AD7367-5ARUZ-REEL7 AD [Analog Devices], AD7367-5ARUZ-REEL7 Datasheet - Page 12

• Manufacturer Part Number: AD7367-5ARUZ-REEL7
• Description: True Bipolar Input, Dual 1us, 14-Bit, 2-Channel SAR ADC
• Manufacturer: AD [Analog Devices]

AD7367
V
The AD7367 also has a V
which the serial interface operates. V
easily interface to both 3 V and 5 V processors. For example, if
the AD7367 was operated with a V
be powered from a 3 V supply, allowing a large dynamic range
with low voltage digital processors. Thus, the AD7367 could be
used with the ±10 V input range while still being able to
interface to 3 V digital parts.
To achieve the maximum throughput rate of 1Msps V
be greater than or equal to 4.75V, see table 3. The maximum
throughput rate for the AD7367 with the V
less than 4.75 and greater than 2.7 is 900 Ksps.
REFERENCE
The AD7367 can operate with either the internal 2.5 V on-chip
reference or an externally applied reference. The logic state of
the REFSEL pin determines whether the internal reference is
used. The internal reference is selected for both ADC when the
REFSEL pin is tied to logic high. If the REFSEL pin is tied to
GND then an external reference can be supplied through the
D
DRIVE
CAP
A and D
CAP
B pins. On power-up, the REFSEL pin must be
DRIVE
feature to control the voltage at
CC
DRIVE
of 5 V, the V
allows the ADC to
DRIVE
voltage set to
DRIVE
DRIVE
pin could
must
Rev. PrD | Page 12 of 16
tied to either a low or high logic state for the part to operate.
Suitable reference sources for the AD7367 include AD780,
AD1582, ADR431, REF193, and ADR391.
to AGND using a 680nF capacitor. It is recommended that the
internal reference be buffered before applying it elsewhere in
the system. The internal reference is capable of sourcing up to
150 μA with an analog input range of ±10 and 60 μA for both
the ±5V and 0-10V ranges.
If the internal reference operation is required for the ADC
conversion, the REFSEL pin must be tied to logic high on
power-up. The reference buffer requires 500 µs to power up and
charge the 680nF decoupling capacitor during the power-up
time.
The AD7367 is specified for a 2.5 V to 3 V reference range.
When a 3V reference is selected, the ranges are ±12 V, ±6 V, and
0 V to +12 V. For these ranges, the V
equal to or greater than the +12V &-12V respectively.
The internal reference circuitry consists of a 2.5 V band gap
reference and a reference buffer. When operating the AD7367
in internal reference mode, the 2.5 V internal reference is
available at D
CAP
A and D
Preliminary Technical Data
CAP
B pins, which should be decoupled
DD
and V
SS
supply must be