SAR ADC. AD7291-EP Datasheet

AD7291-EP ADC. Datasheet pdf. Equivalent


Analog Devices AD7291-EP
Enhanced Product
FEATURES
12-bit SAR ADC
8 single-ended analog input channels
Analog input range: 0 V to 2.5 V
12-bit temperature to digital converter
Temperature sensor accuracy of ±1°C typical
Channel sequencer operation
Specified for VDD of 2.8 V to 3.6 V
Logic voltage VDRIVE = 1.65 V to 3.6 V
Internal 2.5 V reference
I2C-compatible serial interface supports standard and
fast speed modes
Out of range indicator/alert function
Autocycle mode
Power-down current: 13 µA maximum
20-lead LFCSP package
ENHANCED PRODUCT FEATURES
Supports defense and aerospace applications (AQEC
standard)
Extended industrial temperature range: −55°C to +125°C
Controlled manufacturing baseline
1 assembly/test site
1 fabrication site
Product change notification
Qualification data available upon request
GENERAL DESCRIPTION
The AD7291-EP is a 12-bit, low power, 8-channel, successive
approximation analog-to-digital converter (ADC) with an
internal temperature sensor.
The device operates from a single 3.3 V power supply and
features an I2C-compatible interface. The device contains a
9-channel multiplexer and a track-and-hold amplifier with an
input bandwidth of 30 MHz. The device has an on-chip 2.5 V
reference that can be disabled to allow the use of an external
reference.
The AD7291-EP provides a 2-wire serial interface compatible
with I2C interfaces. The I2C interface supports standard and fast
I2C interface modes. The AD7291-EP normally remains in a
partial power-down state while not converting and powers up
for conversions. The conversion process can be controlled by a
command mode where conversions occur across I2C write
operations or an autocycle mode selected through software control.
8-Channel, I2C, 12-Bit SAR ADC
with Temperature Sensor
AD7291-EP
FUNCTIONAL BLOCK DIAGRAM
VDD
GND
VREF
VIN0
VIN7
REF
BUF
INPUT
MUX
12-BIT
T/H
SUCCESSIVE
APPROXIMATION
ADC
AD7291-EP
TEMP
SENSOR
SEQUENCER
CONTROL LOGIC
I2C INTERFACE
PD/RST
ALERT
Figure 1.
SCL
SDA
AS1
AS0
VDRIVE
The AD7291-EP includes a high accuracy band gap temperature
sensor, which is monitored and digitized by the 12-bit ADC to
give a resolution of 0.25°C.
The AD7291-EP offers a programmable sequencer, which
enables the selection of a preprogrammable sequence of
channels for conversion.
On-chip limit registers can be programmed with high and low
limits for the conversion results; an out-of-range indicator output
(ALERT) becomes active when the programmed high or low
limits are violated by the conversion result. This output can be
used as an interrupt.
Additional application and technical information can be found
in the AD7291 data sheet.
Rev. 0
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AD7291-EP Datasheet
Recommendation AD7291-EP Datasheet
Part AD7291-EP
Description 12-Bit SAR ADC
Feature AD7291-EP; Enhanced Product FEATURES 12-bit SAR ADC 8 single-ended analog input channels Analog input range: 0 .
Manufacture Analog Devices
Datasheet
Download AD7291-EP Datasheet




Analog Devices AD7291-EP
AD7291-EP
TABLE OF CONTENTS
Features .............................................................................................. 1
Enhanced Product Features ............................................................ 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
REVISION HISTORY
7/2017—Revision 0: Initial Version
Enhanced Product
Thermal Resistance .......................................................................5
ESD Caution...................................................................................5
Pin Configuration and Function Descriptions..............................6
Typical Performance Characteristics ..............................................7
Outline Dimensions ..........................................................................8
Ordering Guide .............................................................................8
Rev. 0 | Page 2 of 8



Analog Devices AD7291-EP
Enhanced Product
AD7291-EP
SPECIFICATIONS
VDD = 2.8 V to 3.6 V; VDRIVE = 1.65 V to 3.6 V; fSCL = 400 kHz, fast SCLK mode; VREF = 2.5 V internal/external; TA = −55°C to +125°C,
unless otherwise noted.
Table 1.
Parameter
DYNAMIC PERFORMANCE
Signal-to-Noise Ratio (SNR)
Signal-to-Noise + Distortion Ratio (SINAD)
Total Harmonic Distortion (THD)
Spurious-Free Dynamic Range (SFDR)
Intermodulation Distortion (IMD)
Second-Order Terms
Third-Order Terms
Channel-to-Channel Isolation
Full Power Bandwidth2
DC ACCURACY
Resolution
Integral Nonlinearity (INL)
Differential Nonlinearity (DNL)
Offset Error
Offset Error Matching
Offset Temperature Drift
Gain Error
Gain Error Matching
Gain Temperature Drift
ANALOG INPUT
Input Voltage Ranges
DC Leakage Current
Input Capacitance2
REFERENCE INPUT/OUTPUT
Reference Output Voltage3
Long-Term Stability
Output Voltage Hysteresis
Reference Input Voltage Range4
DC Leakage Current
VREF Output Impedance
Reference Temperature Coefficient
VREF Noise2
LOGIC INPUTS (SDA, SCL)
Input High Voltage, VINH
Input Low Voltage, VINL
Input Current, IIN
Input Capacitance, CIN2
Input Hysteresis, VHYST
Min
Typ Max
70
71
70
71
−84 −78
−85 −80
−88
−88
−100
30
10
Unit1
dB
dB
dB
dB
dB
dB
dB
MHz
MHz
Test Conditions/Comments
fIN = 1 kHz sine wave
fA = 5.4 kHz, fB = 4.6 kHz
fIN = 10 kHz
At 3 dB
At 0.1 dB
12
Bits
±0.5 ±1
LSB
±0.5 ±0.99
LSB
Guaranteed no missing codes to 12 bits
±2 ±4.5
LSB
±2.5 ±4.5
LSB
4
ppm/°C
±1 ±4
LSB
±1 ±2.5
LSB
0.5
ppm/°C
0
VREF
V
±0.01 ±1
µA
34
pF
When in track
8
pF
When in hold
2.4925
1
2.5
150
50
±0.01
1
12
60
2.5075
2.5
±1
35
V
ppm
ppm
V
µA
ppm/°C
µV rms
±0.3% maximum at 25°C
For 1000 hours
External reference applied to Pin VREF
Bandwidth = 10 MHz
0.7 × VDRIVE
V
0.3 × VDRIVE V
±0.01 ±1
µA
6
pF
0.1 × VDRIVE
V
VIN = 0 V or VDRIVE
Rev. 0 | Page 3 of 8







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