detailed Timing
MAX148/MAX149. 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鈥?0 show the timing characteris-
tics common to both modes.
External Clock
In external clock mode, the external clock not only shifts
data in and out, but it also drives the analog-to-digital
conversion steps. SSTRB pulses high for one clock
period after the last bit of the control byte. Succes-
sive-approximation bit decisions are made and appear
at DOUT on each of the next 12 SCLK falling edges
(Figure 6). SSTRB and DOUT go into a high-impedance
12
state when
CS
goes high; after the next
CS
falling edge,
SSTRB outputs a logic low. Figure 8 shows the SSTRB
timing in external clock mode.
The conversion must complete in some minimum time,
or droop on the sample-and-hold capacitors may
degrade conversion results. Use internal clock mode if
the serial-clock frequency is less than 100kHz, or if
serial-clock interruptions could cause the conversion
interval to exceed 120碌s.
Internal Clock
In internal clock mode, the MAX148/MAX149 generate
their own conversion clocks internally. This frees the 碌P
______________________________________________________________________________________

MAX149BEAP+ 產(chǎn)品屬性

  • Lead (SnPb) Finish for COTSObsolescence Mitigation Program

  • 66

  • 集成電路 (IC)

  • 數(shù)據(jù)采集 - 模數(shù)轉換器

  • -

  • 10

  • 133k

  • MICROWIRE?，QSPI?，串行，SPI?

  • 1

  • 640mW

  • 單電源

  • -40°C ~ 85°C

  • 表面貼裝

  • 20-SSOP（0.209"，5.30mm 寬）

  • 20-SSOP

  • 管件

  • 8 個單端，單極；8 個單端，雙極；4 個差分，單極；4 個差分，雙極

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