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19-1595; Rev 1; 12/99
MAX1292 Evaluation Kit
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 50 terminations provide easy connection between function generators and the analog inputs. 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. o 12-Bit Analog-to-Digital Conversion o Four Input Channels o Byte-Wide Digital Interface o Internal Track/Hold o 400kHz Sampling Rate o Internal 2.5V Reference o Internal Clock o Low-Power Standby Mode o Fully Assembled and Tested Surface-Mount Board
Features
Evaluates: MAX1292/MAX1293
Ordering Information Component List
DESIGNATION QTY C1, C3, C8-C12 C2, C4, C5 C6, C7 7 3 2 DESCRIPTION 0.1F ceramic capacitors 4.7F, 10V tantalum capacitors AVX TAJB475M010R 0.01F ceramic capacitors BNC connectors 40-pin header 2-pin jumpers 47k, 9-resistor, 10-pin SIP 51 5% resistor MAX1292BCEG (24-pin QSOP) Shunts MAX1292 PC board MAX1290/MAX1292 data sheet PART MAX1292EVKIT TEMP RANGE 0C to +70C IC PACKAGE 24 QSOP
Quick Start
The MAX1292 EV kit comes fully tested and assembled. The following equipment is required: * A +5V linear power supply. Switching supplies induces excess noise on the power input. * A low-distortion function generator * 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 51 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 51 termination resistors matching typical generator impedance. These should be removed if highimpedance sources are used.
CH0-CH3, COM, CS, CLK, WR, 11 RD, INT, HBEN J1 JU1, JU2 R1 R2, R4-R12 U1 None None None 1 2 1 10 1 2 1 1
________________________________________________________________ Maxim Integrated Products
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MAX1292 Evaluation Kit Evaluates: MAX1292/MAX1293
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). 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. 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.
Table 1. Jumper Functions
JUMPER JU1 JU2 STATE Open Shorted Open Shorted FUNCTION REFADJ pin open or driven externally 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 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30, 32, 34, 36, 38, 40 SIGNAL GND D0/D8 D1/D9 D2/D10 D3/D11 D4 D5 D6 D7 HBEN INT RD WR CLK CS N.C.
Detailed Description
Analog Input Signals
The analog inputs are configured for using a function generator. The inputs have 51 loads and 0.1F 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.
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 _______________________________________________________________________________________
AGND VLOGIC R1-G 47k U1 DGND VLOGIC 24 23 22 VDD 21 20 19 18 17 16 15 14 13 JU2 COM C11 0.1F C7 0.01F RGND C6 0.01F JU1 REFADJ C3 0.1F C4 4.7F 10V C1 0.1F VLOGIC
J1-18 R2 51 1 HBEN D7 D6 D5 D4 D3/D11 D2/D10 D1/D9 D0/D8 INT RD WR CLK CS CH3 CH2 CH1 CH0 C5 4.7F 10V COM GND REFADJ REF VDD C2 4.7F 10V VLOGIC 2 3 4 5 6 7 8 9 10 VLOGIC 11 12 R1-1 47k J1-20 INT 10 R11 51 CH0 C10 0.1F J1-24 WR C9 0.1F R5 51
R1-H 47k
9
R1-F R1-E R1-D R1-C R1-B R1-A 47k 47k 47k 47k 47k 47k 8 7 6 5 4 3 2
MAX1292
HBEN
J1-16
J1-14
J1-12
Figure 1. MAX1292 EV Kit Schematic
REF J1-22 RD R4 51 R10 51 CH1 J1-26 CLK CH2 J1-28 CS R7 51 C8 0.1F R8 51 CH3 C12 0.1F N.C. N.C. R12 51 R6 51 R9 51
J1-10
J1-8
J1-6
J1-4
J1-2
J1-1
J1-3
J1-5
J1-7
J1-9
J1-11
J1-13
J1-15
J1-17
J1- 19
J1-21
J1-23
J1-25
J1-27
J1-29
J1-31
J1-33
J1-35
J1-37
J1-39
N.C.
J1-36
J1-40
N.C.
J1-38
J1-30
N.C.
Evaluates: MAX1292/MAX1293
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J1-32
N.C.
J1-34
N.C.
MAX1292 Evaluation Kit
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MAX1292 Evaluation Kit Evaluates: MAX1292/MAX1293
1.0"
1.0"
Figure 2. MAX1292 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX1292 EV Kit PC Board Layout--Component Side
1.0"
1.0"
Figure 4. MAX1292 EV Kit PC Board Layout--Interior Layer 1
Figure 5. MAX1292 EV Kit PC Board Layout--Interior Layer 2
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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 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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