Burr Brown PCM3501E, PCM3501E-2K Datasheet

®

1 PCM3501

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

© 1999 Burr-Brown Corporation PDS-1569A Printed in U.S.A. December, 1999

PCM3501

®

Low Voltage, Low Power, 16-Bit, Mono

VOICE/MODEM CODEC

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

TM

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.

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]

● POWER-DOWN MODE: 60µA (typ)

● SINGLE +2.7V TO +3.6V POWER SUPPLY

● SMALL PACKAGE: 24-Lead SSOP

PCM3501

Interpolation
Digital Filter

Mode Control

Decimation

Digital Filter

Reference

AAF HPF

M/S

HPFD TSC

XTIXTOLOOP

V

REF

1

V

COM

V

REF

2

V

IN+

V

IN–

Serial I/O Interface

PDWN

Power

DGND

AGND V

DD

V

CC

Loop

FS

BCK

DIN

DOUT

FSO

SCKIO

Clock

Gen/
OSC

∆Σ

Modulator

(ADC)

∆Σ

Modulator

SMF

V

OUT+

V

OUT–

Multi-Level

DAC

®

2

PCM3501

SPECIFICATIONS

All specifications at TA = +25°C, VDD = V

CC

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

Measurement band is 100Hz to 0.425f

S

.

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

COM

load impedance (R

COM

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

V

CC

with resistance of R

COM

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

MSB-First, Binary Two’s Complement

PCM3501E

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

ADC and DAC 7.2 8 26 kHz

System Clock Frequency, 512f

S

3.686 4.096 13.312 MHz

DIGITAL INPUT/OUTPUT

Logic Family CMOS
Input Logic Level: V

IH

(1)

0.7 • V

DD

VDC

V

IL

(1)

0.3 • V

DD

VDC

Input Logic Current: I

IN

(2)

±1 µA

I

IN

(3)

100 µA

Output Logic Level: V

OH

(4)

I

OUT

= –1mA V

DD

– 0.3 VDC

V

OL

(4)

I

OUT

= +1mA 0.3 VDC

REFERENCE

Voltage Common: V

COM

VIN = BPZ, V

OUT

= BPZ 0.5V

CC

V

V

COM

Load Impedance: R

COM

(5)

100 kΩ

ADC CHARACTERISTICS
DC ACCURACY

Input Voltage (Differential) V

IN

= VIN+ – VIN– 1.2V

CC

Vp-p
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

S

to 0.425f

S

±0.05 dB

HPF OFF, 0f

S

to 0.425f

S

±0.05 dB

Roll-Off HPF ON, at 0.00002f

S

–3 dB

HPF ON, at 0.56f

S

–30 dB

Stopband Rejection 0.58f

S

to f

S

–65 dB

Group Delay 18/f

S

4m sec

DAC CHARACTERISTICS
DC ACCURACY

Output Voltage (Differential) V

OUT

= V

OUT

+ – V

OUT

– 1.2 V

CC

Vp-p
Gain Error ±1 ±5 % of FSR
Offset Error ±1 % of FSR
Load Resistance 10 kΩ

AC ACCURACY

(6)

THD+N fIN = 1kHz, V

OUT

= 0dB –90 –82 dB
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

S

to 0.425f

S

±0.4 dB

Group Delay 12/f

S

4m sec

POWER SUPPLY REQUIREMENTS

Voltage Range V

CC

, V

DD

2.7 3.3 3.6 VDC

Supply Current in operation mode V

CC

= VDD =3.3V 9 12 mA

Total Supply Current in Power-Down Mode V

CC

= VDD = 3.3V, XTI Stopped 60 µA

Total Power Dissipation V

CC

= VDD = 3.3V 30 40 mW

TEMPERATURE RANGE

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

θ

JA

24-pin SSOP 100 °C/W

®

3 PCM3501

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.

Supply Voltage, +VDD, +V

CC

(1)

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

Supply Voltage Differences

(2)

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

GND Voltage Differences

(3)

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

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

DD

+ 0.3V

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

ABSOLUTE MAXIMUM RATINGS

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 RANGE MARKING NUMBER

(1)

MEDIA

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.

PACKAGE/ORDERING INFORMATION

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

®

4

PCM3501

PIN CONFIGURATION

Top View SSOP

PIN NAME I/O DESCRIPTION

1V

COM

OUT Common-Mode Voltage (0.5V

CC)

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

2V

REF

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

3V

REF

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

4V

IN+

IN Non-Inverting input to on-chip AFE.

5V

IN–

IN Inverting input to on-chip AFE.

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

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

(2)

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

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

(2)

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

Mode.

(1)

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

output in Master Mode.

(1)

10 DIN IN Serial Data Input. This pin is used to write 16-bit data to the DAC.

(1)

11 DOUT OUT Serial Data Output. The ADC outputs 16-bit data on this pin.

(3)

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

is disabled (TSC = 0).

13 V

DD

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

This pin is not internally connected to V

CC

.
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

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

(1)

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.

(2)

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.

(2)

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

of this signal.

(2)

21 V

OUT–

OUT Inverting output.

