4-Channel, 4.8 kHz, Ultralow Noise,
24-Bit Sigma-Delta ADC with PGA
Data Sheet
AD7193
Rev. E Document Feedback
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FEATURES
Fast settling filter option
4 differential/8 pseudo differential input channels
RMS noise: 11 nV @ 4.7 Hz (gain = 128)
15.5 noise-free bits @ 2.4 kHz (gain = 128)
Up to 22 noise-free bits (gain = 1)
Offset drift: ±5 nV/°C
Gain drift: ±1 ppm/°C
Specified drift over time
Automatic channel sequencer
Programmable gain (1 to 128)
Output data rate: 4.7 Hz to 4.8 kHz
Internal or external clock
Simultaneous 50 Hz/60 Hz rejection
4 general-purpose digital outputs
Power supply
AV
DD
: 3 V to 5.25 V
DV
DD
: 2.7 V to 5.25 V
Current: 4.65 mA
Temperature range: −40°C to +105°C
28-lead TSSOP and 32-lead LFCSP packages
Interface
3-wire serial
SPI, QSPIâ„¢, MICROWIREâ„¢, and DSP compatible
Schmitt trigger on SCLK
APPLICATIONS
PLC/DCS analog input modules
Data acquisition
Strain gage transducers
Pressure measurement
Temperature measurement
Flow measurement
Weigh scales
Chromatography
Medical and scientific instrumentation
GENERAL DESCRIPTION
The AD7193 is a low noise, complete analog front end for high
precision measurement applications. It contains a low noise,
24-bit sigma-delta (Σ-Δ) analog-to-digital converter (ADC).
The on-chip low noise gain stage means that signals of small
amplitude can interface directly to the ADC.
The device can be configured to have four differential inputs or
eight pseudo differential inputs. The on-chip channel sequencer
allows several channels to be enabled simultaneously, and the
AD7193 sequentially converts on each enabled channel, simplifying
communication with the part. The on-chip 4.92 MHz clock can
be used as the clock source to the ADC or, alternatively, an external
clock or crystal can be used. The output data rate from the part
can be varied from 4.7 Hz to 4.8 kHz.
The device has a very flexible digital filter, including a fast
settling option. Variables such as output data rate and settling
time are dependent on the option selected. The AD7193 also
includes a zero latency option.
The part operates with a power supply from 3 V to 5.25 V. It
consumes a current of 4.65 mA, and it is available in a 28-lead
TSSOP package and a 32-lead LFCSP package.
FUNCTIONAL BLOCK DIAGRAM
MCLK1 MCLK2 P0/REFIN2(–) P1/REFIN2(+)
DV
DD
DGND REFIN1(+) REFIN1(–)
AIN1
AIN2
AIN3
AIN4
AINCOM
BPDSW
AGND
AD7193
SERIAL
INTERFACE
AND
CONTROL
LOGIC
TEMP
SENSOR
CLOCK
CIRCUITRY
DOUT/RDY
DIN
SCLK
CS
SYNC
P3
P2
AV
DD
AGND
AIN5
AIN6
AIN7
AIN8
Σ-Δ
ADC
PGA
MUX
08367-001
Figure 1.
AD7193 Data Sheet
Rev. E | Page 2 of 56
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 3
Specifications ..................................................................................... 4
Timing Characteristics ................................................................ 8
Absolute Maximum Ratings .......................................................... 10
Thermal Resistance .................................................................... 10
ESD Caution ................................................................................ 10
Pin Configurations and Function Descriptions ......................... 11
Typical Performance Characteristics ........................................... 15
RMS Noise and Resolution............................................................ 18
Sinc
4
Chop Disabled ................................................................... 18
Sinc
3
Chop Disabled ................................................................... 19
Fast Settling ................................................................................. 20
On-Chip Registers .......................................................................... 21
Communications Register ......................................................... 22
Status Register ............................................................................. 23
Mode Register ............................................................................. 24
Configuration Register .............................................................. 27
Data Register ............................................................................... 29
ID Register ................................................................................... 29
GPOCON Register ..................................................................... 29
Offset Register ............................................................................. 30
Full-Scale Register ...................................................................... 30
ADC Circuit Information .............................................................. 31
Overview ...................................................................................... 31
Analog Input Channel ............................................................... 32
Programmable Gain Array (PGA) ........................................... 32
Reference ..................................................................................... 32
Reference Detect ......................................................................... 33
Bipolar/Unipolar Configuration .............................................. 33
Data Output Coding .................................................................. 33
Burnout Currents ....................................................................... 33
Channel Sequencer .................................................................... 33
Digital Interface .......................................................................... 34
Reset ............................................................................................. 38
System Synchronization ............................................................ 38
Enable Parity ............................................................................... 38
Clock ............................................................................................ 38
Bridge Power-Down Switch ...................................................... 38
Temperature Sensor ................................................................... 39
Logic Outputs ............................................................................. 39
Calibration................................................................................... 39
Digital Filter .................................................................................... 41
Sinc
4
Filter (Chop Disabled) ..................................................... 41
Sinc
3
Filter (Chop Disabled) ..................................................... 43
Chop Enabled (Sinc
4
Filter) ...................................................... 45
Chop Enabled (Sinc
3
Filter) ...................................................... 47
Fast Settling Mode (Sinc
4
Filter) ............................................... 48
Fast Settling Mode (Sinc
3
Filter) ............................................... 50
Fast Settling Mode (Chop Enabled) ......................................... 51
Summary of Filter Options ....................................................... 52
Grounding and Layout .................................................................. 53
Applications Information .............................................................. 54
Flowmeter .................................................................................... 54
Outline Dimensions ....................................................................... 55
Ordering Guide .......................................................................... 55