_______________General Description

The MAX196 evaluation kit (EV kit) is an assembled and
tested board for prototyping designs using the MAX196
12-bit, multi-range data-acquisition system (DAS). The
board includes voltage buffers for all six analog input
channels, and is designed to be operated in a stand-
alone demo mode using a binary LED readout. It can
be adapted to a user-provided 16-bit microprocessor
(µP) bus. The EV kit requires a +5V power supply for
the MAX196 and ±15V power supplies for the op amps.

The MAX196 EV kit evaluates both the MAX196 and the
MAX198. To evaluate the MAX198, order a free sample
of the MAX198BCNI along with the MAX196 EV kit.

Maxim also offers a complete µP-based EV system for
the 8-bit interface version of this device, the MAX197.
Refer to the MAX197 EV kit manual.

____________________________Features

Stand-Alone Demo

Proven PC Board Layout

User Prototype Area

Fully Assembled and Tested

Jumper-Selectable Configuration

Evaluates: MAX196/MAX198

MAX196 Evaluation Kit

________________________________________________________________

Maxim Integrated Products

19-0473; Rev 0; 2/96

PART

TEMP. RANGE

BOARD TYPE

MAX196EVKIT-DIP

+25°C

Through-Hole

______________Ordering Information

________________________________________________________________________EV Kit

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

_________________________Quick Start

The MAX196 EV kit is fully assembled and tested.
Follow these steps to verify board operation.

Do not

turn on the power supply until all connections are
completed.

1) Connect a +5V supply to the pad labeled +5V, and

connect the ground return to the pad labeled GND.

2) Connect ±15V supplies to the pads labeled, respec-

tively, OPAMPV+ and OPAMPV-. Connect the power
supply's common terminal to the EV kit's GND pad.

3) Set configuration jumpers as shown in Table 1. This

selects channel 0 with a ±10V input range and puts
the device in no power-down/internal clock mode.

4) Apply an input signal to the "high-Z" channel 0 input

pad located at the far-right side of the board.

5) Turn on the power supplies.

6) Observe binary readout on the twelve LEDs.

_______________Detailed Description

Stand-Alone Demo Circuit Operation

The demo circuit is a state-machine driven by a 1kHz
system clock that generates the RD, WR, and INT puls-
es. The circuit runs continuously, writing the command
word programmed by the jumpers, and displaying the
results on the LEDs.

At power-up, R3 and C8 reset flip-flop, U2, generating a
WR pulse. On the rising edge of WR, the MAX196 latches
the command word selected by JU4JU11. The rising
edge of the system clock sets WR high, initiating a con-
version. When the MAX196 completes the conversion, the
MAX196 drives INT low. After INT falls, RD goes low at
the next rising edge of the system clock, placing the data
onto the data bus. When RD goes low, INT goes high, so
that the next system clock cycle drives RD high. RD's ris-
ing edge latches the data into U6 and U7. U8 and U9
drive the LED display. After RD returns high, WR goes
low, and the cycle repeats (Figure 1).

Evaluates: MAX196/MAX198

MAX196 Evaluation Kit

_______________________________________________________________________________________

Table 1. Default Jumper Settings

JUMPER

SETTING

JU1

Short (default trace)

JU2

Short (default trace)

JU3

Short (default trace)

JU4 (PD1)

Short

JU7 (RNG)

Open

JU5 (PD0)

Open

JU8 (BIP)

Open

JU10 (A1)

Short

JU9 (A2)

Short

JU11 (A0)

Short

JU12

Short (default trace)

____________________Component List

DESIGNATION

QTY

DESCRIPTION

100pF ceramic capacitor

C2, C4,

C9C16

0.1µF ceramic capacitors

C3, C5

10µF ceramic capacitors

0.01µF ceramic capacitor

0.22µF ceramic capacitor

18-pin header

JU1, JU2,

JU3, JU12

Open

JU4, JU6JU11

2-pin jumpers

D0D11

LEDs

SYSTEM

CLOCK

CONV

INT

Figure 1. MAX196 Stand-Alone Demo Circuit Timing Diagram

R1, R2

10k

, 5% resistors

R4R15

620

, 5% resistors

R16

10k

, 9-pin SIP resistor

R17

100k

, 9-pin SIP resistor

Maxim MAX196BCNI

74HC74 dual flip-flop

U3, U8, U9

74HC04 hex inverter

U4, U5

Maxim MXL1014CN quad
op amps

U6, U7

74HC574 octal latch

1µF ceramic capacitor

470k

, 5% resistor

Optional Input Buffers

The op amp buffers are MXL1014 precision quad op
amps, connected in voltage-follower configurations.
These op amps should normally be powered from ±15V
(±22V absolute maximum). Applications that use only
0V to 4V signals may power the MXL1014 from ±5V
with good results.

