19-1595; Rev 1; 12/99 MAX1292 Evaluation Kit Features ♦ 12-Bit Analog-to-Digital Conversion The board layout is designed to yield 12-bit accuracy with low noise when sampling at the maximum rate of 400ksps. The MAX1292 EV kit can also be used to evaluate the MAX1293. Request a free sample of the MAX1293BCEG when ordering the MAX1292 EV kit. ♦ Internal Clock ♦ Four Input Channels ♦ Byte-Wide Digital Interface ♦ Internal Track/Hold ♦ 400kHz Sampling Rate ♦ Internal 2.5V Reference ♦ Low-Power Standby Mode ♦ Fully Assembled and Tested Surface-Mount Board Ordering Information Component List DESIGNATION QTY PART TEMP RANGE MAX1292EVKIT 0°C to +70°C IC PACKAGE 24 QSOP DESCRIPTION C1, C3, C8–C12 7 0.1µF ceramic capacitors C2, C4, C5 3 4.7µF, 10V tantalum capacitors AVX TAJB475M010R C6, C7 2 0.01µF ceramic capacitors The MAX1292 EV kit comes fully tested and assembled. The following equipment is required: BNC connectors • A +5V linear power supply. Switching supplies induces excess noise on the power input. CH0–CH3, COM, CS, CLK, WR, 11 RD, INT, HBEN Quick Start • A low-distortion function generator J1 1 40-pin header JU1, JU2 2 2-pin jumpers R1 1 47kΩ, 9-resistor, 10-pin SIP R2, R4–R12 10 51Ω ±5% resistor U1 1 MAX1292BCEG (24-pin QSOP) None 2 Shunts None 1 MAX1292 PC board None 1 MAX1290/MAX1292 data sheet • A logic analyzer A logic analyzer or other digital system is needed to provide the clock and control signals and to capture the MAX1292 conversion results. Connect the logic analyzer using a 40-pin ribbon cable, or a combination of BNC cables, ribbon cable, and miniclips. Refer to the MAX1292 data sheet for detailed information on timing requirements. The analog input signals must be delivered by a lowdistortion source to achieve full 12-bit accuracy. All analog channels connect to BNC connectors terminated with 51Ω resistors. For low-noise performance, maintain separate analog and digital supplies and grounds to the board. The grounds are connected in a star configuration centered on the ground plane of the board. Refer to the MAX1292 data sheet for a detailed discussion of signal grounds. Many of the digital and analog signals on the evaluation kit have 51Ω termination resistors matching typical generator impedance. These should be removed if highimpedance sources are used. ________________________________________________________________ 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: MAX1292/MAX1293 General Description The MAX1292 evaluation kit (EV kit) is assembled with a MAX1292 and the basic components necessary to evaluate this 12-bit analog-to-digital converter (ADC). Connectors for power supplies, analog inputs, and digital signals simplify connections to the device. A 40-pin header allows the user to connect a logic analyzer using a ribbon cable or conventional minihooks. BNC connectors with 50Ω terminations provide easy connection between function generators and the analog inputs. Evaluates: MAX1292/MAX1293 MAX1292 Evaluation Kit Connections and Setup Connect all supplies and signal lines before turning on any supply or signal source. 1) Connect the +5V power supply to the VDD and VLOGIC pads. Connect the ground side to the AGND and DGND pads. For best low-noise performance, connect separate supplies to VDD/AGND and VLOGIC/DGND. 2) Make sure there is no shunt installed on JU1 (Table 1). This enables the internal 2.5V reference. 