Datenblatt-pdf.com


PCM3501 Schematic ( PDF Datasheet ) - Burr-Brown Corporation

Teilenummer PCM3501
Beschreibung Low Voltage/ Low Power/ 16-Bit/ Mono VOICE/MODEM CODEC
Hersteller Burr-Brown Corporation
Logo Burr-Brown Corporation Logo 




Gesamt 24 Seiten
PCM3501 Datasheet, Funktion
®
PCM3501
PCM3501
Low Voltage, Low Power, 16-Bit, Mono
TM VOICE/MODEM CODEC
FEATURES
q 16-BIT DELTA-SIGMA DAC AND ADC
q DIFFERENTIAL INPUT AND OUTPUT
q DESIGNED FOR MODEM ANALOG FRONT END:
Supports up to 56kbps Operation
q ANALOG PERFORMANCE:
Sampling Frequency: 7.2kHz to 26kHz
Dynamic Range: 88dB (typ) at fS = 8kHz, fIN = 1kHz
q SYSTEM CLOCK: 512fS
q MASTER OR SLAVE OPERATION
q ON-CHIP CRYSTAL OSCILLATOR CIRCUIT
q ADC-TO-DAC LOOP-BACK MODE
q TIME SLOT MODE SUPPORTS UP TO
FOUR CODECs ON A SINGLE SERIAL
INTERFACE
q POWER-DOWN MODE: 60µA (typ)
q SINGLE +2.7V TO +3.6V POWER SUPPLY
q SMALL PACKAGE: 24-Lead SSOP
APPLICATIONS
q SOFTWARE MODEMS FOR:
Personal Digital Assistant
Notebook and Hand-Held PCs
Set-Top Box
Digital Television
Embedded Systems
q PORTABLE VOICE RECORDER/PLAYER
q SPEECH RECOGNITION/SYNTHESIS
q TELECONFERENCING PRODUCTS
DESCRIPTION
The PCM3501 is a low cost, 16-bit CODEC designed
for modem Analog Front End (AFE) and speech pro-
cessing applications. The PCM3500’s low power op-
eration 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
digital-to-analog and analog-to-digital converters, in-
put anti-aliasing filter, digital high-pass filter for DC
blocking, and an output low-pass filter. The synchro-
nous serial interface provides for a simple, or glue-free
interface to popular DSP and RISC processors. The
serial interface also supports Time Division Multiplex-
ing (TDM), allowing up to four CODECs to share a
single 4-wire serial bus.
VIN+
VIN–
VREF1
VCOM
VREF2
VOUT+
VOUT–
∆Σ
AAF Modulator
(ADC)
Reference
SMF
Multi-Level
DAC
Power
Decimation
Digital Filter
HPF
Loop
∆Σ
Modulator
Interpolation
Digital Filter
Mode Control
Clock
Gen/
OSC
FS
BCK
DIN
DOUT
FSO
SCKIO
VCC AGND DGND VDD PDWN
LOOP HPFD M/S TSC
XTO XTI
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 1999 Burr-Brown Corporation
PDS1-1569A
PPrinCtedMin U3.S5.A0. 1December, 1999
®






PCM3501 Datasheet, Funktion
TYPICAL PERFORMANCE CURVES (Cont.)
TA = +25°C, VCC = VDD = +3.3V, fS = 8kHz, and fSIGNAL = 1kHz, unless otherwise specified.
DAC SECTION
DAC OUTPUT SPECTRA
0
–20
–40
–60
–80
–100
–120
–140
0
DAC OUTPUT SPECTRUM (–0dB, N = 8192)
1 23
Frequency (kHz)
4
0
–20
–40
–60
–80
–100
–120
–140
0
DAC OUTPUT SPECTRUM (–60dB, N = 8192)
1 23
Frequency (kHz)
4
TOTAL HARMONIC DISTORTION + NOISE
vs SIGNAL LEVEL
0
–20
–40
–60
THD+N fluctuates with signal level
–80 as harmonics are limited to second
and third components.
–100
–96 –84 –72 –60 –48 –36 –24 –12
Signal Level (dB)
0
0
–20
–40
–60
–80
–100
–120
–140
0
DAC OUT-OF-BAND NOISE SPECTRUM
(BPZ, N = 2048)
8 16 24 32 40 48 56 64
Frequency (kHz)
®
PCM3501
6

6 Page









PCM3501 pdf, datenblatt
SYSTEM CLOCK AND RESET/
POWER DOWN
SYSTEM CLOCK INPUT AND OUTPUT
The PCM3501 requires a system clock for operating the
digital filters and delta-sigma data converters.
The system clock may be supplied from an external master
clock or generated using the on-chip crystal oscillator cir-
cuit. Figure 1 shows the required connections for external
and crystal clock operation. The system clock must operate
at 512 times the sampling frequency, fS, with sampling
frequencies from 7.2kHz to 26kHz. This gives an effective
system clock frequency range of 3.6864MHz to 13.312MHz.
Table I shows system clock frequencies for common sam-
pling frequencies.
For external clock operation, XTI (pin 17) or SCKIO (pin 15)
is driven by a master clock source. If SCKIO is used as the
system clock input, then XTI must be connected to ground.
SAMPLING FREQUENCY (kHz)
8
11.025
16
22.05
24
SYSTEM CLOCK FREQUENCY (MHz)
4.096
5.6448
8.192
11.2896
12.288
TABLE I. System Clock Frequencies for Common Sam-
pling Frequencies.
For either case, XTO (pin 16) should be left open. The system
clock source should be free of noise and exhibit low phase
jitter in order to obtain optimal dynamic performance from
the PCM3501. Figure 2 shows the system clock timing
requirements associated with an external master clock.
For crystal oscillator operation, a crystal is connected be-
tween XTI (pin 17) and XTO (pin 16), along with the
necessary load capacitors (10pF to 33pF per pin, as shown
in Figure 1). A fundamental-mode, parallel resonant crystal
is required.
External
Clock
SCKIO
SCKIO
SCKIO
XTI
External
XTI
Clock
RR
XTO
PCM3501
EXTERNAL CLOCK INPUT-SCKIO
(XTO must be open)
XTO
PCM3501
EXTERNAL CLOCK INPUT-XTI
(XTO must be open)
C1 Crystal XTI
C2
XTO
R
C1, C2 = 10pF to 33pF
PCM3501
CRYSTAL RESONATOR
CONNECTION
FIGURE 1. System Clock Generation.
XTI
or
SCKIO
"H"
"L"
tCLKIH
tCLKIL
1/512fS
0.7VDD
0.3VDD
System Clock Pulse Width HIGH tCLKIH
System Clock Pulse Width LOW tCLKIL
20ns (min)
20ns (min)
FIGURE 2. External System Clock Timing Requirements.
®
PCM3501
12

12 Page





SeitenGesamt 24 Seiten
PDF Download[ PCM3501 Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
PCM3500Low Voltage Low Power 16-Bit Mono SoundPlus VOICE/MODEM CODECTexas Instruments
Texas Instruments
PCM3501Low Voltage/ Low Power/ 16-Bit/ Mono VOICE/MODEM CODECBurr-Brown Corporation
Burr-Brown Corporation
PCM3501Low Voltage Low Power 16-Bit Mono SoundPlus VOICE/MODEM CODECTexas Instruments
Texas Instruments
PCM3501ELow Voltage/ Low Power/ 16-Bit/ Mono VOICE/MODEM CODECBurr-Brown Corporation
Burr-Brown Corporation

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche