Analog Devices AD1854 Datasheet

a

Stereo, 96 kHz, Multibit  DAC

AD1854

FEATURES
5 V Stereo Audio DAC System
Accepts 16-/18-/20-/24-Bit Data
Supports 24 Bits and 96 kHz Sample Rate
Multibit Sigma-Delta Modulator with “Perfect Differential

Linearity Restoration” for Reduced Idle Tones and

Noise Floor
Data Directed Scrambling DAC—Least Sensitive to Jitter
Differential Output for Optimum Performance
113 dB Dynamic

Range at 48 kHz Sample Rate

(AD1854KRS)
112 dB Signal-to-Noise at 48 kHz Sample Rate

(AD1854KRS)
–101 THD+N (AD1854KRS)
On-Chip Volume Control with 1024 Steps
Hardware and Software Controllable Clickless Mute
Zero Input Flag Outputs for Left and Right Channels
Digital De-Emphasis Processing
Supports 256  F

or 384  FS Master Mode Clock

S

Switchable Clock Doubler
Power-Down Mode Plus Soft Power-Down Mode
Flexible Serial Data Port with Right-Justified, Left-

Justified, and I

2

S-Compatible

28-Lead SSOP Plastic Package

APPLICATIONS
DVD, CD, Set-Top Boxes, Home Theater Systems,

Automotive Audio Systems, Sampling Musical

Keyboards, Digital Mixing Consoles, Digital Audio

Effects Processors

PRODUCT OVERVIEW

The AD1854 is a high performance, single-chip stereo, audio
DAC delivering 113 dB Dynamic Range and 112 dB SNR
(A-weighted—not muted) at 48 kHz sample rate. It is comprised
of a multibit sigma-delta modulator with dither, continuous
time analog filters and analog output drive circuitry. Other features
include an on-chip stereo attenuator and mute, programmed
through an SPI-compatible serial control port. The AD1854
is fully compatible with current DVD formats, including 96 kHz
sample frequency and 24 bits. It is also backwards compatible
by supporting 50 µs/15 µs digital de-emphasis intended for
“redbook” 44.1 kHz sample frequency playback from com­pact discs.

The AD1854 has a very simple but very flexible serial data input
port that allows for glueless interconnection to a variety of ADCs,
DSP chips, AES/EBU receivers and sample rate converters.
The AD1854 can be configured in left-justified, I

2

S, and right­justified. The AD1854 accepts serial audio data in MSB first,
twos-complement format. A power-down mode is offered to mini­mize power consumption when the device is inactive. The AD1854
operates from a single 5 V power supply. It is fabricated on a single
monolithic integrated circuit and housed in a 28-lead SSOP
package for operation over the temperature range 0°C to 70°C.

FUNCTIONAL BLOCK DIAGRAM

VOLUME

MUTE

AD1854

8  F

16-/18-/20-/24-BIT

DIGITAL

DATA INPUT

SERIAL

MODE

2

SERIAL

DATA

INTERFACE

ATTEN/

MUTE

ATTEN/

MUTE

PD/RST

S

INTERPOLATOR

8  F

S

INTERPOLATOR

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.

CLOCK

IN

CLOCK

CIRCUIT

22

96/48F
CLOCK

OUTPUT
BUFFER

OUTPUT
BUFFER

S

ANALOG
OUTPUTS

DAC

DAC

SUPPLY

DIGITAL
SUPPLY

2

ZERO
FLAG

CONTROL DATA

INPUT

3

SERIAL CONTROL

INTERFACE

MULTIBIT SIGMA-

DELTA MODULATOR

MULTIBIT SIGMA-

DELTA MODULATOR

DE-EMPHASISMUTE

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 2000

VOLTAGE

REFERENCE

ANALOG

AD1854–SPECIFICATIONS

TEST CONDITIONS UNLESS OTHERWISE NOTED

Supply Voltages (AVDD, DVDD) 5.0 V
Ambient Temperature 25°C
Input Clock 12.288 MHz (256 × F
Input Signal 1.0013 kHz

–0.5 dB Full Scale
Input Sample Rate 48 kHz
Measurement Bandwidth 20 Hz to 20 kHz
Word Width 20 Bits
Load Capacitance 100 pF
Load Impedance 47 kΩ
Input Voltage HI 2.4 V
Input Voltage LO 0.8 V

Performance of right and left channels are identical (exclusive of the Interchannel Gain Mismatch and Interchannel Phase Deviation specifications).

ANALOG PERFORMANCE

Resolution 20 Bits
Signal-to-Noise Ratio (20 Hz to 20 kHz)

No Filter (AD1854JRS) 105 dB
No Filter (AD1854KRS) 110 dB
With A-Weighted Filter (AD1854JRS) 108 dB
With A-Weighted Filter (AD1854KRS) 112 dB

Dynamic Range (20 Hz to 20 kHz, –60 dB Input)

No Filter (AD1854JRS) 105 dB
No Filter (AD1854KRS) 106 110 dB
With A-Weighted Filter (AD1854JRS) 108 dB

With A-Weighted Filter (AD1854KRS) 108 113 dB
Total Harmonic Distortion + Noise (AD1854JRS) V
Total Harmonic Distortion + Noise (AD1854KRS) V
Total Harmonic Distortion + Noise (AD1854JRS and –89 dB

