AD4000BRMZ

模数转换器, 16 bit, 2 MSPS, 伪差分, Microwire, QSPI, SPI, 单, 1.71 V

Product Details

The AD4000 is a low noise, low power, high speed, 16-bit, 2 MSPS precision successive approximation register SAR analog-to-digital converter ADC. It incorporates ease of use features that lower the signal chain power, reduce signal chain complexity, and enable higher channel density. The high-Z mode, coupled with a long acquisition phase, eliminates the need for a dedicated high power, high speed ADC driver, thus broadening the range of low power precision amplifiers that can drive this ADC directly while still achieving optimum performance. The input span compression feature enables the ADC driver amplifier and the ADC to operate off common supply rails without the need for a negative supply while preserving the full ADC code range. The low serial peripheral interface SPI clock rate requirement reduces the digital input/output power consumption, broadens processor options, and simplifies the task of sending data across digital isolation.

Operating from a 1.8 V supply, the AD4000 samples an analog input IN+ between 0 V to VREF with respect to a ground sense IN− with VREF ranging from 2.4 V to 5.1 V. The AD4000 consumes only 14 mW at 2 MSPS with a minimum of 70 MHz SCK rate in turbo mode and achieves ±1.0 LSB INL maximum, no missing codes at 16 bits with 93 dB SNR. The reference voltage is applied externally and can be set independently of the supply voltage.

The SPI-compatible versatile serial interface features seven different modes including the ability, using the SDI input, to daisy-chain several ADCs on a single 3-wire bus and provides an optional busy indicator. The AD4000 is compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic, using the separate VIO supply.

The AD4000 is available in a 10-lead MSOP or a 10-lead LFCSP with operation specified from −40°C to +125°C. The device is pin compatible with the 18-bit, 2 MSPS AD4003.

**Applications**

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Automatic test equipment

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Machine automation

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Medical equipment

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Battery-powered equipment

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Precision data acquisition systems

### Features and Benefits

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Throughput: 2 MSPS maximum

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INL: ±1.0 LSB maximum

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Guaranteed 16-bit no missing codes

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Low power

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9.75 mW at 2 MSPS VDD only

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70 μW at 10 kSPS, 14 mW at 2 MSPS total

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SNR: 93 dB typical at 1 kHz, 90 dB typical at 100 kHz

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THD: −115 dB typical at 1 kHz, −95 dB typical at 100 kHz

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Ease of use features reduce system power and complexity

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Input overvoltage clamp circuit

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Reduced nonlinear input charge kickback

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High-Z mode

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Long acquisition phase

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Input span compression

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Fast conversion time allows low SPI clock rates

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SPI-programmable modes, read/write capability, status word

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Pseudo differential single-ended analog input range: 0 V to VREF with VREF between 2.4 V to 5.1 V

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Single 1.8 V supply operation with 1.71 V to 5.5 V logic interface

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SAR architecture: no latency/pipeline delay

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Guaranteed operation: −40°C to 125°C

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Serial interface SPI-/QSPI-/MICROWIRE-/DSP-compatible

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Ability to daisy-chain multiple ADCs and busy indicator

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10-lead package: 3 mm × 3 mm LFCSP and 3 mm × 4.90 mm MSOP