Analog Devices Inc. AD7988-1BCPZ-RL

Overview

AD7988-1BCPZ-RL from Analog Devices is a 16-bit, pseudo-differential successive approximation register (SAR) analog-to-digital converter optimized for low-power, high-precision data acquisition in space- and power-constrained systems. It delivers 100 kSPS throughput, ±1.25 LSB max INL, 91.5 dB SNR at 10 kHz with 5 V reference, and operates from a single 2.5 V supply with 1.8 V–5 V logic interface - enabling use in portable medical sensors and industrial loop-powered transmitters.

For engineers reviewing the AD7988-1BCPZ-RL datasheet, AD7988-1BCPZ-RL pinout, AD7988-1BCPZ-RL application, or AD7988-1BCPZ-RL equivalent, key selection criteria include its zero-latency architecture, 700 µW total power at 100 kSPS, 10-lead LFCSP package with exposed pad, −40°C to +125°C operation, and SPI-/QSPI™-/MICROWIRE™-compatible serial interface supporting daisy-chain mode.

Technical Context

The AD7988-1BCPZ-RL implements a true SAR conversion architecture with no pipeline delay, sampling on the rising edge of CNV and delivering conversion results immediately after completion. Its pseudo-differential input accepts 0 V to VREF (2.5 V–5.0 V) on IN+ relative to IN−, which serves as ground sense - not a true differential pair. The internal reference buffer supports up to 250 µA load current, and aperture delay is fixed at 2.0 ns.

Digital interface flexibility is achieved via dual-mode operation: CS mode (SDI high at CNV edge) enables standard 3- or 4-wire SPI, while chain mode (SDI low at CNV edge) allows daisy-chaining multiple ADCs on one SDO line with 16-cycle latency. VIO powers the digital I/O independently, supporting mixed-voltage host systems without level shifters.

Key Specifications

Pinout & Package

AD7988-1BCPZ-RL is housed in a 10-lead, 3 mm × 3 mm LFCSP package (CP-10-9) with exposed thermal pad. This thermally enhanced leadframe chip-scale package achieves θ_JA = 80°C/W and θ_JC = 15°C/W, enabling stable performance in compact, unventilated enclosures.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with AD7988-5BCPZ-RL and AD7687BRMZ-RL7, the AD7988-1BCPZ-RL uniquely balances sub-mW power, 100 kSPS throughput, and dual-voltage I/O - making it optimal for battery-operated, thermally constrained, or multi-supply embedded systems where every microwatt and millimeter matters.

Availability

AD7988-1BCPZ-RL is available at Aetrix Electronics and suitable for automated test equipment, portable medical instruments, and machine automation systems requiring stable component supply across long production lifecycles.

Supply support for AD7988-1BCPZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7988 family was designed specifically for low-power, high-accuracy data acquisition in space-constrained industrial, medical, and test equipment - emphasizing zero-latency sampling, flexible digital interfacing, and extended temperature operation.

FAQ

What is the maximum sampling rate supported by the AD7988-1BCPZ-RL?

The AD7988-1BCPZ-RL supports a maximum throughput of 100 kSPS. This is confirmed in the Rev. H datasheet Table 2, where "AD7988-1 Conversion Rate" is specified as 0 to 100 kSPS. At this rate, the total power dissipation is 700 µW, and conversion time (t_CONV) is 9.5 µs from CNV rising edge to valid data on SDO. Higher rates require the AD7988-5BCPZ-RL variant.

Does the AD7988-1BCPZ-RL require an external reference voltage?

Yes, the AD7988-1BCPZ-RL requires an external reference voltage applied to the REF pin. The datasheet specifies a 2.4 V to 5.1 V range, with optimal SNR and INL achieved at 5.0 V. The device does not include an internal reference; REF must be sourced from a low-noise, stable external reference IC or precision voltage divider, decoupled with a 10 µF capacitor to GND as shown in Figure 1 and Table 7.

What package type is used for the AD7988-1BCPZ-RL?

The AD7988-1BCPZ-RL uses a 10-lead, 3 mm × 3 mm LFCSP package (CP-10-9) with exposed thermal pad. This is explicitly stated in the "GENERAL DESCRIPTION" section and confirmed in Figure 4 and Table 6 of the Rev. H datasheet. The "BCPZ" suffix denotes the LFCSP package, distinguishing it from the MSOP variant (e.g., AD7988-1BRMZ). Thermal resistance is θ_JA = 80°C/W.

Can the AD7988-1BCPZ-RL interface directly with a 1.8 V microcontroller?

Yes, the AD7988-1BCPZ-RL can interface directly with a 1.8 V microcontroller via its dedicated VIO pin. As specified in Table 3 and Table 5, VIO accepts 1.71 V to 5.5 V, and digital input thresholds scale accordingly (e.g., VIL = 0.1 × VIO, VIH = 0.9 × VIO at ≤3 V). No level-shifting circuitry is needed - the AD7988-1BCPZ-RL adapts its logic levels to match the host's I/O voltage.

What is the meaning of the "-RL" suffix in AD7988-1BCPZ-RL?

The "-RL" suffix in AD7988-1BCPZ-RL indicates tape-and-reel packaging for automated surface-mount assembly. Per the Analog Devices Ordering Guide (Page 24, Rev. H), "RL" denotes 2500-piece reel quantity, while "R2" would indicate 5000-piece reel. This packaging format ensures consistent feeding in pick-and-place machines and is standard for high-volume production use of the AD7988-1BCPZ-RL.