herunterladen
4-Channel, Low Noise, Low Power, 24-Bit,
Sigma-Delta ADC with PGA and Reference
Data Sheet
AD7124-4
Rev. A Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2015 Analog Devices, Inc. All rights reserved.
Technical Support www.analog.com
FEATURES
3 power modes
RMS noise
Low power: 24 nV rms at 1.17 SPS, gain = 128 (255 µA typical)
Mid power: 20 nV rms at 2.34 SPS, gain = 128 (355 µA typical)
Full power: 23 nV rms at 9.4 SPS, gain = 128 (930 µA typical)
Up to 22 noise free bits in all power modes (gain = 1)
Output data rate
Full power: 9.38 SPS to 19,200 SPS
Mid power: 2.34 SPS to 4800 SPS
Low power: 1.17 SPS to 2400 SPS
Rail-to-rail analog inputs for gains > 1
Simultaneous 50 Hz/60 Hz rejection at 25 SPS (single cycle
settling)
Diagnostic functions (which aid safe integrity level (SIL)
certification)
Crosspoint multiplexed analog inputs
4 differential/7 pseudo differential inputs
Programmable gain (1 to 128)
Band gap reference with 15 ppm/°C drift maximum (65 µA)
Matched programmable excitation currents
Internal clock oscillator
On-chip bias voltage generator
Low-side power switch
General-purpose outputs
Multiple filter options
Internal temperature sensor
Self and system calibration
Sensor burnout detection
Automatic channel sequencer
Per channel configuration
Power supply: 2.7 V to 3.6 V and ±1.8 V
Independent interface power supply
Power-down current: 5 µA maximum
Temperature range: −40°C to +105°C
32-lead LFCSP/24-lead TSSOP
3-wire or 4-wire serial interface
SPI, QSPI, MICROWIRE, and DSP compatible
Schmitt trigger on SCLK
ESD: 4 kV
APPLICATIONS
Temperature measurement
Pressure measurement
Industrial process control
Instrumentation
Smart transmitters
FUNCTIONAL BLOCK DIAGRAM
Figure 1.
TEMPERATURE
SENSOR
BANDGAP
REF
V
BIAS
SERIAL
INTERFACE
AND
CONTROL
LOGIC
INTERNAL
CLOCK
CLK
SCLK
DIN
SYNC
REGCAPD
IOV
DD
AD7124-4
AV
SS
DGND
24-BIT
Σ-Δ ADC
X-MUX
REFIN1(+)
AV
DD
AV
SS
REFOUT
AV
DD
AV
SS
PSW
VARIABLE
DIGITAL
FILTER
DIAGNOSTICS
COMMUNICATIONS
POWER SUPPLY
SIGNAL CHAIN
DIGITAL
REFIN1(–)
REFIN2(+)
REFIN2(–)
BURNOUT
DETECT
EXCITATION
CURRENTS
POWER
SWITCH
GPOs
CHANNEL
SEQUENCER
CROSSPOINT
MUX
REGCAPAAV
DD
1.9V
LDO
DIAGNOSTICS
AV
DD
AV
SS
AV
SS
DOUT/RDY
CS
1.8V
LDO
ANALOG
BUFFERS
REFERENCE
BUFFERS
BUF
BUF
PGA2PGA1
AIN0/IOUT/VBIAS
AIN1/IOUT/VBIAS
AIN2/IOUT/VBIAS/P1
AIN3/IOUT/VBIAS/P2
AIN4/IOUT/VBIAS
AIN5/IOUT/VBIAS
AIN6/IOUT/VBIAS/REFIN2(+)
AIN7/IOUT/VBIAS/REFIN2(–)
13197-001
Verzeichnis
- ・ Konfiguration des Pinbelegungsdiagramms on Seite 14 Seite 90
- ・ Abmessungen des Paketumrisses on Seite 90
- ・ Teilenummerierungssystem on Seite 90
- ・ Blockdiagramm on Seite 1 Seite 36 Seite 71 Seite 73 Seite 75
- ・ Beschreibung der Funktionen on Seite 4 Seite 14 Seite 90
- ・ Technische Daten on Seite 1 Seite 5 Seite 13 Seite 37 Seite 45
- ・ Anwendungsbereich on Seite 1 Seite 71
- ・ Elektrische Spezifikation on Seite 17
