19-2558; Rev 0; 6/02 MAX1165 Evaluation Kit The MAX1165 evaluation kit (EV kit) is an assembled and tested circuit board that demonstrates the MAX1165 analog-to-digital converter. The EV kit can also evaluate the MAX1065/MAX1066 and MAX1165/ MAX1166. Request free samples of the desired parts when ordering the MAX1165 EV kit. Features ♦ Proven PC Board Layout ♦ Convenient On-Board Test Points ♦ Fully Assembled and Tested Ordering Information PART MAX1165EVKIT QTY DESCRIPTION C1, C2, C11, C12 4 10µF, 10V X7R ceramic capacitors Taiyo Yuden LMK325BJ106MN C3, C4, C5, C8, C9, C10 6 0.1µF, 10V X7R ceramic capacitors C6 1 4.7µF, 10V X7R ceramic capacitor Taiyo Yuden JMK212BJ475KG C7 1 0.01µF ceramic capacitor C7, R2 4 Socket-pin receptacles H1 1 2 × 16 dual-row vertical header JU1–JU6 6 2-pin headers R1 1 100kΩ ±5% resistor R2 1 4.7Ω ±5% resistor U1 1 MAX1165BEUI U2 1 Hex Schmitt trigger buffer 74HC14 U3 1 MAX4430ESA None 1 MAX1165 EV kit PC board None 1 MAX1165 data sheet None 1 MAX1165 EV kit data sheet Component Supplier SUPPLIER Taiyo Yuden PHONE FAX 800-348-2496 847-925-0899 WEBSITE www.t-yuden.com Note: Please indicate that you are using the MAX1165 when contacting these component suppliers. 0°C to +70°C IC PACKAGE 28 TSSOP Quick Start Component List DESIGNATION TEMP RANGE Recommended Equipment • • • • • MAX1165 EV kit Two DC power supplies, 5V at 10mA Programmable signal generator, such as Tektronix DG2020A Logic analyzer (optional) Reconstruction DAC (optional) Procedure The MAX1165 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) Ensure that JU1, JU2, and JU3 are open (see Table 1). 2) With the power off, connect the first 5VDC power supply between AVDD and AGND. 3) With the power off, connect the second 5VDC power supply between DVDD and DGND. Note: DGND and AGND are connected on the MAX1165 EV kit board. To avoid ground loops, do not connect AGND to DGND at any other location. 4) Configure the pattern generator to produce the appropriate read/convert (R/C) and conversion start (CS) waveforms. Refer to Figure 2 in the MAX1165 data sheet. 5) Connect the pattern generator CS output across jumper JU4. 6) Connect the pattern generator R/C output across jumper JU5. 7) Connect logic analyzer or other digital data capture system to header H1. The least significant bit, D0, appears on H1 pin 1, and the end-of-conversion output strobe (EOC) appears across jumper JU6 (see Table 2). 8) Turn on the power supplies and enable the pattern generator. 9) Apply 0 to 4.096V analog input signal between pads AIN and AGND. Capture digital data from header H1. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 Evaluates: MAX1165/MAX1166/MAX1065/MAX1066 General Description Evaluates: MAX1165/MAX1166/MAX1065/MAX1066 MAX1165 Evaluation Kit Detailed Description of Hardware The MAX1165 (U1) is a single-channel, 16-bit dataacquisition system. Anti-alias filtering is performed by R2 and C7. The input signal can be applied directly to the AIN pad, or an optional MAX4430 precision buffer (U3) can be used instead. Capacitors C4 and C6 bypass the reference. Schmitt trigger (U2) ensures proper system timing by keeping the CS rising and falling edges clean. Analog Input Buffer When powered from ±5V supplies, the analog input buffer (U3) has an input common-mode range of -2.5V to +4.1V. 1) With the power off, connect the +5VDC power supply between BUF+5 and AGND. Evaluating the MAX1165/MAX1166 and MAX1065/MAX1066 The MAX1166 has an 8-bit interface. Its high-byte enable (HBEN) is on the pad labeled RESET. To evaluate the MAX1166, request a free sample of the MAX1166BEUP. Remove the MAX1165 and install the MAX1166, leaving U1 pins 1–4 and 25–28 unconnected. The MAX1065 is a 14-bit version of the MAX1165. To evaluate the MAX1065, request a free sample of the MAX1065AEUI. Remove the MAX1165 and install the MAX1065. The MAX1066 is a 14-bit version of the MAX1165, with an 8-bit interface. Its high-byte enable (HBEN) is on the pad labeled RESET. To evaluate the MAX1066, request a free sample of the MAX1066AEUP. Remove the MAX1165 and install the MAX1066, leaving U1 pins 1–4 and 25–28 unconnected. 2) With the power off, connect the -5VDC power supply between BUF-5 and AGND. See Table 2 for device comparison. 3) With the power off, connect the DC power supply ground return to AGND. Problem: no output measurement. System seems to report zero voltage, or fails to make a measurement. 