MAX117 Evaluation MAX117 evaluation kit) fully assembled evaluati

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MAX117 Evaluation MAX117 evaluation kit) fully assembled evaluati

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19-1104; 7/96
MAX117 Evaluation
MAX117 evaluation kit) fully assembled evaluation board 8-bit, 8-channel, MAX117 analog-to-digital converter. Channel selection controlled switches located board userprovided logic-level signals. on-board oscillator provides continuous conversions, conversion results appear output display. MAX117 also evaluates MAX118. evaluate MAX118, order MAX118 free sample, replace MAX117 with MAX118, install appropriate resistor (see Component List).
_Features
(MAX117) (MAX118) Operation Fully Assembled Tested On-Board Oscillator Generates Timing Signals Display Conversion Results Low-Power Shutdown Mode
Evaluates: MAX117/MAX118
_Component List
DESIGNATION C5-C8 JU1, JU2, JU3, JU5-JU8 LED1-LED8 DESCRIPTION 22µF, electrolytic capacitors 0.1µF, ceramic capacitors 1000pF, ceramic capacitor 20-pin ribbon-cable connector 3-pin jumper headers 2-pin jumper headers LEDs Low-RDS(ON), N-channel International Rectifier IRML2402* 100k resistors resistors 330, 10-pin resistor (installed, used with MAX117) 560, 10-pin resistor (not installed, used with MAX118) None None None 5.1k resistor 4-position switch MAX117CPI 74HC564 inverting 8-bit latch 74HC04 inverter Shunts Printed circuit board Rubber feet
_Ordering Information
PART MAX117EVKIT-DIP TEMP. RANGE +70°C BOARD TYPE Through Hole
Note: evaluate MAX118, request MAX118CPI free sample.
_Quick Start
Verify operation MAX117 evaluation board configuring continuous conversions using onboard oscillator. Take following steps: Verify that jumpers configured shown Table Connect +3V, 100mA supply pad. 20mA supply sufficient output display disabled. evaluate MAX118, supply replace 330, 10-pin resistor (R9) with resistor included kit. Connect input signal AIN1 input pad. switch SW1, position position (Table Observe conversion results display input voltage varied between ground supply voltage.
*International Rectifier: (310) 322-3331
Maxim Integrated Products
free samples latest literature: http://www.maxim-ic.com, phone 1-800-998-8800
MAX117 Evaluation Evaluates: MAX117/MAX118
Table Jumper Configuration Continuous-Conversion Operation
JUMPER CONNECTION FUNCTION Connects REF- drain (see Shutdown section). Sets MAX117 READ mode operation (MODE low). Enables display. Connects on-board oscillator. Connects MAX117's on-board kit's pad. Connects on-board oscillator. Connects MAX117's REF+ VDD. Connects pull-up resistor WR/RDY pin.
Shutdown
When switch position, MAX117 enters shutdown mode. shutdown mode, supply current drops below (excluding reference current). internal resistance from REF+ REF- typically current will flow through even when MAX117 shut down. evaluation uses lowRDS(ON), N-channel MOSFET (N1) disconnect REFfrom ground when MAX117's PWRDN driven low. This MOSFET less than on-resistance 2.7V prevent excessive offset error from appearing REF-. Jumper allows user remove from circuit evaluate user-specific circuit configurations.
Open Shorted
Shorted
Current Measurement
current supplied board includes current drawn MAX117, on-board oscillator, output latch, display. Jumper series with MAX117 facilitate MAX117 supplycurrent measurements. Measure MAX117 supply current shutdown current removing shunt that normally shorts JU5, connecting ammeter across jumper pins. Refer Table appropriate jumper/switch settings.
Shorted Shorted Shorted
_Detailed Description
MAX117 Reference Voltage
MAX117 reference connected voltage between ground (VREF+ VREF-). power-supply rails reference voltage, short jumper install shunt either position). When using external reference, remove shunts from JU7, apply your external reference source VREF+ VREF- pads.
Table Jumper/Switch Settings MAX117 Current Measurements
CURRENT MEASUREMENT Supply Current, VREF (including reference current) Supply Current (excluding reference current Power-Down Current JUMPERS Open Shorted SWITCH
Open
Continuous Conversions
74HC04, configured free-running oscillator, provides continuous-conversion signals evaluation board. oscillator output also clocks MAX117 conversion results into 74HC564 octal latch display eight LEDs. oscillator must disconnected when MAX117 controlled external circuitry. Remove shunts from jumpers JU4, JU6, disconnect on-board oscillator. additional flexibility, digital signals data outputs available 20-pin connector,
MAX117 Evaluation
Table Jumper Functions
JUMPER POSITION Open Shorted Open Shorted Open FUNCTION Connects REF- drain MOSFET (see Shutdown section). Connects REF- ground. MODE pulled internally driven external circuitry. Connects MODE VDD. Disables display. Enables display. Connects ground. Connects on-board oscillator. must controlled external logic. Connects ammeter across pins measure supply current. Connects MAX117's pad. must controlled external logic. Connects on-board oscillator. external source must connected REF+ pad. REF+ connected VDD. pull-up connected WR/RDY pin. Connects 5.1k pull-up resistor WR/RDY pin.
Jumper Selections
Jumpers JU1-JU8 allow user various configuration options kit. Table lists various jumper functions.
Evaluates: MAX117/MAX118
Switch Selections
four-position switch (SW1) used select input channel enable/disable power-down mode. address pins (A0-A2) power-down (PWRDN) pulled through 100k resistor. These pins connected ground when associated switch (A0, position. switches must position external logic control input-channel selection powerdown mode.
Table Switch Selections
INPUT CHANNEL
Open Shorted Open Shorted Open Shorted Open Shorted
IN8, analog input internally connected REF+; channel selection controlled externally. MAX117 shutdown (PWRDN grounded).
Evaluates: MAX117/MAX118
MAX117 Evaluation
Figure MAX117 Schematic
22µF 100k LEDs LED1 LED2 J1-5 J1-6 LED4 LED5 LED6 LED7 LED8
0.1µF J1-8 J1-9 J1-10 J1-11 J1-12 J1-14 MODE J1-13 MODE J1-3 WR/RDY PWRDN REF+ J1-7 REFCS J1-1 J1-2 5.1k J1-15 74HC04 74HC04 74HC04 74HC04 1000pF WR/RDY WR/RDY J1-4 MODE REF+ 22µF 100k IRLML2402 REF2 0.1µF J1-17 100k J1-18 100k LED3 0.1µF J1-20 J1-19 74HC564
MAX117
J1-16 100k
74HC04 74HC04 0.1µF
0.1µF
PWRDN REF+
REFVDD
MAX117 Evaluation Evaluates: MAX117/MAX118
Figure MAX117 Component Placement Guide-Component Side
MAX117 Evaluation Evaluates: MAX117/MAX118
Figure MAX117 Board Layout-Component Side
MAX117 Evaluation Evaluates: MAX117/MAX118
Figure MAX117 Board Layout-Solder Side
MAX117 Evaluation Evaluates: MAX117/MAX118
NOTES
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 (408) 737-7600 1996 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

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