Analog Devices Inc. AD7298-1BCPZ-RL

Overview

AD7298-1BCPZ-RL from Analog Devices is a 10-bit, 1 MSPS, 8-channel successive approximation ADC with integrated 2.5 V reference, channel sequencer, and SPI-compatible serial interface. It operates from a single 2.8–3.6 V supply, supports −40°C to +125°C industrial temperature range, and delivers 61.5 dB SINAD at 50 kHz input-ideal for high-speed sensor monitoring in process control systems.

For engineers reviewing the AD7298-1BCPZ-RL datasheet, AD7298-1BCPZ-RL pinout, AD7298-1BCPZ-RL application, or AD7298-1BCPZ-RL equivalent, key selection criteria include guaranteed no-missed-codes performance, channel-to-channel isolation of −90 dB, programmable sequencer for automated multi-channel acquisition, and dual-supply logic interface (VDRIVE = 1.65–3.6 V) enabling direct interfacing with 1.8 V or 3 V microcontrollers.

Technical Context

The AD7298-1BCPZ-RL implements a capacitive DAC-based SAR architecture with track-and-hold amplifier supporting >30 MHz full-power bandwidth. Its internal sequencer enables preprogrammed cycling across VIN0–VIN7 without host intervention, and conversion results are output as 14-bit frames (4-bit channel address + 10-bit data) on DOUT synchronized to SCLK falling edges.

Power management includes three operational states: normal mode (6.4 mA typical), partial power-down (3.3 mA), and full power-down (<10 µA). The device features internal power-on reset, VREF buffer with 12 ppm/°C tempco, and decoupling requirements specified per pin (e.g., 10 µF on VREF to GND1, 1 µF on DCAP to GND).

Key Specifications

Pinout & Package

AD7298-1BCPZ-RL is housed in a 20-lead 4 mm × 4 mm LFCSP package with exposed paddle (EPAD) requiring soldering to PCB ground for thermal and electrical integrity. Pin 1 is DOUT; pins 1–5 and 18–20 are analog inputs VIN3–VIN7 and VIN0–VIN2; pin 6 is GND1 (reference ground); pin 7 is VREF; pin 8 is DCAP (LDO decoupling); pin 9 is GND (digital/analog common); pin 10 is VDD; pin 11 is CS; pin 12 is NC; pin 13 is DIN; pin 14 is DOUT; pin 15 is SCLK; pin 16 is VDRIVE; pin 17 is PD/RST.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multichannel SAR ADC applications.

Compared with AD7298BCPZ-RL, AD7298-1BCPZ-RL provides integrated temperature sensing without sacrificing speed or accuracy; versus AD7091R-8BCPZ-RL, it trades 2 extra bits of resolution for built-in reference, lower system cost, and simplified layout-making it optimal for compact, thermally aware industrial data loggers.

Availability

AD7298-1BCPZ-RL is available at Aetrix Electronics and suitable for industrial process control, automotive engine management, telecom power monitoring, and portable medical diagnostics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7298-1BCPZ-RL 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, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD7298-1BCPZ-RL belongs to Analog Devices' precision SAR ADC product line, designed specifically for high-speed, multi-channel data acquisition in thermally demanding and space-constrained embedded systems.

FAQ

What is the maximum analog input frequency supported by the AD7298-1BCPZ-RL?

The AD7298-1BCPZ-RL features a full-power bandwidth of 30 MHz at 3 dB and 10 MHz at 0.1 dB, enabling accurate digitization of signals up to 10 MHz without significant amplitude loss. Its aperture jitter of 40 ps supports high-fidelity sampling of fast-rising waveforms, and the track-and-hold acquisition time of 100 ns ensures settling within ±1 LSB after full-scale step transitions.

Does the AD7298-1BCPZ-RL require external decoupling capacitors, and if so, where?

Yes, the AD7298-1BCPZ-RL requires specific decoupling: a 10 µF capacitor between VREF and GND1, a 10 µF + 100 nF pair between VDD and GND, and a 1 µF capacitor between DCAP and GND. These values are mandated in the datasheet to stabilize the internal LDO, reference buffer, and analog supply-omitting any compromises SNR, THD, and channel isolation performance.

Can the AD7298-1BCPZ-RL operate with an external reference, and what is the acceptable voltage range?

Yes, the AD7298-1BCPZ-RL supports external reference operation via the VREF pin when the EXT_REF bit in the control register is set. The valid external reference voltage range is 2.0 V to 2.5 V. Applying voltages outside this range may cause improper conversion or damage; the internal reference is enabled by default at power-up and must be explicitly disabled in software to use an external source.

How does the channel sequencer function in the AD7298-1BCPZ-RL, and how is it configured?

The AD7298-1BCPZ-RL's channel sequencer is programmed via the 16-bit control register to define a repeatable sequence of up to eight analog inputs (VIN0–VIN7). Once configured, each falling edge of CS automatically advances to the next channel in the sequence-enabling hands-off, deterministic multi-channel acquisition without host processor intervention or additional timing logic.

What is the power consumption of the AD7298-1BCPZ-RL in full power-down mode across its operating temperature range?

In full power-down mode, the AD7298-1BCPZ-RL draws ≤10 µA at −40°C to +25°C and ≤10 µA at −40°C to +125°C, as specified in the datasheet. This ultra-low quiescent current is achieved by asserting the PD/RST pin low for >100 ns, which disables all internal circuitry except the wake-up path-making it ideal for battery-powered applications requiring periodic wake-and-measure operation.