AD1981AJST-REEL

$5.06

Description：IC CODEC STEREO MICPREAMP 48LQFP
Series：SoundMAX®

SKU:b3b213e9a69b Category: CODECS Brand: Analog Devices Inc.

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Product introduction

Product Detailed Parameters

Description：IC CODEC STEREO MICPREAMP 48LQFP
Series：SoundMAX®
Mfr：Analog Devices Inc.
Package：Bulk
Type：Audio Codec '97
Data Interface：Serial
Resolution (Bits)：16, 20 b
Sigma Delta：No
S/N Ratio, ADCs / DACs (db) Typ：-
Dynamic Range, ADCs / DACs (db) Typ：85 / 90
Voltage - Supply, Analog：4.65V ~ 5.25V
Voltage - Supply, Digital：3.15V ~ 3.45V
Operating Temperature：0°C ~ 70°C
Mounting Type：Surface Mount
Package / Case：48-LQFP
Supplier Device Package：48-LQFP (7x7)
Grade：-
Qualification：-

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AD1981AJST-REEL

Overview

The AD1981AJST-REEL is an AC '97 2.2-compliant stereo codec in a 48-lead LQFP package. It features a 20-bit DAC with 90 dB dynamic range and a 16-bit ADC with 85 dB dynamic range. The device supports full-duplex operation with variable sample rates from 7040 Hz to 48 kHz. It includes integrated stereo headphone amplifiers, S/PDIF output, and multiple analog inputs including LINE-IN, AUX, CD, PHONE_IN, and MIC_IN. Power supplies are split into 3.3 V digital and 5 V analog domains.

Feature Summary

Integrated stereo headphone amplifier with jack sense pins for automatic output switching
Built-in digital equalizer function for optimized speaker sound
External audio power-down control via EAPD pin
Variable sample rate audio support with 1 Hz resolution

Applications

AC '97 compliant motherboard audio subsystems
Desktop PC multimedia audio processing
Telephony subsystem speakerphone integration

Procurement Notes

Verify the component matches the AD1981AJST-REEL designation exactly. Confirm the package type is 48-Lead LQFP (ST-48). Ensure the temperature range is 0 °C to 70°C. Check for physical damage or corrosion on the leads before installation. Validate that the supplier provides traceable documentation for this specific Analog Devices part number.

Selection Notes

Select this component when an AC '97 interface is required for legacy system designs. It is suitable for applications needing integrated headphone driving capabilities without external amplifiers. Consider the split power supply requirements of 3.3 V and 5 V during board layout. Verify that the host controller supports the necessary AC '97 register configuration for variable sample rates and EQ functions.

Part Context

The AD1981A is part of Analog Devices' SoundMAX codec family designed for AC '97 standards. It serves as a bridge between digital audio sources and analog output stages in personal computers. The JST suffix indicates the 48-lead LQFP package option. This model integrates both analog-to-digital and digital-to-analog conversion within a single chip.