AD1555BPZ

ADC Single Delta-Sigma 256KSPS 24Bit Serial 28Pin PLCC

Product Details

The AD1555 is a complete sigma-delta modulator, combined with a programmable gain amplifier, intended for low frequency, high dynamic range measurement applications. The AD1555 outputs a ones-density bit stream proportional to the analog input. When used in conjunction with the AD1556 digital filter/decimator, the industry"s highest performance ADC at a bandwidth of 1+ kHz is realized.

The continuous-time analog modulator input architecture avoids the need for an external anti-alias filter. The programmable gain front end simplifies system design, extends the dynamic range, and reduces system board area. Low operating power and standby modes makes the AD1555 ideal for remote battery-powered data acquisition systems.

### Features and Benefits

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Fourth Order Σ-Δ Modulator

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Large Dynamic Range

116 dB Min, 120 dB Typical @ 1 ms

117 dB Typical @ 0.5 ms

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Low Input Noise: 80 nV rms @ 4 ms with Gain of 34,128

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Low Distortion: –111 dB Max, –120 dB Typical

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Low Intermodulation: 122 dB

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Sampling Rate at 256 kSPS

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Very High Jitter Tolerance

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No External Antialias Filter Required

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Programmable Gain Front End

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Input Range: ±2.25 V

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Robust Inputs

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Gain Settings: 1, 2.5, 8.5, 34, 128