AD7924 Analog Devices, AD7924 Datasheet - Page 21

• Manufacturer Part Number: AD7924
• Description: 4-Channel, 1 MSPS, 12-Bit A/D Converter with Sequencer in 16-Lead TSSOP
• Manufacturer: Analog Devices

Specifications of AD7924

• Resolution (bits): 12bit
• # Chan: 4
• Sample Rate: 1MSPS
• Interface: Ser,SPI
• Analog Input Type: SE-Uni
• Ain Range: Uni (Vref),Uni (Vref) x 2
• Adc Architecture: SAR
• Pkg Type: SOP

Digital Inputs
The digital inputs applied to the AD7904/AD7914/AD7924 can
go to 7 V and are not restricted by the AV
analog inputs.
Because the SCLK, DIN, and CS inputs are not restricted by the
AV
If CS , DIN, or SCLK is applied before AV
latch-up as there would be on the analog inputs if a signal
greater than 0.3 V is applied prior to AV
V
The AD7904/AD7914/AD7924 also include the V
V
V
processors. For example, if the AD7904/AD7914/AD7924 are
operated with a V
DRIVE
DRIVE
DRIVE
DD
+ 0.3 V limit, power supply sequencing issues are avoided.
controls the voltage at which the serial interface operates.
allows the ADC to easily interface to both 3 V and 5 V
DD
of 5 V, the V
DRIVE
pin can be powered
DD
DD
DD
.
, there is no risk of
+ 0.3 V limit on the
DRIVE
feature.
Rev. B | Page 21 of 32
from a 3 V supply. The AD7904/AD7914/AD7924 have better
dynamic performance with a V
interface to 3 V processors. Care should be taken to ensure that
V
Absolute Maximum Ratings section).
Reference
An external reference source should be used to supply the 2.5 V
reference to the AD7904/AD7914/AD7924. Errors in the refer-
ence source result in gain errors in the AD7904/AD7914/
AD7924 transfer function and add to the specified full-scale
errors of the part. A capacitor of at least 0.1 μF should be placed
on the REF
AD7914/AD7924 include the AD780, REF193, and AD1582.
If 2.5 V is applied to the REF
be either 0 V to 2.5 V or 0 V to 5 V, depending on the setting of
the RANGE bit in the control register.
DRIVE
does not exceed AV
IN
pin. Suitable reference sources for the AD7904/
AD7904/AD7914/AD7924
DD
IN
by more than 0.3 V (see the
pin, the analog input range can
DD
of 5 V while still being able to