Burr Brown PCM1744U, PCM1744U-2K Datasheet

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1

PCM1744

24 Bits, 96kHz,

Sampling Stereo Audio

DIGITAL-TO-ANALOG CONVERTER

PCM1744

DESCRIPTION

The PCM1744 is a complete low cost stereo audio
digital-to-analog converter (DAC), operating off of a
256fS or 384fS system clock. The DAC contains a 3rd­order ∆Σ modulator, a digital interpolation filter, and
an analog output amplifier. The PCM1744 accepts
24-bit input data in a I2S format.

The digital filter performs an 8x interpolation function
and includes de-emphasis at 44.1kHz. The PCM1744
can accept digital audio sampling frequencies from
16kHz to 96kHz, always at 8X oversampling.

The PCM1744 is ideal for low-cost, CD-quality con­sumer audio applications.

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FEATURES

● COMPLETE STEREO DAC: Includes Digital

Filter and Output Amp

● DYNAMIC RANGE: 95dB

● MULTIPLE SAMPLING FREQUENCIES:

Up to 96kHz

● 8x OVERSAMPLING DIGITAL FILTER

● SYSTEM CLOCK: 256fS/384f

S

● 24-BIT I2S DATA INPUT FORMAT

● SMALL 14-PIN SOIC PACKAGE

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: [phone] • Twx: 910-952-1111

Internet: http://www.burr-brown.com/ • FAXLine: [phone] (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]

© 1999 Burr-Brown Corporation PDS-1553A Printed in U.S.A. September, 1999

For most current data sheet and other product

information, visit www.burr-brown.com

Serial

Input

I/F

Mode

Control

I/F

8X Oversampling

Digital Filter

SCKI

256f

S

/384f

S

V

CC

GND

Multi-level

Delta-Sigma

Modulator

V

OUT

L

CAP

DAC

Multi-level

Delta-Sigma

Modulator

Low-pass

Filter

Low-pass

Filter

V

OUT

R

DAC

FORMAT

LRCIN

DIN

BCKIN

DM

Power Supply

TM

PCM1744

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PCM1744

SPECIFICATIONS

All specifications at +25°C, +V

CC

= +5V, fS = 44.1kHz, and 18-bit input data, SYSCLK = 384fS, unless otherwise noted.

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.

PCM1744

PARAMETER CONDITIONS MIN TYP MAX UNITS
RESOLUTION 24 Bits

DATA FORMAT

Audio Data Interface Format I

2

S

Audio Data Format Two’s Binary Complement
Sampling Frequency (f

S

) 16 96 kHz

Internal System Clock Frequency 256f

S

/384f

S

DIGITAL INPUT/OUTPUT

Logic Level TTL
Input Logic Level

V

IH

(1)

2.0 VDC

V

IL

(1)

0.8 VDC

Input Logic Current: I

IN

(1)

±0.8 µA

DYNAMIC PERFORMANCE

(2)

f = 991kHz

THD+N at FS (0dB) –83 –79 dB
THD+N at –60dB –32 dB
Dynamic Range EIAJ, A-weighted 90 95 dB
Signal-to-Noise Ratio EIAJ, A-weighted 90 97 dB
Channel Separation 88 95 dB

DC ACCURACY

Gain Error ±1.0 ±10.0 % of FSR
Gain Mismatch, Channel-to-Channel ±1.0 ±5.0 % of FSR

Bipolar Zero Error V

OUT

= VCC/2 at BPZ ±20 ±50 mV

ANALOG OUTPUT

Output Voltage Full Scale (0dB) 0.62 x V

CC

Vp-p

Center Voltage V

CC

/2 VDC

Load Impedance AC Load 10 kΩ

DIGITAL FILTER PERFORMANCE

Passband 0.445 f

S

Stopband 0.555 f

S

Passband Ripple ±0.17 dB
Stopband Attenuation –35 dB
Delay Time 11.125/f

S

sec

INTERNAL ANALOG FILTER

–3dB Bandwidth 100 kHz
Passband Response f = 20kHz –0.16 dB

POWER SUPPLY REQUIREMENTS

Voltage Range 4.5 5 5.5 VDC
Supply Current 13 18 mA
Power Dissipation 65 90 mW

TEMPERATURE RANGE

Operation –25 +85 °C
Storage –55 +125 °C

NOTES: (1) Pins 1, 2, 3, 12, 13, 14: LRCIN, DIN, BCKIN, DM, FORMAT, SCKI. (2) Dynamic performance specs are tested with 20kHz low pass filter and THD+N
specs are tested with 30kHz LPF, 400Hz HPF, Average-Mode.

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PCM1744

PIN ASSIGNMENTS

PIN NAME I/O FUNCTION

1

(1)

LRCIN IN Sample Rate Clock Input

2

(1)

DIN IN Audio Data Input

3

(1)

BCKIN IN Bit Clock Input for Audio Data.
4 NC — No Connection
5 CAP — Common Pin of Analog Output Amp
6V

OUT

R OUT Right-Channel Analog Output
7 GND — Ground
8VCC— Power Supply
9V

OUT

L OUT Left-Channel Analog Output
10 NC — No Connection
11 NC — No Connection
12

(2)

DM IN De-Emphasis Control

HIGH: De-emphasis ON
LOW: De-emphasis OFF

13

(2)

TEST — Test Pin. Must be left open.

14

(1)

SCKI IN System Clock Input (256fS or 384fS)

NOTE: (1) Schmitt-Trigger input. (2) Schmitt-Trigger input with internal pull-up.

PIN CONFIGURATION

TOP VIEW SOIC

ABSOLUTE MAXIMUM RATINGS

Power Supply Voltage ...................................................................... +6.5V

+V

CC

to +VDD Difference ...................................................................±0.1V

Input Logic Voltage ..................................................–0.3V to (V

DD

+ 0.3V)

Power Dissipation ..........................................................................290mW

Operating Temperature Range ......................................... –25°C to +85°C

Storage Temperature...................................................... –55°C to +125°C

Lead Temperature (soldering, 5s).................................................. +260°C

Thermal Resistance,

θ

JA

..............................................................+90°C/W

ELECTROSTATIC
DISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.

ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may
be more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.

PACKAGE SPECIFIED
DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT

PRODUCT PACKAGE NUMBER

(1)

RANGE MARKING NUMBER

(2)

MEDIA

PCM1744 SO-14 235 –25°C to +85°C PCM1744U PCM1744U Rails

" " " " PCM1744U PCM1744U/2K Tape and Reel

NOTES: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book, or visit the Burr-Brown web site
at www.burr-brown.com. (2) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K indicates 2000 devices per reel). Ordering
2000 pieces of “PCM1744U/2K” will get a single 2500-piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to Appendix B of Burr-Brown
IC Data Book.

PACKAGE/ORDERING INFORMATION

LRCIN

DIN

BCKIN

NC

CAP

V

OUT

R

GND

SCKI
TEST
DM
NC
NC
V

OUT

L

V

CC

1
2
3
4
5
6
7

14
13
12
11
10

9
8

PCM1744