IC DAC 24BIT VCXO/PLL 24-SSOP

PCM1740E/2K

Manufacturer Part NumberPCM1740E/2K
DescriptionIC DAC 24BIT VCXO/PLL 24-SSOP
ManufacturerTexas Instruments
SeriesSoundPlus™
PCM1740E/2K datasheet
 


Specifications of PCM1740E/2K

Number Of Bits24Data InterfaceSerial
Number Of Converters2Voltage Supply SourceAnalog and Digital
Power Dissipation (max)150mWOperating Temperature-25°C ~ 85°C
Mounting TypeSurface MountPackage / Case24-SSOP
For Use With296-9476 - DEMO BOARD FOR PCM1740Lead Free Status / RoHS StatusLead free / RoHS Compliant
Settling Time-  
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DIGITAL-TO-ANALOG CONVERTER
FEATURES
COMPLETE DELTA-SIGMA STEREO DAC
VOLTAGE-CONTROLLED CRYSTAL OSCILLATOR:
27MHz 150ppm Output with 0V to 3V Input
PROGRAMMABLE PLL
256f
or 384f
Audio System Clock Output
S
S
DYNAMIC PERFORMANCE:
Dynamic Range: 94dB
SNR: 94dB
THD+N: –89dB
SAMPLING FREQUENCIES:
16kHz, 22.05kHz, 24kHz
32kHz, 44.1kHz, 48kHz
64kHz, 88.2kHz, 96kHz
SERIAL AUDIO INTERFACE:
2
Standard or I
S™ Data Formats
16-, 20-, or 24-Bit Data
2
I
C-BUS™ INTERFACE FOR CONTROL
REGISTERS:
Slave Receiver Operation
7-Bit Addressing
Standard Transfer Rate (up to 100kbps)
PROGRAMMABLE CONTROLS:
Digital Attenuation (256 steps)
Soft Mute
Infinite Zero Detect Mute
De-Emphasis (32kHz, 44.1kHz, 48kHz)
DAC Output Mode
SINGLE +5V SUPPLY
SMALL SSOP-24 PACKAGE
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.
SoundPLUS is a trademark of Texas Instruments.
2
2
2
I
C-Bus, I
C, and I
S are trademarks of NXP B.V.
All other trademarks are the property of their respective owners.
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.
Stereo Audio
TM
with VCXO and PLL
APPLICATIONS
SET-TOP BOXES
DIGITAL BROADCAST RECEIVERS
DESCRIPTION
The PCM1740 is a complete stereo audio digital-to-
analog converter with on-chip PLL and VCXO. The
PCM1740 is designed specifically for set-top box applica-
tions requiring high-quality audio playback, a precision
tuned 27MHz master clock source, and support for mul-
tiple audio-sampling frequencies.
The stereo digital-to-analog converter (DAC) uses multi-
bit, delta-sigma architecture, which includes an 8x inter-
polation filter, 3rd-order noise shaping, 5-level amplitude
quantization, and an analog low-pass filter. The PCM1740
includes a number of user-programmable functions, which
are accessed via a standard I
BCK
PCM
Audio
LRCK
I/F
DATA
SCL
2
I
C
SDA
I/F
and
AD1
REGs
AD0
XTUN
XT1
27MHz
VCXO
Crystal
XT2
RST
www.ti.com
PCM1740
SBAS128B – JANUARY 2000 – REVISED MAY 2007
2
C-Bus interface.
DAC
8x
(L)
Oversampling
Low-Pass
Digital Filter
Filter
and
and Amp
Sub-Functions
DAC
Process
(R)
Counter N
Phase
LPF
VCO
Detector
Counter M
Reset
Power Supply
V
PGND
V
AGND
V
DGND
PP
CC
DD
Copyright © 2000-2007, Texas Instruments Incorporated
V
L
OUT
V
COM
V
R
OUT
ZERO
SCKO
(256f
/384f
)
S
S
MCKO
(27MHz)

PCM1740E/2K Summary of contents

  • Page 1

    ... De-Emphasis (32kHz, 44.1kHz, 48kHz) DAC Output Mode SINGLE +5V SUPPLY SMALL SSOP-24 PACKAGE 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. SoundPLUS is a trademark of Texas Instruments ...

  • Page 2

    ... Schmitt trigger input with internal pull-up resistor. (3) Open drain output. www.ti.com ORDERING TRANSPORT NUMBER MEDIA PCM1740E Rails, 58 PCM1740E/2K Tape and Reel, 2000 I/O FUNCTION — 27MHz Crystal connection. — PLL and VCXO ground. IN VCXO tune, tuning voltage range from 0V to 3V. ...

  • Page 3

    ELECTRICAL CHARACTERISTICS All specifications + PARAMETER RESOLUTION DATA FORMAT Audio Interface Format Audio Data Bit Length Audio Data Format Sampling Frequency ( Internal System Clock ...

  • Page 4

    ELECTRICAL CHARACTERISTICS All specifications + PARAMETER DC ACCURACY Gain Error Gain Mismatch, Channel-to-Channel Bipolar Zero Error ANALOG OUTPUT Voltage Range Center Voltage Load Impedance DIGITAL FILTER PERFORMANCE ...

