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參數(shù)資料
| 型號： | MAX145BMJA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | ADC |
| 英文描述： | +2.7V, Low-Power, 2-Channel, 108ksps, Serial 12-Bit ADCs in 8-Pin レMAX |
| 中文描述： | 2-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP8 |
| 封裝： | CERAMIC, DIP-8 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大小： | 240K |
| 代理商： | MAX145BMJA |
DOUT valid timing characteristic. Data should be
clocked into the μP on SCLK’s rising edge.
4) Pull
CS
/SHDN high at or after the 16th falling clock
edge. If
CS
/SHDN remains low, trailing zeros will be
clocked out after the LSB.
5) With
CS
/SHDN high, wait at least 60ns (t
CS
) before
starting a new conversion by pulling
CS
/SHDN low.
A conversion can be aborted by pulling
CS
/SHDN
high before the conversion ends; wait at least 60ns
before starting a new conversion.
Data can be output in two 8-bit sequences or continu-
ously. The bytes will contain the result of the conversion
padded with three leading ones and the channel identi-
fication before the MSB. If the serial clock hasn’t been
idled after the last LSB and
CS
/SHDN is kept low,
DOUT sends trailing zeros.
SPI and MICROWIRE Interface
When using SPI (Figure 8a) or MICROWIRE (Figure 8b)
interfaces, set CPOL = 0 and CPHA = 0. Conversion
begins with a falling edge on
CS
/SHDN (Figure 8c).
Two consecutive 8-bit readings are necessary to obtain
the entire 12-bit result from the ADC. DOUT data transi-
tions on the serial clock’s falling edge and is clocked
into the μP on SCLK’s rising edge. The first 8-bit data
stream contains three leading ones, the channel identi-
M
+2.7V, Low-Power, 2-Channel, 108ksps,
S erial 12-Bit ADCs in 8-Pin μMAX
______________________________________________________________________________________
11
CS/SHDN
SCLK
DOUT
t
CL
t
DV
t
CH
t
SCLKS
HIGH-2
HIGH-2
t
CS
t
DO
t
TR
Figure 7. Detailed Serial-Interface Timing Sequence
MAX144
MAX145
CS/SHDN
SCLK
DOUT
I/O
SK
SI
MICROWIRE
CS/SHDN
SCLK
DOUT
I/O
SCK
MISO
V
DD
SS
MAX144
MAX145
SPI
Figure 8a. SPI Connections
8b. MICROWIRE Connections
CHID D11
D10
D9
D8
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
D7
D6
D5
D4
D3
HIGH-Z
DOUT*
CS/SHDN
SCLK
1ST BYTE READ
2ND BYTE READ
SAMPLING INSTANT
*WHEN CS/SHDN IS HIGH, DOUT = HIGH-Z
MSB
LSB
D2
D1
D0
Figure 8c. SPI/MICROWIRE Interface Timing Sequence (CPOL = CPHA = 0)
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