Analog Devices Inc. AD1986BSTZ

Overview

AD1986BSTZ from Analog Devices is an AC '97 2.3-compliant audio codec IC designed for PC motherboard and notebook audio subsystems. It integrates six 24-bit Σ-Δ DACs (5.1 surround), dual 20-bit Σ-Δ ADCs, S/PDIF output, integrated headphone amplifiers, and programmable gain amplifiers with up to 30 dB boost - enabling high-fidelity audio playback and recording in compact form factors.

For engineers reviewing the AD1986BSTZ datasheet, AD1986BSTZ pinout, AD1986BSTZ application, or AD1986BSTZ equivalent, key selection criteria include AC '97 2.3 interface compliance, 90+ dB dynamic range, jack-sense–enabled auto-topology switching, and support for variable sample rates from 7 kHz to 96 kHz with 1 Hz resolution.

Technical Context

The AD1986BSTZ implements a full AC '97 v2.3 digital audio controller interface with BIT_CLK (12.288 MHz), SYNC, SDATA_IN/OUT, and RESET signals. Its analog core features independent 24-bit DACs per channel (Front, Surround, Center/LFE) and dual 20-bit ADCs with programmable gain (0–30 dB), all referenced to AVDD (5.0 V or 3.3 V) and DVDD (3.3 V).

It embeds an integrated PLL for system clocking, three software-controllable VREF_OUT pins (for MIC_1/2, LINE_IN, C/LFE bias), and advanced jack sensing using two dedicated inputs (JACK_SENSE_A/B) to detect insertion on up to eight jacks - reducing external component count versus legacy codecs.

Key Specifications

Pinout & Package

AD1986BSTZ is housed in a 48-pin LQFP package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are fully defined per Analog Devices Rev. 0 datasheet, including dedicated analog/digital power domains (AVDD/AVSS, DVDD/DVSS), AC '97 interface signals, multi-role I/Os (e.g., SURR_OUT_L doubles as LINE_IN_R), and three independent VREF_OUT outputs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar audio codec applications.

Compared with AD1985BSTZ and ALC655-VD, AD1986BSTZ delivers higher-resolution conversion (24-bit DACs), expanded jack sensing (8 vs. 4), and integrated parametric EQ - making it suitable for premium audio subsystems where fidelity, flexibility, and integration density are critical.

Availability

AD1986BSTZ is available at Aetrix Electronics and suitable for desktop PC audio subsystems, notebook integrated sound, VoIP conference terminals, and industrial audio recording systems requiring stable component supply, long-lifecycle support, and AC '97 2.3 compliance.

Supply support for AD1986BSTZ 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 consumer markets since 1965.

The AD1986BSTZ belongs to Analog Devices' AC '97 audio codec product line, engineered specifically for PC platform audio integration with emphasis on reduced external component count, flexible jack topology, and high-fidelity multichannel conversion.

FAQ

What is the maximum supported sample rate for AD1986BSTZ?

The AD1986BSTZ supports a maximum sample rate of 96 kHz for double-rate audio operation, as specified in its enhanced features list and confirmed in Register 0x2C (Front DAC PCM Rate). This enables high-resolution playback and recording beyond standard CD quality (44.1 kHz), and the device maintains full 24-bit DAC resolution and ≥90 dB dynamic range at this rate. The AD1986BSTZ also supports variable rates from 7 kHz to 48 kHz in 1 Hz increments for VoIP and narrowband applications.

Does AD1986BSTZ support S/PDIF output, and what format does it use?

Yes, AD1986BSTZ provides a dedicated S/PDIF output on Pin 48 (S/PDIF_OUT), compliant with IEC 60958 consumer format. It transmits stereo PCM data with copy protection bits and audio category codes, controlled via Register 0x3A (SPDIF Control). The output is electrically compatible with standard coaxial or optical receivers and requires no external level-shifting circuitry when interfaced with 75 Ω transmission lines.

How many jacks can AD1986BSTZ monitor simultaneously using its jack sense feature?

The AD1986BSTZ supports jack presence detection on up to eight separate audio jacks using only two dedicated input pins: JACK_SENSE_A (Pin 16) and JACK_SENSE_B (Pin 17). This is achieved through a resistor-divider network and internal decoding logic described in Registers 0x72 and 0x78. Each pin monitors four jacks (0–3 and 4–7), enabling automatic topology switching and eliminating the need for one GPIO per jack - a key BOM and layout simplification over earlier codecs.

What are the power supply requirements for AD1986BSTZ?

AD1986BSTZ requires two independent supplies: AVDD = 4.5–5.5 V (typically 5.0 V ±10%) for the analog core including DACs, ADCs, and headphone drivers; and DVDD = 2.97–3.63 V (typically 3.3 V ±10%) for digital logic, AC '97 interface, and registers. AVSS and DVSS must be separately decoupled. Total quiescent power dissipation is 365 mW (analog) + 171.6 mW (digital) at full operation, with deep power-down modes reducing current to 0.05 mA on AVDD.

Can AD1986BSTZ drive headphones directly, and what is its output capability?

Yes, AD1986BSTZ integrates dual headphone amplifiers capable of directly driving 32 Ω loads. Pins HP_OUT_L (39) and HP_OUT_R (41) deliver full-scale output of 1 VRMS (2.83 V p-p) into 32 Ω with ≤−75 dB THD. These outputs operate independently from LINE_OUT pins (43/45), allowing simultaneous headphone and line-level output without muting or external switching. The amplifier design includes mute-click suppression (±5 mV transient) for artifact-free plug/unplug events.