AD7294 Analog Devices, AD7294 Datasheet - Page 13

• Manufacturer Part Number: AD7294
• Description: 12-Bit Monitor and Control System with Multichannel ADC, DACs, Temperature Sensor, and Current Sense
• Manufacturer: Analog Devices

Specifications of AD7294

• Resolution (bits): 12bit
• # Chan: 9
• Sample Rate: 200kSPS
• Interface: I²C/Ser 2-Wire,Ser
• Analog Input Type: Diff-Uni,SE-Uni
• Ain Range: (Vref) p-p,2 V p-p,Uni (Vref),Uni (Vref) x 2
• Adc Architecture: SAR
• Pkg Type: CSP

Data Sheet
TQFP Pin No.
40
41
42
43, 47, 48
44
46, 45
49, 50, 51, 52
53
54
62, 63
LFCSP Pin No.
35
36
37
38, 42
39
41, 40
43, 44, 45, 46
47
48
55, 56
EP
Mnemonic
SCL
OPGND
V
DGND
DV
I
OVERRANGE,
I
OVERRANGE
V
REF
DCAP
V
Exposed Pad
SENSE
SENSE
DRIVE
IN
PP
3 to V
DD
1, V
OUT
1
2
/REF
PP
2
IN
0
IN
ADC
Rev. H | Page 13 of 48
Description
Serial I
100 kHz and 400 kHz operating modes.
resistor required.
Dedicated Ground Pin for I
Logic Power Supply. The voltage supplied at this pin determines at what
voltage the interface operates. Decouple this pin to DGND. The voltage range
on this pin is 2.7 V to 5.5 V and may be different to the voltage level at AV
and DV
and output thresholds, connect this pin to the supply to which the I
pulled.
Digital Ground. This pin is the ground for all digital circuitry.
Logic Power Supply. The operating range is 4.5 V to 5.5 V. These pins provide
the supply voltage for all the digital circuitry on the AD7294. Connect the AV
and DV
Decouple this supply to DGND with a10 µF tantalum capacitor and a 0.1 µF
ceramic capacitor.
Fault Comparator Outputs. These pins connect to the high-side current sense
amplifiers.
Uncommitted ADC Analog Inputs. These pins are programmable as four
single-ended channels or two true differential analog input channel pairs. See
Table 1 and Table 13 for more details.
ADC Reference Input/Output Pin. The REF
reference source for the ADC. Upon power-up, the default configuration of this
pin is external reference (REF
power-down register; see Table 27. Connect decoupling capacitors (220 nF
recommended) to this pin to decouple the reference buffer. Provided the
output is buffered, the on-chip reference can be taken from this pin and
applied externally to the rest of a system. A maximum external reference
voltage of 2.5 V can be supplied to the REF
ADC pin.
External Decoupling Capacitor Input for Internal Temperature Sensor.
Decouple this pin to AGND using a 0.1 μF capacitor. In normal operation, the
voltage is typically 3.7 V.
Current Sensor Supply Pins. Power supply pins for the high-side current sense
amplifiers. Operating range is from AV
AGND. See the Current Sense Filtering section.
The exposed pad is located on the underside of the package. Connect the
exposed pad to the ground plane of the PCB using multiple vias.
2
C Bus Clock. The data transfer rate in I
DD
DD
, but should never exceed either by more than 0.3 V. To set the input
pins together to ensure that all supply pins are at the same potential.
2
C Interface.
IN
). Enable the internal reference by writing to the
DD
Open-drain input; external pull-up
to 59.4 V. Decouple this supply to
OUT
OUT
/REF
2
C mode is compatible with both
portion of the REF
IN
ADC pin provides the
OUT
AD7294
/REF
2
C bus is
IN
DD
DD