19-0473; Rev 0; 2/96
MAX196 Evaluation Kit
_______________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
o
Stand-Alone Demo
o
Proven PC Board Layout
o
User Prototype Area
o
Fully Assembled and Tested
o
Jumper-Selectable Configuration
Evaluates: MAX196/MAX198
______________Ordering Information
PART
MAX196EVKIT-DIP
TEMP. RANGE
+25°C
BOARD TYPE
Through-Hole
________________________________________________________________________EV Kit
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
MAX196 Evaluation Kit
Evaluates: MAX196/MAX198
____________________Component List
DESIGNATION
C1
C2, C4,
C9–C16
C3, C5
C6
C7
C8
H1
JU1, JU2,
JU3, JU12
JU4, JU6–JU11
D0–D11
R1, R2
R3
R4–R15
R16
R17
U1
U2
U3, U8, U9
U4, U5
U6, U7
QTY
1
10
2
1
1
1
1
0
7
12
2
1
12
1
1
1
1
3
2
2
DESCRIPTION
100pF ceramic capacitor
0.1µF ceramic capacitors
10µF ceramic capacitors
0.01µF ceramic capacitor
0.22µF ceramic capacitor
1µF ceramic capacitor
18-pin header
Open
2-pin jumpers
LEDs
10kΩ, 5% resistors
470kΩ, 5% resistor
620Ω, 5% resistors
10kΩ, 9-pin SIP resistor
100kΩ, 9-pin SIP resistor
Maxim MAX196BCNI
74HC74 dual flip-flop
74HC04 hex inverter
Maxim MXL1014CN quad
op amps
74HC574 octal latch
Table 1. Default Jumper Settings
JUMPER
JU1
JU2
JU3
JU4 (PD1)
JU5 (PD0)
JU7 (RNG)
JU8 (BIP)
JU9 (A2)
JU10 (A1)
JU11 (A0)
JU12
SETTING
Short (default trace)
Short (default trace)
Short (default trace)
Short
Open
Open
Open
Short
Short
Short
Short (default trace)
_______________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 JU4–JU11. 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).
_________________________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.
SYSTEM
CLOCK
WR
INT
t
CONV
RD
Figure 1. MAX196 Stand-Alone Demo Circuit Timing Diagram
2
_______________________________________________________________________________________
MAX196 Evaluation Kit
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 CH0–CH5 input
pads. When using an off-board low-impedance source,
unplug the MXL1014s and drive the DIRECT CH0–CH5
input pads.
Evaluates: MAX196/MAX198
Table 4. Channel Selection
JU9
(A2)
Short
Short
Short
Short
Open
Open
JU10
(A1)
Short
Short
Open
Open
Short
Short
JU11
(A0)
Short
Open
Short
Open
Short
Open
CHANNEL
CH0
CH1
CH2
CH3
CH4
CH5
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.
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.
Evaluating the MAX198
To evaluate the MAX198, remove the MAX196 and
replace it with a MAX198BCNI.
Table 2. Clock and Power-Down
Selection
JU4
(PD1)
Short
Short
Open
Open
JU5
(PD0)
Short
Open
Short
Open
JU1
Open
Short
X
X
FUNCTION
No power-down, external
clock mode
No power-down, internal
clock mode
Standby power-down
between readings
Full power-down between
readings
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.