AD1854KRS) V

= –20 dB

O

Total Harmonic Distortion + Noise (AD1854JRS and –49 dB

AD1854KRS) V

= –60 dB

O

Analog Outputs

Differential Output Range (±Full Scale) 5.6 V p-p

Output Impedance at Each Output Pin <200 Ω

Output Capacitance at Each Output Pin 20 pF
Out-of-Band Energy (0.5 × F

to 100 kHz) –72.5 dB

S

CMOUT 2.25 V
DC Accuracy

Gain Error –11.0 ± 3.0 +11.0 %

Interchannel Gain Mismatch –0.15 +0.15 dB

Gain Drift 200 300 ppm/°C
Interchannel Crosstalk (EIAJ Method) –120 dB
Interchannel Phase Deviation ± 0.1 Degrees
Mute Attenuation –100 dB
De-Emphasis Gain Error ± 0.1 dB

Mode)

S

Min Typ Max Unit

= 0 dB –88 –97 dB

O

= 0 dB –94 –101 dB

O

DIGITAL I/O (0C to 70C)

Min Typ Max Unit

Input Voltage HI (V
Input Voltage LO (V
High Level Output Voltage (V
Low Level Output Voltage (V
Input Leakage (I
Input Leakage (I

) 2.2 V

IH

) 0.8 V

IL

@ VIH = 2.4 V) 10 µA

IH

@ V

IL

IL

) IOH = 1 mA 2.0 V

OH

) IOL = 1 mA 0.4 V

OL

= 0.8 V) 10 µA

Input Capacitance 20 pF

–2–

REV. A

AD1854

POWER

Min Typ Max Unit

Supplies

Voltage, Analog and Digital 4.5 5 5.5 V
Analog Current 26 30 35 mA
Analog Current—Power-Down 26 29 33.5 mA
Digital Current 14 17 20 mA
Digital Current—Power-Down 1.5 2.5 5.5 mA

Dissipation

Operation—Both Supplies 250 mW
Operation—Analog Supply 150 mW
Operation—Digital Supply 100 mW
Power-Down—Both Supplies 190 mW

Power Supply Rejection Ratio

1 kHz 300 mV p-p Signal at Analog Supply Pins –60 dB
20 kHz 300 mV p-p Signal at Analog Supply Pins –50 dB

TEMPERATURE RANGE

Min Typ Max Unit

Specifications Guaranteed 25 °C
Functionality Guaranteed 0 70 °C
Storage –55 +125 °C

DIGITAL TIMING (Guaranteed over 0C to 70C, AV

= DVDD = 5.0 V  10%)

DD

Min Max Unit

t

DMP

t

DMP

t

DMP

t

DML

t

DMH

t

DBH

t

DBL

t

DBP

t

DLS

t

DLH

t

DDS

t

DDH

t

PDRP

MCLK Period (512 FS Mode) 35 ns
MCLK Period (384 FS Mode) 48 ns
MCLK Period (256 FS Mode) 70 ns
MCLK LO Pulsewidth (All Mode) 0.4 × t
MCLK HI Pulsewidth (All Mode) 0.4 × t

DMP

DMP

ns

ns
BCLK HI Pulsewidth 20 ns
BCLK LO Pulsewidth 20 ns
BCLK Period 140 ns
L/RCLK Setup 20 ns
L/RCLK Hold (DSP Serial Port Mode Only) 5 ns
SDATA Setup 5 ns
SDATA Hold 10 ns
PD/RST LO Pulsewidth 4 MCLK Periods ns

DIGITAL FILTER CHARACTERISTICS

Min Typ Max Unit

Passband Ripple ±0.04 dB
Stopband Attenuation 47 dB

Passband 0.448 F
Stopband 0.552 F

Group Delay 106/F

S

sec

Group Delay Variation 0 µs

Specifications subject to change without notice.

S

S

–3–REV. A

AD1854

TOP VIEW

(Not to Scale)

28

27

26

25

24

23

22

21

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

AD1854

FILTR

OUTR–

OUTR+

AGND

96/48

DEEMP

ZEROR

DGND

MCLK

CLATCH

CCLK

X2MCLK

384/256

CDATA

AGND

OUTL–

OUTL+

AVDD

FILTB

IDPM1

IDPM0

DVDD

SDATA

BCLK

L/RCLK

ZEROL

MUTE

PD/RST

ABSOLUTE MAXIMUM RATINGS*

Min Max Unit

DV

to DGND –0.3 +6 V

DD

to AGND –0.3 +6 V

AV

DD

Digital Inputs DGND – 0.3 DV
Analog Outputs AGND – 0.3 AV

+ 0.3 V

DD

+ 0.3 V

DD

AGND to DGND –0.3 +0.3 V
Reference Voltage (AV

+ 0.3)/2

DD

Soldering 300 °C

10 sec

*Stresses greater than those listed under Absolute Maximum Ratings may cause

permanent damage to the device. This is a stress rating only; functional operation
of the device at these or any other conditions above those indicated in the
operational section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.

PACKAGE CHARACTERISTICS

Min Typ Max Unit

θ

(Thermal Resistance 109 °C/W

JA

[Junction-to-Ambient])

(Thermal Resistance 39 °C/W

θ

JC

[Junction-to-Case])

ORDERING GUIDE

PIN CONFIGURATION

Model Temperature Package Description Package Option

AD1854JRS 0°C to 70°C 28-Lead Shrink Small Outline RS-28
AD1854JRSRL 0°C to 70°C 28-Lead Shrink Small Outline RS-28 on 13" Reels
AD1854KRS 0°C to 70°C 28-Lead Shrink Small Outline RS-28
AD1854KRSRL 0°C to 70°C 28-Lead Shrink Small Outline RS-28 on 13" Reels

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.

WARNING!

Although the AD1854 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.

–4–

ESD SENSITIVE DEVICE

REV. A