BURR-BROWN PCM3500 User Manual

®

For most current data sheet and other product

information, visit www.burr-brown.com

Low Voltage, Low Power, 16-Bit, Mono

PCM3500

PCM3500

VOICE/MODEM CODEC

TM

FEATURES

● 16-BIT DELTA-SIGMA DAC AND ADC

● DESIGNED FOR MODEM ANALOG FRONT END:

Supports up to 56kbps Operation

● ANALOG PERFORMANCE:

Sampling Frequency: 7.2kHz to 26kHz
Dynamic Range: 88dB (typ) at fS = 8kHz, fIN = 1kHz

● SYSTEM CLOCK: 512f

S

● MASTER OR SLAVE OPERATION

● ON-CHIP CRYSTAL OSCILLATOR CIRCUIT

● ADC-TO-DAC LOOP-BACK MODE

● TIME SLOT MODE SUPPORTS UP TO

FOUR CODECs ON A SINGLE SERIAL
INTERFACE

● POWER-DOWN MODE: 60µA (typ)

DESCRIPTION

The PCM3500 is a low cost, 16-bit CODEC designed
for modem Analog Front End (AFE) and speech pro­cessing applications. The PCM3500’s low power op­eration from +2.7V to +3.6V power supplies, along
with an integrated power-down mode, make it ideal for
portable applications.

The PCM3500 integrates all of the functions needed for
a modem or voice CODEC, including delta-sigma

● POWER SUPPLY: Single +2.7V to +3.6V

● SMALL PACKAGE: SSOP-24

APPLICATIONS

● SOFTWARE MODEMS FOR:

Personal Digital Assistant
Notebook and Hand-Held PCs
Set-Top Box
Digital Television
Embedded Systems

● PORTABLE VOICE RECORDER/PLAYER

● SPEECH RECOGNITION/SYNTHESIS

● TELECONFERENCING PRODUCTS

digital-to-analog and analog-to-digital converters, in­put anti-aliasing filter, digital high-pass filter for DC
blocking, and an output low-pass filter. The synchro­nous serial interface provides for a simple, or glue-free
interface to popular DSP and RISC processors. The
serial interface also supports Time Division Multiplex­ing (TDM), allowing up to four CODECs to share a
single 4-wire serial bus.

SBAS117

V

IN

AGND

V

1

REF

V

COM

V

2

REF

V

OUT

AGND

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/ • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]

© 1999 Burr-Brown Corporation PDS-1524B Printed in U.S.A. February, 2000

AAF HPF

Reference

SMF

∆Σ

Modulator

(ADC)

Multi-Level

DAC

AGND V

V

CC

Power

DGND

Decimation

Digital Filter

Loop

Serial I/O Interface

Interpolation
Digital Filter

Mode Control

M/S

HPFD TSC

Clock
Gen/
OSC

XTIXTOLOOP

DD

∆Σ

Modulator

PDWN

1 PCM3500

FS

BCK

DIN

DOUT

FSO

SCKIO

®

SPECIFICATIONS

All specifications at +25°C, VDD = V

PARAMETER CONDITIONS MIN TYP MAX UNITS
RESOLUTION 16 Bits

DATA FORMAT

Serial Data Interface Format DSP Format
Serial Data Bit Length 16 Bits
Serial Data Format
Sampling Frequency, f

S

System Clock Frequency, 512f

DIGITAL INPUT/OUTPUT

Logic Family CMOS
Input Logic Level: V

Input Logic Current: I

Output Logic Level: V

(1)

IH

(1)

V

IL

(2)

IN

(3)

I

IN

(4)

OH

(4)

V

OL

ADC CHARACTERISTICS
DC ACCURACY

Input Voltage 0.6 V
Gain Error ±2 ±5 % of FSR
Offset Error High-Pass Filter Disabled ±2 % of FSR
Input Resistance 50 kΩ

