AD7770

Data Sheet FEATURES 8-channel, 24-bit simultaneous sampling analog-to-digital converter (ADC) Single-ended or true differential inputs Programmable gain amplifier (PGA) per channel (gains of 1, 2, 4, and 8) Low dc input current ±4 nA (differential) and ±8 nA (single-ended) Up to 32 kSPS output data rate (ODR) per channel Programmable ODRs and bandwidth Sample rate converter (SRC) for coherent sampling Sampling rate resolution up to 15.2 × 10−6 SPS Low latency sinc3 filter path Adjustable phase synchronization Internal 2.5 V reference Two power modes optimizing power dissipation and performance: high resolution mode and low power mode Low resolution successive approximation register (SAR) ADC for system and chip diagnostics Power supply Bipolar (±1.65 V) or unipolar (3.3 V) supplies Digital input/output (I/O) supply: 1.8 V to 3.6 V Performance temperature range: −40°C to +105°C Functional temperature range: −40°C to +125°C Performance Combined ac and dc performance 103 dB dynamic range at 32 kSPS in high resolution mode −109 dB total harmonic distortion (THD) ±9 ppm of FSR integral nonlinearity (INL) ±15 µV offset error ±0.1% FS gain error ±10 ppm/°C typical temperature coefficient APPLICATIONS Protection relays General-purpose data acquisition Industrial process control GENERAL DESCRIPTION The AD7770 is an 8-channel, simultaneous sampling ADC. Eight full sigma-delta (Σ-Δ) ADCs are on chip. The AD7770 provides a low input current to allow direct sensor connection. Each input c...