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CS4461-CZZR

P1-P3P4-P6P7-P9P10-P11
Copyright © Cirrus Logic, Inc. 2005
(All Rights Reserved)
http://www.cirrus.com
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
VQ
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
2 DS650F1
CS4461
TABLE OF CONTENTS
1. CHARACTERISTICS AND SPECIFICATIONS ..................................................................................... 3
2. PIN DESCRIPTIONS ............................................................................................................................. 6
3. TYPICAL CONNECTION DIAGRAM .................................................................................................... 7
4. APPLICATIONS .................................................................................................................................... 8
4.1 Digital Connections ......................................................................................................................... 8
4.2 Analog Connections ....................................................................................................................... 8
4.3 Power-Up Sequence ...................................................................................................................... 9
4.4 Overflow Detection ......................................................................................................................... 9
4.5 Grounding and Power Supply Decoupling ......................................................................................9
5. PACKAGE DIMENSIONS ................................................................................................................. 10
6. ORDERING INFORMATION ............................................................................................................... 11
7. REVISION HISTORY ........................................................................................................................... 11
LIST OF FIGURES
Figure 1. Typical Connection Diagram......................................................................................................... 7
Figure 2. CS4461 Recommended Analog Input Buffer................................................................................8
DS650F1 3
CS4461
1. CHARACTERISTICS AND SPECIFICATIONS
(All Min/Max characteristics and specifications are guaranteed over the Specified Operating Conditions. Typical
performance characteristics and specifications are derived from measurements taken at typical supply voltages
and T
A
= 25°C.)
SPECIFIED OPERATING CONDITIONS
(GND = 0 V, all voltages with respect to 0 V.)
ABSOLUTE MAXIMUM RATINGS
(GND = 0 V, All voltages with respect to ground.) (Note 1)
Notes:
1. Operation beyond these limits may result in permanent damage to the device.
Normal operation is not guaranteed at these extremes.
2. Any pin except supplies. Transient currents of up to ±100 mA on the analog input pins will not cause
SCR latch-up.
3. The maximum over/under voltage is limited by the input current.
Parameter Symbol Min Typ Max Unit
DC Power Supplies: Positive Analog
Positive Digital
VA
VDP
4.75
3.1
5.0
3.3
5.25
5.25
V
V
Ambient Operating Temperature Commercial (-CZZ)
Automotive (-DZZ)
T
AC
T
AA
-10
-40
-
-
+70
+85
°C
°C
Parameter Symbol Min Max Units
DC Power Supplies: Analog
Digital
VA
VDP
-0.3
-0.3
+6.0
+6.0
V
V
Input Current (Note 2) I
in
- ±10 mA
Analog Input Voltage (Note 3) V
IN
GND - 0.7 VA + 0.7 V
Digital Input Voltage (Note 3) V
IND
-0.7 VDP + 0.7 V
Ambient Operating Temperature (Power Applied) T
A
-50 +95 °C
Storage Temperature T
stg
-65 +150 °C
P1-P3P4-P6P7-P9P10-P11

CS4461-CZZR

Mfr. #:
Buy CS4461-CZZR
Manufacturer:
Cirrus Logic
Description:
Audio A/D Converter ICs IC Mlt-Bit ADC ClssD w/Rltm PSR Fdbck
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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