AC ACCURACY

THD+N f
Dynamic Range Without A-Weighting 82 88 dB

Signal-to-Noise Ratio Without A-Weighting 82 88 dB
Crosstalk DAC Channel Idle, 0dB Input 80 85 dB
Passband Ripple (internal HPF enabled) 0.0002f
Passband Ripple (internal HPF disabled) 0fS to 0.425f
Roll-Off at 0.00002f
Roll-Off at 0.56f

S

S

Stopband Rejection 0.58fS to f
Group Delay 18/f

DAC CHARACTERISTICS
DC ACCURACY

Output Voltage 0.6 V
Gain Error ±1 ±5 % of FSR
Offset Error High Pass Filter Disabled ±1 % of FSR
Load Resistance 10 kΩ

AC ACCURACY

THD+N f
Dynamic Range Without A-Weighted 84 92 dB
Signal-to-Noise Ratio Without A-Weighted 84 92 dB
Crosstalk ADC Channel Idle, 0dB Input 84 92 dB
Passband Ripple 0f
Group Delay 12/f

POWER SUPPLY REQUIREMENTS

Voltage Range VCC, V
Supply Current, I
Total Supply Current in Power-Down Mode V

+ I

CC

DD

Total Power Dissipation V

TEMPERATURE RANGE

Operating –25 +85 °C
Storage –55 +125 °C
Thermal Resistance,

Θ

JA

= 3.3V, fS = 8kHz, and nominal system clock (XTI) = 512fS, unless otherwise noted. Measurement band is 100Hz to 0.425fS.

CC

PCM3500E

MSB-First, Binary Two’s Complement

ADC and DAC 7.2 8 26 kHz

S

3.686 4.096 13.312 MHz

0.7 • V

DD

0.3 • V

DD

±1 µA

100 µA

I

= –1mA V

OUT

I

= +1mA 0.3 VDC

OUT

= 1kHz, VIN = –0.5dB –85 –80 dB

IN

to 0.425f

S

S

S

– 0.3 VDC

DD

CC

±0.05 dB
±0.05 dB

High-Pass Filter Enabled –3 dB
High-Pass Filter Enabled –30 dB

S

= 1kHz, V

IN

S

VCC = 3.3V 9 12 mA

= VDD = 3.3V, XTI Stopped 60 µA

CC

= VDD = 3.3V 30 40 mW

CC

= 0dB –90 –82 dB

OUT

to 0.425f

S

DD

2.7 3.3 3.6 VDC

–65 dB

S

CC

4m sec

±0.4 dB

S

4m sec

100 °C/W

VDC
VDC

Vp-p

Vp-p

NOTES: (1) Pins 6, 7, 8, 9, 10, 15, 17, 18, 19, 20 (M/S, TSC, BCK, FS, DIN, SCKIO, XTI, HPFD, LOOP, PDWN). (2) Pins 8, 9, 10, 15, 17 (BCK, FS, DIN, SCKIO
(Schmitt-Trigger input) XTI. (3) Pins 6, 7, 18, 19, 20 (M/S, TSC, HPFD, LOOP, PDWN; Schmitt-Trigger input with internal pull-down). (4) Pins 8, 9, 11, 12, 15,
16 (BCK, FS, DOUT, FSO, SCKIO, XTO).

®

PCM3500

2

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, +VDD, +VCC............................................................. +6.5V

Supply Voltage Differences...............................................................±0.1V

GND Voltage Differences..................................................................±0.1V

Digital Input Voltage................................................... –0.3V to V

Input Current (any pins except supply) ........................................... ±10mA

Power Dissipation .......................................................................... 300mW

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

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

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

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

(reflow, 10s) ................................................................................ +235°C

DD

+ 0.3V

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

ELECTROSTATIC
DISCHARGE SENSITIVITY

published specifications.

PACKAGE/ORDERING INFORMATION

PACKAGE SPECIFIED

PRODUCT PACKAGE NUMBER RANGE MARKING NUMBER

DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT

PCM3500E 24-Lead SSOP 338 –25°C to +85°C PCM3500E PCM3500E Rails

" " " " " PCM3500E/2K Tape and Reel

NOTES: (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 2,000 pieces
of “PCM3500E/2K” will get a single 2000-piece Tape and Reel.

