AD7862ANZ-10 Analog Devices Inc, AD7862ANZ-10 Datasheet - Page 15

• Manufacturer Part Number: AD7862ANZ-10
• Description: IC ADC 12BIT DUAL 250KSPS 28DIP
• Manufacturer: Analog Devices Inc

Specifications of AD7862ANZ-10

• Data Interface: Parallel
• Number Of Bits: 12
• Sampling Rate (per Second): 250k
• Number Of Converters: 2
• Power Dissipation (max): 75mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 28-DIP (0.600", 15.24mm)
• Resolution (bits): 12bit
• Sampling Rate: 250kSPS
• Input Channel Type: Single Ended
• Supply Voltage Range - Analog: 4.75V To 5.25V
• Supply Current: 15mA
• Digital Ic Case Style: DIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

MULTIPLE AD7862S
Figure 20 shows a system where a number of AD7862s can be
configured to handle multiple input channels. This type of
configuration is common in applications such as sonar, radar,
etc. The AD7862 is specified with typical limits on aperture
delay. This means that the user knows the difference in the
sampling instant between all channels. This allows the user to
maintain relative phase information between the different
channels.
A common read signal from the microprocessor drives the RD
input of all AD7862s. Each AD7862 is designated a unique
address selected by the address decoder. The reference output
REV. 0
SETPOINT
SETPOINT
TORQUE
*ADDITIONAL PINS OMITTED FOR CLARITY
Figure 19. Vector Motor Control Using the AD7862
FLUX
MICROPROCESSOR
TRANSFORMATION
CALCULATIONS &
TORQUE & FLUX
CONTROL LOOP
FLUX CURRENT
TWO TO THREE
COMPONENTS
TO TORQUE &
INFORMATION
PHASE
DSP
DAC
DAC
DAC
AD7862*
V
V
V
V
A2
B1
B2
A1
CIRCUITRY
DRIVE
AMPLIFIERS
ISOLATION
ATTENUATORS
VOLTAGE
I
I
I
C
B
A
V
V
B
A
MOTOR
PHASE
3
–15–
of AD7862 number 1 is used to drive the reference input of all
other AD7862s in the circuit shown in Figure 20. One VREF
pin can drive several AD7862 REF IN pins. Alternatively, an
external or system reference can be used to drive all VREF
inputs. A common reference ensures good full-scale tracking
between all channels.
Figure 20. Multiple AD7862s in Multichannel System
V
V
V
V
V
V
V
V
V
V
V
V
A1
B1
A2
B2
A1
B1
A2
B2
A1
B1
A2
B2
AD7862(1)
AD7862(2)
AD7862(n)
VREF
REF IN
REF IN
RD
RD
RD
CS
CS
CS
ADDRESS
DECODE
AD7862
RD
ADDRESS