MAX1403EVKIT Maxim Integrated Products, MAX1403EVKIT Datasheet - Page 5

• Manufacturer Part Number: MAX1403EVKIT
• Description: EVAL KIT FOR MAX1403
• Manufacturer: Maxim Integrated Products

Specifications of MAX1403EVKIT

• Number Of Adc's: 1
• Number Of Bits: 18
• Sampling Rate (per Second): 480
• Data Interface: Serial
• Inputs Per Adc: 6 Single Ended
• Input Range: ±VREF/gain
• Power (typ) @ Conditions: 16.9mW @ 480SPS
• Voltage Supply Source: Analog and Digital
• Operating Temperature: 0°C ~ 70°C
• Utilized Ic / Part: MAX1403
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

cessing gain, reducing the full-scale voltage range by a
factor of 1, 2, 4, 8, 16, 32, 64, or 128. Finally, the offset-
correction DAC offsets the voltage range by up to ±7/6
of the full-scale voltage range.
Input pins AIN1 and AIN2 are controlled by TF1. Input
pins AIN3 and AIN4 are controlled by TF2. Input pin
AIN5 is controlled by TF3. Input pin AIN6 is the analog
common.
When SCAN = 1, the CALOFF and CALGAIN channels
are controlled by TF3. When SCAN = 0, the CALOFF
and CALGAIN channels are controlled by one of the
transfer function registers, as selected by the A1 and
A0 bits.
For simplicity, the EV kit software assumes that all three
transfer functions are configured alike.
U1, the MAX1403, is a multichannel, high-resolution
A/D converter (refer to the MAX1403 data sheet). U2,
the MAX6520, is a 1.2V reference (refer to the
MAX6520 data sheet). Y1 contains a ceramic resonator
and its load capacitors. R1–R6, together with C3–C8,
form anti-aliasing input filters. R8 and C11 filter the digi-
tal power supply. The analog supply comes through fil-
ter R7/C10.
The EV kit has an RC filter on each input with a time
constant of approximately 0.01µs = 10ns (R = 100Ω,
________________________of Hardware
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Detailed Description
Input Filtering
C = 100pF). When scanning between channels, the RC
filter’s settling time may increase the acquisition time
required for full accuracy.
The MAX1401 can be evaluated by shorting across
jumpers JU6 and JU7. The MAX1401 is exactly like the
MAX1403, except that the function of pins 5, 6, 7, and 8
is changed. Instead of the OUT1/OUT2 outputs and
DS0/DS1 inputs, these pins are used to provide access
to the analog signal between the multiplexer and the
A/D converter. Tables 2 and 3 list the jumper functions
and default settings. Refer to the MAX1401 data sheet
for detailed information.
Supply current can be estimated by measuring the volt-
age across a series resistor. On the EV kit board, the
MAX1403 draws all of its analog and digital power
through R8, which is 10Ω. In addition, all analog supply
current flows through R7, which is also 10Ω.
Problem: unacceptable amounts of noise in the signal.
Collect a sample of 1024 measurements at a 60Hz data
rate. Observe whether the problem is caused by 60Hz
noise.
Any AC-powered equipment connected to the analog
signal ground can inject noise. Try replacing AC-pow-
ered DVMs with battery-powered DVMs.
MAX1403 EV System
Measuring Supply Current
Evaluating the MAX1401
Troubleshooting
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