TEXAS INSTRUMENTS PCM3501 Technical data

®

PCM3501

PCM3501

Low Voltage, Low Power, 16-Bit, Mono

VOICE/MODEM CODEC

TM

FEATURES

● 16-BIT DELTA-SIGMA DAC AND ADC

● DIFFERENTIAL INPUT AND OUTPUT

● 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

DESCRIPTION

The PCM3501 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 PCM3501 integrates all of the functions needed for
a modem or voice CODEC, including delta-sigma

● POWER-DOWN MODE: 60µA (typ)

● SINGLE +2.7V TO +3.6V POWER SUPPLY

● SMALL PACKAGE: 24-Lead SSOP

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.

SBAS137

V

IN+

V

IN–

V

1

REF

V

COM

V

2

REF

V

OUT+

V

OUT–

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-1569A Printed in U.S.A. December, 1999

AAF HPF

Reference

SMF

∆Σ

Modulator

(ADC)

Multi-Level

DAC

V

AGND 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 PCM3501

FS

BCK

DIN

DOUT

FSO

SCKIO

®

SPECIFICATIONS

All specifications at TA = +25°C, VDD = V
Measurement band is 100Hz to 0.425f

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
System Clock Frequency, 512f

S

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

REFERENCE

Voltage Common: V

Load Impedance: R

V

COM

COM

COM

(5)

ADC CHARACTERISTICS
DC ACCURACY

Input Voltage (Differential) V
Gain Error ±2 ±5 % of FSR
Offset Error HPF OFF ±2 % of FSR
Input Resistance 50 kΩ

AC ACCURACY

(6)

THD+N fIN = 1kHz, VIN = –0.5dB –85 –80 dB
Dynamic Range 82 88 dB
Signal-to-Noise Ratio 82 88 dB
Crosstalk DAC Channel Idle, 0dB Input 78 82 dB
Passband Ripple HPF ON, 0.0002f

Roll-Off HPF ON, at 0.00002f

Stopband Rejection 0.58f
Group Delay 18/f

DAC CHARACTERISTICS
DC ACCURACY

Output Voltage (Differential) V
Gain Error ±1 ±5 % of FSR
Offset Error ±1 % of FSR
Load Resistance 10 kΩ

AC ACCURACY

(6)

THD+N fIN = 1kHz, V
Dynamic Range 84 92 dB
Signal-to-Noise Ratio 84 94 dB
Crosstalk ADC Channel Idle, –0.5dB Input 84 92 dB
Passband Ripple 0f
Group Delay 12/f

POWER SUPPLY REQUIREMENTS

Voltage Range V
Supply Current in operation mode V
Total Supply Current in Power-Down Mode V
Total Power Dissipation V

TEMPERATURE RANGE

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

θ

JA

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,
XTI (Schmitt-Trigger input). (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). (5) If V

with resistance of R

V

CC

/10 or lower. (6) fIN = 1kHz, Audio Precision System II, RMS mode with 3.4kHz LPF, 100Hz HPF.

COM

= 3.3V, fS = 8kHz, and nominal system clock (XTI) = 512fS, and differntial input and output mode, unless otherwise noted.

CC

.

S

PCM3501E

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

VIN = BPZ, V

= VIN+ – VIN– 1.2V

IN

HPF OFF, 0f

HPF ON, at 0.56f

= V

OUT

S

CC

= VDD = 3.3V, XTI Stopped 60 µA

CC

= VDD = 3.3V 30 40 mW

CC

= BPZ 0.5V

OUT

to 0.425f

S

to 0.425f

S

to f

S

+ – V

OUT

OUT

to 0.425f

, V

CC

DD

= VDD =3.3V 9 12 mA

S

S

S

S

S

– 1.2 V

OUT

= 0dB –90 –82 dB

S

– 0.3 VDC

DD

100 kΩ

CC

CC

±0.05 dB
±0.05 dB

–3 dB
–30 dB
–65 dB

S

CC

4m sec

±0.4 dB

S

4m sec

2.7 3.3 3.6 VDC

24-pin SSOP 100 °C/W

load impedance (R

COM

) is lower than 100kΩ, the user needs to connect external resistors to AGND and

COM

VDC
VDC

V

Vp-p

Vp-p

®

PCM3501

2

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, +VDD, +V
Supply Voltage Differences
GND Voltage Differences

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

NOTES: (1) VCC, VDD. (2) Among VCC, VDD. (3) Among AGND, DGND.

(1)

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

CC

(2)

........................................................... ±0.1V

(3)

....................................................................................... ±0.1V

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
published specifications.

ELECTROSTATIC
DISCHARGE SENSITIVITY

PACKAGE/ORDERING INFORMATION

PACKAGE SPECIFIED

PRODUCT PACKAGE NUMBER RANGE MARKING NUMBER

DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT

PCM3501E 24-Lead SSOP 338 –25°C to +85°C PCM3501E PCM3501E Rails

" " " " " PCM3501E/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 2,000 pieces
of “PCM3501E/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 PCM3501

®

PIN CONFIGURATION

Top View SSOP

PCM3501

1

V

COM

2

V

1

REF

3

V

2

REF

4

V

IN+

5

V

IN–

6

M/S

7

TSC

8

BCK

9

FS

10

DIN

11

DOUT

12

FSO

V

AGND

V

OUT+

V

OUT–

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
5V
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 F S 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 V
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 Non-Inverting input to on-chip AFE.

IN+

IN Inverting input to on-chip AFE.

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 Inverting output.

OUT–

OUT Non-inverting output.

OUT+

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

CC

(2)

.

CC

(1)

(2)

(2)

®

PCM3501

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
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6
–0.7

Amplitude (dB)

–0.8
–0.9
–1.0

OUTPUT FILTER FREQUENCY RESPONSE

PASSBAND CHARACTERISTICS

100101 1k 10k 100k

Frequency (Hz)

5 PCM3501

®

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 LEVEL

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)

®

PCM3501

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)

100

98

96

94

92

–25 0 25 50 75 100–50

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)

100

98

96

94

92

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

DYNAMIC RANGE AND SIGNAL-TO-NOISE RATIO

100

98

vs SUPPLY VOLTAGE

(V

= VDD = +2.7V to +3.6V)

CC

SNR

–92

VOUT+

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

= 8kHz to 26kHz)

(f

S

81624320

(kHz)

f

S

BW = 3.4kHz

96

94

Dynamic Range and SNR (dB)

92

2.7 3.0 3.3 3.6 3.92.4

Dynamic Range

Supply Voltage (V)

7 PCM3501

®

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

PCM3501

8

0.0
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6

Amplitude (dB)

–0.7
–0.8
–0.9
–1.0

HIGH-PASS FILTER FREQUENCY RESPONSE

PASSBAND CHARACTERISTICS

12340

Normalized Frequency (• f

/1000 Hz)

S