4-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with PGA and Reference AD7124-4 Data Sheet
●GENERAL DESCRIPTION
■The AD7124-4 is a low power, low noise, completely integrated analog front end for high precision measurement applications.The device contains a low noise,24-bit Σ-Δ analog-to-digital converter (ADC),and can be configured to have four differential inputs or seven single-ended or pseudo differential inputs.The on-chip low gain stage ensures that signals of small amplitude can be interfaced directly to the ADC.
■One of the major advantages of the AD7124-4 is that it gives the user the flexibility to employ one of three integrated power modes.The current consumption,range of output data rates,and rms noise can be tailored with the power mode selected.The device also offers a multitude of filter options, ensuring that the user has the highest degree of flexibility.
■The AD7124-4 can achieve simultaneous 50 Hz and 60 Hz rejection when operating at an output data rate of 25 SPS (single cycle settling), with rejection in excess of 80 dB achieved at lower output data rates.
■The AD7124-4 establishes the highest degree of signal chain integration. The device contains a precision, low noise, low drift internal band gap reference, and also accepts an external differential reference, which can be internally buffered. Other key integrated features include programmable low drift excitation current sources, burnout currents,and a bias voltage generator,which sets the common-mode voltage of a channel to AVDD/2. The low-side power switch enables the user to power down bridge sensors between conversions, ensuring the absolute minimal power consumption of the system. The device also allows the user the option of operating with either an internal clock or an external clock.
■The integrated channel sequencer allows several channels to be enabled simultaneously, and the AD7124-4 sequentially converts on each enabled channel, simplifying communication with the device.As many as 16 channels can be enabled at any time;a channel being defined as an analog input or a diagnostic such as a power supply check or a reference check.This unique feature allows diagnostics to be interleaved with conversions.The AD7124-4 also supports per channel configuration.The device allows eight configurations or setups.Each configuration consists of gain,filter type,output data rate,buffering,and reference source.The user can assign any of these setups on a channel by channel basis.
●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 10 ppm/°C drift maximum (70 μA)
■Matched programmable excitation currents
■Internal clock oscillator
■On-chip bias voltage generator
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AD7124-4 、 AD7124-4 B grade 、 AD7124-8 、 AD7124-4BCPZ 、 AD7124-4BCPZ-RL 、 AD7124-4BCPZ-RL7 、 AD7124-4BBCPZ 、 AD7124-4BBCPZ-RL 、 AD7124-4BBCPZ-RL7 、 AD7124-4BRUZ 、 AD7124-4BRUZ-RL 、 AD7124-4BRUZ-RL7 、 EVAL-AD7124-4SDZ 、 EVAL-SDP-CB1Z 、 ADR4525 、 ADP162 |
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[ Temperature measurement ][ Pressure measurement ][ Industrial process control ][ Instrumentation ][ Smart transmitters ] |
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Datasheet |
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Please see the document for details |
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LFCSP;TSSOP |
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English Chinese Chinese and English Japanese |
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6/2018 |
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Rev.D |
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D13197-0-6/18(D) |
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5.1 MB |
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