(1)

MEDIA

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.

3 PCM3500

®

PIN CONFIGURATION

Top View SSOP

PCM3500

1

V

COM

2

V

1

REF

3

V

2

REF

4

V

IN

5

AGND

6

M/S

7

TSC

8

BCK

9

FS

10

DIN

11

DOUT

12

FSO

V

AGND

V

OUT

AGND

PDWN

LOOP
HPFD

XTI

XTO

SCKIO

DGND

V

24

CC

23
22
21
20
19
18
17
16
15
14
13

DD

PIN ASSIGNMENTS

PIN NAME I/O DESCRIPTION

1V
2V
3V
4V
5 AGND — Analog Ground for the ADC Input Signal.
6 M/S IN Master/Slave Select. This pin is used to determine the operating mode for the serial interface. A logic ‘0’ on this pin selects the Slave

7 TSC IN Time Slot Mode Control. This pin is used to select the time slot operating mode. A logic ‘0’ on this pin disables Time Slot Mode. A

8 BCK I/O Bit Clock. This pin serves as the bit (or shift) clock for the serial interface. This pin is an input in Slave Mode and an output in Master

9 FS I/O Frame Sync. This pin serves as the frame synchronization clock for the serial interface. This pin is an input in Slave Mode and an

10 DIN IN Serial Data Input. This pin is used to write 16-bit data to the DAC.
11 DOUT OUT Serial Data Output. The ADC outputs 16-bit data on this pin.
12 FSO OUT Frame Sync Output. Active only when Time Slot Mode is enabled. This pin is set to a high impedance state when Time Slot mode

13 V

14 DGND — Digital Ground. Internally connected through the substrate to analog ground.
15 SCKIO I/O System Clock Input/Output. This pin is a system clock output when using the crystal oscillator or XTI as the system clock input; when

16 XTO OUT Crystal Oscillator Output.
17 XTI IN Crystal Oscillator Input or an External System Clock Input.
18 HPFD IN High-Pass Filter Disable. When this pin is set to a logic ‘1’, the HPF function in the ADC is disabled.
19 LOOP IN ADC-to-DAC Loop-Back Control. When this pin is set to logic ‘1’, the ADC data is fed to the DAC input.
20 PDWN IN Power Down and Reset Control. When this pin is logic ‘0’, Power-Down Mode is enabled. The PCM3500 is reset on the rising edge

21 AGND — Analog Ground for the DAC Output Signal.
22 V
23 AGND — Analog Ground. This is the ground for the internal analog circuitry.
24 V

NOTES: (1) Schmitt-Trigger input. (2) Schmitt-Trigger input with an internal pull-down resistor. (3) Tri-state output in Time Slot Mode.

OUT Common-Mode Voltage (0.5V

COM

1 — Decouple Pin for Reference Voltage 1 (0.99VCC). This pin should be connected to ground through a capacitor.

REF

2 — Decouple Pin for Reference Voltage 2 (0.2VCC). This pin should be connected to ground through a capacitor.

REF

IN Analog Input for the ADC.

IN

Mode. A logic ‘1’ on this pin selects the Master Mode.

logic ‘1’ on this pin enables Time Slot Mode.

(1)

Mode.

output in Master Mode.

. This pin should be connected to ground through a capacitor.

CC)

(2)

(2)

(1)

(1)

(3)

is disabled (TSC = 0).

— Digital Power Supply. Used to power the digital section of the ADC and DAC, as well as the serial interface and mode control logic.

DD

This pin is not internally connected to V

XTI is connected to ground, this pin is a system clock input.

of this signal.

OUT Analog Output from the DAC Output Filter.

OUT

— Analog Power Supply. Used to power the analog circuitry of the ADC and DAC.

CC

(2)

.

