AD7770

RECOMMENDED FOR NEW DESIGNS

8-Channel, 24-Bit, 32 kSPS Simultaneous Sampling ADC

Analog Devices AD7770 Product Info

10 February 2026 5

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

Part details & applications

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 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 V_REF voltage from 1 V up to 3.6 V.

The analog inputs accept unipolar (0 V to V_REF) or true bipolar (±V_REF/2) analog input signals with 3.3 V or ±1.65 V analog supply voltages, respectively for PGA_GAIN = 1. The analog inputs can be configured to accept true differential, pseudo differential, or single-ended signals to match different sensor output configurations.

Each channel contains a PGA, an ADC modulator and a sinc3, low latency digital filter. An SRC is provided to allow fine resolution control over the AD7770 ODR. This control can be used in applications where the ODR resolution is required to maintain coherency with 0.01 Hz changes in the line frequency. The SRC is programmable through the serial port interface (SPI). The AD7770 implements two different interfaces: a data output interface and SPI control interface. The ADC data output interface is dedicated to transmitting the ADC conversion results from the AD7770 to the processor. The SPI writes to and reads from the AD7770 configuration registers and for the control and reading of data from the SAR ADC. The SPI can also be configured to output the Σ-Δ conversion data.

The AD7770 includes a 12-bit SAR ADC. This ADC can be used for AD7770 diagnostics without having to decommission one of the Σ-Δ ADC channels dedicated to system measurement functions. With the use of an external multiplexer, which can be controlled through the three general-purpose input/output pins (GPIOs), and signal conditioning, th

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