Cirrus Logic WM8940 Manuals

Manuals and User Guides for Cirrus Logic WM8940. We have 1 Cirrus Logic WM8940 manual available for free PDF download: Manual

Cirrus Logic WM8940 Manual (88 pages)

Mono CODEC with Speaker Driver

Brand: Cirrus Logic | Category: Conference System | Size: 1 MB

Description
1
Features
1
Applications
1
Block Diagram
2
Table of Contents
3
Pin Configuration
6
Ordering Information
6
Pin Description
7
Absolute Maximum Ratings
8
Recommended Operating Conditions
8
Electrical Characteristics
9
Terminology
11
Audio Paths Overview
12
Power Consumption
13
Signal Timing Requirements
14
System Clock Timing
14
Audio Interface Timing - Master Mode
15
Audio Interface Timing - Slave Mode
16
Control Interface Timing - 3-Wire Mode
17
Control Interface Timing - 2-Wire Mode
18
Device Description
19
Introduction
19
Features
19
Microphone Inputs
19
Pga and Alc Operation
19
Aux Input
19
Adc
19
Hi-Fi Dac
19
Digital Filtering
19
Output Mixing and Volume Adjust
19
Control Interfaces
20
Clocking Schemes
20
Power Control
20
Input Signal Path
20
Microphone Inputs
20
Input Pga Volume Control
22
Auxiliary Input
22
Input Boost
23
Microphone Biasing Circuit
24
Analogue to Digital Converter (Adc)
25
Adc Digital Filters
25
Selectable High Pass Filter
26
Programmable Notch Filters
27
Digital Adc Volume Control
29
Input Limiter / Automatic Level Control (Alc)
29
Normal Mode
32
Limiter Mode
32
Attack and Decay Times
33
Normal Mode
33
Limiter Mode
34
Minimum and Maximum Gain
35
Alc Hold Time (Normal Mode Only)
36
Peak Limiter
38
Noise Gate (Normal Mode Only)
39
Output Signal Path
41
Digital Hi-Fi Dac Volume Control
41
Hi-Fi Digital to Analogue Converter (Dac)
42
Automute
42
Dac Output Limiter
42
Volume Boost
43
Analogue Outputs
45
Spkoutp/Spkoutn Outputs
45
Zero Cross Timeout
46
Mono Mixer and Output
47
Enabling the Outputs
47
Unused Analogue Inputs/Outputs
48
Output Switch
49
Thermal Shutdown
49
Speaker Output
49
Headphone Output
50
Mono Output
50
Digital Audio Interfaces
51
Master and Slave Mode Operation
51
Audio Data Formats
51
Audio Interface Control
53
Loopback
55
Audio Sample Rates
55
Master Clock and Phase Locked Loop (Pll)
55
Integer N Division
57
Fractional K Mode
57
Example Pll Configuration
57
Companding
58
General Purpose Input/Output
60
Control Interface
61
Selection of Control Mode and 2-Wire Mode Address
61
Use of Mode as a Gpio Pin in 3-Wire Mode
61
3-Wire Serial Control Mode
62
Readback in 3-Wire Mode
62
2-Wire Serial Control Mode
63
Resetting the Chip
63
Power Supplies
64
Recommended Power Up/Down Sequence
64
Power Management
66
VMID
66
Biasen
66
Estimated Supply Currents
66
Pop Minimisation
67
Register Map
68
Register Bits by Address
69
Digital Filter Characteristics
80
Terminology
80
Dac Filter Responses
81
Adc Filter Responses
81
Highpass Filter
82
Notch Filters and Low-Pass Filter
82
Notch Filter Worked Example
84
Applications Information
85
Recommended External Components
85
Package Diagram
86
Important Notice
87
Revision History
88

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