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19-1646; Rev 0; 2/00
MAX1294 Evaluation Kit
General Description
The MAX1294 evaluation kit (EV kit) is assembled with a MAX1294 and the basic components necessary to evaluate the 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 the conventional miniclips. BNC connectors with 50 termination 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 420ksps. The MAX1294 EV kit may also be used to evaluate the MAX1295. Request a free sample of the MAX1295BCEI when ordering the MAX1294 EV kit. o 12-Bit Analog-to-Digital Conversion o Six Input Channels o 12-Bit-Wide Digital Interface o Internal Track and Hold o 420kHz Sampling Rate o Internal 2.5V Reference o Internal Clock o Low-Power Standby Mode o Fully Assembled Surface-Mount Board
Features
Evaluates: MAX1294/MAX1295
Ordering Information
PART MAX1294EVKIT TEMP. RANGE 0C to +70C IC PACKAGE 28 QSOP
Component List
DESIGNATION QTY C1, C3 C2, C6-C12 C4, C5 INT, RD, WR, CLK, CS, COM, CH0-CH5 J1 JU1, JU2 R1, R2 R4-R14 U1 None None None 2 8 2 12 1 2 2 11 1 2 1 1 DESCRIPTION 4.7F, 10V tantalum capacitors AVX TAJB475M010R 0.1F ceramic capacitors 0.01F ceramic capacitors BNC connectors 40-pin header 2-pin headers 47k, 9-resistor, 10-pin SIPs 51 5% resistors MAX1294BCEI Shunts MAX1294 printed circuit board MAX1294 data sheet
Quick Start
The MAX1294 EV kit comes fully assembled and tested. The following equipment is required: * A +5V linear power supply (switching supplies will induce 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 conversion results of the MAX1294. Connect the logic analyzer using a 40-pin ribbon cable or a combination of BNC cables, ribbon cable, and miniclips. Refer to the MAX1294 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 best 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 MAX1294/MAX1296 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.
________________________________________________________________ Maxim Integrated Products
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MAX1294 Evaluation Kit Evaluates: MAX1294/MAX1295
Connections and Setup
Connect all supplies and signal lines before turning on any supply or signal source: 1) Connect a +5V power supply to the VDD pad. Connect the ground to the AGND pad. The DGND provides additional access to the digital ground plane. 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- CH5). 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-D11. These signals are available on the 40-pin header (Table 2). 5) Connect the digital control signals for CS, RD, and WR. These signals are available on the 40-pin header or on 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 supply, then enable the digital signal source. 8) Turn on the analog sources, and the system is ready for use. 9) Use the logic analyzer for data analysis.
Table 1. Jumper Functions
SHUNT LOCATION SHDN PIN Open JU1 Shorted Open JU2 Shorted MAX1294 OUTPUT REFADJ pin open or driven externally REFADJ pin shorted to VDD* COM pin open or driven externally COM pin shorted to AGND
*The MAX1294'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 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 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 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 may 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 MAX1294 evaluation board uses two separate 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 23) of the MAX1294. 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.
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AGND R2-C 47k R2-D 47k R2-E 47k R2-F 47k R2-G 47k R2-H 47k DGND R1-H 47k R1-G 47k J1-22 D10 28 J1-24 J1-5 VDD VDD J1-9 J1-11 REF 6 D4 GND 23 COM 22 CH0 21 CH1 20 CH2 19 CH3 18 CH4 17 JU2 C6 0.1F CH5 16 CS 15 C5 0.01F JU1 RGND C4 0.01F C3 4.7F 10V 7 D3 8 D2 9 D1 10 D0 11 INT R1-F 47k 12 RD 13 WR 14 CLK J1-13 J1-15 J1-17 REF ADJ J1-19 J1-21 J1-23 J1-25 J1-27 COM J1-29 J1-31 R8 51 CH0 R4 51 C7 0.1F R9 51 CH1 R5 51 C8 0.1F R10 51 CH2 R6 51 C9 0.1F R11 51 CH3 R7 51 C10 0.1F R12 51 CH4 R13 51 C11 0.1F C12 0.1F R14 51 N.C. N.C. N.C. J1-33 J1-35 J1-37 J1-39 J1-7 D11 27 VDD 26 REF 25 REF ADJ 24 C2 0.1F C1 4.7F 10V J1-3 J1-1
VDD
VDD
R1-I 47k
R2-A 47k
R2-B 47k
MAX1294
1 D9 2 D8 3 D7 4 D6 5 D5
J1-20
J1-18
J1-16
J1-14
Figure 1. MAX1294 EV Kit Schematic
J1-38 J1-40 J1-36
J1-12
J1-10
J1-8
J1-6
J1-4
VDD
R2-I 47k
J1-2
INT
J1-26
RD
J1-28
WR
J1-30
CLK
J1-32
CS
J1-34
Evaluates: MAX1294/MAX1295
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CH5
MAX1294 Evaluation Kit
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MAX1294 Evaluation Kit Evaluates: MAX1294/MAX1295
1.0"
Figure 2. MAX1294 EV Kit Component Placement Guide--Component Side
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MAX1294 Evaluation Kit Evaluates: MAX1294/MAX1295
1.0"
Figure 3. MAX1294 EV Kit PC Board Layout--Component Side
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MAX1294 Evaluation Kit Evaluates: MAX1294/MAX1295
1.0"
Figure 4. MAX1294 EV Kit PC Board Layout--Interior Layer 1
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MAX1294 Evaluation Kit Evaluates: MAX1294/MAX1295
1.0"
Figure 5. MAX1294 EV Kit PC Board Layout--Interior Layer 2
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MAX1294 Evaluation Kit Evaluates: MAX1294/MAX1295
1.0"
Figure 6. MAX1294 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.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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