Datasheet

AD7678
Rev. A | Page 19 of 28
POWER DISSIPATION VERSUS THROUGHPUT
The AD7678 automatically reduces its power consumption at
the end of each conversion phase. During the acquisition phase,
the operating currents are very low, which allows for a signifi-
cant power savings when the conversion rate is reduced, as
shown in Figure 26. This feature makes the AD7678 ideal for
very low power battery applications.
It should be noted that the digital interface remains active even
during the acquisition phase. To reduce the operating digital
supply currents even further, the digital inputs need to be
driven close to the power rails (DVDD and DGND), and
OVDD should not exceed DVDD by more than 0.3 V.
SAMPLING RATE (SPS)
POWER DISSIPATION (mW)
100000
10000
1000
100
10
1
0.1
100
k
10k1k1001
10
PDBUF HIGH
03084-0-032
Figure 26. Power Dissipation vs. Sample Rate
CONVERSION CONTROL
Figure 27 shows the detailed timing diagrams of the conversion
process. The AD7678 is controlled by the
CNVST
signal, which
initiates conversion. Once initiated, it cannot be restarted or
aborted, even by the power-down input PD, until the
conversion is complete. The
CNVST
signal operates
independently of the
CS
and
RD
signals.
CNVST
t
1
t
2
MODE ACQUIRE CONVERT ACQUIRE CONVERT
t
7
t
8
BUSY
t
4
t
3
t
5
t
6
03084-0-033
Figure 27. Basic Conversion Timing
Although
CNVST
is a digital signal, it should be designed with
special care with fast, clean edges and levels with minimum
overshoot and undershoot or ringing.
For other applications, conversions can be automatically
initiated. If
CNVST
is held low when BUSY is low, the AD7678
controls the acquisition phase and then automatically initiates a
new conversion. By keeping
CNVST
low, the AD7678 keeps the
conversion process running by itself. It should be noted that the
analog input has to be settled when BUSY goes low. Also, at
power-up,
CNVST
should be brought low once to initiate the
conversion process. In this mode, the AD7678 could sometimes
run slightly faster than the guaranteed limits of 100 kSPS.
t
9
RESET
DATA
BUS
BUSY
CNVST
t
8
03084-0-034
Figure 28. RESET Timing