MAX1231EVKIT Maxim Integrated Products, MAX1231EVKIT Datasheet - Page 3

• Manufacturer Part Number: MAX1231EVKIT
• Description: EVAL KIT FOR MAX1231
• Manufacturer: Maxim Integrated Products

Specifications of MAX1231EVKIT

• Number Of Adc's: 1
• Number Of Bits: 12
• Sampling Rate (per Second): 300k
• Data Interface: Serial
• Inputs Per Adc: 16 Single Ended or 8 Differential
• Input Range: ±VREF/2
• Power (typ) @ Conditions: 1.86mW @ 300kSPS
• Voltage Supply Source: Single Supply
• Operating Temperature: 0°C ~ 70°C
• Utilized Ic / Part: MAX1231
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

6) Connect a cable from the computer’s serial port to
7) Start the MAX1231 program by opening its icon in
8) Turn on the power supply and slide SW1 to the ON
9) Apply an input signal to AIN0 and click Perform
10) To view a graph of the measurements, pull down
The MAX1231 EV kit provides a proven printed-circuit
board (PCB) layout to facilitate evaluation of the
MAX1231. It must be interfaced to appropriate timing
signals for proper operation. Connect 3V and ground
return to terminal block TB1 (Figure 5). Refer to the
MAX1227/MAX1229/MAX1231 IC data sheet for timing
requirements.
The MAX1231 EV system operates from a user-supplied
7VDC to 20VDC power supply. The evaluation software
runs under Windows 98/2000/XP on a PC, interfacing to
the EV system board through the computer’s serial
communications port (virtual COM port). See the Quick
Start section for setup and operating instructions.
The evaluation software’s main window configures the
data converter and measures the analog inputs. Under
Action, select a scanning sequence, repetitive conver-
sions, or a single conversion. Each selected channel’s
measurement results are displayed in the correspond-
ing Measurement Results field.
The Action setting read single channel repeatedly
requires making a selection under Repetition to deter-
mine how many times the selected channel should be
measured.
the µC module. If using a 9-pin serial port, use a
straight-through, 9-pin female-to-male cable. If the
only available serial port uses a 25-pin connector, a
standard 25-pin to 9-pin adapter is required. The
EV kit software checks the modem status lines
(CTS, DSR, and DCD) to confirm that the corre ct
port has been selected.
the Start | Programs menu.
position on the 68HC16MODULE-DIP module.
Press the OK button to automatically connect and
download the KIT1231.C16 file to the module.
Action. Observe the readout on the screen. To per-
form the action repeatedly, check the every 200ms
checkbox.
the View menu and click Graph.
Detailed Software Description
MAX1231 Evaluation Kit/Evaluation System
MAX1231 Stand-Alone EV Kit
_______________________________________________________________________________________
Detailed Description
MAX1231 EV System
Use Averaging to summarize a series of measurement
results on each selected channel as an arithmetic
mean value. Repetition can be used together with
Averaging to summarize a large number of measure-
ment results as a small number of sample means.
The Low-Level Interface Details panel shows the most
recent low-level register write. A summary of what has
been written to each register is available under the
Low-level registers tab.
The AIN14 and AIN15 channels are automatically
skipped if their alternate functions are selected in the
setup register. The evaluation software updates its dis-
play to show or hide these channels whenever the
alternate functions are enabled or disabled.
The Setup tab configures the alternate functions for the
AIN14 and AIN15 pins, and also configures adjacent
channels as differential input pairs.
The Low-level registers tab summarizes the commands
that create the active configuration. The Reset All
Registers button resets these software-shadowed regis-
ter values and sends the reset command to the MAX1231.
Measurement data can be sampled in external clock
mode. From the Setup tab, set Clock Mode to
0111xxxx ext clock. Then, return to the Measurement
tab and click Get Samples.
To view recently measured data, drop down the View
menu and choose Graph. Data can be viewed as a time
sequence plot, a histogram plot, or as a table of raw
numbers. See Table 1 for available graph commands.
The diagnostics window is used for factory testing prior
to shipping the evaluation kit. It is not meant for cus-
tomer use.
The MAX1231 device under test (U1) is a 12-bit,
300ksps ADC with an internal temperature sensor,
FIFO, and an internal reference. Resistors R1–R16 and
capacitors C1–C16 form single-pole, lowpass, anti-
aliasing filters for each input. Capacitor C17 provides
power-supply bypassing for U1 (Figure 5). Refer to the
MAX1227/MAX1229/MAX1231 data sheet.
The EV kit includes a MAX1615 3V/5V linear regulator
(U2) and a set of MAX1840/MAX1841 level shifters (U3
and U4) to support using the 3V MAX1230 with the 5V µC.
Detailed Hardware Description
Diagnostics Window
Graph Window
Sampling
3