Analog Devices Inc. AD7707BRUZ

Overview

AD7707BRUZ from Analog Devices is a 3-channel, 16-bit sigma-delta ADC optimized for low-frequency precision measurement. It integrates programmable-gain amplification (gain 1–128), on-chip digital filtering, and dual-input-range support (±10 mV to ±2.5 V on low-level channels; ±10 V on high-level channel), enabling direct transducer interfacing in industrial sensor systems.

For engineers reviewing the AD7707BRUZ datasheet, AD7707BRUZ pinout, AD7707BRUZ application, or AD7707BRUZ equivalent, key selection criteria include its ±0.003% integral nonlinearity, 1 mW power dissipation at 3 V, true bipolar ±100 mV capability on AIN1/AIN2, SPI/QSPI/MICROWIRE-compatible 3-wire interface, and 20-lead TSSOP package compatibility with space-constrained instrumentation designs.

Technical Context

The AD7707BRUZ employs a charge-balancing sigma-delta modulator with on-chip digital filter whose first notch is software-programmable-enabling configurable output update rates and rejection of 50/60 Hz line interference. Its analog front end includes two pseudo-differential low-level inputs (AIN1, AIN2) and one single-ended high-level input (AIN3 referenced to HICOM), each with independent gain and polarity control via serial register writes.

Calibration is supported through both self-calibration (removing internal offset/gain errors) and system calibration (compensating for external sensor/PGA errors). The device operates from a single 2.7–3.3 V or 4.75–5.25 V supply, with standby current as low as 8 μA and power-down mode reducing consumption to 20 μW typical-making it suitable for battery-powered data loggers and portable test equipment.

Key Specifications

Pinout & Package

AD7707BRUZ is housed in a 20-lead TSSOP package (4.4 mm × 6.5 mm, 0.65 mm pitch), pin-compatible with the 20-lead SOIC variant (AD7707BN). The package supports surface-mount reflow and offers improved thermal performance over SOIC in compact layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar sigma-delta ADC applications.

Compared with AD7707BRUZ, AD7714BRUZ delivers higher resolution at the expense of power and high-voltage input capability, while ADS1248IPWR trades ±10 V support for integrated peripherals-making AD7707BRUZ uniquely balanced for mixed-range industrial sensing with minimal external components.

Availability

AD7707BRUZ is available at Aetrix Electronics and suitable for pressure measurement, thermocouple monitoring, and RTD signal conditioning requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial OEM programs.

Supply support for AD7707BRUZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7707BRUZ belongs to Analog Devices' precision sigma-delta ADC product line, designed specifically for low-frequency industrial measurement applications requiring high DC accuracy, low power, and integrated signal conditioning.

FAQ

What is the maximum input voltage range supported by AD7707BRUZ on its high-level channel?

The AD7707BRUZ supports ±10 V input range on its high-level analog input channel (AIN3), referenced to HICOM. This allows direct connection to industrial 0–10 V or ±10 V control signals without external attenuation or level-shifting circuitry. Input impedance is 27 kΩ minimum, and the channel maintains 78 dB normal-mode 50/60 Hz rejection when configured with appropriate filter notches.

Does AD7707BRUZ support true bipolar operation on its low-level input channels?

Yes, AD7707BRUZ supports true bipolar operation on AIN1 and AIN2 with ranges down to ±10 mV, including ±100 mV capability without requiring charge pumps. This is achieved via dedicated LCOM reference and internal PGA architecture-enabling direct connection to thermocouples or bridge transducers with bipolar output swing while maintaining ±0.003% integral nonlinearity.

What power supply configurations are valid for AD7707BRUZ operation?

AD7707BRUZ operates with AVDD = 2.7–3.3 V or 4.75–5.25 V, and DVDD = 2.7–5.25 V. AVDD and DVDD may be tied together or independently supplied. At 3 V, typical power dissipation is 0.84 mW (BUF = 0, fCLKIN = 1 MHz); standby current is 8 μA max. Separating AVDD/DVDD with proper grounding improves PSRR and noise immunity in mixed-signal systems.

How does the programmable digital filter in AD7707BRUZ improve noise rejection?

The AD7707BRUZ features a programmable first-notch digital filter that can be set to 10 Hz, 20 Hz, 25 Hz, 50 Hz, or 60 Hz-providing >98 dB normal-mode and >150 dB common-mode rejection at line frequencies. This eliminates need for external analog notch filters and enables robust operation in electrically noisy factory environments where 50/60 Hz interference would otherwise corrupt low-level sensor measurements.

Can AD7707BRUZ perform system-level calibration to correct for external component errors?

Yes, AD7707BRUZ supports system calibration to remove gain and offset errors introduced by external circuitry such as sensor bridges, excitation sources, or PCB traces. Using dedicated zero-scale and full-scale calibration registers, the device applies correction coefficients during conversion-enabling end-of-line calibration without trimming potentiometers or firmware compensation tables. System calibration is performed in under 100 ms per channel.