19-3084; Rev 0; 12/03
MAX1416 Evaluation Kit/
Evaluation System
General Description
The MAX1416 evaluation kit (EV kit) is an assembled and
tested circuit board that demonstrates the MAX1416
multichannel, 16-bit, sigma-delta data-acquisition system.
Windows 98/2000/XP software provides a convenient
user interface to exercise the features of the MAX1416.
Features
♦ Proven PC Board Layout
♦ Complete Evaluation System
®
♦ Convenient On-Board Test Points
♦ Fully Assembled and Tested
Order the complete evaluation system (EV system)
(MAX1416EVC16) for a comprehensive evaluation of the
MAX1416 using a personal computer. Order the EV kit
(MAX1416EVKIT) if the 68HC16MODULE-DIP has been
purchased with a previous Maxim EV system, or for cus-
tom use in other microcontroller (µC)-based systems.
Ordering Information
PART
TEMP RANGE INTERFACE TYPE
To evaluate the MAX1415, request a free sample of the
MAX1415EUE. To evaluate the MX7705, request a free
sample of the MX7705EUE.
MAX1416EVC16
MAX1416EVKIT
0°C to +70°C
0°C to +70°C
Windows software
User supplied
Note: The MAX1416 software is designed for use with the com-
plete EV system (MAX1416EVC16). It includes a 68HC16MOD-
ULE-DIP module and a MAX1416EVKIT. If the MAX1416 evalua-
tion software is not used, the MAX1416EVKIT board can be pur-
chased by itself, without the µC.
MAX1416EVC16 System
Component List
PART
QTY
DESCRIPTION
MAX1416 evaluation kit
68HC16 µC module
MAX1416EVKIT
68HC16MODULE-DIP
1
1
MAX1416EVKIT Parts List
REFERENCE
H1
QTY
1
DESCRIPTION
8-pin header
REFERENCE
QTY
DESCRIPTION
C1–C4, C10,
C11
0.01µF, 10V X7R ceramic capacitors
(radial leaded)
6
J1
1
2 x 20 right-angle socket
2-pin header
JU1
1
0.01µF 10%, 50V X7R ceramic
capacitor (0603)
Taiyo Yuden UMK107B103KZ
TDK C1608X7R1H103KT
JU2
1
2-pin header
C5
1
JU3
1
3-pin header
JU4
1
2-pin header
JU1–JU4
R1–R4
R5, R6
TB1
4
Shunts
4.7µF 20%, 10V X5R ceramic
capacitor (1206)
Taiyo Yuden LMK316BJ475ML
TDK C3216X5R1A475MT
4
10Ω 5% resistors (axial leaded)
10Ω 5% resistors (1206)
0.200in 2-circuit screw terminal
C6
C7, C8
1
2
3
1
2
1
22pF 5%, 50V C0G ceramic
capacitors (0603)
TDK C1608C0G1H220J
0.200in 3-circuit screw terminal
blocks
TB2, TB3
2
U1
U2
1
1
2
MAX1416EUE
MAX873ACSA
MAX1840EUB
0.1µF 10%, 50V X7R ceramic
capacitors (0805)
Taiyo Yuden UMK212BJ104KG
TDK C2012X7R1H104KT
U3, U4
C9, C12, C13
C14
4.9152MHz crystal (HC49/US),
parallel resonant, 20pF load
ECS 49-20-4
Y1
1
1µF, 10V X7R ceramic capacitor
(0805)
TDK C2012X7R1A105K
None
None
1
1
MAX1416 PC board
Software disk, MAX1416
Evaluation Kit
Windows is a registered trademark of Microsoft Corp.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
MAX1416 Evaluation Kit/
Evaluation System
The Setup, Clock, Offset, and Gain tab sheets provide
read/ write access to each of the registers. See
Figures 2–5.
Evaluating the MAX1415
To evaluate the MAX1415, request a free sample of the
MAX1415EUE and replace U1. Follow the Quick Start
procedure, with the following exceptions:
The Comms and Data (Figure 6) tab sheet provides
access to the Standby bit. The comms registers RS2,
RS1, RS0, and R/W bits are automatically set by each
register’s read and write buttons. The channel select
bits CH1 and CH0 are determined by which channel is
selected on the Measurement tab sheet.
• In step 1, leave JU1 and JU2 open.
• In step 3, apply a +3VDC power supply (instead of
+5V) to TB1. Apply an external +1.225VDC differen-
tial reference between TB3 pins 3 and 2.
• After step 10, go to the software’s Measurement tab
sheet and type the new reference voltage of 1.225
next to REF voltage.
Sampling
To collect data, go to the Measurement tab sheet and
click Sample. Select the sample size and click Begin
Sampling. After the samples have been collected, the
data is automatically uploaded to the host and is
graphed. Once displayed, the data can be saved to a
file (optional).
Evaluating the MX7705
To evaluate the MX7705, request a free sample of the
MX7705EUE and replace U1. The MX7705 is similar to
the MAX1415/1416 except it does not support internal
clock mode (INT must always be zero).
Saving Graphs to Disk
Data in the real-time graph and in the sampled data
graphs can be saved to a file (Figures 7–8). Only the
raw output codes are saved, but voltages can be
inferred based on the reference voltage and the maxi-
mum code value.
Using an External Reference
To use an external reference, remove the shunts from
JU1 and JU2, and connect a differential reference
between TB3 pins 3 and 2. The evaluation software
assumes a 2.500V reference voltage, unless otherwise
specified. To override this value, go to the Measurement
tab sheet and type the new reference voltage next to
REF voltage.