22 V

OUT+

OUT Non-inverting output.
23 AGND — Analog Ground. This is the ground for the internal analog circuitry.
24 V

CC

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

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

PIN ASSIGNMENTS

V

COM

V

REF

1

V

REF

2

V

IN+

V

IN–

M/S
TSC
BCK
FS
DIN
DOUT
FSO

V

CC

AGND

V

OUT+

V

OUT–

PDWN

LOOP
HPFD

XTI

XTO

SCKIO

DGND

V

DD

1
2
3
4
5
6
7
8

9
10
11
12

24
23
22
21
20
19
18
17
16
15
14
13

PCM3501

®

5 PCM3501

TYPICAL PERFORMANCE CURVES

INTERPOLATION FILTER

PASSBAND RIPPLE CHARACTERISTICS

0.2

0.0

–0.2

–0.4

–0.6

–0.8

–1.0

0 0.1 0.2 0.3 0.4 0.5

Amplitude (dB)

Normalized Frequency (• fS Hz)

OUTPUT FILTER FREQUENCY RESPONSE

STOPBAND CHARACTERISTICS

Frequency (Hz)

Amplitude (dB)

0
–10
–20
–30
–40
–50
–60
–70
–80
–90

–100

100 1k 10k 100k 1M 10M

ANALOG FILTER

DAC SECTION

DIGITAL FILTER

OUTPUT FILTER FREQUENCY RESPONSE

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

100101 1k 10k 100k

Amplitude (dB)

INTERPOLATION FILTER FREQUENCY RESPONSE

Normalized Frequency (• f

S

)

0
–10
–20
–30
–40
–50
–60
–70
–80
–90

–100

0

1

23

4

®

6

PCM3501

TYPICAL PERFORMANCE CURVES (Cont.)

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

SIGNAL

= 1kHz, unless otherwise specified.

DAC OUTPUT SPECTRUM (–0dB, N = 8192)

Frequency (kHz)

Amplitude (dB)

0

–20

–40

–60

–80

–100

–120

–140

12340

DAC OUTPUT SPECTRUM (–60dB, N = 8192)

Frequency (kHz)

Amplitude (dB)

0

–20

–40

–60

–80

–100

–120

–140

12340

DAC OUT-OF-BAND NOISE SPECTRUM

(BPZ, N = 2048)

Frequency (kHz)

Amplitude (dB)

0

–20

–40

–60

–80

–100

–120

–140

8 162432 404856640

DAC SECTION

DAC OUTPUT SPECTRA

TOTAL HARMONIC DISTORTION + NOISE

vs SIGNAL LEVEL

Signal Level (dB)

THD+N (dB)

0

–20

–40

–60

–80

–100

–84 –72 –60 –48 –36 –24 –12 0–96

THD+N fluctuates with signal level
as harmonics are limited to second

and third components.

®

7 PCM3501

TYPICAL PERFORMANCE CURVES (Cont.)

DAC SECTION

DAC CHARACTERISTICS vs TEMPERATURE, SUPPLY, AND SAMPLING FREQUENCY

THD+N at –0dB (dB)

TOTAL HARMONIC DISTORTION + NOISE

vs TEMPERATURE

(T

A

= –25°C to +85°C)

Temperature (°C)

–88

–90

–92

–94

–96

–25 0 25 50 75 100–50

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

THD+N at –0dB (dB)

TOTAL HARMONIC DISTORTION + NOISE

vs SUPPLY VOLTAGE

(V

CC

= VDD = +2.7V to +3.6V)

Supply Voltage (V)

–88

–90

–92

–94

–96

2.7 3.0 3.3 3.6 3.92.4

THD+N at –0dB (dB)

TOTAL HARMONIC DISTORTION + NOISE

vs SAMPLING FREQUENCY

(f

S

= 8kHz to 26kHz)

f

S

(kHz)

–88

–90

–92

–94

–96

81624320

BW = 3.4kHz

VOUT+

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

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)

100

98

96

94

92

2.7 3.0 3.3 3.6 3.92.4

Dynamic Range

SNR

®

8

PCM3501

TYPICAL PERFORMANCE CURVES
ADC SECTION

DIGITAL FILTER

DECIMATION FILTER FREQUENCY RESPONSE

Normalized Frequency (• f

S

Hz)

Amplitude (dB)

0
–20
–40
–60
–80

–100
–120
–140
–160
–180
–200

81624320

DECIMATION FILTER

STOPBAND ATTENUATION CHARACTERISTICS

Normalized Frequency (• f

S

Hz)

Amplitude (dB)

0
–10
–20
–30
–40
–50
–60
–70
–80
–90

–100

0.2 0.4 0.6 0.8 1.00

DECIMATION FILTER

PASSBAND RIPPLE CHARACTERISTICS

Normalized Frequency (• f

S

Hz)

Amplitude (dB)

0.2

0.0

–0.2

–0.4

–0.6

–0.8

–1.0

0.1 0.2 0.3 0.4 0.50

DECIMATION FILTER TRANSITION

BAND CHARACTERISTICS

Normalized Frequency (• f

S

Hz)

Amplitude (dB)

0
–1
–2
–3
–4
–5
–6
–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

–4.13dB at 0.5 • f

S

HIGH-PASS FILTER FREQUENCY RESPONSE

STOPBAND CHARACTERISTICS

Normalized Frequency (• f

S

/1000 Hz)

Amplitude (dB)

0
–10
–20
–30
–40
–50
–60
–70
–80
–90

–100

0.1 0.2 0.3 0.4 0.50

HIGH-PASS FILTER FREQUENCY RESPONSE

PASSBAND CHARACTERISTICS

Normalized Frequency (• f

S

/1000 Hz)

Amplitude (dB)

0.0
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6
–0.7
–0.8
–0.9
–1.0

12340