ad1864p-j Analog Devices, Inc., ad1864p-j Datasheet

ad1864p-j

Manufacturer Part Number

ad1864p-j

Description

Complete Dual 18-bit Audio Dac

Manufacturer

Analog Devices, Inc.

Datasheet

1.AD1864P-J.pdf (12 pages)

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PRODUCT DESCRIPTION

The AD1864 is a complete dual 18-bit DAC offering excellent

THD+N, while requiring no external components. Two com-

plete signal channels are included. This results in cophased

voltage or current output signals and eliminates the need for

output demultiplexing circuitry. The monolithic AD1864 chip

includes CMOS logic elements, bipolar and MOS linear

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

fabricated on Analog Devices BiMOS II process.

The DACs on the AD1864 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 provide extremely low total harmonic distortion.

This architecture minimizes errors at major code transitions

resulting in low output glitch and eliminating the need for an

external deglitcher. When used in the current output mode, the

AD1864 provides two cophased 1 mA output signals.

Each channel is equipped with a high performance output

amplifier. These amplifiers achieve fast settling and high slew

rate, producing 3 V signals at load currents up to 8 mA. Each

output amplifier is short-circuit protected and can withstand

indefinite short circuits to ground.

The AD1864 was designed to balance two sets of opposing

requirements, channel separation and DAC matching. High

channel separation is the result of careful layout techniques. At

the same time, both channels of the AD1864 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.

REV. A

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.

FEATURES

Dual Serial Input, Voltage Output DACs

No External Components Required

Operates at 8

Cophased Outputs

115 dB Channel Separation

0.0017% THD+N

APPLICATIONS

Multichannel Audio Applications:

Compact Disc Players

Multivoice Keyboard Instruments

DAT Players and Recorders

Digital Mixing Consoles

Multimedia Workstations

5 V to

0.3% Interchannel Gain Matching

12 V Operation

Oversampling per Channel

A versatile digital interface allows the AD1864 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

output. 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 AD1864 operates from 5 V to 12 V power supplies. The

digital supplies, V

supplies, V

analog and digital ground pins are also provided. The AD1864

typically dissipates only 225 mW, with a maximum power

dissipation of 265 mW.

The AD1864 is packaged in both a 24-pin plastic DIP and a

28-pin PLCC. Operation is guaranteed over the temperature

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

PRODUCT HIGHLIGHTS

1. The AD1864 is a complete dual 18-bit audio DAC.

2. 108 dB signal-to-noise ratio for low noise operation.

3. THD+N is typically 0.0017%.

4. Interchannel gain and midscale matching.

5. Output voltages and currents are cophased.

6. Low glitch for improved sound quality.

7. Both channels are 100% tested at 8 F

8. Low Power—only 225 mW typ, 265 mW max.

9. Five-wire Interface for individual DAC control.

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

Tel: 617/329-4700

Fax: 617/326-8703

4.75 V to 13.2 V.

AGND

TRIM

MSB

CLK

–V

OUT

and –V

LATCH

18-BIT

DIP BLOCK DIAGRAMS

–

REFERENCE

and –V

, for reduced digital feedthrough. Separate

World Wide Web Site: http://www.analog.com

18-BIT

D/A

AD1864

, can be separated from the analog

18-Bit Audio DAC

18-BIT

Complete Dual

D/A

REFERENCE

LATCH

18-BIT

–

AD1864

MSB

–V

TRIM

AGND

DGND

OUT

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ad1864p-j Summary of contents

Page 1

... One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 AD1864 TRIM 22 MSB 21 I OUT 20 AGND – OUT 16 – 18-BIT LATCH DGND . S © Analog Devices, Inc., 1997 ...

Page 2

AD1864–SPECIFICATIONS RESOLUTION DIGITAL INPUTS 0 Clock Input Frequency ACCURACY Gain Error Interchannel Gain Matching Midscale Error Interchannel Midscale Matching Gain Linearity ...

Page 3

FREQUENCY – kHz Figure 1. THD+N vs. Frequency 130 120 110 100 ...

Page 4

... AD1864N 20 V OUT AD 1864N-J 19 –V L AD1864N-K AD1864P 18 AD1864P Plastic DIP Plastic Leaded Chip Carrier. –4– L WARNING! ESD SENSITIVE DEVICE PIN FUNCTION DESCRIPTIONS Description Negative Analog Supply Right Channel Trim Network Connection Right Channel Trim Potentiometer Connection Right Channel Output Current ...

Page 5

TOTAL HARMONIC DISTORTION + NOISE Total Harmonic Distortion plus Noise (THD+N) is defined as the ratio of the square root of the sum of the squares of the amplitudes of the harmonics and noise to the value of the fundamental ...

Page 6

AD1864 GROUNDING RECOMMENDATIONS The AD1864 has three ground pins, two labeled AGND and one labeled DGND. AGND, the analog ground pins, are the “high quality” ground references for the device. To minimize distortion and reduce crosstalk between channels, the analog ...

Page 7

CURRENT OUTPUT MODE One or both channels of the ADl864 can be operated in current output mode. I can be used to directly drive an external OUT current-to-voltage (I-V) converter. The internal feedback resistor can still be used ...

Page 8

AD1864 –5V ANALOG SUPPLY SM5813AP BCKO WCKO 25 5 DOL 24 6 DOR SS1 SS2 ...

Page 9

VOICE 1 OUTPUT +5V ANALOG SUPPLY –5V ANALOG SUPPLY AD1864 1 – TRIM 23 TRIM 3 MSB MSB OUT OUT 5 AGND AGND 20 ANALOG COMMON ...

Page 10

AD1864 1 SM5814AP (22-PIN DIP SOMD1 5 SOMD2 BCKO 7 WDCO 8 9 DOR DOL 10 11 DGL Figure 13. AD1864 with NPC SM5814AP Digital Filter YM3434 1 SHL SHR 2 16/18 ...

Page 11

GND 2 TEST CXD1244S 16.9344 9 XIN MHz OUT 16/ LFS 18 SONY/12S 19 20 TEST Figure 15. AD1864 with Sony ...

Page 12

AD1864 OTHER DIGITAL AUDIO COMPONENTS AVAILABLE AD1856 16-BIT AUDIO DAC Complete, No External Components Required 0.0025% THD Low Cost 16-Pin DIP or SOIC Package Standard Pinout FROM ANALOG DEVICES AD1860 18-BIT AUDIO DAC Complete, No External Components Required 0.002% THD+N ...

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