4) Install a shunt across jumper JU3. Check AVDD and DVDD supply voltages. Check the 4.096V reference voltage using a digital voltmeter. Use an oscilloscope to verify the R/C, CS, and EOC signals. Ensure that a resistor is installed in socket R2; otherwise, the analog input is unconnected. 5) Apply analog input signal to BUFIN pad. If the full unipolar 0 to 5V range is needed, apply +7V to BUF+5 and -3V to BUF-5. The input common-mode range is -0.5V to +6.1V. Generating a Crossplot To see a visual indication of relative LSB size and DNL performance, create a crossplot fixture using a function generator, a latch, a resistor network, and an oscilloscope. Latch the data on the falling edge of EOC. Connect the least significant bits together, using resistors of varying weights (for example, D0 = 75.0kΩ ±1%, D1 = 39.1kΩ ±1%, D2 = 20.0kΩ ±1%, D3 = 10.0kΩ ±1%, D4 = 4.99kΩ ±1%). Drive the analog inputs with a linear ramping signal, such as a 100Hz triangle wave. Connect an oscilloscope in X-Y mode with X = analog input and Y = weighted sum of the latched digital outputs. The resulting staircase plot gives a visual indication of relative LSB sizes and DNL performance. 2 Troubleshooting If using the input buffer U3, ensure that the ±5V power supply is connected and JU3 is closed. Problem: measurements are erratic, unstable; poor accuracy. Check the reference voltage using a digital voltmeter. Use an oscilloscope to check for noise. When probing for noise, keep the oscilloscope ground return lead as short as possible, preferably less than 1/2in (10mm). Increase C6 and C7 capacitance. Short JU1 and apply an external 4.096V reference at REF to improve accuracy. Check for ground loops in your system. _______________________________________________________________________________________ MAX1165 Evaluation Kit JUMPER FUNCTION JU1 Leave JU1 open to enable the internal reference. Short JU1 when applying an external reference at REF. JU2 Momentarily short JU2 to reset U1 (MAX1165/MAX1065 only). Leave JU2 open and apply high-byte enable signal (HBEN) at the RESET pad (MAX1166/MAX1066 only). JU3 Short JU3 to drive analog input from MAX4430 buffer U3. Leave JU3 open when driving AIN directly through R2. JU4 Apply conversion start signal (CS) across JU4 JU5 Apply read/convert signal (R/C) across JU5 JU6 Obtain end-of-conversion (EOC) signal from JU6 Table 2. Device Comparison PART MAX1165 MAX1166 MAX1065 MAX1066 RESOLUTION 16 bit 16 bit 14 bit 14 bit INTERFACE WIDTH 16 bit 8 bit 16 bit 8 bit H1-1 signal D0 D0/D8 Not used D0/D8 H1-3 signal D1 D1/D9 Not used D1/D9 H1-5 signal D2 D2/D10 D0 D2/D10 H1-7 signal D3 D3/D11 D1 D3/D11 H1-9 signal D4 Not used D2 Not used H1-11 signal D5 Not used D3 Not used H1-13 signal D6 Not used D4 Not used H1-15 signal D7 Not used D5 Not used H1-17 signal D8 Not used D6 Not used H1-19 signal D9 Not used D7 Not used H1-21 signal D10 Not used D8 Not used H1-23 signal D11 Not used D9 Not used H1-25 signal D12 D4/D12 D10 D4/D12 H1-27 signal D13 D5/D13 D11 D5/D13 H1-29 signal D14 D6/D14 D12 D6/0 H1-31 signal D15 D7/D15 D13 D7/0 RESET pad RESET HBEN RESET HBEN _______________________________________________________________________________________ 3 Evaluates: MAX1165/MAX1166/MAX1065/MAX1066 Table 1. Jumper Functions Evaluates: MAX1165/MAX1166/MAX1065/MAX1066 MAX1165 Evaluation Kit BUF +5 HEADER 32-PIN C11 10µF 10V H1-17 C9 0.1µF H1-19 H1-21 H1-23 2 7 U3 6 H1-25 3 MAX4430 BUFIN 4 C8 0.1µF H1-27 H1-29 H1-31 C12 10µF 10V 1 2 3 4 5 6 7 8 D7 D8 D6 D9 D5 D10 D11 D4 D12 D3 D13 D2 D14 D1 D0 D15 (MSB) 27 26 25 24 23 22 21 H1-15 H1-18 H1-16 H1-13 H1-20 H1-14 H1-11 H1-22 H1-12 H1-9 H1-24 H1-10 H1-7 H1-26 H1-8 H1-5 H1-28 H1-6 H1-3 H1-30 H1-4 H1-1 H1-32 H1-2 U1 JU5 9 R/C DVDD MAX1165 DVDD JU3 28 20 DVDD JU6 10 EOC AVDD 11 C1 10µF 10V DGND CS AVDD AGND REF 2 1 4 3 13 AIN 17 RESET 16 REF R1 100kΩ JU2 DVDD AIN C7 0.01µF AVDD 14 JU4 U2-B 74HC14 C6 4.7µF R2 4.7Ω AGND 18 DGND U2-A 74HC14 RESET 12 19 AVDD C3 0.1µF AGND C2 10µF 10V C5 0.1µF BUF-5 AGND REFCAP DVDD JU1 15 C4 0.1µF Figure 1. MAX1165 EV Kit Schematic 4 _______________________________________________________________________________________ C10 0.1µF MAX1165 Evaluation Kit Figure 3. MAX1165 EV Kit PC Board Layout—Component Side Figure 4. MAX1165 EV Kit PC Board Layout—Solder Side 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 5 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. Evaluates: MAX1165/MAX1166/MAX1065/MAX1066 Figure 2. MAX1165 EV Kit Component Placement Guide— Component Side