Table 5. Demo Circuit Jumpers
JU2
JU3
Short
Open
JU12
Short
Open
MODE
Stand-alone demo
Connect to a user-
provided system
Short
Open
Table 3. Range and Polarity Selection
JU8
(BIP)
Short
Short
Open
Open
JU7
(RNG)
Short
Open
Short
Open
MAX196
MAX198
INPUT RANGE (V) INPUT RANGE (V)
0 to 5
0 to 10
±5
±10
0 to V
REF
/2
0 to V
REF
±V
REF
/2
±V
REF
_______________________________________________________________________________________
3
Evaluates: MAX196/MAX198
MAX196 Evaluation Kit
Figure 2. MAX196 EV Kit Schematic
+5V
C2
0.1µF
R2
+5V
U2A
REF
+
C5
10µF
REFADJ
C4
0.1µF
C6
0.01µF
JU2
CUTHERE
5 WR DEMO
6
JU12
CUTHERE
WR
EXTCLK
+
C3
10µF
H1–1
H1–14
C1
100pF
H1–18
JU1
CUTHERE
10k
C7
0.22µF
U3D
9
8
74HC04
C17
OPEN
+5V
R3
470k
74HC74
RDDEMO
4
3
2
1
S Q
>CLK
D
Q
R
GND
BYPASS CAPACITORS
OPAMPV+
C9
0.1µF
C8
1µF
CH5
14
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
-
+
4
13
12
CH5 HI-Z
OPAMPV-
C10
0.1µF
INT
+5V
74HC74
CH3
R17, 100k
RD DEMO
+5V
+5V
+5V
+5V
+5V
+5V
RD DEMO
+5V
+5V
6 D3 JU8
7 D2 JU9
8 D1 JU10
9 D0
JU11
DIRECT
INPUTS
HI-Z
INPUTS
5 D4 JU7
CH0
1
-
+
R1
10k
U3F
U3E
13
12
11
10
74HC04
BYPASS
CAPACITORS +5V
74HC04
C11
0.1µF
C12
0.1µF
C13
0.1µF
+5V
C14
0.1µF
D1
D0
CH4
C15
0.1µF
C16
0.1µF
U2B
JU3
10
S
9 RD DEMO CUTHERE
Q
11
>CLK
RD
12
D
8
13
Q
R
H1–13
H1–12
H1–11
H1–10
H1–9
H1–8
H1–7
H1–6
H1–5
H1–4
H1–3
H1–2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
CLK
DGND
V
DD
27
CS
WR
D11
WR 26
H1–15
25 RD H1–16
U1
D10
RD
24 INT
H1–17
D9
INT
MAX196
23
D8
REF
22
D7
REF ADJ
21
D6
CH5
20
D5
CH4
19
D4
CH3
18
D3
CH2
17
D2
CH1
16
D1
CH0
15
D0
GND
MXL1014
6
7
-
+
5
U4D, U4B, U4A
2
-
1
+
3
CH2
CH4 HI-Z
2 D7 JU4
3 D6 JU6
WR DEMO
4 D5
R16
10k
CH1
CH3 HI-Z
+5V
13
10
9
6
13
10
9
6
3
2
3
2
1
U9A
74HC04
1
U8A
74HC04
5
U8C
74HC04
11
U8E
74HC04
11
U9E
74HC04
D11
D10
D9
D8
14
D11
12
U9F
74HC04
R4–R15, 620Ω
-
+
13
12
CH2 HI-Z
D10
D9
8
U9D
74HC04
5
U9C
74HC04
12
U8F
74HC04
MXL1014
6
7
-
+
5
U5D, U5B, U5A
2
3
CH1 HI-Z
D8
D0
19
18
17
16
15
14
13
12
1
11
2
3
4
5
6
7
8
9
U6
OE
CLK<
Q0
D0
Q1
D1
Q2
D2
Q3
D3
Q4
D4
Q5
D5
Q6
D6
Q7
D7
74HC574
CH0 HI-Z
D1
D2
8
U8D
74HC04
4
U8B
74HC04
D3
D4
D5
D6
4
U9B
74HC04
_______________________________________________________________________________________
19
18
17
16
15
14
13
12
1
U7
OE 11
CLK<
Q0
D0 2
Q1
D1 3
Q2
D2 4
Q3
D3 5
Q4
D4 6
Q5
D5 7
Q6
D6 8
Q7
D7 9
74HC574
D0
D1
D2
D3
D4
D5
D6
D7
D7
MAX196 Evaluation Kit
Evaluates: MAX196/MAX198
Figure 3. MAX196 EV Kit Component Placement Guide—Component Side
_______________________________________________________________________________________
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