MAX152 EV Kit
___________________Quick Reference
The evaluation kit as shipped, is configured for the continuous-
conversion mode. To verify operation, follow these steps:
1. Verify that the jumpers are configured as
described in Table 2.
2. Connect the power supplies (+3V for MAX152,
+5V for MAX153) to the power input connector.
3. Connect an analog input to AIN input.
4. Read conversion results displayed on the LEDs.
_______________General Description
Jumper Functions
The MAX152 EV kit has several jumpers to alter the
configuration. Table 1 lists the jumpers and their func-
tions. Table 2 gives the jumper selection for a free-run-
ning mode used for board verification.
Note that Table 2's configuration drives both the
RD
and
CS
inputs and sets the MODE pin low. The timing dia-
gram for this configuration is shown in the MAX152 or
MAX153 data sheet. Refer to the data sheet for more
information on the various operating modes.
Power Requirements
The MAX152 EV kit may be used with either the
MAX152 or MAX153. The MAX152 will operate on sup-
plies as low as 2.7V. The MAX153 operates on +5V or
±5V. The positive supply is also connected to the octal
latch and ICM7555 timer on the board. The LEDs will
cause the positive supply current to approach 60mA
when all are on. The V
SS
input is connected only to the
MAX152/MAX153's V
SS
pin. The V
SS
pin will draw less
than 50µA. Optionally, J4 can be shorted to connect
V
SS
to ground when not using a negative supply.
MAX152/MAX153 Reference Voltage
The VREF+ and VREF- pins may be connected to any
potential between V
DD
and V
SS
. For single-supply
operation, VREF+ can be connected to V
DD
and VREF-
can be connected to ground. Jumpers (J1 and J2) are
provided for this configuration. If a reference voltage
other than V
DD
or ground is desired, connect the
source to the VREF+ and/or VREF- pads and set J1 and
J2 accordingly. Refer to Table 1 for their use.
MAX152/MAX153 Data Output/Display
The MAX152/MAX153's output is latched and buffered
by a 74HCT574 so it can drive an LED display. The
MAX152 Evaluation Kit
14 ______________________________________________________________________________________
Table 2. Jumper Selection for Free-Running Mode
JUMPER CONNECTION FUNCTION
J1 2 & 3 VREF- connected to GND
J2 Short VREF+ connected to V
DD
J3 2 & 3
CS
driven by ICM7555
J4 Short
V
SS
connected to GND. Leave
J4 open if a V
SS
source is used.
J5 Open MODE pin internally pulled low
J6 Short Enable the ICM7555
J7 Short Enable the LED display
J8 Short
RD
driven by ICM7555
Table 1. Jumper Functions
JUMPER CONNECTION FUNCTION
MODE pin connected to V
DD
1 & 2 VREF- connected to the drain
of Q1
J2
Short VREF+ shorted to V
DD
J3
Open
Used when an external digital
signal is applied to the
CS
input
J4
Short V
SS
connected to ground
J5
Open
MODE pin open (internally pulled
low)
J6
Open ICM7555 circuit disabled
J7
Open LED display disabled
J8
Open
Used when an external digital
input is applied to the
RD
input
J1
Open Used when connecting a voltage
source to the VREF- pad
Short
2 & 3 VREF- connected to ground
ICM7555 circuit enabled
Open
Used when connecting a voltage
source to the VREF+ pad
Short
1 & 2
CS
grounded
Short
2 & 3
CS
driven by the ICM7555
LED display enabled
Open
Used when driving V
SS
with a
negative source (-5V or -3V)
Short
RD
driven by the ICM7555
