AD1865 datasheet, PDF - EEWORLD Datasheet

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AD1865: DescriptionComplete Dual 18-Bit 16 x Fs Audio DAC; File Size155KB，12 Pages; ManufacturerADI; Websitehttps://www.analog.com

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AD1865 Overview

Complete Dual 18-Bit 16 x Fs Audio DAC

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FEATURES

Dual Serial Input, Voltage Output DACs

No External Components Required

110 dB SNR

0.003% THD+N

Operates at 16 Oversampling per Channel

5 Volt Operation

Cophased Outputs

116 dB Channel Separation

Pin Compatible with AD1864

DIP or SOIC Packaging

APPLICATIONS

Multichannel Audio Applications

Compact Disc Players

Multivoice Keyboard Instruments

DAT Players and Recorders

Digital Mixing Consoles

Multimedia Workstations

PRODUCT DESCRIPTION

–V

TRIM

MSB

OUT

AGND

OUT

CLK

Complete Dual 18-Bit

16 F

Audio DAC

AD1865*

FUNCTIONAL BLOCK DIAGRAM

(DIP Package)

AD1865

REFERENCE

18-BIT

LATCH

18-BIT

D/A

18-BIT

D/A

18-BIT

LATCH

NC = NO CONNECT

MSB

OUT

AGND

OUT

DGND

24 +V

23 TRIM

The AD1865 is a complete, dual 18-bit DAC offering excellent

THD+N and SNR while requiring no external components. Two

complete signal channels are included. This results in cophased

voltage or current output signals and eliminates the need for

output demultiplexing circuitry. The monolithic AD1865 chip

includes CMOS logic elements, bipolar and MOS linear ele-

ments and laser-trimmed thin-film resistor elements, all fabri-

cated on Analog Devices’ ABCMOS process.

The DACs on the AD1865 chip employ a partially segmented

architecture. The first four MSBs of each DAC are segmented

into 15 elements. The 14 LSBs are produced using standard R-2R

techniques. Segment and R-2R resistors are laser trimmed to pro-

vide extremely low total harmonic distortion. This architecture

minimizes errors at major code transitions resulting in low out-

put glitch and eliminating the need for an external deglitcher.

When used in the current output mode, the AD1865 provides

two

1 mA output signals.

Each channel is equipped with a high performance output am-

plifier. These amplifiers achieve fast settling and high slew rate,

producing

3 V signals at load currents up to 8 mA. Each out-

put amplifier is short-circuit protected and can withstand indefi-

nite short circuits to ground.

The AD1865 was designed to balance two sets of opposing re-

quirements, channel separation and DAC matching. High chan-

nel separation is the result of careful layout. At the same time,

both channels of the AD1865 have been designed to ensure

matched gain and linearity as well as tracking over time and

temperature. This assures optimum performance when used in

stereo and multi-DAC per channel applications.

*Protected

by U.S. Patents Nos.: RE 30,586; 3,961,326; 4,141,004;

4,349,811; 4,855,618; 4,857,862.

A versatile digital interface allows the AD1865 to be directly

connected to standard digital filter chips. This interface employs

five signals: Data Left (DL), Data Right (DR), Latch Left (LL),

Latch Right (LR) and Clock (CLK). DL and DR are the serial

input pins for the left and right DAC input registers. Input data

bits are clocked into the input register on the rising edge of

CLK. A low-going latch edge updates the respective DAC out-

put. For systems using only a single latch signal, LL and LR

may be connected together. For systems using only one DATA

signal, DR and DL may be connected together.

The AD1865 operates with

5 V power supplies. The digital

supply, V

, can be separated from the analog supplies, V

and

–V

, for reduced digital feedthrough. Separate analog and digital

ground pins are also provided. The AD1865 typically dissipates

only 225 mW, with a maximum power dissipation of 260 mW.

The AD1865 is packaged in both a 24-pin plastic DIP and a

28-pin SOIC package. Operation is guaranteed over the temper-

ature range of –25°C to +70°C and over the voltage supply

range of

4.75 V to

5.25 V.

PRODUCT HIGHLIGHTS

REV. 0

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

11.

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The AD1865 is a complete dual 18-bit audio DAC.

110 dB signal-to-noise ratio for low noise operation.

THD+N is typically 0.003%.

Interchannel gain and midscale matching.

Output voltages and currents are cophased.

Low glitch for improved sound quality.

Both channels are 100% tested at 16

Low Power—only 225 mW typ, 260 mW max.

Five-wire interface for individual DAC control.

24-pin DIP or 28-pin SOIC packages available.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700

Fax: 617/326-8703

AD1865 Related Products

	AD1865	AD1865N-J	AD1865R	AD1865R-J
Description	Complete Dual 18-Bit 16 x Fs Audio DAC	Complete Dual 18-Bit 16 x Fs Audio DAC	Complete Dual 18-Bit 16 x Fs Audio DAC	Complete Dual 18-Bit 16 x Fs Audio DAC

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