MAX1294EVKIT Maxim Integrated Products, MAX1294EVKIT Datasheet - Page 13

• Manufacturer Part Number: MAX1294EVKIT
• Description: EVALUATION KIT FOR MAX1294
• Manufacturer: Maxim Integrated Products

Specifications of MAX1294EVKIT

• Number Of Adc's: 1
• Number Of Bits: 12
• Sampling Rate (per Second): 420k
• Data Interface: Parallel
• Inputs Per Adc: 6 Single Ended
• Input Range: ±VREF/2
• Power (typ) @ Conditions: 10mW @ 420kSPS
• Voltage Supply Source: Single Supply
• Operating Temperature: 0°C ~ 70°C
• Utilized Ic / Part: MAX1294, MAX1295
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

To select external clock mode, bits D6 and D7 of the
control byte must be set to 1. Figure 6 shows the clock
and WR timing relationship for internal (Figure 6a) and
external (Figure 6b) acquisition modes with an external
clock. For proper operation, a 100kHz to 7.6MHz clock
frequency with 30% to 70% duty cycle is recommended.
Operating the MAX1294/MAX1296 with clock frequen-
cies lower than 100kHz is not recommended because
the resulting voltage droop across the hold capacitor in
the T/H stage degrades performance.
Figure 6a. External Clock and WR Timing (Internal Acquisition Mode)
Figure 6b. External Clock and WR Timing (External Acquisition Mode)
CLK
CLK
CLK
CLK
WR
WR
WR
WR
with +2.5V Reference and Parallel Interface
t
CWH
ACQMOD = "1"
ACQMOD = "1"
______________________________________________________________________________________
420ksps, +5V, 6-/2-Channel, 12-Bit ADCs
ACQMOD = "0"
ACQMOD = "0"
ACQUISITION STARTS
ACQUISITION STARTS
ACQUISITION STARTS
t
t
DH
DH
External Clock Mode
ACQUISITION STARTS
t
CWS
t
CH
t
CP
t
WR GOES HIGH WHEN CLK IS HIGH
WR GOES HIGH WHEN CLK IS LOW
CL
WR GOES HIGH WHEN CLK IS HIGH
WR GOES HIGH WHEN CLK IS LOW
ACQUISITION ENDS
ACQUISITION ENDS
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.
ACQUISITION ENDS
CONVERSION STARTS
t
CWH
ACQUISITION ENDS
CONVERSION STARTS
ACQMOD = "0"
ACQMOD = "0"
t
CWS
Digital Interface
CONVERSION STARTS
CONVERSION STARTS
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