AD7821KPZ Analog Devices Inc, AD7821KPZ Datasheet - Page 13

• Manufacturer Part Number: AD7821KPZ
• Description: 8-BIT ATC CONVERTER IC
• Manufacturer: Analog Devices Inc

Specifications of AD7821KPZ

• Number Of Bits: 8
• Sampling Rate (per Second): 1M
• Data Interface: Parallel
• Number Of Converters: 3
• Power Dissipation (max): 50mW
• Voltage Supply Source: Dual ±
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-LCC (J-Lead)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

REV. B
SIMULTANEOUS SAMPLING ADC
The AD7821’s inherent track-and-hold and well defined sampling
instant makes it useful in such applications as sonar, where a num-
ber of input channels are required to be sampled simultaneously.
Figure 22 shows a circuit for such an application.
Figure 21. 16-Channel Telecom ADC System
S
–13–
The actual sampling instant at which V
approximately 50 ns after the falling edge of WR or RD in the
WR-RD or RD modes, respectively, due to internal logic delays.
However, the internal logic delay and, therefore, the sampling
instant can vary from device to device, but is typically within ±5 ns.
This means that a maximum common input sine wave of ± 2.5 V
at 32 kHz, applied to any number of AD7821s in the circuit of
Figure 22, will yield a maximum difference between the converter
outputs of typically ± 1/4 LSB.
Figure 22. Simultaneous Sampling ADCs
IN
is measured occurs
AD7821