Datasheet

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PGA2505

Burr-BrownAudio

™ Digitally-Controlled

FEATURES APPLICATIONS

DESCRIPTION

PGA2505

www.ti.com

......................................................................................................................................................... SBOS396B – MARCH 2009 – REVISED JUNE 2009

MICROPHONE PREAMPLIFIER

• MICROPHONE PREAMPLIFIERS AND MIXERS

234

• FULLY DIFFERENTIAL lNPUT-TO-OUTPUT

ARCHITECTURE

• DIGITAL MIXERS AND RECORDERS

• DIGITAL AUDIO EDITING SYSTEMS

• DIGITALLY-CONTROLLED GAIN USING SPI™:

• BROADCAST EQUIPMENT

– Gain Range: 9dB through 60dB,

• INTERCOMS

3dB per Step

– Unity (0dB) Gain Setting via Serial Port

• DYNAMIC PERFORMANCE:

The PGA2505 is a digitally-controlled, analog

– Equivalent Input Noise with Z

= 150 Ω

microphone preamplifier designed for use as a

and Gain = 30dB: – 123dBu

front-end for high-performance audio analog-to-digital

– Total Harmonic Distortion plus Noise

converters (ADCs). The PGA2505 features include

(THD+N) with Gain = 30dB: 0.0006%

low noise, wide dynamic range, and a differential

signal path. An on-chip dc servo loop is employed to

• ZERO CROSSING DETECTION MINIMIZES

minimize dc offset, while a common-mode servo

AUDIBLE ARTIFACTS WHEN GAIN

function may be used to enhance common-mode

SWITCHING

rejection.SoundPlus™

• INTEGRATED DC SERVO MINIMIZES

The PGA2505 features a gain range of 9dB through

OUTPUT OFFSET VOLTAGE

60dB (3dB/step), along with a unity gain setting. The

• COMMON-MODE SERVO IMPROVES CMRR

wide gain range allows the PGA2505 to be used with

• FOUR-WIRE SERIAL CONTROL PORT

a variety of microphones. Gain settings and internal

INTERFACE:

functions are programmed using a 16-bit control

word, which is loaded using a simple serial port

– Simple Interface to Microprocessor

interface. A serial data output pin provides support for

or DSP Serial Ports

daisy-chained connection of multiple PGA2505

– Supports Daisy-Chaining of Multiple

devices. Four programmable digital outputs are

PGA2505 Devices

provided for controlling the external switching of input

• OVER-RANGE OUTPUT PIN PROVIDES

pads, phantom power, and high-pass filters. The

CLIPPING INDICATION

PGA2505 requires both +5V and – 5V power supplies

and is available in a small SSOP-24 package.

• FOUR GENERAL-PURPOSE

DIGITAL OUTPUT PINS

• ± 5V POWER SUPPLIES

• AVAILABLE IN AN 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.

2 SoundPlus is a trademark of Texas Instruments Incorporated.

3 SPI is a trademark of Motorola, Inc..

4 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 the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (18 pages)

