CS8405资料

Copyright © Cirrus Logic, Inc. 2008(All Rights Reserved)CS5531/32/33/34-AS

16-bit and 24-bit ADCs with Ultra-low-noise PGIAFeatures󰂉Chopper-stabilized PGIA (Programmable Gain Instrumentation Amplifier, 1x to 64x)–12 nV/√Hz @ 0.1 Hz (No 1/f noise) at 64x–1200pA Input Current with Gains >1󰂉Delta-sigma Analog-to-digital Converter–Linearity Error: 0.0007% FS–Noise Free Resolution: Up to 23 bits󰂉Two- or Four-channel Differential MUX󰂉Scalable Input Span via Calibration –±5 mV to differential ±2.5V󰂉Scalable VREF Input: Up to Analog Supply󰂉Simple Three-wire Serial Interface–SPI™ and Microwire™ Compatible–Schmitt Trigger on Serial Clock (SCLK)󰂉R/W Calibration Registers Per Channel󰂉Selectable Word Rates: 6.25 to 3,840 Sps󰂉Selectable 50 or 60 Hz Rejection󰂉Power Supply Configurations–VA+ = +5 V; VA- = 0 V; VD+ = +3 V to +5 V–VA+ = +2.5 V; VA- = -2.5 V; VD+ = +3 V to +5 V–VA+ = +3 V; VA- = -3 V; VD+ = +3 VGeneral DescriptionThe CS5531/32/33/34 are highly integrated ∆Σ Analog-to-Digital Converters (ADCs) which use charge-balancetechniques to achieve 16-bit (CS5531/33) and 24-bit(CS5532/34) performance. The ADCs are optimized formeasuring low-level unipolar or bipolar signals in weighscale, process control, scientific, and medicalapplications.To accommodate these applications, the ADCs come aseither two-channel (CS5531/32) or four-channel(CS5533/34) devices and include a very low noise chop-per-stabilized instrumentation amplifier (6 nV/√Hz @ 0.1Hz) with selectable gains of 1×, 2×, 4×, 8×, 16×, 32×, and64×. These ADCs also include a fourth order ∆Σ modu-lator followed by a digital filter which provides twentyselectable output word rates of 6.25, 7.5, 12.5, 15, 25, 30,50, 60, 100, 120, 200, 240, 400, 480, 800, 960, 1600,1920, 3200, and 3840 Sps (MCLK=4.9152MHz).To ease communication between the ADCs and a micro-controller, the converters include a simple three-wire se-rial interface which is SPI and Microwire compatible witha Schmitt-trigger input on the serial clock (SCLK).High dynamic range, programmable output rates, andflexible power supply options makes these ADCs idealsolutions for weigh scale and process controlapplications.ORDERING INFORMATIONSee page47

PreliminaryProductInformationThisdocumentcontainsinformationforanewproduct.CirrusLogicreservestherighttomodifythisproductwithoutnotice.

1Copyright©CirrusLogic,Inc.2002(AllRightsReserved)CirrusLogic,Inc.P.O.Box17847,Austin,Texas78760(512)4457222FAX:(512)4457581

CS8405A

96kHzDigitalAudioInterfaceTransmitterFeatures

󰀁CompleteEIAJCP1201,IEC-60958,AES3,

S/PDIFcompatibletransmitter

󰀁+5VDigitalSupply(VD)

󰀁+3Vto5VDigitalInterface(VL)

󰀁On-chipChannelStatusandUserbitbuffer

memoriesallowblocksizedupdates

󰀁Flexible3-wireserialdigitalaudioinputport

󰀁Upto96kHzframerate

󰀁MicrocontrollerwriteaccesstoChannel

StatusandUserbitdata

󰀁On-chipdifferentiallinedriver

󰀁GeneratesCRCcodesandparitybits

󰀁Standalonemodeallowsusewithouta

microcontrollerGeneralDescription

TheCS8405AisamonolithicCMOSdevicewhichen-

codesandtransmitsaudiodataaccordingtotheAES3,

DIS

CONTINUED PRODUCT

— FOR REFERENCE ONLYDesigned specifically to meet the requirement for extended opera-tion of battery-powered equipment such as cordless and cellular tele-phones, the A8405SLH voltage regulators offer the reduced dropoutvoltage and quiescent current essential for maximum battery life.Applicable also to palmtop computers and personal data assistants,these devices deliver a regulated output at up to 200 mA (transient),which is internally limited, providing short-circuit protection. Regu-lated output voltages of 2.7, 2.8, 3.0, 3.2, 3.3, 3.6, 3.8, 4.0, and 5.0 Vare currently provided. Other voltages, down to 2.0 volts, are availableon special order.A PMOS pass element provides a typical dropout voltage of only100 mV at 100 mA of load current. The low dropout voltage permitsdeeper battery discharge before output regulation is lost. Quiescentcurrent does not increase significantly as the dropout voltage is ap-proached, an ideal feature in standby/resume power systems where dataintegrity is crucial. Regulator accuracy and excellent temperaturecharacteristics are provided by a bandgap reference. The A8405SLHincludes an ENABLE input to give the designer complete control overpower up, standby, or power down.These devices are supplied in a thermally enhanced 5-lead small-outline plastic package similar to the SOT-23, and fitting the SC-74Afootprint. All devices are rated for operation over a temperature rangeof -20°C to +85°C.FEATURES AND BENEFITSIHigh Efficiency Provides Extended Battery LifeI100 mV Typical Dropout Voltage at IO = 100 mAI80 µA Typical Quiescent CurrentILow Output NoiseI200 mA Current-Limited OutputIImproved PSRR and Transient PerformanceAPPLICATIONSICordless/Cellular/GSM/PHS TelephonesIPersonal Data AssistantsIPersonal CommunicatorsIPalmtop ComputersIGPSIPagersLOW-DROPOUT REGULATORS— HIGH EFFICIENCYData Sheet27468.22PRELIMINARY INFORMATION(subject to change without notice)June 25, 1999

In-Sight®8405

VisionSystem

ReferenceGuide

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