TEXAS INSTRUMENTS PCM1748 Technical data

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Enhanced Multilevel, Delta-Sigma, Audio

PCM1748

PCM1748

SBAS165A – MAY 2001

24-Bit, 96kHz Sampling

DIGITAL-TO-ANALOG CONVERTER

FEATURES

●

24-BIT RESOLUTION

●

ANALOG PERFORMANCE (VCC = +5V):
Dynamic Range: 106dB typ (PCM1748KE)

100dB typ (PCM1748E)

SNR: 106dB typ (PCM1748KE)

100dB typ (PCM1748E)

THD+N: 0.002% typ (PCM1748KE)

0.003% typ (PCM1748E)

Full-Scale Output: 3.1Vp-p typ

●

8x OVERSAMPLING DIGITAL FILTER:
Stopband Attenuation: –55dB
Passband Ripple: ±0.03dB

●

SAMPLING FREQUENCY: 5kHz to 100kHz

●

SYSTEM CLOCK: 256, 384, 512, 768fS with
Auto Detect

●

ACCEPTS 16-, 18-, 20-, AND 24-BIT AUDIO
DATAzx

●

DATA FORMATS: Standard, I2S, and
Left-Justified

● USER-PROGRAMMABLE MODE CONTROLS:

Digital Attenuation: 0dB to –63dB, 0.5dB/Step
Digital De-Emphasis
Digital Filter Roll-Off: Sharp or Slow
Soft Mute
Zero Flags for Each Output

●

DUAL-SUPPLY OPERATION:
+5V Analog, +3.3V Digital

●

5V TOLERANT DIGITAL INPUTS

●

SMALL SSOP-16 PACKAGE

●

SAME PACKAGE SIZE AS SOP-8

APPLICATIONS

● A/V RECEIVERS

● DVD MOVIE PLAYERS

● DVD ADD-ON CARDS FOR HIGH-END PCs

● HDTV RECEIVERS

● CAR AUDIO SYSTEMS

● OTHER MULTICHANNEL AUDIO SYSTEMS

DESCRIPTION

The PCM1748 is a CMOS, monolithic, integrated circuit which
includes stereo Digital-to-Analog Converters (DACs) and support
circuitry in a small SSOP-16 package. The data converters utilize
Texas Instrument’s enhanced multilevel delta-sigma architecture
that employs fourth-order noise shaping and 8-level amplitude
quantization to achieve excellent dynamic performance and im­proved tolerance to clock jitter. The PCM1748 accepts industry
standard audio data formats with 16- to 24-bit data, providing easy
interfacing to audio DSP and decoder chips. Sampling rates up to
100kHz are supported. A full set of user-programmable functions
are accessible through a 3-wire serial control port that supports
register write functions.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

Copyright © 2000, Texas Instruments Incorporated

www.ti.com

ABSOLUTE MAXIMUM RATINGS

Power Supply Voltage, VDD.............................................................. +4.0V

Ground Voltage Differences..............................................................±0.1V

Digital Input Voltage................................................–0.3V to (6.5V + 0.3V)

Input Current (except power supply)............................................... ±10mA

Ambient Temperature Under Bias .................................. –40°C to +125°C

Storage Temperature...................................................... –55°C to +150°C

Junction Temperature .................................................................... +150°C

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

Package Temperature (IR reflow, 10s) .......................................... +235°C

.............................................................. +6.5V

V

CC

This integrated circuit can be damaged by ESD. Texas Instru­ments 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

ELECTROSTATIC
DISCHARGE SENSITIVITY

be more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.

PACKAGE/ORDERING INFORMATION

PACKAGE SPECIFIED

PRODUCT PACKAGE NUMBER RANGE MARKING NUMBER

DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT

PCM1748E SSOP-16 322 –25°C to +85°C PCM1748E PCM1748E Rails

"""""PCM1748E/2K Tape and Reel

PCM1748KE SSOP-16 322 –25°C to +85°C PCM1748KE PCM1748KE Rails

"""""PCM1748KE/2K Tape and Reel

NOTE: (1) 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 “PCM1748E/2K” will yield a single 2000-piece Tape and Reel.