The MAX196 should be driven from a low output
impedance signal source (such as an op amp). To use
the on-board op amps, drive the HI-Z CH0CH5 input
pads. When using an off-board low-impedance source,
unplug the MXL1014s and drive the DIRECT CH0CH5
input pads.

Configuring the MAX196

Tables 2, 3, and 4 show the jumper connections for the
different operating modes of the MAX196 EV kit. Refer
to Table 2 for clock and power-down modes, Table 3
for input range selection, and Table 4 for channel
selection.

Using an External Clock

As shipped from the factory, the MAX196 EV kit uses
C1 as a timing capacitor for internal clock mode. To
use an external clock, cut JU1 and apply the external
clock source to the EXTCLK input pad. Start up the kit
with JU4 (PD1) and JU5 (PD0) shorted.

Evaluating the MAX198

To evaluate the MAX198, remove the MAX196 and
replace it with a MAX198BCNI.

Interfacing to a 16-Bit Bus

The MAX196/MAX198 are designed to connect directly
to a 16-bit µP bus using standard chip-select (CS),
read strobe (RD), and write strobe (WR) signals. JU2,
JU3, and JU12 must be cut to disable the stand-alone
circuit (Table 5). All interface signals are provided on
header H1. For interface details, refer to the
MAX196/MAX198 data sheet.

Evaluates: MAX196/MAX198

MAX196 Evaluation Kit

_______________________________________________________________________________________

Table 3. Range and Polarity Selection

Table 4. Channel Selection

Table 5. Demo Circuit Jumpers

Table 2. Clock and Power-Down
Selection

JU4

(PD1)

FUNCTION

Open

Short

No power-down, external
clock mode

Standby power-down
between readings

Short

No power-down, internal
clock mode

Open

Full power-down between
readings

JU5

(PD0)

Short

Open

JU1

Open

Short

JU8

(BIP)

MAX196

INPUT RANGE (V)

Open

Short

0 to 5

±5

Short

0 to 10

Open

±10

JU7

(RNG)

Short

Open

MAX198

INPUT RANGE (V)

0 to V

REF

±V

REF

0 to V

REF

±V

REF

JU9

(A2)

JU11

(A0)

Short

Open

Short

Open

JU10

(A1)

Open

Short

Open

CHANNEL

CH0

CH2

CH1

CH3

Open

Short

Open

Short

CH4

CH5

JU2

JU12

Short

Open

JU3

Short

Open

MODE

Stand-alone demo

Connect to a user-
provided system

Evaluates: MAX196/MAX198

MAX196 Evaluation Kit

_______________________________________________________________________________________

R4R15, 620

D11

+5V

JU4

JU12

CUTHERE

JU1

CUTHERE

100pF

0.1

0.01

0.1

C10

0.1

R17, 100k

R16

10k

D7
2

JU6

JU7

JU8

JU9

JU10

JU11

D11

D10

7 8

U9E

74HC04

U9F 74HC04

U9D 74HC04

U8F 74HC04

U8D 74HC04

U8B 74HC04

U9B 74HC04

U9C

74HC04

74HC574

U8E

74HC04

U8C

74HC04

U8A

74HC04

U9A

74HC04

D10

RD DEMO

H114

H113

H118

H115

H117

REF

H11

GND

BYPASS CAPACITORS

REFADJ

OPAMPV+

OPAMPV-

H116

H112

H111

H110

H19

H18

H17

H16

H15

H14

H13

H12

EXTCLK

+5V

CH5 HI-Z

CH4 HI-Z

CH3 HI-Z

CH2 HI-Z

CH1 HI-Z

CH0 HI-Z

HI-Z

INPUTS

DIRECT

INPUTS

CH5

CH4

CH3

CH2

CH1

CH0

D11

D10

RD DEMO

WR DEMO

CLK

D11

CLK

DGND

D10

INT

REF

REF ADJ

CH5

CH4

CH3

CH2

CH1

CH0

GND

RDDEMO

74HC74

74HC04

RD DEMO

U3F

U3E

U3D

10k

470k

+5V

10k

+5V

INT

>CLK

JU3

CUTHERE

JU2

CUTHERE

C16

0.1

C15

0.1

C14

0.1

C11

0.1

C12

0.1

C13

0.1

C17

OPEN

0.22

WR DEMO

U2B

>CLK

U2A

INT

BYPASS

CAPACITORS

+5V

MAX196

MXL1014

U4D, U4B, U4A

MXL1014

U5D, U5B, U5A

Figure 2. MAX196 EV Kit Schematic

Part Number MAX196EVKIT