CC

(1)

(2)

(2)

®

PCM3500

4

TYPICAL PERFORMANCE CURVES
DAC SECTION

DIGITAL FILTER

INTERPOLATION FILTER FREQUENCY RESPONSE

0
–10
–20
–30
–40
–50
–60

Amplitude (dB)

–70
–80
–90

–100

0

ANALOG FILTER

1

Normalized Frequency (• f

23

4

)

S

INTERPOLATION FILTER

0.2

0.0

–0.2

–0.4

Amplitude (dB)

–0.6

–0.8

–1.0

PASSBAND RIPPLE CHARACTERISTICS

0 0.1 0.2 0.3 0.4 0.5

Normalized Frequency (• fS Hz)

OUTPUT FILTER FREQUENCY RESPONSE

0
–10
–20
–30
–40
–50
–60

Amplitude (dB)

–70
–80
–90

–100

100 1k 10k 100k 1M 10M

STOPBAND CHARACTERISTICS

Frequency (Hz)

0
–1
–2
–3
–4
–5
–6
–7

Amplitude (dB)

–8
–9

–10

OUTPUT FILTER FREQUENCY RESPONSE

PASSBAND CHARACTERISTICS

100101 1k 10k 100k

Frequency (Hz)

5 PCM3500

®

TYPICAL PERFORMANCE CURVES (Cont.)

TA = +25°C, VCC = VDD = +3.3V, fS = 8kHz, and f

= 1kHz, unless otherwise specified.

SIGNAL

DAC SECTION

DAC OUTPUT SPECTRA

0

–20

–40

–60

–80

Amplitude (dB)

–100

–120

–140

0

–20

–40

–60

THD+N (dB)

–80

–100

DAC OUTPUT SPECTRUM (–0dB, N = 8192)

12340

Frequency (kHz)

TOTAL HARMONIC DISTORTION + NOISE

vs SIGNAL NOISE

THD+N fluctuates with signal level

as harmonics are limited to second

and third components.

–84 –72 –60 –48 –36 –24 –12 0–96

Signal Level (dB)

0

–20

–40

–60

–80

Amplitude (dB)

–100

–120

–140

0

–20

–40

–60

–80

Amplitude (dB)

–100

–120

–140

DAC OUTPUT SPECTRUM (–60dB, N = 8192)

12340

Frequency (kHz)

DAC OUT-OF-BAND NOISE SPECTRUM

(BPZ, N = 2048)

8 162432 404856640

Frequency (kHz)

®

PCM3500

6

TYPICAL PERFORMANCE CURVES (Cont.)

Dynamic Range and SNR (dB)

DYNAMIC RANGE AND SIGNAL-TO-NOISE RATIO

vs TEMPERATURE

(T

A

= –25°C to +85°C)

Temperature (°C)

96

94

92

90

88

–25 0 25 50 75 100–50

Dynamic Range

SNR

Dynamic Range and SNR (dB)

DYNAMIC RANGE AND SIGNAL-TO-NOISE RATIO

vs SUPPLY VOLTAGE

(V

CC

= VDD = +2.7V to +3.6V)

Supply Voltage (V)

96

94

92

90

88

2.7 3.0 3.3 3.6 3.92.4

Dynamic Range

SNR

Dynamic Range and SNR (dB)

DYNAMIC RANGE AND SIGNAL-TO-NOISE RATIO

vs SAMPLING FREQUENCY

(f

S

= 8kHz to 26kHz)

f

S

(kHz)

96

94

92

90

88

81624320

BW = 3.4kHz

Dynamic Range

SNR

DAC SECTION

DAC CHARACTERISTICS vs TEMPERATURE, SUPPLY, AND SAMPLING FREQUENCY

TOTAL HARMONIC DISTORTION + NOISE

–88

–90

–92

THD+N at –0dB (dB)

–94

–96

–88

–90

–25 0 25 50 75 100–50

TOTAL HARMONIC DISTORTION + NOISE

vs TEMPERATURE

(T

= –25°C to +85°C)

