Analog Devices Inc. AD7707BRUZ-REEL7

Overview

AD7707BRUZ-REEL7 from Analog Devices is a 3-channel, 16-bit sigma-delta ADC with ±10 V high-level and ±10 mV low-level input capability, ±0.003% integral nonlinearity, 1 mW power dissipation at 3 V, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - used in precision industrial data acquisition systems for transducer signal conditioning and digitization.

For engineers reviewing the AD7707BRUZ-REEL7 datasheet, AD7707BRUZ-REEL7 pinout, AD7707BRUZ-REEL7 application, or AD7707BRUZ-REEL7 equivalent, key selection considerations include its dual-range analog input architecture (±10 V AIN3 + ±10 mV AIN1/AIN2), on-chip programmable gain amplifier (gain 1–128), self/system calibration support, and TSSOP-20 package compatibility with low-power embedded measurement designs.

Technical Context

The AD7707BRUZ-REEL7 employs a charge-balancing sigma-delta modulator with on-chip digital filtering whose first notch is software-programmable to adjust cutoff frequency and output update rate. It integrates a proprietary programmable gain front end (PGA) and supports both unipolar and bipolar input configurations via B/U bit control.

It features two pseudo-differential low-level inputs (AIN1, AIN2) with true bipolar ±100 mV capability and one high-level input (AIN3) referenced to HICOM, all sharing a common differential reference input (REF IN(±)). The device operates from single 2.7–3.3 V or 4.75–5.25 V supply and includes Schmitt-triggered SCLK for noise immunity.

Key Specifications

Pinout & Package

AD7707BRUZ-REEL7 is housed in a 20-lead TSSOP package (4.4 mm × 6.5 mm, 0.65 mm pitch), RoHS-compliant and tape-and-reel packaged per REEL7 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7707BRUZ-REEL7, AD7714BRUZ offers higher resolution but lacks native ±10 V input and consumes >3× more power, while ADS1258IPWR provides more channels but requires external components to match AD7707BRUZ-REEL7's integrated high-level input capability and low-noise low-level signal chain.

Availability

AD7707BRUZ-REEL7 is available at Aetrix Electronics and suitable for industrial process control, smart sensor modules, and portable instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.

Supply support for AD7707BRUZ-REEL7 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide.

The AD7707BRUZ-REEL7 belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for low-frequency industrial measurement applications demanding high DC accuracy, multi-range analog input flexibility, and low-power operation.

FAQ

What is the maximum input voltage range supported by AD7707BRUZ-REEL7 on its high-level input channel?

AD7707BRUZ-REEL7 supports ±10 V, ±5 V, 0 V to 10 V, and 0 V to 5 V on its AIN3 high-level input channel, enabled by on-chip thin-film resistors that eliminate need for external attenuators or split supplies. This range is specified with AVDD = 4.75–5.25 V and reference = 2.5 V, or AVDD = 2.7–3.3 V and reference = 1.225 V. Input impedance is 27 kΩ minimum.

Does AD7707BRUZ-REEL7 support true bipolar operation on its low-level input channels?

Yes, AD7707BRUZ-REEL7 supports true bipolar ±100 mV operation on AIN1 and AIN2 in unbuffered mode with gain = 16, as confirmed in the ±100 mV INPUT RANGE section of the datasheet. This capability allows direct connection to strain gages and other bipolar transducers without external level-shifting circuitry.

What is the power consumption of AD7707BRUZ-REEL7 during normal operation and standby mode?

AD7707BRUZ-REEL7 consumes up to 1.05 mW at 3 V with external 1 MHz MCLK and BUF = 0, and up to 2.04 mW with BUF = 1. In standby (power-down) mode, it draws ≤8 μA at 3 V (typically 4 μA) and ≤18 μA at 5 V (typically 9 μA), reducing power dissipation to ~20 μW typical - ideal for battery-operated field instruments.

How does the AD7707BRUZ-REEL7 handle 50 Hz/60 Hz line interference rejection?

AD7707BRUZ-REEL7 achieves >98 dB normal-mode and >150 dB common-mode rejection at 50 Hz/60 Hz through its programmable digital filter notch. Users select notch frequencies (e.g., 10 Hz, 25 Hz, 50 Hz, or 60 Hz) via on-chip control registers, enabling optimal rejection without external notch filters or synchronous sampling hardware.

Can AD7707BRUZ-REEL7 perform system calibration to compensate for external sensor errors?

Yes, AD7707BRUZ-REEL7 supports system calibration that corrects for gain and offset errors introduced by external components such as RTD excitation circuits, strain gage bridges, or signal conditioning stages. Calibration coefficients are stored internally and applied automatically during conversion, eliminating manual trimming and improving end-system accuracy.