MAX116EVKIT Maxim Integrated Products, MAX116EVKIT Datasheet - Page 12

• Manufacturer Part Number: MAX116EVKIT
• Description: EVAL KIT FOR MAX116
• Manufacturer: Maxim Integrated Products

Specifications of MAX116EVKIT

• Number Of Adc's: 1
• Number Of Bits: 12
• Sampling Rate (per Second): 116k
• Data Interface: Parallel
• Inputs Per Adc: 8 Single Ended
• Input Range: ±2.5 V
• Power (typ) @ Conditions: 17mW @ 116kSPS
• Voltage Supply Source: Analog and Digital
• Operating Temperature: 0°C ~ 70°C
• Utilized Ic / Part: MAX116
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

(LSB) values. Output coding is two-complement binary
with 1LSB = 2.44mV for the MAX115 and
1LSB = 1.22mV for the MAX116.
An output demultiplexer circuit is useful for isolating
data from one channel in a four-channel conversion
sequence. Figure 9’s circuit uses the external 16MHz
clock and the INT signal to generate four RD pulses
and a latch clock to save data from the desired chan-
nel. CS must be low during the four RD pulses. The
channel is selected with the binary coding of two
switches. A 16-bit 16373 latch simplifies layout.
2x4-Channel, Simultaneous-Sampling
12-Bit ADCs
Figure 9. Output Demultiplexer Circuit
12
______________________________________________________________________________________
V
CC
INT
PRE
D
CLR
1/2 HC74
Q
Q
EXTERNAL
CLOCK
V
CC
Output Demultiplexer
V
CC
V
CC
CLR
ENP
ENT
LOAD
A
B
C
D
HC161
10kΩ
(LSB) 0
RCO
CH1
CH2
CH3
CH4
1
2
3
0
1
0
1
Vector motor control requires monitoring of the individ-
ual phase currents. In their most basic application, the
MAX115/MAX116 simultaneously sample two currents
(CH1A and CH2A, Figure 10) and preserve the neces-
sary relative phase information. Only two of the three
phase currents have to be digitized because the third
component can be mathematically derived with a coor-
dinate transformation.
The circuit of Figure 10 shows a typical vector motor-
control application using all available inputs of the
MAX115/MAX116. CH1A and CH2A are connected
to two isolated Hall-effect current sensors and are a
0
0
1
1
EXTERNAL
CLOCK
P0
P1
P2
P3
P4
P5
P6
P7
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
HC688
Motor-Control Applications
P = Q
RD
G
LATCH
CLOCK
(TO 16373 LATCH)