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參數(shù)資料
| 型號： | MAX148 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | +2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs(8通道，133ksps，串行10位A/D轉(zhuǎn)換器) |
| 中文描述： | +2.7V至+5.25V、低功耗、8通道、串行10位ADC |
| 文件頁數(shù)： | 17/20頁 |
| 文件大?。?/td> | 200K |
| 代理商： | MAX148 |
M
+2.7V, Low-Power, 8-Channel,
S erial 10-Bit ADC
______________________________________________________________________________________
17
High-S peed Digital Interfac ing with QS PI
The MAX148 can interface with QSPI using the circuit in
Figure 17 (f
SCLK
= 2.0MHz, C
POL
= 0, C
PHA
= 0). This
QSPI circuit can be programmed to do a conversion on
each of the eight channels. The result is stored in mem-
ory without taxing the CPU, since QSPI incorporates its
own micro-sequencer.
Because the maximum external clock frequency is
2.0MHz, the MAX148 is QSPI compatible up to 2MHz.
TMS320LC3x-to-MAX148 Interface
Figure 18 shows an application circuit to interface the
MAX148 to the TMS320 in external clock mode. The tim-
ing diagram for this interface circuit is shown in Figure 19.
Use the following steps to initiate a conversion in the
MAX148 and to read the results:
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
MAX148
MC683XX
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
SHDN
V
DD
SCLK
CS
DIN
SSTRB
DOUT
DGND
AGND
V
DD
VREF
(POWER SUPPLIES)
SCK
PCS0
MOSI
MISO
CLOCK CONNECTIONS NOT SHOWN
0.1
μ
F
4.7
μ
F
(GND)
0.1
μ
F
ANALOG
INPUTS
+3V
+3V
+2.5V
Figure 17. MAX148 QSPI Connections
+3V
+3V
GND
SUPPLIES
DGND
+3V
DGND
COM
AGND
V
DD
DIGITAL
CIRCUITRY
MAX148
R* = 10
* OPTIONAL
Figure 16. Power-Supply Grounding Connection
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