(1)

MEDIA

PIN CONFIGURATION

TOP VIEW SSOP

BCK
DATA
LRCK

DGND

V
V

V

OUT

V

OUT

1
2
3
4
5

DD

6

CC

7

L

8

R

PCM1748

16

SCK

15

ML

14

MC

13

MD

12

ZEROL/NA

11

ZEROR/ZEROA

10

V

COM

9

AGND

PIN ASSIGNMENTS

PIN NAME TYPE FUNCTION

1 BCK IN Audio Data Bit Clock Input.
2 DATA IN Audio Data Digital Input.
3 LRCK IN L-Channel and R-Channel Audio Data Latch En-

4 DGND – Digital Ground
5VDD– Digital Power Supply, +3.3V
6V

CC

7V
8V

9 AGND – Analog Ground
10 V
11 ZEROR/ OUT Zero Flag Output for R-Channel/Zero Flag Output

12
13 MD IN Mode Control Data Input.
14 MC IN Mode Control Clock Input.
15 ML IN Mode Control Latch Input.
16 SCK IN System Clock Input.

NOTES: (1) Schmitt-trigger input, 5V tolerant. (2) Schmitt-trigger with internal
pull-down, 5V tolerant.

L OUT Analog Output for L-Channel.

OUT

R OUT Analog Output for R-Channel.

OUT

COM

ZEROA for L/R-Channel.

ZEROL/NA

able Input.

– Analog Power Supply, +5V

– Common Voltage Decoupling.

OUT Zero Flag Output for L-Channel/No Assign.

(1)

(1)

(1)

(2)

(2)
(2)

2

PCM1748

SBAS165

ELECTRICAL CHARACTERISTICS

All specifications at TA = +25°C, VCC = 5.0V, V

PARAMETER CONDITIONS MIN TYP MAX UNITS
RESOLUTION 24 Bits

DATA FORMAT

Audio Data Interface Formats Standard, IIS, Left-Justified
Audio Data Bit Length 16-, 18-, 20-, 24-Bits Selectable
Audio Data Format MSB-First, Binary Two’s Complement
Sampling Frequency (f
System Clock Frequency 256, 384, 512, 768f

) 5 100 kHz

S

DIGITAL INPUT/OUTPUT

Logic Family TTL-Compatible
Input Logic Level

V

IH

V

IL

Input Logic Current

(1)

I

IH

(1)

I

IL

(2)

I

IH

(2)

I

IL

Output Logic Level

(3)

V

OH

(3)

V

OL

DYNAMIC PERFORMANCE

(4)

PCM1748E

THD+N at V

THD+N at V

= 0dB fS = 44.1kHz 0.003 0.008 %

OUT

= –60dB fS = 44.1kHz 1.2 %

OUT

Dynamic Range EIAJ, A-Weighted, f

Signal-to-Noise Ratio EIAJ, A-Weighted, f

Channel Separation f

Level Linearity Error V

PCM1748KE

THD+N at V

THD+N at V

= 0dB fS = 44.1kHz 0.002 0.006 %

OUT

= –60dB fS = 44.1kHz 0.65 %

OUT

Dynamic Range EIAJ, A-Weighted, f

Signal-to-Noise Ratio EIAJ, A-Weighted, f

Channel Separation f

Level Linearity Error V

DC ACCURACY

Gain Error ±1.0 ±6 % of FSR
Gain Mismatch, Channel-to-Channel ±1.0 ±3 % of FSR
Bipolar Zero Error V

ANALOG OUTPUT

Output Voltage Full Scale (0dB) 62% of V
Center Voltage 50% V
Load Impedance AC Load 5 kΩ

DIGITAL FILTER PERFORMANCE
Filter Characteristics 1, Sharp Roll-Off

Passband ±0.03dB 0.454f
Passband –3dB 0.487f
Stopband 0.546f
Passband Ripple ±0.03 dB
Stopband Attenuation Stopband = 0.546f
Stopband Attenuation Stopband = 0.567f

= 3.3V, fS = 44.1kHz, system clock = 384fS, and 24-bit data, unless otherwise noted.

DD

PCM1748E

PCM1748KE

2.0 VDC

VIN = V

DD

VIN = 0V –10 µA

VIN = V

DD

VIN = 0V –10 µA

I

= –2mA 2.4 VDC

OH

I

= +2mA 1.0 VDC

OL

= 96kHz 0.004 %

f

S

= 96kHz 1.6 %

f

S

A-Weighted, f

A-Weighted, f

= 44.1kHz 91 98 dB

S

f

S

OUT

f

S

f

S

A-Weighted, f

A-Weighted, f

= 44.1kHz 97 103 dB

S

f

S

OUT

= 0.5 VCC at Bipolar Zero ±30 ±60 mV

OUT

= 44.1kHz 94 100 dB

S

= 96kHz 98 dB

S

= 44.1kHz 94 100 dB

S

= 96kHz 98 dB

S

= 96kHz 96 dB

= –90dB ±0.5 dB

= 96kHz 0.003 %

= 96kHz 0.8 %

= 44.1kHz 100 106 dB

S

= 96kHz 104 dB

S

= 44.1kHz 100 106 dB

S

= 96kHz 104 dB

S

= 96kHz 101 dB

= –90dB ±0.5 dB

S

S
S

–50 dB
–55

65 100 µA

CC

CC

S

0.8 VDC

10 µA

Vp-p
VDC

S
S

dB

PCM1748

SBAS165

3

ELECTRICAL CHARACTERISTICS (Cont.)

