MAX117EVKIT-DIP Maxim Integrated Products, MAX117EVKIT-DIP Datasheet - Page 2

• Manufacturer Part Number: MAX117EVKIT-DIP
• Description: EVAL KIT FOR MAX117
• Manufacturer: Maxim Integrated Products

Specifications of MAX117EVKIT-DIP

• Number Of Adc's: 1
• Number Of Bits: 8
• Sampling Rate (per Second): 400k
• Data Interface: Parallel
• Inputs Per Adc: 8 Single Ended
• Input Range: ±VREF
• Power (typ) @ Conditions: 4.5mW @ 400kSPS
• Voltage Supply Source: Single Supply
• Operating Temperature: 0°C ~ 70°C
• Utilized Ic / Part: MAX117, MAX118
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

MAX117 Evaluation Kit
Table 1. Jumper Configuration for
Continuous-Conversion Operation
The MAX117 reference can be connected to any volt-
age between V
the power-supply rails as the reference voltage, short
jumper JU7 and install a shunt on JU1 (in either posi-
tion). When using an external reference, remove the
shunts from JU1 and JU7, and apply your external ref-
erence source to the VREF+ and VREF- pads.
A 74HC04, configured as a free-running oscillator, pro-
vides the continuous-conversion signals (CS and RD)
on the evaluation board. The oscillator output also
clocks the MAX117 conversion results into a 74HC564
octal latch for display by eight LEDs.
The oscillator must be disconnected when the MAX117
is controlled by external circuitry. Remove the shunts
from jumpers JU4, JU6, and JU8 to disconnect the
on-board oscillator. For additional flexibility, the digital
signals and data outputs are available at the 20-pin
connector, J1.
2
_______________Detailed Description
JUMPER
JU1
JU2
JU3
JU4
JU5
JU6
JU7
JU8
_______________________________________________________________________________________
CONNECTION
Shorted
Shorted
Shorted
Shorted
Shorted
DD
Open
1 & 2
2 & 3
and ground (V
MAX117 Reference Voltage
Continuous Conversions
Connects REF- to the drain
of N1 (see the Shutdown
section).
Sets the MAX117 for READ
mode operation (MODE = low).
Enables the LED display.
Connects the CS pin to the
on-board oscillator.
Connects the MAX117’s V
pin to the on-board EV kit’s
VDD pad.
Connects the RD pin to the
on-board oscillator.
Connects the MAX117’s REF+
pin to VDD.
Connects a pull-up resistor to
the WR/RDY pin.
REF
FUNCTION
+ ≥ V
REF
-). To use
DD
When switch PD is set to the on position, the MAX117
enters shutdown mode. In shutdown mode, the supply
current drops below 1µA (excluding the reference cur-
rent). The internal resistance from REF+ to REF- is typi-
cally 2kΩ, and current will flow through it even when the
MAX117 is shut down. The evaluation kit uses a low-
R
from ground when the MAX117’s PWRDN pin is driven
low. This MOSFET has less than 1Ω of on-resistance at
2.7V V
appearing at REF-. Jumper JU1 allows the user to
remove N1 from the circuit to evaluate user-specific cir-
cuit configurations.
The current supplied to the board includes the current
drawn by the MAX117, the on-board oscillator, the out-
put latch, and the LED display. Jumper JU5 is in series
with the MAX117 V
current measurements. Measure the MAX117 supply
current or shutdown current by removing the shunt that
normally shorts JU5, and connecting an ammeter
across the two jumper pins. Refer to Table 2 for the
appropriate jumper/switch settings.
Table 2. Jumper/Switch Settings for
MAX117 Current Measurements
Supply Current,
V
reference current)
Supply Current (excluding
reference current
Power-Down Current
DS(ON)
REF
MEASUREMENT
= V
GS
CURRENT
, N-channel MOSFET (N1) to disconnect REF-
DD
to prevent an excessive offset error from
(including
DD
pin to facilitate MAX117 supply-
2 & 3 or
Current Measurement
Open
1 & 2
1 & 2
JU1
JUMPERS
Shorted
Open
JU7
N/A
Shutdown
SWITCH
PD
Off
Off
On