A

Temperature (°C)

vs SUPPLY VOLTAGE

(V

= VDD = +2.7V to +3.6V)

CC

–92

THD+N at –0dB (dB)

–94

–96

–88

–90

–92

THD+N at –0dB (dB)

–94

–96

2.7 3.0 3.3 3.6 3.92.4

TOTAL HARMONIC DISTORTION + NOISE

Supply Voltage (V)

vs SAMPLING FREQUENCY

(f

= 8kHz to 26kHz)

S

81624320

f

(kHz)

S

BW = 3.4kHz

®

7 PCM3500

TYPICAL PERFORMANCE CURVES
ADC SECTION

DIGITAL FILTER

0
–20
–40
–60
–80

–100
–120

Amplitude (dB)

–140
–160
–180
–200

0.2

0.0

–0.2

–0.4

Amplitude (dB)

–0.6

–0.8

–1.0

DECIMATION FILTER FREQUENCY RESPONSE

81624320

Normalized Frequency (• f

DECIMATION FILTER

PASSBAND RIPPLE CHARACTERISTICS

0.1 0.2 0.3 0.4 0.50
Normalized Frequency (• f

S

S

Hz)

Hz)

STOPBAND ATTENUATION CHARACTERISTICS

0
–10
–20
–30
–40
–50
–60

Amplitude (dB)

–70
–80
–90

–100

0
–1
–2
–3
–4
–5
–6

Amplitude (dB)

–7
–8
–9

–10

0.45 0.46 0.47 0.48 0.49 0.50 0.51 0.52 0.53 0.54 0.55

DECIMATION FILTER

0.2 0.4 0.6 0.8 1.00
Normalized Frequency (• f

DECIMATION FILTER TRANSITION

BAND CHARACTERISTICS

–4.13dB at 0.5 • f

Normalized Frequency (• f

S

S

Hz)

Hz)

S

0
–10
–20
–30
–40
–50
–60

Amplitude (dB)

–70
–80
–90

–100

HIGH-PASS FILTER FREQUENCY RESPONSE

STOPBAND CHARACTERISTICS

0.1 0.2 0.3 0.4 0.50
Normalized Frequency (• f

®

/1000 Hz)

S

PCM3500

8

0.0
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6

Amplitude (dB)

–0.7
–0.8
–0.9

–10

HIGH-PASS FILTER FREQUENCY RESPONSE

PASSBAND CHARACTERISTICS

12340

Normalized Frequency (• f

/1000 Hz)

S

TYPICAL PERFORMANCE CURVES (Cont.)

ANTI-ALIASING FILTER

PASSBAND CHARACTERISTICS

Frequency (Hz)

Amplitude (dB)

0
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6
–0.7
–0.8
–0.9
–1.0

1k100101 10k 100k

TA = +25°C, VCC = VDD = +3.3V, fS = 8kHz, and f

= 1kHz, unless otherwise specified.

SIGNAL

ADC SECTION

ANALOG FILTER

ANTI-ALIASING FILTER

0

–5
–10
–15
–20
–25
–30

Amplitude (dB)

–35
–40
–45
–50

ADC OUTPUT SPECTRA

STOPBAND CHARACTERISTICS

1k100 10k 100k 1M 10M

Frequency (Hz)

0

–20

–40

–60

–80

Amplitude (dB)

–100

–120

–140

ADC OUTPUT SPECTRUM (–0.5dB, N = 8192)

12340

Frequency (kHz)

0

–20

–40

–60

THD+N (dB)

–80

–100

0

–20

–40

–60

–80

Amplitude (dB)

–100

–120

–140

TOTAL HARMONIC DISTORTION + NOISE

THD+N fluctuates with signal level

as harmonics are limited to second

and third components.

–84 –72 –60 –48 –36 –24 –12 0–96

vs SIGNAL NOISE

Signal Level (dB)

9 PCM3500

ADC OUTPUT SPECTRUM (–60dB, N = 8192)

12340

Frequency (kHz)

®