Analog Devices Inc. AD7898AR-10REEL7

Overview

AD7898AR-10REEL7 from Analog Devices is a 12-bit successive approximation ADC with 220 kSPS throughput, ±10 V bipolar input range, single 5 V supply operation, and integrated track/hold amplifier - designed for precision data acquisition in industrial instrumentation and motor control systems.

For engineers reviewing the AD7898AR-10REEL7 datasheet, AD7898AR-10REEL7 pinout, AD7898AR-10REEL7 application, or AD7898AR-10REEL7 equivalent, this page delivers verified specifications, SOIC-8 package mapping, Mode 0/Mode 1 serial interface timing, power-down capability in Mode 1, and real-world dynamic performance (71 dB SNR, ±1 LSB relative accuracy).

Technical Context

The AD7898AR-10REEL7 implements a laser-trimmed internal oscillator for Mode 0 (CONVST-triggered, 3.3 µs conversion) and supports external SCLK-synchronized conversion in Mode 1 (16-cycle serial read, 4.33 µs min conversion). Its on-chip track/hold accepts ±10 V inputs with 24 kΩ minimum input resistance and 3.6 MHz full-power bandwidth at 1 dB.

It uses two's complement output coding, features VDRIVE pin for independent 2.7–5.25 V logic-level interfacing, and includes proprietary power-down mode (20 µA max IDD in temperature range) - enabling direct connection to 3 V microprocessors without level shifters.

Key Specifications

Pinout & Package

AD7898AR-10REEL7 is housed in an 8-lead SOIC (R-8) package with gull-wing leads, 1.27 mm pitch, and standard JEDEC MS-012AC footprint. Pin 1 is marked by a beveled corner or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7490BRUZ and ADS7822U, AD7898AR-10REEL7 uniquely combines ±10 V input capability, VDRIVE logic-level flexibility, and integrated track/hold in an 8-pin SOIC - eliminating external scaling, reference, and level-shifting components required by alternatives.

Availability

AD7898AR-10REEL7 is available at Aetrix Electronics and suitable for industrial process monitoring, motor control feedback loops, portable data loggers, and test equipment requiring stable component supply and long-term lifecycle support.

Supply support for AD7898AR-10REEL7 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 AD7898 product line was engineered for compact, low-power, high-accuracy data acquisition in space-constrained industrial and portable systems - emphasizing integration of track/hold, reference buffering, and flexible serial interface in minimal pin count.

FAQ

What is the input voltage range supported by the AD7898AR-10REEL7?

The AD7898AR-10REEL7 supports a ±10 V bipolar analog input range, optimized for industrial sensor interfaces such as 4–20 mA transmitters and strain gauge amplifiers. This range is fixed for the "-10" variant and does not require external scaling resistors. Input resistance is specified at ≥24 kΩ, and the on-chip track/hold maintains accuracy up to 3.6 MHz full-power bandwidth.

Does the AD7898AR-10REEL7 require an external voltage reference?

Yes, the AD7898AR-10REEL7 requires an external 2.5 V ±5% reference applied to the REF IN pin. The device includes an on-chip buffer for this input, and a 0.1 µF decoupling capacitor is mandatory per the datasheet. The reference directly sets the full-scale range: ±10 V corresponds to 2.5 V REF IN, yielding 4.88 mV per LSB.

How does the VDRIVE pin function in the AD7898AR-10REEL7?

The VDRIVE pin on the AD7898AR-10REEL7 sets the logic voltage level for SDATA, SCLK, and CS/CONVST pins independently of VDD. It accepts 2.7–5.25 V, enabling direct interfacing with 3 V microcontrollers while VDD remains at 5 V. This eliminates external level shifters and ensures compatible VIH/VIL thresholds - for example, VIH = VDRIVE × 0.7 min.

What are the key differences between Mode 0 and Mode 1 operation of the AD7898AR-10REEL7?

In Mode 0, conversion is initiated by a falling edge on CS/CONVST and controlled by an internal oscillator (3.3 µs conversion time); data is read after conversion completes. In Mode 1, SCLK drives both conversion timing and serial read (16 cycles, 4.33 µs min); it also enables power-down mode. Mode 1 supports higher system-level timing control and lower standby current (20 µA max).

Is the AD7898AR-10REEL7 RoHS compliant and lead-free?

Yes, the AD7898AR-10REEL7 is RoHS compliant and lead-free. The "R" in the part number denotes SOIC packaging, and the "REEL7" suffix indicates tape-and-reel packaging per EIA-481-D standards. Analog Devices confirms Pb-free construction for this variant, with JEDEC-standard solder profile compatibility and full compliance documentation available upon request.