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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 standalone demo mode using a binary LED readout. It can be adapted to a user-provided 16-bit microprocessor (P) 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 P-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 +25C 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 0.1F ceramic capacitors 10F ceramic capacitors 0.01F ceramic capacitor 0.22F ceramic capacitor 1F ceramic capacitor 18-pin header Open 2-pin jumpers LEDs 10k, 5% resistors 470k, 5% resistor 620, 5% resistors 10k, 9-pin SIP resistor 100k, 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 pulses. 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 conversion. 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 rising 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, respectively, 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
tCONV
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 P 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 userprovided 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 VREF/2 0 to VREF VREF/2 VREF
_______________________________________________________________________________________
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Evaluates: MAX196/MAX198
MAX196 Evaluation Kit
Figure 2. MAX196 EV Kit Schematic
+5V C2 0.1F R2 +5V U2A 5 6 + JU12 CUTHERE REFADJ C4 0.1F C6 0.01F C5 10F REF JU2 WR DEMO CUTHERE WR EXTCLK + C3 10F H1-1 H1-14 C1 100pF H1-18 JU1 CUTHERE 10k C7 0.22F U3D 9 8 74HC04 C17 OPEN +5V R3 470k 74HC74 RDDEMO 4 3 2 1 SQ >CLK D Q R GND BYPASS CAPACITORS OPAMPV+ C9 0.1F C8 1F CH5 14 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2
+
4
13 12 CH5 HI-Z OPAMPVC10 0.1F 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 0.1F
C12 0.1F
C13 0.1F
+5V
C14 0.1F D1 D0 CH4
C15 0.1F
C16 0.1F
U2B JU3 10 S RD DEMO CUTHERE Q9 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 VDD 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, 620
+
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 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 74HC574 1 U7 OE 11 CLK< D0 2 D1 3 D2 4 D3 5 D4 6 D5 7 D6 8 D7 9 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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MAX196 Evaluation Kit Evaluates: MAX196/MAX198
Figure 4. MAX196 EV Kit PC Board Layout--Component Side
6 _______________________________________________________________________________________
MAX196 Evaluation Kit Evaluates: MAX196/MAX198
Figure 5. MAX196 EV Kit PC Board Layout--Solder Side
_______________________________________________________________________________________
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MAX196 Evaluation Kit Evaluates: MAX196/MAX198
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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