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CS4461 데이터시트 PDF




Cirrus Logic에서 제조한 전자 부품 CS4461은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 CS4461 기능
기능 Multi-Bit A/D
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CS4461 데이터시트, 핀배열, 회로
www.DataSheet4U.com
CS4461
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.
FILT+
VQ REFGND
Voltage Reference
PSR_RESET PSR_EN
AIN+
AIN-
+
-
S/H
LP Filter
DAC
∆Σ
Output Data
Formatting
OVERFLOW
PSR_MCLK
PSR_SYNC
PSR_DATA
http://www.cirrus.com
5.0 V
(VA)
GND
3.3 V to 5.0 V
(VDP)
Copyright © Cirrus Logic, Inc. 2005
(All Rights Reserved)
SEPTEMBER '05
DS650F1




CS4461 pdf, 반도체, 판매, 대치품
DC ELECTRICAL CHARACTERISTICS
(GND = 0 V, all voltages with respect to ground.
PSR_MCLK=12.288 MHz)
Parameter
Power Supply Current
(Normal Operation)
VA
VDP = 5.0 V
VDP = 3.3 V
Power Supply Current
(Power-Down Mode) (Note 4)
VA
VDP = 5.0 V
Power Consumption
(Normal Operation)
(Power-Down Mode)
VDP = 5.0 V
VDP = 3.3 V
VDP = 5.0 V
ADC Power Supply Rejection Ratio (1 kHz)
(Note 5)
VQ Nominal Voltage
Output Impedance
Maximum allowable DC current source/sink
FILT+ Nominal Voltage
Output Impedance
Maximum allowable DC current source/sink
Symbol
IA
ID
ID
IA
ID
PSRR
Min
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Typ
17.5
22
14.5
2
2
198
135
20
65
2.5
25
0.01
5
18
0.01
CS4461
Max
21
26
17
-
-
235
161
-
-
-
-
-
-
-
-
Unit
mA
mA
mA
mA
mA
mW
mW
mW
mW
dB
V
k
mA
V
k
mA
Notes:
4. Power Down Mode is defined as PSR_RESET = Low with all clocks and data lines held static.
5. Valid with the recommended capacitor values on FILT+ and VQ as shown in the Typical Connection
Diagram.
DIGITAL CHARACTERISTICS
Parameter
High-Level Input Voltage
Low-Level Input Voltage
High-Level Output Voltage at Io = 100 µA
Low-Level Output Voltage at Io = 100 µA
OVERFLOW Current Sink
Input Leakage Current
THERMAL CHARACTERISTICS
Parameter
Allowable Junction Temperature
Junction to Ambient Thermal Impedance
(% of VDP)
(% of VDP)
(% of VDP)
(% of VDP)
Symbol
VIH
VIL
VOH
VOL
IOVERFLOW
Iin
Min
70%
-
70%
-
-
-
Typ Max Units
--
V
- 30%
V
--
V
- 15%
V
- 4.0 mA
- ±10 µA
Symbol
θJA
Min
-
-
Typ
-
70
Max
135
-
Unit
°C
°C/W
4 DS650F1

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CS4461 전자부품, 판매, 대치품
3. TYPICAL CONNECTION DIAGRAM
CS4461
+3.3 V or +5.0 V
+5.0 V
47 µF
0.1 µF
See “CS4461 Recom-
mended Analog Input
Buffer” on page 8.
1 µF
0.1 µF
47 µF
0.1 µF
VDP VDP VDP VDP
0.1 µF
VA
PSR_MCLK
22.1
PSR_SYNC 22.1
PSR_DATA 22.1
PWM
Modulator
with PSR
PSR_EN
Processing
AIN+
PSR_RESET
CS4461
AIN-
VDP
47 k
OVERFLOW
TEST
VQ
47 k
GND
GND
GND
FILT+
GND
GND
REFGND
GND
GND
Figure 1. Typical Connection Diagram
DS650F1
7

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