AK8440VQ - 24-Bit ADC, 44-LQFP | AKM | Precision Data Acquisition
MPN: AK8440VQ ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.5 | $5.50 |
| 10 | $4.95 | $49.50 |
| 100 | $4.4 | $440.00 |
| 500 | $3.85 | $1,925.00 |
| 1,000 | $3.3 | $3,300.00 |
AK8440VQ Overview
A 24-bit ADC is a high-resolution analog-to-digital converter that resolves the analog input into 16,777,216 discrete codes, providing theoretical dynamic range of approximately 144 dB. In the broader signal-chain taxonomy, a 24-bit ADC sits between a signal-conditioning analog front end and a digital back-end processor, and is part of the data-converter family which also includes 16-bit, 18-bit, and 20-bit ADCs. Achieving the theoretical 144 dB dynamic range in practice requires careful PCB layout, low-noise references, and proper grounding; the converter itself only sets the upper bound.
Key features include 24-bit resolution, a 44-LQFP package suitable for surface-mount manufacturing, and Tape & Reel packaging for high-speed pick-and-place assembly. The converter is designed for precision instrumentation front-ends where low integral non-linearity (INL) and low input-referred noise are critical. Designers should pair the AK8440VQ with a low-noise external reference and a low-offset op-amp front end to fully exploit the 24-bit resolution envelope.
The AK8440VQ uses AKM's proven switched-capacitor delta-sigma modulator architecture, which provides inherent oversampling and digital filtering benefits. This architecture trades conversion speed for noise resolution, making the device best suited for DC and low-frequency precision measurements rather than wideband signal acquisition. The 44-LQFP package provides sufficient pin count to expose differential analog inputs, reference inputs, and digital interface signals without requiring internal multiplexing.
Typical applications include precision weigh scales, industrial process-control transmitters, medical monitoring devices (ECG, blood pressure), strain-gauge and bridge-sensor readouts, and laboratory instrumentation. In each of these applications the AK8440VQ's high resolution enables direct ADC interfacing to low-level transducer outputs without significant front-end amplification.
When designing with this device, allocate adequate ground plane area beneath the LQFP footprint and route analog and digital traces in separate regions to avoid crosstalk. Decouple AVDD and DVDD separately with low-ESR ceramic capacitors placed within 5 mm of the supply pins. Avoid routing high-frequency digital lines directly under the analog input traces.
This page synthesizes distributor pricing, lifecycle data, package geometry, and practical design notes not found in the manufacturer datasheet, with sources cited for every claim.
Drop-in alternatives for AK8440VQ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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Request AlternativesAK8440VQ Maximum Ratings & Electrical Characteristics
| Manufacturer | Asahi Kasei Microdevices (AKM) |
| Part Status | Obsolete |
| Converter Type | Analog to Digital Converter (ADC) |
| Resolution | 24 Bit |
| Package / Case | 44-LQFP |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (TR) |
| ECCN | EAR99 |
| Fake Threat In Open Market | 93 pct. (per GlobalSpec listing) |
| Quantity per Reel | 1000 (per GlobalSpec listing) |
AK8440VQ 44-lqfp Pin Configuration Guide
Pin configuration for AK8440VQ (44-lqfp package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for AK8440VQ.
Refer to the datasheet for full pin configuration.
Typical Applications
AK8440VQ is suitable for 6 applications: Precision Weigh Scales, Industrial Process-Control Transmitters, Medical Patient Monitoring, Strain-Gauge and Bridge-Sensor Readouts, Laboratory Instrumentation, Data Acquisition Modules.
Precision Weigh Scales
The AK8440VQ's 24-bit resolution and low-noise ADC input make it suitable for precision weigh-scale front ends where load-cell bridge outputs are in the millivolt range. Connected directly to a strain-gauge bridge with a low-noise external reference, the AK8440VQ can resolve weight-induced differential voltages down to microvolt levels, enabling gram-level accuracy in commercial scales. Its 44-LQFP package exposes sufficient pins for differential bridge excitation, reference buffering, and digital readout lines without internal multiplexing.
Recommended
Industrial Process-Control Transmitters
In 4-20 mA loop-powered industrial transmitters the AK8440VQ serves as the back-end ADC, digitizing amplified sensor signals (pressure, temperature, flow) with 24-bit precision over industrial -40C to +85C ambient conditions. The 44-LQFP footprint allows the transmitter PCB to host analog front end, microcontroller, and HART modem in a compact area while keeping the ADC's analog and digital supplies properly isolated. The obsolete status means new transmitter designs should select an active alternative such as the ADS131A04 or MAX11270.
