Evaluates: MAX1292/MAX1293
MAX1292 Evaluation Kit
2 _______________________________________________________________________________________
Connections and Setup
Connect all supplies and signal lines before turning on
any supply or signal source.
1) Connect the +5V power supply to the VDD and
VLOGIC pads. Connect the ground side to the
AGND and DGND pads. For best low-noise perfor-
mance, connect separate supplies to VDD/AGND
and VLOGIC/DGND.
2) Make sure there is no shunt installed on JU1
(Table 1). This enables the internal 2.5V reference.
3) Connect the analog source (function generators or
user signals) to the analog input channels
(CH0–CH3). Install a shunt on JU2 to connect the
COM pin to GND.
4) Connect a logic analyzer, word generator, or other
source for the digital data lines D0–D7. These signals
are available on the 40-pin header (Table 2).
5) Connect the digital control signals for CS, RD, WR,
and HBEN. These signals are available on the 40-pin
header or on the BNC connectors.
6) Connect the clock signal (0.1MHz to 7.6MHz) to the
CLK BNC connector or leave the pin open to use
the internal clock.
7) Turn on the VDD and VLOGIC supplies. Enable the
digital signal source.
8) Turn on the analog sources. The system is ready
for use.
9) Use the logic analyzer for data analysis.
Detailed Description
Analog Input Signals
The analog inputs are configured for using a function
generator. The inputs have 51Ω loads and 0.1µF capaci-
tors to match the generator’s impedance. It might be
necessary to remove these if the board is connected to
the user’s system. The system must provide low imped-
ance and any necessary anti-aliasing filtering.
Grounding
The MAX1292 evaluation board uses two ground planes
to reduce noise. All digital signals connect to the digital
ground plane (DGND), and the noise-sensitive analog
signals connect to the separate analog ground plane
(AGND). The two grounds connect at only one point
near the ground pin (pin 20) of the MAX1292. The
ground connection (RGND) for the optional external ref-
erence supply is connected directly to the same point.
This “star” ground configuration is common in low-noise
analog systems.
Table 1. Jumper Functions
Table 2. 40-Pin Header (J1) Signals
JUMPER STATE FUNCTION
JU1
Open REFADJ pin open or driven externally
Shorted
REFADJ pin shorted to V
DD
*
JU2
Open
COM pin open or driven externally
Shorted
COM pin shorted to AGND
*The MAX1292’s 2.5V reference must be disabled before an
external reference voltage is connected. Installing a shunt
across JU1 connects the REFADJ pin to V
DD
and disables the
on-board reference.
14
PIN NUMBER SIGNAL
D6
2 D0/D8
16
4 D1/D9
D7
6 D2/D10
18
8 D3/D11
HBEN
10 D4
20
12 D5
INT
22
RD
24
WR
26 CLK
1, 3, 5, 7, 9, 11, 13, 15,
17, 19, 21, 23, 25, 27, 29,
31, 33, 35, 37, 39
GND
28
CS
30, 32, 34, 36, 38, 40 N.C.
