ADI’s AD7770 is an 8-channel, simultaneous sampling ADC. Eight full sigma-delta (Σ-Δ) ADCs are on chip. The device provides a low input current to allow direct sensor connection. Each input channel has a programmable gain stage allowing gains of 1, 2, 4, and 8 to map lower amplitude sensor outputs into the full-scale ADC input range, maximizing the dynamic range of the signal chain. The AD7770 accepts a VREF voltage from 1 V up to 3.6 V. The analog inputs accept unipolar (0 V to VREF) or true bipolar (±VREF/2) analog input signals with 3.3 V or ±1.65 V analog supply voltages, respectively, for PGAGAIN = 1. The analog inputs can accept true differential, pseudo differential, or single-ended signals to match different sensor output configurations.
The AD7770 offers two modes of operation: high-resolution mode and low power mode. High-resolution mode provides a higher dynamic range while consuming 10.75 mW per channel; low power mode consumes just 3.37 mW per channel at a reduced dynamic range specification. This device comes in a 64-lead LFCSP package and was designed for general-purpose data acquisition applications.
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- Number of bits: 24 simultaneous sampling
- Single-ended or true differential inputs
- Programmable gain (PGA) per channel
- Sampling rate (per second): 32 k
- Number of inputs: 8
- Architecture: sigma-delta
- Operating temperature: -40°C to +125°C
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- Reference type: external, internal
- Two power modes:
- High resolution mode
- Low resolution mode
- Voltage supply analog: 2.2 V to 3.6 V
- PGA, simultaneous sampling
- Package/case: 64-WFQFN, 64-LFCSP (9 mm x 9 mm)
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| Applications |
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- Protection relays
- General-purpose data acquisition
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- Industrial process control
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ADI’s AD7770 is an 8-channel, simultaneous sampling ADC. Eight full sigma-delta (Σ-Δ) ADCs are on chip. The device provides a low input current to allow direct sensor connection. Each input channel has a programmable gain stage allowing gains of 1, 2, 4, and 8 to map lower amplitude sensor outputs into the full-scale ADC input range, maximizing the dynamic range of the signal chain. The AD7770 accepts a VREF voltage from 1 V up to 3.6 V. The analog inputs accept unipolar (0 V to VREF) or true bipolar (±VREF/2) analog input signals with 3.3 V or ±1.65 V analog supply voltages, respectively, for PGAGAIN = 1. The analog inputs can accept true differential, pseudo differential, or single-ended signals to match different sensor output configurations.
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