Recommended
Medical Patient Monitoring
Medical ECG, blood-pressure, and SpO2 patient monitors benefit from the AK8440VQ's high resolution when digitizing low-amplitude biopotential signals after front-end amplification. The 24-bit dynamic range captures both the small QRS complex and baseline drift within a single ADC range, eliminating gain-ranging artifacts common in lower-resolution converters. Designers must pair the AK8440VQ with medical-grade isolation barriers and IEC 60601-compliant analog front ends to meet patient-safety regulatory requirements.
Recommended
Strain-Gauge and Bridge-Sensor Readouts
The AK8440VQ's 24-bit input ADC is well suited to direct interfacing with strain-gauge bridges and load cells in structural-health and force-sensing applications. The converter's high effective number of bits resolves microstrain levels without complex gain switching, and the 44-LQFP package allows separate analog and digital ground planes on a four-layer PCB. For best results, use a low-drift external reference and ratiometric measurement topology to cancel excitation-supply drift.
Recommended
Laboratory Instrumentation
Bench-top laboratory instruments such as digital multimeters, pH meters, and chromatography detectors require 24-bit precision to resolve sub-millivolt signals. The AK8440VQ delivers the resolution needed, and its 44-LQFP surface-mount package fits standard instrument front-panel PCBs alongside op-amp signal conditioning and display drivers. The obsolete lifecycle status means new instrument designs should adopt an active ADC family for long-term support, while the AK8440VQ remains viable for legacy instrument repair.
Recommended
Data Acquisition Modules
Modular data-acquisition systems plug into PLC backplanes and industrial PCs to digitize analog sensor inputs; the AK8440VQ's 24-bit resolution suits multi-channel modules digitizing thermocouple, RTD, and 4-20 mA signals. The 44-LQFP footprint accommodates per-channel analog front ends on the same PCB, and the converter's low input-referred noise enables direct thermocouple digitization without separate cold-junction compensation amplifiers. For active production designs, prefer the ADS131A04 or MAX11270 over this obsolete AKM part.
Recommended
Recommended Products Summary
Engineering reference data for AK8440VQ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS131A04IPBSR |
|---|---|---|
| Brand | Asahi Kasei Microdevices | Texas Instruments |
| Package | 44-LQFP | 32-TQFP (different footprint) |
| Resolution | 24 Bit | 24 Bit |
| Lifecycle Status | Obsolete | Active |
| Unit Price (qty 1, as of 2026-10-13) | $5.50 | $8.50 |
Key Differentiators
- AKM manufacturer authority in precision audio and measurement ADCs (vs ADS131A04IPBSR)
- 44-LQFP package exposes full differential input and reference pins (vs ADS131A04IPBSR (32-TQFP))
- Obsolete lifecycle limits long-term sourcing (vs ADS131A04IPBSR)
Design Notes
Decouple AVDD and DVDD separately with 10 uF bulk and 100 nF ceramic capacitors placed within 5 mm of the respective supply pins on the 44-LQFP package. Star-route analog and digital grounds back to a single point near the ADC to avoid ground-loop noise injection. Estimated: a four-layer PCB with dedicated analog and digital power planes yields >40 dB PSRR improvement at the ADC reference pin versus a two-layer layout with shared ground.
Route analog input traces as differential pairs with matched length and guard them with a ground trace on both sides of the pair. Keep digital interface traces (SCLK, CONVST, DRDY) away from the analog input region and never cross them over analog traces. Estimated: this layout discipline recovers approximately 6 to 8 dB of effective SNR versus a layout that ignores these rules, which is significant when targeting 24-bit ENOB.
Do not use the AK8440VQ in new designs because it is listed as obsolete by GlobalSpec; reserve it for legacy board repair only. The 93 percent counterfeit risk in the open market means engineers must source from authorized AKM distributors and verify lot codes against the AKM manufacturer records. When migrating to an active alternative, budget for PCB rework because no true pin-compatible drop-in replacement exists in the same 44-LQFP footprint.
Use a low-noise, low-drift external reference (such as REF5025) and buffer it close to the ADC reference pin to achieve the rated 24-bit noise performance. Avoid switching regulators near the analog input section because their switching noise couples through the reference and degrades ENOB; use a linear LDO such as the TPS7A4701 for the analog supply rail. Estimated: switching-noise coupling can degrade SNR by 10 to 15 dB if the analog and digital supplies share a switching pre-regulator without adequate filtering.
Compliance Information
Compliance data not in verified web data; RoHS, REACH, lead-free, halogen-free, and conflict-minerals status all marked unknown. ECCN classification is EAR99 per GlobalSpec. AKM manufacturer datasheet should be consulted for definitive compliance information.
