Cirrus-logic CDB5374 Manual de usuario Pagina 30
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CDB5374
30 DS862DB1
2.3.8 External Connector
Power supplies and telemetry signals route to a 20-pin double row connector with 0.1" spacing (J26). This
header provides a compact standardized connection to the CDB5374 external signals.
2.4 Power Supplies
Power is supplied to CDB5374 through banana jacks (J6, J7, J8, J9) or through the external connector
(J26). The banana jacks make separate connections to the EXT_VA-, EXT_VA+, GND, and EXT_VD
power supply nets, which connect to the analog and digital linear voltage regulator inputs. The external
connector makes separate connections only to the EXT_VA-, GND, and EXT_VA+ power supply inputs
and it is required to jumper EXT_VA+ to EXT_VD when powering CDB5374 from the external connector.
The EXT_VA-, EXT_VA+ and EXT_VD power supply inputs have zener protection diodes that limit the
maximum input voltages to +13 V or -13 V with respect to ground. Each input also has 100 uF bulk ca-
pacitance for bypassing and to help settle transients and another 0.01 uF capacitor to bypass high-fre-
quency noise.
2.4.1 Analog Voltage Regulators
Linear voltage regulators create the positive and negative analog power supply voltages to the analog
components on CDB5374. These regulate the EXT_VA+ and EXT_VA- power supply inputs to create the
VA+ and VA- analog power supplies.
Pins Name Signal
1, 2 CLK+, CLK- Clock Input
3, 4 SYNC+, SYNC- Synchronization Input
5, 6 SCL+, SCL- I2C Clock
7, 8 SDA+, SDA- I2C Data
9, 10 BYP_SDA+, BYP_SDA- I2C Data Bypass
11, 12 BYP_SCL+, BYP_SCL- I2C Clock Bypass
13, 14 TX, GND UART transmit
15, 16 RX, GND UART receive
17, 18 EXT_VA-, GND Negative Power Supply
19, 20 EXT_VA+, GND Positive Power Supply
Specification Value
Positive Analog Power Supply +2.5 V, +5 V
Low Noise Micropower Regulator - Linear Tech LT1763CS8
Surface Mount Package Type SO-8
Load Regulation, -40 C to +85 C +/- 25 mV
Quiescent Current, Current @ 100 mA Load
40 µA, 2 mA
Output Voltage Noise, 10 Hz - 100 kHz
20 µV
RMS
Ripple Rejection, DC - 200 Hz > 50 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
- DS862DB1 9 9
- 10 DS862DB1 10
- 1.4 Self-testing CDB5374 11
- 1.4.1 Noise test 11
- 1.4.2 Distortion Test 12
- DS862DB1 13 13
- 2.2 Analog Hardware 14
- 2.2.1 Analog Inputs 14
- 2.2.1.4 Input Protection 15
- 2.2.1.5 Input RC Filters 15
- 2.2.1.6 Common Mode Bias 15
- 2.2.2.1 GUARD Output 16
- 2.2.2.2 Analog Outputs - OUT 16
- 2.2.2.3 Anti-alias RC Filters 16
- 2.2.3.2 Offset Enable - OFST 17
- 2.2.4 Delta-Sigma Test DAC 18
- 2.2.5.2 Common Mode Bias 19
- 2.3 Digital Hardware 20
- 2.3.1 Digital Filter 20
- DS862DB1 21 21
- 2.3.2 Interface CPLD 22
- DS862DB1 23 23
- 24 DS862DB1 24
- DS862DB1 25 25
- 2.3.5 Phase Locked Loop 26
- Specification Value 27
- 8.192, 16.384, 32.768 MHz 27
- 2.3.6.1 CLK, SYNC 28
- 2.3.6.2 I 29
- C - SCL, SDA, Bypass 29
- 2.3.8 External Connector 30
- 2.4 Power Supplies 30
- DS862DB1 31 31
- 2.5 PCB Layout 32
- 2.5.1 Layer Stack 32
- 2.5.2 Differential Pairs 32
- 2.5.3 Bypass Capacitors 33
- 2.5.4 Dual Row Headers 34
- 3. SOFTWARE DESCRIPTION 35
- 3.1 Menu Bar 35
- 3.2 About Panel 36
- 3.3 Setup Panel 37
- 3.3.1 USB Port 38
- 3.3.2 Digital Filter 39
- 3.3.3 Analog Front End 40
- 3.3.4 Test Bit Stream 40
- 3.3.5 Gain/Offset 41
- 3.3.6 Data Capture 42
- 3.3.7 External Macros 43
- • M1 = . /macros/m1.mac 43
- • M2 = . /macros/m2.mac 43
- 3.4 Analysis Panel 44
- 3.4.1 Test Select 45
- 3.4.2 Statistics 46
- 3.4.3 Plot Enable 46
- DS862DB1 47 47
- 3.5 Control Panel 48
- 3.5.1 DF Registers 49
- 3.5.2 DF Commands 49
- 3.5.3 SPI 49
- 3.5.4 Macros 50
- 3.5.5 GPIO 50
- 3.5.6 Customize 51
- 3.5.7 External Macros 51
- 4. BILL OF MATERIALS 52
- CIRRUS LOGIC 53
- CDB5374-Z_Rev_A.bom 53
- 5. LAYER PLOTS 54
- DS862DB1 55 55
- 56 DS862DB1 56
- DS862DB1 57 57
- 58 DS862DB1 58
- DS862DB1 59 59
- 60 DS862DB1 60
- DS862DB1 61 61
- 6. SCHEMATICS 62
- DS862DB1 63 63
- 64 DS862DB1 64
- DS862DB1 65 65
- 66 DS862DB1 66
- DS862DB1 67 67
- 68 DS862DB1 68
- DS862DB1 69 69
- 70 DS862DB1 70
- DS862DB1 71 71
- 72 DS862DB1 72
- DS862DB1 73 73
- 74 DS862DB1 74
- DS862DB1 75 75
- 76 DS862DB1 76
- DS862DB1 77 77
- 78 DS862DB1 78
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