MAX9939EVKIT+ Maxim Integrated Products, MAX9939EVKIT+ Datasheet - Page 5

• Manufacturer Part Number: MAX9939EVKIT+
• Description: KIT EVAL FOR MAX9939
• Manufacturer: Maxim Integrated Products

Specifications of MAX9939EVKIT+

• Channels Per Ic: 2 - Dual
• Amplifier Type: Programmable Gain
• Output Type: Differential
• Slew Rate: 9 V/µs
• Current - Output / Channel: 70mA
• Operating Temperature: -40°C ~ 125°C
• Current - Supply (main Ic): 3.4mA
• Voltage - Supply, Single/dual (±): 2.9 V ~ 5.5 V
• Board Type: Fully Populated
• Utilized Ic / Part: MAX9939
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -

Table 1. Jumper JU1 Functions (VCC)
* Default position.
8-bit data represented by a two-digit hexadecimal
code. The code is entered in the Data bytes to be writ-
ten edit box and transmitted by pressing the Send
Now button.
The MAX9939 EV kit operates from a single supply
VCC between 2.9V to 5.5V. Using 3-pin jumper JU1,
the EV kit can be powered through the host PC’s USB
port or by an external power supply. By default, a shunt
is installed across pins 2-3 and the USB provides 5V
(+5VUSB) to power the EV kit. Install a shunt across
pins 1-2 to use an external power supply applied at the
VCC pad. Table 1 lists the selectable jumper options.
Detailed Description of Hardware
POSITION
SHUNT
2-3*
1-2
EV kit requires an external power supply
applied at the VCC pad
EV kit is powered through the host PC’s
USB port (+5VUSB)
_______________________________________________________________________________________
VCC DESCRIPTION
Power Input
MAX9939 Evaluation Kit
The MAX9939 EV kit comes standard with the
MAX9939 configured as an anti-aliasing filter to provide
a cutoff frequency to maximize the Nyquist bandwidth
of an ADC. The external resistors and capacitors are
chosen to create a 1.3kHz lowpass, 3rd-order, 0.1dB
Chebyshev multiple-feedback active filter. Refer to the
Applications Information section in the MAX9939 IC
data sheet for a more detailed description of using the
MAX9939 IC as an active filter.
The MAX9939 EV kit can also be evaluated as a differ-
ential-input, differential-output programmable gain
amplifier by configuring the output stage as follows:
1) Remove R24, R25, C20, and C21.
2) Replace R20 with a 0Ω resistor.
3) Replace R18 and R19 with 10kΩ resistors.
4) If an anti-aliasing filter is required, replace C2, C22
5) Utilize the OUT_DIFF BNC connector to analyze the
Default Configuration as an Active Filter
and R21, R22 capacitor/resistor values as required.
If an anti-aliasing filter is not required, replace R21
and R22 with 0Ω resistors while leaving C2 and C22
open.
differential output. Caution: Ensure that pin 2 of
the IN_DIFF BNC connector and pin 2 of the
OUT_DIFF BNC connector are isolated from each
other (i.e., not shorted together).
Evaluating the EV Kit as a Differential-
Input, Differential-Output PGA
5