AD7492ARZ Analog Devices Inc, AD7492ARZ Datasheet - Page 15

• Manufacturer Part Number: AD7492ARZ
• Description: IC ADC 12BIT W/REF W/CLK 24-SOIC
• Manufacturer: Analog Devices Inc

Specifications of AD7492ARZ

• Data Interface: Parallel
• Number Of Bits: 12
• Sampling Rate (per Second): 1.25M
• Number Of Converters: 1
• Power Dissipation (max): 16.5mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (0.300", 7.50mm Width)
• Resolution (bits): 12bit
• Input Channel Type: Single Ended
• Supply Voltage Range - Analogue: 2.7V To 5.25V
• Supply Voltage Range - Digital: 2.7V To 5.25V
• Supply Current: 3mA
• Sampling Rate: 1MSPS
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-AD7492CBZ - BOARD EVALUATION FOR AD7492
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

AD7492 to 80C186 Interface
Figure 23 shows the AD7492 interfaced to the 80C186 micropro-
cessor. The 80C186 DMA controller provides two independent
high-speed DMA channels where data transfer can occur between
memory and I/O spaces. (The AD7492 occupies one of these I/O
spaces.) Each data transfer consumes two bus cycles, one cycle
to fetch data and the other to store data.
After the AD7492 has finished conversion, the BUSY line gen-
erates a DMA request to Channel 1 (DRQ1). As a result of the
interrupt, the processor performs a DMA READ operation
which also resets the interrupt latch. Sufficient priority must
be assigned to the DMA channel to ensure that the DMA
request will be serviced before the completion of the next con-
version. This configuration can be used with 6 MHz and 8 MHz
80C186 processors.
80C186
AD0–AD15
A16–A19
DRQ1
ALE
RD
ADDITIONAL PINS OMITTED FOR CLARITY
ADDRESS/DATA BUS
ADDRESS
DECODER
Q
ADDRESS
LATCH
R
S
ADDRESS
BUS
DATA BUS
AD7492
CS
BUSY
RD
DB0–DB9
(DB11)
OPTIONAL
AD7492
CONVST