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MAX1294 Fiches technique(PDF) 13 Page - Maxim Integrated Products

No de pièce MAX1294
Description  420ksps, 5V, 6-/2-Channel, 12-Bit ADCs with 2.5V Reference and Parallel Interface
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Fabricant  MAXIM [Maxim Integrated Products]
Site Internet  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1294 Fiches technique(HTML) 13 Page - Maxim Integrated Products

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420ksps, +5V, 6-/2-Channel, 12-Bit ADCs
with +2.5V Reference and Parallel Interface
______________________________________________________________________________________
13
External Clock Mode
To select external clock mode, bits D6 and D7 of the
control byte must be set to zero. Figure 6 shows the
clock and WR timing relationship for internal (Figure 6a)
and external (Figure 6b) acquisition modes with an exter-
nal clock. For proper operation, a 100kHz to 7.6MHz
clock frequency with 30% to 70% duty cycle is recom-
mended. Operating the MAX1294/MAX1296 with clock
frequencies lower than 100kHz is not recommended
because the resulting voltage droop across the hold
capacitor in the T/H stage will degrade performance.
Digital Interface
The input and output data are multiplexed on a three-
state parallel interface (I/O) that can easily be inter-
faced with standard µPs. The signals CS, WR, and RD
control the write and read operations. CS represents
the chip-select signal, which enables a µP to address
the MAX1294/MAX1296 as an I/O port. When high, CS
disables the CLK, WR, and RD inputs and forces the
interface into a high-impedance (high-Z) state.
Figure 6a. External Clock and WR Timing (Internal Acquisition Mode)
Figure 6b. External Clock and WR Timing (External Acquisition Mode)
WR
CLK
CLK
WR
WR GOES HIGH WHEN CLK IS HIGH
WR GOES HIGH WHEN CLK IS LOW
tCWS
tCH
tCL
tCP
tCWH
ACQUISITION STARTS
ACQUISITION STARTS
CONVERSION STARTS
CONVERSION STARTS
ACQUISITION ENDS
ACQUISITION ENDS
ACQMOD = "0"
ACQMOD = "0"
WR
CLK
CLK
WR
WR GOES HIGH WHEN CLK IS HIGH
WR GOES HIGH WHEN CLK IS LOW
tDH
tDH
tCWH
tCWS
ACQUISITION STARTS
ACQUISITION STARTS
CONVERSION STARTS
CONVERSION STARTS
ACQUISITION ENDS
ACQUISITION ENDS
ACQMOD = "1"
ACQMOD = "1"
ACQMOD = "0"
ACQMOD = "0"


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