Cirrus Logic AN249 User Manual
AN249
CS5333 to CS5340 Conversion
by Kevin L Tretter
1. Introduction
The CS5333 and CS5340 are complete stereo analog-to-digital converters for digital audio systems.
These converters perform sampling, analog-to-digital conversion and anti-alias filte ring, generating 24-bit
values for both left and right channels. These small, low power conve rters are ideal for systems req uiring
wide dynamic range and low noise such as set-top boxes, A/V receivers, DVD-karaoke players, DVD recorders, and automotive applications. The CS5333 is no longer recommended for new designs, and the
CS5340 is the suggested replacement.
This application note identifies the implementation differences between these two devices, including:
- Key specifications
- Pinout differences
- Startup mode selections
- System clocking
- Input filter topology
- Reference pin decoupling
2. Key Specifications
Table 1 shows a comparison of the key specifications of these two devices, and Table 2 shows the pin
comparison between the CS5333 and the CS5340. Although these two devices are not pin compatible,
they are very similar in terms of overall functionality and feature set. The CS5340 achieves higher analog
performance and supports a wider range of output sample rates, including 192 kHz. This additional performance is the main reason for the increased power consumption of the CS5340 rel ative to the CS5333.
Parameter CS5333 CS5340 Units
Conversion 24 24 Bits
Dynam ic Range (A -wei ghted)* 95 98 dB
THD +N* -88 -95 dB
Analog Core Power Supply (VA) +1.8 to +3.3 +3.3 to +5.0 V
Digital Core Power Supply (VD) Powered from VA +3.3 to +5.0 V
Digital Interface Power Supply (VL) +1.8 to +3.3 +1.8 to +5.0 V
Maximum Power* 31 100 mW
Maximum Sample Rate 100 200 k Hz
Pack ag e 16-pin TSS OP 16-pin TSS OP
* Al l pe rformance/ p ower m easurem ents taken wi t h al l suppl i es s e t to 3.3 V
Table 1. Comparison of Key Specifications
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2004
(All Rights Reserved)
MAR ‘04
AN249REV1
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r
A
r
r
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The CS5333 and CS5340 are both available in a 16-pin TSSOP package. As can be seen from Table 2,
all but three pins correlate directly in terms of functionality. These three pins account for a difference in
operational mode selection and a separate voltage supply pin for the CS5340 digital core.
CS5333 CS5340 Description
Pin Number Pin Name Pin Number Pin Name
1 VL 3 VL Logic Powe
2 MCLK 2 MCLK Master Clock
3 SCLK 7 SCLK Serial Clock
4 SDATA 4 SDOUT Serial Data
5VA13V
6 GND 5 GND Ground Reference
7 LRCK 8 LRCK Left/Right Clock
8 DIV - - Speed Mode Select/MCLK Divide
9 DIF - - Digital Interface Format Select
10 TST - - Test Pin
11 FILT+ 15 FILT+ Voltage Reference
12 REF_GND 14 REF_GND Ground Reference
13 AINR 12 AINR Right Channel Analog Input
14 AINL 10 AINL Left Channel Analog Input
15 VQ 11 VQ Quiescent Voltage Reference
16 RST 9 RST Reset
1 M0 Mode Selection
6 VD Digital Powe
16 M1 Mode Selection
Analog Powe
Table 2. Pin Compatibility Between the CS5333 and CS5340
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3. Typical Connection Diagrams
Figures 1 and 2 illustrate the typical connection diagram for the CS5333 and CS5340 respectively. The
analog and digital core of the CS5333 are powered from VA, which can be set from 1.8 V to 3.3 V. The
VL supply pin powers the digital interface logic from 1. 8 V to 3.3 V and can be set independently from VA.
1.8 V to 3.3 V
1.8 V to 3.3 V
+
.1µF
µF
1
1µF
1 µ
0
5
VA
11
FILT+
12
REF_GND
F
15
VQ
CS 5333
1
VL
RST
DIF
DIV
0
16
9
8
.1µF
+
Configuration
1
Mode
µF
Analog Input Filter
Figure 3
14
AINL
13
AINR
GND TST
6
10
Figure 1. CS5333 Typical Connection Diagram
MCLK
LRCK
SCLK
SDATA
2
7
3
4
47k
Digital
Audio
Source
Ω
Connect to:
• V L fo r Mas te r Mod e
• GND for Slave Mode
3
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