參數(shù)資料
型號(hào)： MAX1111MJE
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： ADC
英文描述： +2.7V, Low-Power, Multichannel, Serial 8-Bit ADCs
中文描述： 4-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP16
封裝： CERAMIC, DIP-16
文件頁(yè)數(shù)： 12/20頁(yè)
文件大小： 284K
代理商： MAX1111MJE
Simple Software Interface
Make sure the CPU’s serial interface runs in master
mode so the CPU generates the serial clock. Choose a
clock frequency from 50kHz to 500kHz.
1) Set up the control byte for external clock mode and
call it TB1. TB1 should be of the format 1XXXXX11
binary, where the Xs denote the particular channel
and conversion mode selected.
2) Use a general-purpose I/O line on the CPU to pull
CS
low.
3) Transmit TB1 and, simultaneously, receive a byte
and call it RB1. Ignore RB1.
4) Transmit a byte of all zeros ($00 hex) and, simulta-
neously, receive byte RB2.
5) Transmit a byte of all zeros ($00 hex) and, simulta-
neously, receive byte RB3.
6) Pull
CS
high.
Figure 7 shows the timing for this sequence. Bytes RB2
and RB3 contain the result of the conversion padded
with two leading zeros and six trailing zeros. The total
conversion time is a function of the serial-clock
frequency and the amount of idle time between 8-bit
transfers. Make sure that the total conversion time does
not exceed 1ms, to avoid excessive T/H droop.
Digital Inputs
CS
, SCLK, and DIN can accept input signals up to
5.5V, regardless of the supply voltages. This allows the
MAX1110/MAX1111 to accept digital inputs from both
3V and 5V systems.
M
+2.7V, Low-Power, Multic hannel,
S erial 8-Bit ADCs
12
______________________________________________________________________________________
SSTRB
CS
SCLK
DIN
DOUT
1
4
8
12
16
20
24
START
SEL2 SEL1 SEL0
UNI/
BIP
DIF
PD1
PD0
B7
B6
B5
B4
B3
B2
B1
B0
ACQUISITION
4
μ
s
(f
SCLK
= 500kHz)
IDLE
FILLED WITH ZEROS
IDLE
CONVERSION
t
ACQ
A/D STATE
RB1
RB2
RB3
Figure 7. Single-Conversion Timing, External Clock Mode, 24 Clocks
CS
SCLK
DOUT
I/O
SCK
MISO
+3V
SS
a) SPI
CS
SCLK
DOUT
CS
SCK
MISO
+3V
SS
b) QSPI
MAX1110
MAX1111
MAX1110
MAX1111
MAX1110
MAX1111
CS
SCLK
DOUT
I/O
SK
SI
c) MICROWIRE
Figure 6. Common Serial-Interface Connections to the
MAX1110/MAX1111
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