All specifications at TA = +25°C, VCC = 5.0V, V

PARAMETER CONDITIONS MIN TYP MAX UNITS
DIGITAL FILTER PERFORMANCE (Cont.)

Filter Characteristics 2, Slow Roll-Off

Passband ±0.5dB 0.198f
Passband –3dB 0.390f
Stopband 0.884f
Passband Ripple ±0.5 d B
Stopband Attenuation Stopband = 0.884f
Delay Time 20/f
De-Emphasis Error ±0.1 dB

ANALOG FILTER PERFORMANCE

Frequency Response f = 20kHz –0.03 dB

POWER SUPPLY REQUIREMENTS

Voltage Range, V

Supply Current, I

DD

V

CC

(6)

DD

I

CC

(4)

Power Dissipation f

TEMPERATURE RANGE

Operation Temperature –25 +85 °C
Storage Temperature –55 +125 °C
Thermal Resistance

NOTES: (1) Pins 16, 1, 2, 3 (SCK, BCK, LRCK, DATA). (2) Pins 13-15 (MD, MC, ML). (3) Pins 11, 12 (ZEROR, ZEROL). (4) Analog performance specifications
are tested with a Shibasoku #725 THD Meter with 400Hz HPF on, 30kHz LPF on, and an average mode with 20kHz bandwidth limiting. The load connected
to the analog output is 5kΩ or larger, via capacitive coupling.

= 3.3V, system clock = 384fS (fS = 44.1kHz), and 24-bit data, unless otherwise noted.

DD

PCM1748E

PCM1748KE

S

S

–40 dB

f = 44kHz –0.20 dB

+3.0 +3.3 +3.6 VDC
+4.5 +5.0 +5.5 VDC

fS = 44.1kHz 6.0 10 mA

= 96kHz 13 mA

f

S

fS = 44.1kHz 8.5 13 mA

f

= 96kHz 9.0 mA

S

= 44.1kHz 62 98 mW

S

= 96kHz 88 mW

f

S

θ

JA

SSOP-16 115 °C/W

S
S

S

sec

BLOCK DIAGRAM

BCK

LRCK

DATA

ML

MC

MD

SCK

Serial

Input

I/F

Function

Control

I/F

System Clock

Manager

Oversampling

Digital Filter

System Clock

8x

with

Function

Controller

Enhanced

Multi-Level

Delta-Sigma

Modulator

Zero Detect

DAC

DAC

Output Amp and

Low-Pass Filter

Output Amp and

Low-Pass Filter

Power Supply

V

L

OUT

V

COM

V

R

OUT

DD

V

ZEROL

ZEROR

4

DGND

V

CC

AGND

PCM1748

SBAS165

TYPICAL CHARACTERISTICS

5
4
3
2
1
0

–1
–2
–3
–4
–5

TRANSITION CHARACTERISTICS (Slow Roll-Off)

0 0.1 0.2 0.3 0.4 0.5

Frequency (x f

S

)

Amplitude (dB)

0.05

0.04

0.03

0.02

0.01
0

–0.01
–0.02
–0.03
–0.04
–0.05

FREQUENCY RESPONSE PASSBAND

(Sharp Roll-Off)

0 0.1 0.2 0.3 0.4 0.5

Frequency (x f

S

)

Amplitude (dB)

0.5

0.4

0.3

0.2

0.1

0.0

–0.1
–0.2
–0.3
–0.4
–0.5

DE-EMPHASIS ERROR (f

S

= 32kHz)

02468101214

Frequency (kHz)

Error (dB)

All specifications at TA = +25°C, VCC = 5.0V, VDD = 3.3V, system clock = 384fS (fS = 44.1kHz), and 24-bit input data, unless otherwise noted.

