19-0473; Rev 0; 2/96 MAX196 Evaluation Kit 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 (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 ______________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 Evaluates: MAX196/MAX198 _______________General Description Evaluates: MAX196/MAX198 MAX196 Evaluation Kit ____________________Component List DESIGNATION C1 QTY 1 Table 1. Default Jumper Settings DESCRIPTION 100pF ceramic capacitor JUMPER SETTING JU1 Short (default trace) JU2 Short (default trace) JU3 Short (default trace) C2, C4, C9–C16 10 C3, C5 C6 C7 C8 H1 2 1 1 1 1 10µF ceramic capacitors 0.01µF ceramic capacitor 0.22µF ceramic capacitor 1µF ceramic capacitor 18-pin header JU1, JU2, JU3, JU12 0 Open JU11 (A0) Short JU12 Short (default trace) 0.1µF ceramic capacitors JU4, JU6–JU11 D0–D11 R1, R2 R3 R4–R15 R16 R17 U1 U2 U3, U8, U9 7 12 2 1 12 1 1 1 1 3 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 U4, U5 2 Maxim MXL1014CN quad op amps U6, U7 2 74HC574 octal latch _________________________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. JU4 (PD1) Short JU5 (PD0) Open JU7 (RNG) Open JU8 (BIP) Open JU9 (A2) Short JU10 (A1) Short _______________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). SYSTEM CLOCK WR tCONV INT RD Figure 1. MAX196 Stand-Alone Demo Circuit Timing Diagram 2 _______________________________________________________________________________________ MAX196 Evaluation Kit 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. JU10 (A1) JU11 (A0) CHANNEL Short Short Short Short CH0 Short Open CH1 Short Open Short CH2 Short Open Open CH3 Open Short Short CH4 Open Short Open 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. Evaluating the MAX198 Interfacing to a 16-Bit Bus JU4 (PD1) JU5 (PD0) JU1 Short Short Open No power-down, external clock mode Short Open Short No power-down, internal clock mode Open Short X Standby power-down between readings Open Open X Full power-down between readings FUNCTION Table 3. Range and Polarity Selection JU7 (RNG) JU9 (A2) To evaluate the MAX198, remove the MAX196 and replace it with a MAX198BCNI. Table 2. Clock and Power-Down Selection JU8 (BIP) Table 4. Channel Selection MAX196 MAX198 INPUT RANGE (V) INPUT RANGE (V) Short Short 0 to 5 0 to VREF/2 Short Open 0 to 10 0 to VREF Open Short ±5 ±VREF/2 Open Open ±10 ±VREF 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 JU12 MODE Short Short Short Stand-alone demo Open Open Open Connect to a userprovided system _______________________________________________________________________________________ 3 Evaluates: MAX196/MAX198 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. 4 U3F 12 +5V D7 D5 D3 D1 D8 D10 C14 0.1µF +5V C11 0.1µF C15 0.1µF C12 0.1µF 11 U3E 10 D6 D4 D2 D0 D9 4 U9B 74HC04 4 U8B 74HC04 8 U8D 74HC04 12 U8F 74HC04 8 U9D 74HC04 12 U9F 74HC04 INT C17 OPEN 74HC04 R4–R15, 620Ω C16 0.1µF C13 0.1µF 74HC04 10k C7 0.22µF U3D 9 8 10k D11 74HC04 BYPASS CAPACITORS +5V 13 R2 R1 2 3 2 3 6 9 10 13 6 9 10 13 +5V 5 U8C 74HC04 11 U8E 74HC04 5 U9C 74HC04 1 U9A 74HC04 1 U8A 74HC04 74HC74 S Q >CLK D Q R U2A 6 5 WR JU12 CUTHERE JU2 WR DEMO CUTHERE 74HC74 19 18 17 16 15 14 13 12 19 18 17 16 15 14 13 12 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 74HC574 1 11 2 3 4 5 6 7 8 9 1 U7 OE 11 CLK< D0 2 D1 3 D2 4 D3 5 D4 6 D5 7 D6 8 D7 9 U6 OE CLK< Q0 D0 Q1 D1 Q2 D2 Q3 D3 Q4 D4 Q5 D5 Q6 D6 Q7 D7 74HC574 D0 D1 D2 D3 D4 D5 D6 D7 D11 D10 D9 D8 EXTCLK RD DEMO +5V +5V +5V +5V +5V +5V +5V +5V H1–13 H1–12 H1–11 H1–10 H1–9 H1–8 H1–7 H1–6 H1–5 H1–4 H1–3 H1–2 RD DEMO U2B JU3 10 S RD DEMO CUTHERE Q 9 11 >CLK RD 12 D 8 13 Q R 11 U9E 74HC04 C8 1µF R3 470k +5V RDDEMO 4 3 2 1 +5V H1–14 D1 D0 JU1 CUTHERE H1–18 + C3 10µF +5V 9 D0 JU11 8 D1 JU10 7 D2 JU9 6 D3 JU8 5 D4 JU7 4 D5 3 D6 JU6 2 D7 JU4 R16 10k WR DEMO 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 R17, 100k D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 C1 100pF C2 0.1µF DIRECT INPUTS CH0 CH1 CH2 CH3 CH4 CH5 C4 0.1µF + REF + 13 12 + 13 12 1 + 2 3 U5D, U5B, U5A MXL1014 6 7 + 5 14 U4D, U4B, U4A 2 1 + 3 HI-Z INPUTS CH0 HI-Z CH1 HI-Z CH2 HI-Z CH3 HI-Z CH4 HI-Z CH5 HI-Z REFADJ C6 0.01µF MXL1014 6 7 + 5 14 C5 10µF H1–1 OPAMPVC10 0.1µF OPAMPV+ C9 0.1µF BYPASS CAPACITORS GND Evaluates: MAX196/MAX198 MAX196 Evaluation Kit Figure 2. MAX196 EV Kit Schematic _______________________________________________________________________________________ MAX196 Evaluation Kit Evaluates: MAX196/MAX198 Figure 3. MAX196 EV Kit Component Placement Guide—Component Side _______________________________________________________________________________________ 5 Evaluates: MAX196/MAX198 MAX196 Evaluation Kit 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 _______________________________________________________________________________________ 7 Evaluates: MAX196/MAX198 MAX196 Evaluation Kit 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 © 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.