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參數(shù)資料
| 型號： | MAX192 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Power, 8-Channel,Serial 10-Bit ADC(8通道,133ksps串行10位A/D轉(zhuǎn)換器) |
| 中文描述： | 低功耗、8通道、串行10位ADC |
| 文件頁數(shù)： | 11/24頁 |
| 文件大?。?/td> | 211K |
| 代理商： | MAX192 |
External Clock
In external clock mode, the external clock not only
shifts data in and out, it also drives the analog-to-digital
conversion steps. SSTRB pulses high for one clock
period after the last bit of the control byte.
Successive-approximation bit decisions are made and
appear at DOUT on each of the next 12 SCLK falling
edges (see Figure 6). The first 10 bits are the true data
bits, and the last two are sub-LSB bits.
SSTRB and DOUT go into a high-impedance state when
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 10μs, or if serial-clock inter-
ruptions could cause the conversion interval to exceed
120μs.
Internal Clock
In internal clock mode, the MAX192 generates its own
conversion clock internally. This frees the microproces-
sor from the burden of running the SAR conversion
clock, and allows the conversion results to be read
back at the processor’s 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
conversion is complete. SSTRB will be low for a maxi-
mum of 10μs, 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 complete. After SSTRB goes high, the
next falling clock edge will produce the MSB of the
conversion at DOUT, followed by the remaining bits in
held low once a conversion is started.
Pulling –—high prevents data from being clocked into
M
Low-Power, 8-Channel,
S erial 10-Bit ADC
______________________________________________________________________________________
11
0.1μF
V
DD
DGND
AGND
AGND
CS
SCLK
DIN
DOUT
SSTRB
SHDN
+5V
N.C.
0.01μF
CH7
REFADJ
VREF
C2
0.01μF
+2.5V
REFERENCE
C1
4.7μF
D1
1N4148
+5V
0V TO
4.096V
ANALOG
INPUT
+2.5V
**
OSCILLOSCOPE
CH1
CH2
CH3
CH4
* FULL-SCALE ANALOG INPUT, CONVERSION RESULT = $FFF (HEX)
**OPTIONAL. A POTENTIOMETER MAY BE USED IN PLACE OF THE REFERENCE FOR TEST PURPOSES.
MAX192
+5V
2MHz
OSCILLATOR
SCLK
SSTRB
DOUT*
Figure 5. Quick-Look Circuit
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| MAX1920EUT+ | 制造商:Maxim Integrated Products 功能描述:CONV DC-DC SGL-OUT STEP DOWN 6PIN SOT-23 - Rail/Tube 制造商:Maxim Integrated Products 功能描述:Step-down DC-DC converter, MAX1920EUT+ |
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