3) Connect the analog source (function generators or user signals) to the analog input channels (CH0–CH3). Install a shunt on JU2 to connect the COM pin to GND. 4) Connect a logic analyzer, word generator, or other source for the digital data lines D0–D7. These signals are available on the 40-pin header (Table 2). Table 1. Jumper Functions JUMPER JU1 JU2 STATE FUNCTION Open REFADJ pin open or driven externally Shorted Open Shorted REFADJ pin shorted to VDD* COM pin open or driven externally COM pin shorted to AGND *The MAX1292’s 2.5V reference must be disabled before an external reference voltage is connected. Installing a shunt across JU1 connects the REFADJ pin to VDD and disables the on-board reference. Table 2. 40-Pin Header (J1) Signals PIN NUMBER SIGNAL 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39 GND 2 D0/D8 4 D1/D9 6 D2/D10 8 D3/D11 10 D4 7) Turn on the VDD and VLOGIC supplies. Enable the digital signal source. 8) Turn on the analog sources. The system is ready for use. 9) Use the logic analyzer for data analysis. 12 D5 14 D6 Detailed Description 22 RD 24 WR 26 CLK 5) Connect the digital control signals for CS, RD, WR, and HBEN. These signals are available on the 40-pin header or on the BNC connectors. 6) Connect the clock signal (0.1MHz to 7.6MHz) to the CLK BNC connector or leave the pin open to use the internal clock. Analog Input Signals The analog inputs are configured for using a function generator. The inputs have 51Ω loads and 0.1µF capacitors to match the generator’s impedance. It might be necessary to remove these if the board is connected to the user’s system. The system must provide low impedance and any necessary anti-aliasing filtering. 16 D7 18 HBEN 20 INT 28 CS 30, 32, 34, 36, 38, 40 N.C. Grounding The MAX1292 evaluation board uses two ground planes to reduce noise. All digital signals connect to the digital ground plane (DGND), and the noise-sensitive analog signals connect to the separate analog ground plane (AGND). The two grounds connect at only one point near the ground pin (pin 20) of the MAX1292. The ground connection (RGND) for the optional external reference supply is connected directly to the same point. This “star” ground configuration is common in low-noise analog systems. 2 _______________________________________________________________________________________ J1–36 J1–38 N.C. N.C. N.C. N.C. N.C. J1–40 J1–30 J1–32 J1–34 9 J1–39 J1–37 J1–35 J1–33 J1–31 J1–29 J1–27 J1–25 J1–23 J1–21 J1– 19 J1–17 J1–15 J1–13 J1–11 J1–9 J1–7 J1–5 J1–3 J1–1 J1–2 J1–4 J1–6 J1–8 J1–10 J1–12 J1–14 J1–16 HBEN R1–H 47kΩ R1–G 47kΩ N.C. N.C. CS CLK WR RD INT J1–20 10 J1–28 J1–26 J1–24 J1–22 R1-1 47kΩ VLOGIC R7 51Ω R6 51Ω R5 51Ω R4 51Ω R1–F R1–E R1–D R1–C R1–B R1–A 47kΩ 47kΩ 47kΩ 47kΩ 47kΩ 47kΩ 8 7 6 5 4 3 2 R2 51Ω 12 11 10 9 8 7 6 5 4 3 2 1 WR RD INT D0/D8 D1/D9 D2/D10 D3/D11 D4 D5 D6 D7 HBEN CLK CS CH3 CH2 CH1 CH0 COM GND REFADJ REF VDD VLOGIC MAX1292 U1 13 14 15 16 17 18 19 20 21 22 23 24 JU2 C6 0.01µF C12 0.1µF C8 0.1µF C9 0.1µF C10 0.1µF C11 0.1µF C7 0.01µF C3 0.1µF C1 0.1µF C5 4.7µF 10V C4 4.7µF 10V C2 4.7µF 10V R12 51Ω R8 51Ω R9 51Ω R10 51Ω R11 51Ω JU1 CH3 CH2 CH1 CH0 COM RGND REFADJ REF VDD VLOGIC VLOGIC DGND AGND Evaluates: MAX1292/MAX1293 J1–18 VLOGIC MAX1292 Evaluation Kit Figure 1. MAX1292 EV Kit Schematic _______________________________________________________________________________________ 3 Evaluates: MAX1292/MAX1293 MAX1292 Evaluation Kit 1.0" Figure 2. MAX1292 EV Kit Component Placement Guide— Component Side 1.0" Figure 4. MAX1292 EV Kit PC Board Layout—Interior Layer 1 4 1.0" Figure 3. MAX1292 EV Kit PC Board Layout—Component Side 1.0" Figure 5. MAX1292 EV Kit PC Board Layout—Interior Layer 2 _______________________________________________________________________________________ MAX1292 Evaluation Kit Evaluates: MAX1292/MAX1293 1.0" Figure 6. MAX1292 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 © 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.