  • Page 5

    TYPICAL CHARACTERISTICS + +5V 44.1kHz FREQUENCY RESPONSE (De-emphasis OFF 44.1kHz –20 –40 –60 –80 –100 DE-EMPHASIS ...

  • Page 6

    TYPICAL CHARACTERISTICS + +5V 44.1kHz ANALOG FILTER (1Hz to 10MHz –20 –40 –60 –80 –100 0 0.1 0.1 0.2 0.3 Log Frequency (Hz) ...

  • Page 7

    STEREO DIGITAL-TO-ANALOG CONVERTER The stereo DACs of the PCM1740 use a multi-level delta- sigma architecture. Based upon a 3rd-order noise shaper and a 5-level amplitude quantizer, this section converts the 8x oversampled, 18-bit input data from the interpolation filter to ...

  • Page 8

    The 27MHz clock is available at the MCKO output (pin 5). The VCXO output frequency can be precisely tuned using a control voltage at the XTUN input (pin 3). The tuning range is 27MHz 150ppm typical for ...

  • Page 9

    The PLL can generate one of nine pre-programmed system clock rates for either 256f or 384f output. The PLL output S S and sampling frequencies are programmed using Control Register 3. Table I shows the available sampling frequencies and the ...

  • Page 10

    ZERO FLAG OUTPUT The PCM1740 includes a zero flag output, ZERO (pin 16). This is an open-drain output, and a 10k connected recommended when using the ZERO DD flag as a logic output. The PCM1740 includes an ...

  • Page 11

    LRCKIN t t BCH BCL BCKIN t BCY DIN t DS FIGURE 10. Audio Interface Timing. Loss of Synchronization Ideally, LRCK and BCK will be derived from the SCKO output, ensuring synchronous operation. For other cases, the PCM1740 includes circuitry ...

  • Page 12

    REGISTER DEFINITIONS B15 B14 B13 B12 Register 0 res res res Left Channel Attenuation Data Default: AL[7: HEX Register 0 is used to set the digital attenuation level for the Left Channel. If the ATC bit in Register ...

  • Page 13

    IW0 Audio Data Word Length IW1 The IW0 and IW1 bits are used to select the data word length for the audio serial interface. The audio data format is selected using the IIS bit in Register 3. IW1 IW0 0 ...

  • Page 14

    SYS Audio System Clock (or SCKO) The SYS bit is used to select the system clock (or SCKO) frequency, either 256f SYS = 0 384f SYS = 1 256f DSR0 Sampling Frequency Multiplier DSR1 The DSR0 and DSR1 bits are ...

  • Page 15

    I C-BUS INTERFACE DESCRIPTION 2 The PCM1740 includes an I C-Bus interface for writing the internal control registers. This provides an industry standard method for interfacing a host CPU control port to the PCM1740. The PCM1740 operates as a ...

  • Page 16

    Data transfer begins with a Start condition, and is immedi- ately followed by the Slave address and Read /Write bit. The Read/ Write bit is set to ‘0’ for the PCM1740, in order to write data to the control register ...

  • Page 17

    APPLICATIONS INFORMATION BASIC CONNECTION DIAGRAM A basic connection diagram is shown in Figure 16. Power supply and reference decoupling capacitors should be located as close as possible to the PCM1740 package. The 27MHz crystal should also be located as close ...

  • Page 18

    The VTUN control voltage is generated by the MPEG-2 controller, which compares the MCKO output clock from the PCM1740 with the clock count received from the trans- mitter. VTUN is adjusted to retain clock synchronization between the transmitted and received ...

  • Page 19

    PCM1740 V R/L OUT (a) Dual-Supply Filter Circuit PCM1740 V R/L OUT V COM (b) Single-Supply Filter Circuit FIGURE 19. Recommended Output Filter Circuits. PCM1740 SBAS128B 5.76k 220pF ...

  • Page 20

    DATE REVISION PAGE SECTION — Entire Document 2 Electrical Characteristics 5/ SF0, SF1 Figure 12 15 Figure 14 NOTE: Page numbers for previous revisions may differ from page numbers in the current version. 20 Revision History DESCRIPTION Updated ...

  • Page 21

    ... PCM1740E ACTIVE PCM1740E-2/2K OBSOLETE PCM1740E-2/2KG4 OBSOLETE PCM1740E/2K ACTIVE PCM1740E/2KG4 ACTIVE PCM1740EG4 ACTIVE (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design ...

  • Page 22

    ... TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing PCM1740E/2K SSOP DB PACKAGE MATERIALS INFORMATION Pins SPQ Reel Reel A0 (mm) Diameter Width (mm) W1 (mm) 24 2000 330.0 17.4 8.5 Pack Materials-Page 1 13-Jun-2008 B0 (mm) K0 (mm Pin1 (mm) (mm) Quadrant 8.6 2 ...

  • Page 23

    ... Device Package Type PCM1740E/2K SSOP PACKAGE MATERIALS INFORMATION Package Drawing Pins SPQ Length (mm 2000 Pack Materials-Page 2 13-Jun-2008 Width (mm) Height (mm) 336.6 336.6 28.6 ...

  • Page 24

    DB (R-PDSO-G**) 28 PINS SHOWN 0, 2,00 MAX PINS ** DIM A MAX A MIN NOTES: A. All linear dimensions are in millimeters. B. This drawing is subject to change without notice. C. Body dimensions do not ...

  • Page 25

    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...