AD7914BRUZ Analog Devices Inc, AD7914BRUZ Datasheet - Page 14

• Manufacturer Part Number: AD7914BRUZ
• Description: 10-Bit 4,CH 1 Msps ADC I.C.
• Manufacturer: Analog Devices Inc

Specifications of AD7914BRUZ

• Number Of Bits: 10
• Sampling Rate (per Second): 1M
• Data Interface: DSP, MICROWIRE™, QSPI™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 13.5mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP (0.173", 4.40mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-AD79X4CBZ - BOARD EVALUATION FOR AD79X4CBZ
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD7904/AD7914/AD7924
ADD1
0
0
1
1
PM1 PM0 Mode
1
1
0
0
1
0
1
0
ADD0
0
1
0
1
Normal Operation. In this mode, the AD7904/
AD7914/AD7924 remain in full power mode
regardless of the status of any of the logicinputs.
This mode allows the fastest possible throughput
rate from the AD7904/AD7914/AD7924.
Full Shutdown. In this mode, the AD7904/
AD7914/AD7924 is in full shutdown mode with all
circuitry on the AD7904/AD7914/AD7924
powering down. The AD7904/AD7914/AD7924
retains the information in the Control Register
while in full shutdown. The part remains in full
shutdown until these bits are changed.
Auto Shutdown. In this mode, the AD7904/
AD7914/AD7924/ automatically enters full
shutdown mode at the end of each conversion
when the control register is updated. Wake-up
time from full shutdown is 1 µs and the user
should ensure that 1 µs has elapsed before
attempting to perform a valid conversion on the
part in this mode.
Invalid Selection. This configuration is not allowed.
Table III. Power Mode Selection
Table II. Channel Selection
Analog Input Channel
V
V
V
V
IN
IN
IN
IN
0
1
2
3
–14–
SEQUENCER OPERATION
The configuration of the SEQ1 and SEQ0 bits in the control
register allows the user to select a particular mode of operation
of the sequencer function. Table IV outlines the three modes of
operation of the Sequencer.
Figure 2 reflects the traditional operation of a multichannel ADC,
where each serial transfer selects the next channel for conversion.
In this mode of operation the Sequencer function is not used.
Figure 3 shows how to program the AD7904/AD7914/AD7924
to continuously convert on a sequence of consecutive channels
from Channel 0 to a selected final channel. To exit this mode of
operation and revert back to the traditional mode of operation of a
multichannel ADC (as outlined in Figure 2), ensure that the
WRITE bit = 1 and SEQ1 = SEQ0 = 0 on the next serial transfer.
SEQ1 SEQ0
0
1
1
X
0
1
Sequence Type
This configuration means that the sequence
function is not used. The analog input channel
selected for each individual conversion is
determined by the contents of the channel
address bits ADD1, ADD0 in each prior write
operation. This mode of operation reflects the
traditional operation of a multichannel ADC,
without the Sequencer function being used, where
each write to the AD7904/AD7914/AD7924
selects the next channel for conversion
(see Figure 2).
If the SEQ1 and SEQ0 bits are set in this way
then the sequence function will not be interrupted
upon completion of the WRITE operation. This
allows other bits in the Control Register to be
altered between conversions while in a sequence
without terminating the cycle.
This configuration is used in conjunction with
the channel address bits ADD1, ADD0 to
program continuous conversions on a consecutive
sequence of channels from Channel 0 to a selected
final channel as determined by the channel
address bits in the Control Register (see Figure 3).
Table IV. Sequence Selection
REV. 0