MAX1416EVC16 Maxim Integrated, MAX1416EVC16 Datasheet - Page 4

• Manufacturer Part Number: MAX1416EVC16
• Description: Analog to Digital Converters - ADC MAX1416 Evaluation Kit/Evaluation System
• Manufacturer: Maxim Integrated

Specifications of MAX1416EVC16

• Number Of Channels: 2
• Architecture: Sigma-Delta
• Conversion Rate: 0.5 KSPs
• Resolution: 16 bit
• Input Type: Differential
• Interface Type: QSPI, Serial (SPI, Microwire)
• Operating Supply Voltage: 4.75 V to 5.25 V
• Maximum Power Dissipation: 762 mW
• Number Of Converters: 1
• Voltage Reference: 3.5 V

The evaluation software assumes a 2.500V reference
voltage, unless otherwise specified. To override this
value, go to the Measurement tab and type the new
reference voltage next to REF voltage.
The EV kit software disk contains the driver source and
header file. Refer to DRV1416.cpp and DRV1416.h.
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.
To evaluate the MAX1415, request a free sample of the
MAX1415EUE and replace U1. Follow the Quick Start
procedure, with the following exceptions:
• In step 1, leave jumpers JU1 and JU2 open.
• In step 3, apply a +3VDC power supply (instead of
• After step 10, go to the software’s Measurement tab
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).
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 and type the new reference voltage
next to REF voltage.
MAX1416 Evaluation Kit/Evaluation System
QSPI is a trademark of Motorola, Inc.
4
+5V) to TB1. Apply an external +1.225VDC differen-
tial reference between TB3 pins 3 and 2.
and type the new reference voltage of 1.225 next to
REF voltage.
_______________________________________________________________________________________
Using an External Reference
Detailed Description
Evaluating the MAX1415
Evaluating the MX7705
Reference Voltage
Software Listing
of Hardware
Problem: No output measurement. System seems to
report zero voltage, or fails to make a measurement.
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.
Problem: Cannot see MCLK waveform on oscillo-
scope.
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.
Table 1. Jumper Functions
*Default position.
JUMPER
JU1
JU2
JU3
JU4
POSITION
Closed*
Closed*
Closed*
SHUNT
Open
Open
Open
Open
1-2*
2-3
U2 (MAX873) supplies REF+
reference voltage
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
MCLKIN connects to ground
(MAX1416/MAX1415 internal-
oscillator mode only)
MCLKOUT drives crystal Y1
MCLKOUT is not connected
(MAX1416/MAX1415 internal-
oscillator mode only)
FUNCTION
Troubleshooting