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Multi-Bit A/D for Class-D Real-Time PSR Feedback

Features

z Advanced Multi-bit Delta-Sigma Architecture

z Real-time Feedback of Power Supply

Conditions (AC and DC)

z Filterless Digital Output Resulting in Very Low

Signal Delay

z 135 mW Power Consumption

z Supports Logic Levels Between 3.3 V and

5.0 V

z Differential Analog Architecture

z Modulator Overflow Detection

z Interfaces Directly to the CS44800/CS44600

Class-D PWM Modulator

z Multi-bit Conversion at up to 7.5 MHz

z Delivers Modulated Data Over 2-Wire Interface

General Description

The CS4461 is a complete analog-to-digital converter

for class-D real-time power supply rejection (PSR) feed-

back. It performs sampling and analog-to-digital

conversion, generating digital data for input to a

class-D modulator with real-time PSR feedback

capabilities.

The CS4461 uses a 5th-order, multi-bit delta-sigma

modulator followed by output data formatting. The ADC

uses a differential architecture which provides excellent

noise rejection.

The CS4461 feeds back the AC and DC voltage compo-

nents and is ideal for class-D audio systems requiring

high power supply rejection.

The CS4461 is available in a 24-pin TSSOP package in

both Commercial (-10° to +70° C) and Automotive

grade (-40° to +85° C). The CDB44800 Customer Dem-

onstration board is also available for device evaluation

and implementation suggestions. Please see “Ordering

Information” on page 11 for complete details.

Voltage Reference

REFGND

AIN-

AIN+

FILT+

PSR_DATA

PSR_SYNC

5.0 V

(VA)

GND

PSR_MCLK

S/H

LP Filter

∆Σ

DAC

Output Data

Formatting

3.3 V to 5.0 V

(VDP)

PSR_EN

OVERFLOW

PSR_RESET

SEPTEMBER '05

DS650F1

CS4461

1 2 3 4 5 6 ... 10 11

Inhaltsverzeichnis

Seite 1 - General Description

Seite 2 - LIST OF FIGURES

10 DS650F1CS44615. PACKAGE DIMENSIONS Notes:1. “D” and “E1” are reference datums and do not included mold flash or protrusions, but do include moldmi

Seite 3 - ABSOLUTE MAXIMUM RATINGS

DS650F1 11CS44616. ORDERING INFORMATION7. REVISION HISTORYProduct Description Package Pb-Free Grade Temp Range Container Order #CS4461Multi-bit A/D fo

Seite 4 - DC ELECTRICAL CHARACTERISTICS

2 DS650F1CS4461TABLE OF CONTENTS1. CHARACTERISTICS AND SPECIFICATIONS ...

Seite 5 - ANALOG CHARACTERISTICS

DS650F1 3CS44611. CHARACTERISTICS AND SPECIFICATIONS(All Min/Max characteristics and specifications are guaranteed over the Specified Operating Condit

Seite 6 - 2. PIN DESCRIPTIONS

4 DS650F1CS4461DC ELECTRICAL CHARACTERISTICS(GND = 0 V, all voltages with respect to ground. PSR_MCLK=12.288 MHz)Notes:4. Power Down Mod

Seite 7 - 3. TYPICAL CONNECTION DIAGRAM

DS650F1 5CS4461ANALOG CHARACTERISTICS(Test conditions (unless otherwise specified): Input test signal is a 1 kHz sine wave; measurement bandwidth is 1

Seite 8 - 4. APPLICATIONS

6 DS650F1CS44612. PIN DESCRIPTIONS Pin Name # Pin DescriprionVDP681314Digital Logic Power (Input) – Digital core and input/output power supply. Nom

Seite 9 - 4.4 Overflow Detection

DS650F1 7CS44613. TYPICAL CONNECTION DIAGRAMCS4461AIN+AIN-REFGND+5.0 V+3.3 V or +5.0 V0.1 µF0.1 µFPWMModulatorwith PSRProcessingPSR_MCLKPSR_SYNCPSR_DA

Seite 10 - 5. PACKAGE DIMENSIONS

8 DS650F1CS44614. APPLICATIONS4.1 Digital ConnectionsPSR_MCLK provides the system clock for the CS4461. PSR_SYNC and PSR_DATA provide the output ofthe

Seite 11 - 7. REVISION HISTORY

DS650F1 9CS44614.3 Power-Up SequenceReliable power-up can be accomplished by keeping the device in reset until the power supplies and clocksare stable

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Cirrus-logic CS4461 Bedienungsanleitung

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