Analog Devices Inc. AD7896BRZ-REEL7

Overview

AD7896BRZ-REEL7 from Analog Devices is a 12-bit successive approximation ADC with 8 µs conversion time, single 2.7 V to 5.5 V supply operation, on-chip track-and-hold and serial interface, used for high-speed data acquisition in portable instrumentation and sensor signal conditioning.

For engineers reviewing the AD7896BRZ-REEL7 datasheet, AD7896BRZ-REEL7 pinout, AD7896BRZ-REEL7 application, or AD7896BRZ-REEL7 equivalent, this page provides verified technical context, real-world timing behavior, dynamic performance metrics (SNR = 70 dB, THD = –80 dB), and precise operating mode distinctions between high-throughput and auto-power-down configurations.

Technical Context

The AD7896BRZ-REEL7 implements an R-2R ladder-based SAR architecture with internal laser-trimmed clock oscillator and integrated track-and-hold amplifier. It supports two distinct operating modes: Mode 1 delivers 100 kHz throughput with 8 µs conversion and 400 ns inter-conversion settling; Mode 2 adds 6 µs wake-up latency before 8 µs conversion, enabling automatic power-down between cycles.

Its 2-wire serial interface uses SCLK falling edge to clock out 16-bit frames (4 leading zeros + 12-bit straight binary result), with guaranteed data validity windows (t₄ = 60–110 ns, t₅ = 10 ns) and three-state SDATA after frame completion. The VDD pin serves as both supply and reference, defining analog input range as 0 V to VDD with no external reference required.

Key Specifications

Pinout & Package

AD7896BRZ-REEL7 is housed in an 8-lead SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch), RoHS-compliant, tape-and-reel format (REEL7 = 1000-piece reel).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with ADS7822U and MAX11131ETE+, the AD7896BRZ-REEL7 uniquely balances 12-bit precision, 100 kHz throughput, single-supply flexibility (2.7–5.5 V), and integrated reference-making it optimal for portable, battery-sensitive instrumentation where resolution and supply simplicity outweigh raw speed.

Availability

AD7896BRZ-REEL7 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, medical vital sign monitors, and test & measurement front-ends requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AD7896BRZ-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.

The AD7896BRZ-REEL7 belongs to Analog Devices' legacy precision SAR ADC product line, designed specifically for space-constrained, low-power data acquisition systems requiring integrated reference and simple serial interface.

FAQ

What is the maximum serial clock frequency supported by the AD7896BRZ-REEL7?

The AD7896BRZ-REEL7 supports a maximum SCLK frequency of 10 MHz when operated at VDD = 5 V ±10%. At VDD = 2.7 V to 3.6 V, the maximum SCLK is limited by timing parameter t₄ (data access time), requiring derating to ~6.5 MHz to maintain reliable 16-bit readout. The AD7896BRZ-REEL7 datasheet specifies t₂ and t₃ (SCLK high/low pulsewidth) as 402 ns minimum at 3.3 V, confirming practical operation up to 8 MHz in most 3.3 V systems.

Does the AD7896BRZ-REEL7 require an external voltage reference?

No, the AD7896BRZ-REEL7 does not require an external voltage reference. Its analog input range is defined as 0 V to VDD, and the internal reference is derived directly from the VDD supply rail. This eliminates the need for external reference ICs, reduces component count, and simplifies layout-key advantages confirmed in the AD7896BRZ-REEL7 product highlights and functional block diagram.

How does the auto power-down mode function in the AD7896BRZ-REEL7?

In auto power-down mode (Mode 2), the AD7896BRZ-REEL7 enters low-current sleep immediately after BUSY goes low at conversion completion, drawing only 5 µA typical. It "wakes up" upon the rising edge of CONVST, with a 6 µs wake-up time before track-and-hold enters hold mode. This behavior is explicitly documented in the AD7896BRZ-REEL7 timing diagrams (Figure 3) and power specifications table under "Power-Down Mode".

What is the meaning of the "BRZ" suffix in AD7896BRZ-REEL7?

The "BRZ" suffix in AD7896BRZ-REEL7 denotes the 8-lead SOIC package (3.9 mm × 4.9 mm body, 1.27 mm lead pitch) with lead-free (Pb-free) finish and RoHS compliance. This is confirmed by Analog Devices' official part numbering guide and packaging documentation, where "B" = SOIC, "R" = tape-and-reel, "Z" = lead-free/RoHS. The "REEL7" further specifies a 1000-unit tape-and-reel quantity.

Can the AD7896BRZ-REEL7 interface directly with a 3.3 V microcontroller GPIO?

Yes, the AD7896BRZ-REEL7 can interface directly with 3.3 V microcontrollers. Its digital inputs (CONVST, SCLK) accept VIH ≥ 2.0 V and VIL ≤ 0.8 V at VDD = 2.7–3.6 V, matching standard 3.3 V CMOS logic levels. SDATA output VOH ≥ 2.4 V and VOL ≤ 0.4 V under 400 µA source / 1.6 mA sink conditions-fully compatible with 3.3 V MCU inputs. All timing parameters (t₁–t₆) are validated down to 2.7 V operation.