Evaluating Power-Down Mode
To enter standby mode, first make sure that Auto Read
is not checked in the Measurement tab sheet. Then go
to the Comms and Data tab sheet and check power-
down, then click write.
Troubleshooting
Problem: No output measurement. System seems to
report zero voltage, or fails to make a measurement.
Reference Voltage
The evaluation software assumes a 2.500V reference
voltage, unless otherwise specified. To override this
value, go to the Measurement tab sheet and type the
new reference voltage next to REF voltage.
Check VDD supply voltage at TB1. The EV kit requires
a separate supply in addition to the supply on the
microcontroller module. Check the reference voltage
using a digital voltmeter. Use an oscilloscope to verify
that the CS, SCLK, and DIN waveforms are correct. If
the DRDY signal is pulsing, then the software has suc-
cessfully initialized the MAX1416 and conversions have
been triggered.
Software Listing
The EV kit software disk contains the driver source and
header file. Refer to DRV1416.cpp and DRV1416.h.
Problem: Cannot see MCLK waveform on oscillo-
scope.
Detailed Description
of Hardware
When using an external crystal, the MCLKIN and
MCLKOUT nodes are very sensitive to extra load
capacitance. Connecting a typical 10x scope probe
effectively doubles the load capacitance from 20pF to
40pF, which can slow down or even halt oscillation.
When using the internal oscillator (clock register INT =
1 and CLKDIS = 0), the oscillator signal is visible on the
MCLKOUT pin. In this mode, MCLKOUT can be mea-
sured using a typical 10x scope probe.
The MAX1416 (U1) is a multichannel, 16-bit, sigma-
delta data-acquisition system. Resistors R1–R4 and
C1–C4 act as anti-aliasing filters. The MAX873 (U2) is a
2.5V reference. C14 ensures the MAX873’s stability for
arbitrary values of input capacitor C11. Level transla-
tors U3 and U4 allow the kit to support the 3V
MAX1415, as well as the 5V MAX1416. The input signal
can be applied directly to terminal blocks TB2 and TB3.
C5 and C6 bypass the analog-to-digital converter’s
power supply. See Figure 9, and refer to the MAX1416
data sheet.
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3
MAX1416 Evaluation Kit/
Evaluation System
Problem: Internal oscillator does not work.
Table 1. Jumper Functions
The internal-oscillator mode is a feature of the
MAX1416/MAX1415 only, and is not supported on the
MX7705. The MX7705 requires an external clock, and
can only be used with INT = 0. To observe the internal
oscillator driving the MCLKOUT pin, U1 must be a
MAX1416 or MAX1415, and the clock register must
have INT = 1 and CLKDIS = 0.
SHUNT
POSITION
JUMPER
FUNCTION
U2 (MAX873) supplies REF+
reference voltage
Closed*
JU1
Open
Closed*
Open
1-2*
REF+ must be externally connected
REF- connects to ground at U2
REF- must be externally connected
MCLKIN connects to crystal Y1
MCLKIN is not connected
JU2
Problem: Measurements are erratic or unstable or
there is poor accuracy.
Check the reference voltage using a digital voltmeter.
Use an oscilloscope to check for noise. When probing
for noise, keep the oscilloscope ground-return lead as
short as possible, preferably less than 1/2 in (10mm).
Open
JU3
MCLKIN connects to ground
(MAX1416/MAX1415 internal-
oscillator mode only)
2-3
Problem: Unacceptable errors when measuring a
transducer.
Closed*
Open
MCLKOUT drives crystal Y1
Although most signal sources can be connected direct-
ly to the MAX1416’s analog input, some high-imped-
ance signal sources may require using the internal
input buffer (BUF = 1).
MCLKOUT is not connected
(MAX1416/MAX1415 internal-
oscillator mode only)
JU4
*Default configuration
Problem: PDA hot-sync software or other device soft-
ware interferes with EV kit software.
COM ports can only be used by one device at a time.
Disable PDA hot-sync manager.
QSPI is a trademark of Motorola, Inc.
4
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MAX1416 Evaluation Kit/
Evaluation System
Figure 1. MAX1416—Main Window of the Evaluation Software—Measurement Tab Sheet
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5
MAX1416 Evaluation Kit/
Evaluation System
Figure 2. MAX1416—Main Window of the Evaluation Software—Setup Tab Sheet
6
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MAX1416 Evaluation Kit/
Evaluation System
Figure 3. MAX1416—Main Window of the Evaluation Software—Clock Tab Sheet
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MAX1416 Evaluation Kit/
Evaluation System
Figure 4. MAX1416—Main Window of the Evaluation Software—Offset Tab Sheet
8
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MAX1416 Evaluation Kit/
Evaluation System
Figure 5. MAX1416—Main Window of the Evaluation Software—Gain Tab Sheet
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MAX1416 Evaluation Kit/
Evaluation System
Figure 6. MAX1416 —Main Window of the Evaluation Software—Comms and Data Tab Sheet
10 ______________________________________________________________________________________
MAX1416 Evaluation Kit/
Evaluation System
Figure 7. MAX1416—Saving Graphs to Disk
Figure 8. MAX1416—Saving Graphs to Disk
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MAX1416 Evaluation Kit/
Evaluation System
Figure 9. MAX1416 EV Kit Schematic
12 ______________________________________________________________________________________
MAX1416 Evaluation Kit/
Evaluation System
Figure 10. MAX1416 EV Kit Component Placement Guide—Component Side
Figure 11. MAX1416 EV Kit PC Board Layout—Component Side
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MAX1416 Evaluation Kit/
Evaluation System
Figure 12. MAX1416 EV Kit PC Board Layout —Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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