AD7760: 2.5 MSPS, 24-Bit, 100 dB Sigma-Delta ADC with On-Chip Buffer
The AD7760 is a high performance, 24-bit Σ-Δ analog-to-digital converter (ADC). It combines wide input bandwidth and high speed with the benefits of Σ-Δ conversion to achieve a performance of 100 dB ...More
Find out how to optimize the performance of the AD7760 by viewing AD7760 : Tips & Solutions to Aid Optimum Performance
AD7760: 2.5 MSPS, 24-Bit, 100 dB Sigma-Delta ADC with On-Chip Buffer
Product Description
The AD7760 is a high performance, 24-bit Σ-Δ analog-to-digital converter (ADC). It combines wide input bandwidth and high speed with the benefits of Σ-Δ conversion to achieve a performance of 100 dB SNR at 2.5 MSPS, making it ideal for high speed data acquisition. Wide dynamic range combined with significantly reduced antialiasing requirements simplify the design process. An integrated buffer to drive the reference, a differential amplifier for signal buffering and level shifting, an overrange flag, internal gain and offset registers, and a low-pass digital FIR filter make the AD7760 a compact, highly integrated data acquisition device requiring minimal peripheral component selection. In addition, the device offers programmable decimation rates, and the digital FIR filter can be adjusted if the default characteristics are not appropriate for the application. The AD7760 is ideal for applications demanding high SNR without a complex front-end signal processing design.
The differential input is sampled at up to 40 MSPS by an analog modulator. The modulator output is processed by a series of low-pass filters, with the final filter having default or user-programmable coefficients. The sample rate, filter corner frequencies, and output word rate are set by a combination of the external clock frequency and the configuration registers of the AD7760.
The reference voltage supplied to the AD7760 determines the analog input range. With a 4 V reference, the analog input range is ±3.2 V differential biased around a common mode of 2 V. This common-mode biasing can be achieved using the on-chip differential amplifier, further reducing the external signal conditioning requirements.
The AD7760 is available in an exposed paddle, 64-lead TQFP and is specified over the industrial temperature range from −40°C to +85°C.
Applications
- Data acquisition systems
- Vibration analysis
- Instrumentation
- Data Sheet Rev A, 08/2006 (pdf 912kB)
- (About Data Sheets)
Features
- 120 dB dynamic range at 78 kHz output data rate
- 100 dB dynamic range at 2.5 MHz output data rate
- 112 dB SNR at 78 kHz output data rate
- 100 dB SNR at 2.5 MHz output data rate
- 2.5 MHz maximum fully filtered output word rate
- Fully differential modulator input
- Programmable oversampling rate (8X to 256X)
- On-chip differential amplifier for signal buffering
- Low-pass finite impulse response (FIR) filter with default or user-programmable coefficients
- Modulator output mode
- Overrange alert bit
- Digital offset and gain correction registers
Diagrams
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- Other Diagrams
- Symbols and Footprints
Functional Block Diagram for AD7760
2.5 MSPS, 24-Bit, 100 dB Sigma-Delta ADC with On-Chip Buffer
Other Diagrams for AD7760
2.5 MSPS, 24-Bit, 100 dB Sigma-Delta ADC with On-Chip Buffer
AD7760 Pin Configuration
Functional Block Diagram for AD7760