AD1865NK Analog Devices, AD1865NK Datasheet

AD1865NK

Manufacturer Part Number

AD1865NK

Description

DIP24

Manufacturer

Analog Devices

Datasheet

1.AD1865NK.pdf (12 pages)

Specifications of AD1865NK

Date_code

05+

Current page: 1 of 12
Download datasheet (150Kb)

PRODUCT DESCRIPTION

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;

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.

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

FEATURES

Dual Serial Input, Voltage Output DACs

No External Components Required

110 dB SNR

0.003% THD+N

Operates at 16

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

5 Volt Operation

Oversampling per Channel

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

–V

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

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

12. 110 dB signal-to-noise ratio for low noise operation.

13. THD+N is typically 0.003%.

14. Interchannel gain and midscale matching.

15. Output voltages and currents are cophased.

16. Low glitch for improved sound quality.

17. Both channels are 100% tested at 16

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

19. Five-wire interface for individual DAC control.

10. 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

, for reduced digital feedthrough. Separate analog and digital

AGND

TRIM

MSB

–V

CLK

OUT

, can be separated from the analog supplies, V

FUNCTIONAL BLOCK DIAGRAM

LATCH

18-BIT

REFERENCE

Complete Dual 18-Bit

(DIP Package)

NC = NO CONNECT

18-BIT

D/A

AD1865

18-BIT

D/A

REFERENCE

LATCH

18-BIT

AD1865*

Audio DAC

Fax: 617/326-8703

TRIM

MSB

DGND

AGND

OUT

and

Related parts for AD1865NK

Related keywords

AD1865NK datasheet
AD1865NK data sheet
AD1865NK pdf datasheet
AD1865NK component
AD1865NK part
AD1865NK distributor
AD1865NK RoHS
AD1865NK datasheet download