DIGITAL FILTER

Digital Filter (De-Emphasis Off, fS = 44.1kHz)

0

–20

–40

–60

–80

Amplitude (dB)

–100

–120

–140

0

–20

–40

–60

FREQUENCY RESPONSE (Sharp Roll-Off)

01234

Frequency (x f

FREQUENCY RESPONSE (Slow Roll-Off)

)

S

–80

Amplitude (dB)

–100

–120

–140

01234

De-Emphasis and De-Emphasis Error

0.0

–1.0
–2.0
–3.0
–4.0
–5.0

PCM1748

–6.0

Level (dB)

–7.0
–8.0
–9.0

–10.0

02468101214

SBAS165

DE-EMPHASIS (f

Frequency (x f

= 32kHz)

S

Frequency (kHz)

)

S

5

TYPICAL CHARACTERISTICS (Cont.)

All specifications at TA = +25°C, VCC = 5.0V, VDD = 3.3V, system clock = 384fS (fS = 44.1kHz), and 24-bit input data, unless otherwise noted.

De-Emphasis and De-Emphasis Error (Cont.)

0.0

–1.0
–2.0
–3.0
–4.0
–5.0
–6.0

Level (dB)

–7.0
–8.0
–9.0

–10.0

02468101214161820

0.0

–1.0
–2.0
–3.0
–4.0
–5.0
–6.0

Level (dB)

–7.0
–8.0
–9.0

–10.0

02468101214

DE-EMPHASIS (f

Frequency (kHz)

DE-EMPHASIS (f

Frequency (kHz)

= 44.1kHz)

S

= 48kHz)

S

0.5

0.4

0.3

0.2

0.1

0.0

–0.1

Error (dB)

–0.2
–0.3
–0.4
–0.5

02468101214161820

0.5

0.4

0.3

0.2

0.1

0.0

–0.1

Error (dB)

–0.2
–0.3
–0.4
–0.5

18

16

2220

02468101214

DE-EMPHASIS ERROR (f

Frequency (kHz)

DE-EMPHASIS ERROR (f

Frequency (kHz)

= 44.1kHz)

S

= 48kHz)

S

16

18

2220

ANALOG DYNAMIC PERFORMANCE

All specifications at TA = +25°C, VCC = 5.0V, VDD = 3.3V, and 24-bit input data, unless otherwise noted.

Supply-Voltage Characteristics

(VDD = 3.3V)

CC

0dB/96kHz, 384f

0dB/44.1kHz, 384f

(V)

V

CC

110

S

S

108

106

104

102

S

S

SNR (dB)

100

98

96

4 4.5 5 5.5 6

0.1

0.01

THD+N (%)

0.001

0.0001

6

10

1

THD+N vs V

–60dB/96kHz, 384f

–60dB/44.1kHz, 384f

4 4.5 5 5.5 6

DYNAMIC RANGE vs V

44.1kHz, 384f

96kHz, 384f

S

(V)

V

CC

(VDD = 3.3V)

CC

S

PCM1748

SBAS165

TYPICAL CHARACTERISTICS (Cont.)

110

108

106

104

102

100

98

96

CHANNEL SEPARATION vs V

CC

(VDD = 3.3V)

4 4.5 5 5.5 6

V

CC

(V)

Channel Separation (dB)

44.1kHz, 384f

S

96kHz, 384f

S

110

108

106

104

102

100

98

96

DYNAMIC RANGE vs T

A

–50 –25 0 25 50 75 100

Temperature (°C)

Dynamic Range (dB)

44.1kHz, 384f

S

96kHz, 384f

S

All specifications at TA = +25°C, VCC = 5.0V, VDD = 3.3V, and 24-bit input data, unless otherwise noted.

Supply-Voltage Characteristics (Cont.)

110

SNR vs V

(VDD = 3.3V)

CC

108

106

104

96kHz, 384f

102

SNR (dB)

100

98

96

4 4.5 5 5.5 6

V

CC

Temperature Characteristics

10

1

0.1

THD+N vs T

–60dB/96kHz, 384f

–60dB/44.1kHz, 384f

S

(V)

A

S

S

0.01

THD+N (%)

0.001

0dB/96kHz, 384f

0dB/44.1kHz, 384f

0.0001
–50 –25 0 25 50 75 100

110

108

106

104

102

SNR (dB)

100

98

96

–50 –25 0 25 50 75 100

PCM1748

SBAS165

S

Temperature (°C)

SNR vs T

A

44.1kHz, 384f

96kHz, 384f

S

Temperature (°C)

S

110

CHANNEL SEPARATION vs T

A

108

S

106

104

44.1kHz, 384f

S

102

100

Channel Separation (dB)

98

96kHz, 384f

S

96

–50 –25 0 25 50 75 100

Temperature (°C)

7