PAGE 1
PGA2505 PG A 250 5 Burr-Brown Audio www.ti.com .........................................................................................................................................................
PAGE 2
PGA2505 SBOS396B – MARCH 2009 – REVISED JUNE 2009 ......................................................................................................................................................... www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
PAGE 3
PGA2505 www.ti.com ......................................................................................................................................................... SBOS396B – MARCH 2009 – REVISED JUNE 2009 ELECTRICAL CHARACTERISTICS At TA = +25°C, VA+ = +5V, VA– = –5V, VD– = –5V, and VCOMIN = 0V, unless otherwise noted. PGA2505 PARAMETERS CONDITIONS MIN TYP MAX UNIT DC CHARACTERISTICS Step Size Gain = 9dB through 60dB 3 dB Gain Error All gain settings ±0.
PAGE 4
PGA2505 SBOS396B – MARCH 2009 – REVISED JUNE 2009 ......................................................................................................................................................... www.ti.com SWITCHING CHARACTERISTICS Over operating free-air temperature range (unless otherwise noted). PGA2505 PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 6.
PAGE 5
PGA2505 www.ti.com .........................................................................................................................................................
PAGE 6
PGA2505 SBOS396B – MARCH 2009 – REVISED JUNE 2009 ......................................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS At TA = +25°C, VA+ = +5V, VA– = –5V, VD– = –5V, and VCOMIN = 0V, unless otherwise noted.
PAGE 7
PGA2505 www.ti.com ......................................................................................................................................................... SBOS396B – MARCH 2009 – REVISED JUNE 2009 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VA+ = +5V, VA– = –5V, VD– = –5V, and VCOMIN = 0V, unless otherwise noted. THD + N vs FREQUENCY (ZS = 40Ω, RL = 600Ω, VCOMIN = +2.5V, BW = 22Hz to 22kHz) 0.1 THD + N vs OUTPUT SWING (ZS = 40Ω, RL = 600Ω, VCOMIN = 0V, BW = 22Hz to 22kHz) 0.
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PGA2505 SBOS396B – MARCH 2009 – REVISED JUNE 2009 ......................................................................................................................................................... www.ti.com APPLICATION INFORMATION space OVERVIEW The differential analog output of the PGA2505 is constantly monitored by a dc servo amplifier loop.
PAGE 9
PGA2505 www.ti.com ......................................................................................................................................................... SBOS396B – MARCH 2009 – REVISED JUNE 2009 The PGA2505 includes a common-mode servo function. This function is enabled and disabled using the CM bit in the serial control word; see Figure 10. When enabled, the servo provides common-mode negative feedback at the input differential pair, resulting in very low common-mode input impedance.
PAGE 10
PGA2505 SBOS396B – MARCH 2009 – REVISED JUNE 2009 ......................................................................................................................................................... www.ti.com SERIAL PORT OPERATION The SCLK input is used to clock serial data into the SDI pin and out of the SDO pin. The SDI pin functions as the serial data input, and is used to write the serial port register.
PAGE 11
PGA2505 www.ti.com ......................................................................................................................................................... SBOS396B – MARCH 2009 – REVISED JUNE 2009 DAISY-CHAINING MULTIPLE PGA2505 PREAMPLIFIERS Because the serial port interface may be viewed as a serial in, serial out shift register, multiple PGA2505 preamplifiers may be connected in a cascaded or daisy-chained fashion, as shown in Figure 11.
PAGE 12
PGA2505 SBOS396B – MARCH 2009 – REVISED JUNE 2009 ......................................................................................................................................................... www.ti.com APPLICATION INFORMATION This section provides practical information designing the PGA2505 into end applications. for BASIC CIRCUIT CONFIGURATION A typical application configuration, without the input and output circuitry, is shown in Figure 13.
PAGE 13
PGA2505 www.ti.com ......................................................................................................................................................... SBOS396B – MARCH 2009 – REVISED JUNE 2009 INPUT CIRCUIT CONSIDERATIONS The blocking capacitors, along with the PGA2505 input resistance, form a high-pass filter circuit.
PAGE 14
PGA2505 SBOS396B – MARCH 2009 – REVISED JUNE 2009 ......................................................................................................................................................... www.ti.com OPERATION WITH VCOMIN = +2.5V As a suggested alternative, the PGA2505 analog outputs may be ac-coupled to the ADC inputs, allowing the PGA2505 to operate with VCOMIN = 0V in order to achieve best performance.
PAGE 15
PGA2505 www.ti.com ......................................................................................................................................................... SBOS396B – MARCH 2009 – REVISED JUNE 2009 A/D Converter PGA2505 VOUT+ R C PGA VOUT- VCOMIN (1) Serial Data Output PCM or DSD ADC R VCOM Output Antialiasing Filter 0.1mF (1) Recommended devices are the PCM1804, PCM4202, PCM4204, PCM4220, or PCM4222. Figure 16.
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PACKAGE OPTION ADDENDUM www.ti.
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MECHANICAL DATA MSSO002E – JANUARY 1995 – REVISED DECEMBER 2001 DB (R-PDSO-G**) PLASTIC SMALL-OUTLINE 28 PINS SHOWN 0,38 0,22 0,65 28 0,15 M 15 0,25 0,09 8,20 7,40 5,60 5,00 Gage Plane 1 14 0,25 A 0°–ā8° 0,95 0,55 Seating Plane 2,00 MAX 0,10 0,05 MIN PINS ** 14 16 20 24 28 30 38 A MAX 6,50 6,50 7,50 8,50 10,50 10,50 12,90 A MIN 5,90 5,90 6,90 7,90 9,90 9,90 12,30 DIM 4040065 /E 12/01 NOTES: A. B. C. D. All linear dimensions are in millimeters.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.