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参数资料
| 型号： | MAX187 |
| 厂商： | Maxim Integrated Products, Inc. |
| 元件分类： | ADC |
| 英文描述： | +5V, Low-Power, 12-Bit Serial ADCs(8.5μs转换时间，单通道，串行12位A/D转换器) |
| 中文描述： | +5V、低功耗、12位串行ADC |
| 文件页数： | 16/20页 |
| 文件大小： | 177K |
| 代理商： | MAX187 |
M
S PI and Mic rowire
When using SPI or QSPI, set CPOL = 0 and CPHA = 0.
Conversion begins with a
CS
falling edge. DOUT goes
low, indicating a conversion in progress. Wait until
DOUT goes high or the maximum specified 8.5μs con-
version time. Two consecutive 1-byte reads are
required to get the full 12 bits from the ADC. DOUT out-
put data transitions on SCLK’s falling edge and is
clocked into the μP on SCLK’s rising edge.
The first byte contains a leading 1 and 7 bits of conver-
sion result. The second byte contains the remaining 5
bits and 3 trailing 0s. See Figure 13 for connections
and Figure 14 for timing.
QS PI
Set CPOL = CPHA = 0. Unlike SPI, which requires two
1-byte reads to acquire the 12 bits of data from the
ADC, QSPI allows the minimum number of clock cycles
necessary to clock in the data. The MAX187/MAX189
require 13 clock cycles from the μP to clock out the
12 bits of data with no trailing 0s (Figure 15). The maxi-
mum clock frequency to ensure compatibility with QSPI
is 2.77MHz.
Opto-Isolated Interfac e,
S erial-to-Parallel Conversion
Many industrial applications require electrical isolation
to separate the control electronics from hazardous
electrical conditions, provide noise immunity, or pre-
vent excessive current flow where ground disparities
exist between the ADC and the rest of the system.
Isolation amplifiers typically used to accomplish these
tasks are expensive. In cases where the signal is even-
tually converted to a digital form, it is cost effective to
isolate the input using opto-couplers in a serial link.
The MAX187 is ideal in this application because it
includes both T/H amplifier and voltage reference,
operates from a single supply, and consumes very little
power (Figure 16).
+5V, Low-Power, 12-Bit S erial ADCs
16
______________________________________________________________________________________
MAX187
ANALOG
INPUT
SIGNAL
GROUND
4.7
μ
F
5
4
2
1
6
8
7
3
10
μ
F
0.1
μ
F
GND
REF
AIN
VDD
DOUT
SCLK
CS
SHDN
+5V
3k
3k
470
8
7
6
5
1
2
3
4
200
200
+5V
8
7
6
5
1
2
3
4
1
2
3
4
8
7
6
5
+5V ON THIS SIDE OF
BARRIER MUST BE ISOLATED POWER
6N136
6N136
6N136
74HC04
74HC04
8.2k
+5V
14
11
12
10
7
6
5
4
3
2
1
15
16
D11 (MSB)
D10
D9
D8
+5V
0.1
μ
F
CS/START
SCLK/INPUT CLOCK
SER
SCK
RCK
SCLR
QH
QG
QF
QE
QD
QC
QB
QA
13
8
9
7
6
5
4
3
2
1
15
16
+5V
0.1
μ
F
13
8
14
11
12
10
74HC595
74HC595
SER
SCK
RCK
SCLR
QH
QG
QF
QE
QD
QC
QB
QA
QH
′
D0(LSB)
D1
D2
D3
D4
D5
D6
D7
Figure 16. 12-Bit Isolated ADC
相关PDF资料 |
PDF描述 |
|---|---|
| MAX189 | +5V, Low-Power, 12-Bit Serial ADCs(8.5μs转换时间，单通道，串行12位A/D转换器) |
| MAX187ACWE | Fixed-Point Digital Signal Processor 288-BGA MICROSTAR |
| MAX187AMJA | Fixed-Point Digital Signal Processor 288-BGA MICROSTAR |
| MAX187CEPA | +5V, Low-Power, 12-Bit Serial ADCs |
| MAX189CEPA | 031-0560-161 |
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