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AD7862AN-10 Arkusz danych(PDF) 9 Page - Analog Devices

Numer części AD7862AN-10
Szczegółowy opis  Simultaneous Sampling Dual 250 kSPS 12-Bit ADC
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Strona internetowa  http://www.analog.com
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AD7862
–9–
REV. 0
and fourth read pulses, after the second conversion and A0 high,
access the result from Channel B (VB1 and VB2 respectively). A0’s
state can be changed any time after the CONVST goes high,
i.e., track/holds into hold, and 400 ns prior to the next falling
edge of CONVST. Data is read from the part via a 12-bit
parallel data bus with standard CS and RD signal, i.e., the read
operation consists of a negative going pulse on the CS pin
combined with two negative going pulses on the RD pin (while
the CS is low), accessing the two 12-bit results. Once the read
operation has taken place, a further 300 ns should be allowed
before the next falling edge of CONVST to optimize the settling
of the track/hold amplifier before the next conversion is initiated.
With the internal clock frequency at its maximum (3.7 MHz—not
accessible externally), the achievable throughput rate for the
part is 3.6
µs (conversion time) plus 100 ns (read time) plus
0.3
µs (acquisition time). This results in a minimum throughput
time of 4
µs (equivalent to a throughput rate of 250 kHz).
Read Options
Apart from the read operation described above and displayed in
Figure 5a, other CS and RD combinations can result in
different channels/inputs being read in different combinations.
Suitable combinations are shown in Figures 5b through 5d.
VA1
VA2
CS
RD
DATA
Figure 5b. Read Option A
VA1
VA2
CS
RD
DATA
VA1
Figure 5c. Read Option B
VA1
VB1
A0
CS
RD
DATA
Figure 5d. Read Option C
OPERATING MODES
Mode 1 Operation (High Sampling Performance)
The timing diagram in Figure 5a is for optimum performance in
operating mode 1 where the falling edge of CONVST starts
conversion and puts the track/hold amplifiers into their hold
mode. This falling edge of CONVST also causes the BUSY
signal to go high to indicate that a conversion is taking place.
The BUSY signal goes low when the conversion is complete,
which is 3.6
µs max after the falling edge of CONVST, and new
data from this conversion is available in the output latch of the
AD7862. A read operation accesses this data. If the multiplexer
select A0 is low, the first and second read pulses after the first
conversion access the result from Channel A (VA1 and VA2
VA1
VA2
VB1
VB2
t
3
t
1
t
2
t
4
t
5
t
6
t
CONV = 3.6µs
t7
CONVST
BUSY
A0
CS
RD
DATA
300ns
400ns
Figure 5a. Mode 1 Timing Operation Diagram for High Sampling Performance


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