CDB5376 Cirrus Logic Inc, CDB5376 Datasheet - Page 20

• Manufacturer Part Number: CDB5376
• Description: EVALUATION BOARD FOR CS5376
• Manufacturer: Cirrus Logic Inc

Specifications of CDB5376

• Main Purpose: Seismic Evaluation System
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: CS3301A, CS3302A, CS4373A, CS5372A, CS5376A
• Primary Attributes: Quad Digital Filter
• Secondary Attributes: Graphical User Interface, SPI™ & USB Interfaces
• Processor To Be Evaluated: CS330x, CS4373A, CS537x
• Interface Type: USB
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 598-1778

2.2.2.3
The CS5372A ∆Σ modulator is 4th order and high-frequency input signals can cause instability. Simple
single-pole anti-alias RC filters are required between the CS3301A/02A amplifier outputs and the
CS5372A modulator inputs to bandwidth limit analog signals into the modulator.
The CS3301A/02A amplifier outputs are connected to external 680
anti-alias RC filter is created by connecting 20 nF of high-linearity differential capacitance (2x 10 nF C0G)
between each half of the rough and fine signals.
2.2.3
A single CS5372A dual modulator performs the A/D function for differential analog signals from two
CS3301A/02A amplifiers. The digital outputs are oversampled ∆Σ bit streams.
2.2.3.1
The modulator analog inputs are separated into rough and fine signals, each of which has an anti-alias
RC filter to limit the signal bandwidth into the modulator inputs.
20
Analog Signals
INR1, INF1
INR2, INF2
VREF
Digital Signals
MDATA[1..2]
MFLAG[1..2]
MCLK
MSYNC
PWDN[1..2]
OFST
Delta-Sigma Modulators
Anti-alias RC Filters
Rough-Fine Inputs - INR, INF
INR+
INF+
INF-
INR-
Figure 2. RC Filter External Components
Description
Channel 1 analog rough / fine inputs
Channel 2 analog rough / fine inputs
Voltage reference analog inputs
Description
Modulator delta-sigma data outputs
Modulator over-range flag outputs
Modulator clock input
Modulator synchronization input
Power down mode enable
Internal offset enable (+VD when using CS3301A/02A)
Ω
series resistors and a differential
INR+
INF+
INF-
INR-
CDB5376
DS612DB3