Analog Devices Inc. AD1893JN

Overview

AD1893JN from Analog Devices is a 16-bit stereo asynchronous sample rate converter (ASRC) designed for digital audio interfacing between mismatched sample clocks. It supports input/output sample rates from 8 kHz to 56 kHz (e.g., CD 44.1 kHz, DAT 48 kHz, broadcast 32 kHz), delivers –96 dB THD+N at 1 kHz, 96 dB dynamic range, and features automatic sample frequency sensing with no programming required. It operates from 2.7 V to 5.5 V and targets low-power portable audio systems.

For engineers reviewing the AD1893JN datasheet, AD1893JN pinout, AD1893JN application, or AD1893JN equivalent, key selection considerations include its 28-pin PDIP package, dual serial I/O interfaces with flexible data justification, slow/fast settling mode control via SETSLW, on-chip 16 MHz oscillator support, and real-time jitter rejection up to 10 ns without external PLLs.

Technical Context

The AD1893JN implements asynchronous conversion using a polyphase FIR filter bank with 65,536 equivalent subfilters, achieving 300 ps internal time resolution. Its digital servo control loop continuously computes the ratio between LR_I and LR_O clocks to drive FIFO read addressing and coefficient ROM selection.

It supports independent input/output serial interface configurations-including right-justified, left-justified, and word-clock-triggered modes-with programmable bit clock polarity (BKPOL_I/O) and mode pins (MODE0/1_I/O). The device dynamically adjusts low-pass filter cutoff when FSOUT < FSIN to prevent aliasing, maintaining full 20 kHz bandwidth down to 44.1 kHz sample rates.

Key Specifications

Pinout & Package

AD1893JN is housed in a 28-lead plastic DIP (N-28) package with 0.6" width, lead pitch of 0.1", and through-hole mounting. Pin 14 is GND; pins 7 and 22 are VDD; pins 9 and 20 are NC (no connect). All power and ground pins require local decoupling per Analog Devices' layout guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar asynchronous sample rate conversion applications.

Compared with AK4121AVN and CS8422-CQZ, the AD1893JN offers unique value in ultra-low-power, zero-configuration ASRC for battery-operated 16-bit audio-its on-chip oscillator, 3 V operation, and automatic jitter-adaptive settling eliminate design complexity not addressed by either alternative.

Availability

AD1893JN is available at Aetrix Electronics and suitable for consumer portable audio recorders, digital audio network gateways, computer multimedia interfaces, and 8 mm video tape recorder audio subsystems requiring stable component supply across extended production lifecycles.

Supply support for AD1893JN 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and audio systems.

The AD1893JN belongs to the SamplePort® family of asynchronous sample rate converters, engineered specifically for low-cost, low-voltage digital audio equipment where battery life, board space, and zero-configuration interoperability are critical design constraints.

FAQ

What sample rate combinations does the AD1893JN support?

The AD1893JN supports any input/output sample clock pair between 8 kHz and 56 kHz, including standard formats like CD (44.1 kHz), DAT (48 kHz), and broadcast (32 kHz). The ratio between FSIN and FSOUT must remain within approximately 1:2 to 2:1. The AD1893JN automatically senses and tracks these relationships-no software configuration or register writes are needed for valid combinations.

How does the AD1893JN handle clock jitter, and what is its tolerance?

The AD1893JN rejects sample clock jitter via a digital servo control loop that averages LR_I and LR_O timing events. In slow-settling mode (SETSLW = HI), it attenuates jitter above 3 Hz and tolerates up to 10 ns of jitter for ≤1 dB THD+N degradation at 10 kHz. This eliminates dependency on ultra-stable external clocks and simplifies system-level jitter management in the AD1893JN design.

Does the AD1893JN require an external oscillator, or can it operate with just a crystal?

The AD1893JN includes an on-chip oscillator and requires only a 16 MHz fundamental-mode crystal connected between XTAL_I (Pin 2) and XTAL_O (Pin 1). No external oscillator IC is needed-this reduces bill-of-materials cost and PCB footprint. The AD1893JN also supports overdriving XTAL_I with an external clock source if preferred.

What is the function of the MUTE_O and MUTE_I pins on the AD1893JN?

MUTE_O (Pin 16) asserts HIGH when the internal FIFO read/write pointers overlap-indicating transient underflow or overflow during rapid sample rate transitions. When tied to MUTE_I (Pin 15), it forces the serial output (DATA_O) to zero-valued samples, preventing audible clicks or pops. This hardware-mute mechanism is fully autonomous in the AD1893JN and requires no host processor intervention.

Can the AD1893JN interface directly with I²S-compatible devices?

Yes-the AD1893JN supports I²S-compatible operation on both input and output ports via its flexible serial interface modes. Setting MODE0_I/MODE1_I and MODE0_O/MODE1_O to "00" configures left-justified timing aligned to LR_I/LR_O rising edges, matching standard I²S timing. Bit clock polarity (BKPOL_I/O) allows alignment to either rising or falling edges, ensuring reliable handshaking with diverse I²S peripherals in the AD1893JN system.