Cirrus-logic CRD5376 User Manual Page 29
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CRD5376
DS612RD2 29
2.4.1 Analog Voltage Regulators
Linear voltage regulators create the positive and negative analog power supply voltages to the analog
components on CRD5376. These regulate the +3.3 V and -3.3 V power supply inputs to create the +2.5 V
and -2.5 V analog power supplies.
The +2.5 V and -2.5 V power supplies to the analog components on CRD5376 include reverse biased
Schottkey diodes to ground to protect against reverse voltages that could latch-up the CMOS analog com-
ponents. Also included on +2.5 V and -2.5 V are several 100 uF bulk capacitors for bypassing and to help
settle transients plus individual 0.1 uF bypass capacitors local to the power supply pins of each device.
2.5 PCB Layout
2.5.1 Layer Stack
CRD5376 layer 1 is dedicated for analog and digital routing. Critical analog signal routes for channels 1
and 2 are on this layer. Some digital routes for the digital filter are also included on this layer away from
the analog signal routes.
CRD5376 layer 2 is a solid ground plane without splits or routing. A solid ground plane provides the best
return path for bypassed noise to leave the system. No separate analog ground is required since analog
signals on CRD5376 are differentially routed.
CRD5376 layer 3 is dedicated for power supply routing. Each power supply net includes at least 100 µF
bulk capacitance as a charge well for settling transient currents.
CRD5376 layer 4 is dedicated as a digital routing layer with ground fill.
Specification Value
Positive Analog Power Supply +2.5 V
Low Noise Micropower Regulator - Linear Tech LT1962ES8-2.5
Surface Mount Package Type MSOP-8
Load Regulation, -40 C to +85 C +/- 25 mV
Quiescent Current, Current @ 100 mA Load
30 µA, 2 mA
Output Voltage Noise, 10 Hz - 100 kHz
20 µV
RMS
Ripple Rejection, DC - 200 Hz > 60 dB
Specification Value
Negative Analog Supply -2.5 V
Low Noise Micropower Regulator - Linear Tech LT1964ES5-BYP
Surface Mount Package Type SOT-23
Load Regulation, -40 C to +85 C +/- 30 mV
Quiescent Current, Current @ 100 mA Load
30 µA, 1.3 mA
Output Voltage Noise, 10 Hz - 100 kHz
20 µV
RMS
Ripple Rejection, DC - 200 Hz > 45 dB
- Features 1
- General Description 1
- REVISION HISTORY 2
- TABLE OF CONTENTS 3
- LIST OF FIGURES 4
- LIST OF TABLES 4
- 1. INITIAL SETUP 5
- 1.1 Kit Contents 5
- 1.2 Hardware Setup 5
- 1.2.1 Default Jumper Settings 6
- 1.3 Software Setup 7
- 1.3.1 PC Requirements 7
- 8 DS612RD2 8
- 1.4 Self-Testing CRD5376 9
- 1.4.1 Noise Test 9
- 1.4.2 Distortion Test 10
- 2. HARDWARE DESCRIPTION 11
- 2.1 Block Diagram 11
- 2.2.1.1 External Inputs - INA 12
- 2.2.1.4 Input Protection 12
- 2.2.1.5 Input RC Filters 13
- 2.2.1.7 Analog Test Switches 14
- 2.2.1.6 Common Mode Bias 14
- 2.2.2.3 Anti-alias RC Filters 17
- 2.2.3.2 Offset Enable - OFST 17
- 2.2.4 Delta-Sigma Test DAC 18
- 2.2.5 Voltage Reference 18
- 2.3 Digital Hardware 19
- 2.3.1 Digital Filter 19
- 20 DS612RD2 20
- 2.3.1.1 MCLK vs. MCLK/2 Usage 21
- 22 DS612RD2 22
- CS5376A uController MCLK/2 22
- SDTKI R74 R83 22
- DS612RD2 23 23
- 2.3.2.1 SPI Interface 24
- 2.3.2.2 USB Interface 24
- 2.3.2.3 Reset Source 24
- 2.3.2.4 Clock Source 24
- 2.3.2.5 Timebreak Signal 25
- 2.3.2.6 C2 Debug Interface 25
- 2.3.4 RS-485 Telemetry 26
- 2.3.4.1 CLK, SYNC 27
- 2.3.5 UART Connection 28
- 2.3.6 External Connector 28
- 2.4 Power Supplies 28
- DS612RD2 29 29
- 2.5.2 Differential Pairs 30
- 2.5.3 Bypass Capacitors 31
- 3. SOFTWARE DESCRIPTION 32
- 3.1 Menu Bar 32
- 3.2 About Panel 33
- 3.3 Setup Panel 34
- 3.3.1 USB Port 35
- 3.3.2 Digital Filter 36
- 3.3.3 Analog Front End 37
- 3.3.4 Test Bit Stream 37
- 3.3.5 Gain/Offset 38
- 3.3.6 Data Capture 39
- 3.3.7 External Macros 40
- 3.4 Analysis Panel 41
- 3.4.1 Test Select 42
- 3.4.2 Statistics 43
- 3.4.3 Plot Enable 43
- 44 DS612RD2 44
- 3.5 Control Panel 45
- 3.5.1 DF Registers 46
- 3.5.2 DF Commands 46
- 3.5.3 SPI 46
- 3.5.4 Macros 47
- 3.5.5 GPIO 47
- 3.5.6 Customize 48
- 3.5.7 External Macros 48
- 4. BILL OF MATERIALS 49
- 50 DS612RD2 50
- 5. LAYER PLOTS 51
- 52 DS612RD2 52
- DS612RD2 53 53
- 54 DS612RD2 54
- DS612RD2 55 55
- 56 DS612RD2 56
- 6. SCHEMATICS 57
- 58 DS612RD2 58
- DS612RD2 59 59
- 60 DS612RD2 60
- DS612RD2 61 61
- 62 DS612RD2 62
- DS612RD2 63 63
- 64 DS612RD2 64
- DS612RD2 65 65
- 66 DS612RD2 66
- DS612RD2 67 67
- 68 DS612RD2 68
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