AD7124-4BRUZ

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1. DESCRIPTION

The AD7124-4BRUZ 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 AD7124-4BRUZ 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 AD7124-4BRUZ 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 AD7124-4BRUZ 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 AD7124-4BRUZ 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 AD7124-4BRUZ 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. The AD7124-4BRUZ also has extensive diagnostic functionality integrated as part of its comprehensive feature set. These diagnostics include a cyclic redundancy check (CRC), signal chain checks, and serial interface checks, which lead to a more robust solution. These diagnostics reduce the need for external components to implement diagnostics, resulting in reduced board space needs, reduced design cycle times, and cost savings. The failure modes effects and diagnostic analysis (FMEDA) of a typical application has shown a safe failure fraction (SFF) greater than 90% according to IEC 61508. The device operates with a single analog power supply from 2.7 V to 3.6 V or a dual 1.8 V power supply. The digital supply has a range of 1.65 V to 3.6 V. It is specified for a temperature range of −40°C to +125°C. The AD7124-4 is housed in a 32-lead LFCSP package and a 24-lead TSSOP package.

2. FEATURES

    1. 3 power modes

    2. 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)

    3. Up to 22 noise free bits in all power modes (gain = 1)

    4. 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

    5. Rail-to-rail analog inputs for gains > 1 

    6. Simultaneous 50 Hz/60 Hz rejection at 25 SPS (single cycle settling)

    7. Diagnostic functions 

    8. Crosspoint multiplexed analog inputs 4 differential/7 pseudo differential inputs

    9. Programmable gain (1 to 128)

  10. Band gap reference with 10 ppm/°C drift maximum (70 µA)

  11. Matched programmable excitation currents

  12. Internal clock oscillator

  13. On-chip bias voltage generator

  14. Low-side power switch

  15. General-purpose outputs

  16. Multiple filter options

  17. Internal temperature sensor

  18. Self and system calibration

  19. Sensor burnout detection

  20. Automatic channel sequencer

  21. Per channel configuration

  22. Power supply: 2.7 V to 3.6 V and ±1.8 V

  23. Independent interface power supply

  24. Power-down current: 5 µA maximum

  25. Temperature range: −40°C to +125°C

  26. 32-lead LFCSP/24-lead TSSOP

  27. 3-wire or 4-wire serial interface

        - SPI, QSPI, MICROWIRE, and DSP compatible 

        - Schmitt trigger on SCLK

  28. ESD: 4 kV

3. APPLICATIONS

    1. Temperature measurement

    2. Pressure measurement

    3. Industrial process control

    4. Instrumentation

    5. Smart transmitters