Cirrus-logic CS5374 Manuale Utente

Copyright  Cirrus Logic, Inc. 2010(All Rights Reserved)Preliminary Product InformationThis document contains information for a new product. Cirrus Lo

CS5374CS537410DIGITAL CHARACTERISTICS Notes: 21. Device is intended to be driven with CMOS logic levels.22. Guaranteed by design and/or characterizati

CS5374CS537411DIGITAL CHARACTERISTICS (CONT.) Notes: 23. MCLK is generated by the CS5376A digital filter. If MCLK is disabled, the CS5374 device autom

CS5374CS537412SPI™ INTERFACE TIMING (EXTERNAL MASTER) Parameter Symbol Min Typ Max UnitSDI Write TimingCS Enable to Valid Latch Clock t160 - - nsDat

CS5374CS537413POWER SUPPLY CHARACTERISTICS Notes: 26. All outputs unloaded. Digital inputs forced to VD or GND respectively. Amplifier inputs connecte

CS5374CS5374142. GENERAL DESCRIPTIONThe CS5374 combines two marine seismic analogmeasurement channels into one 7 mm x 7 mm QFNpackage. Each measuremen

CS5374CS537415Figure 11. CS5374 Connection DiagramAINA1+INA1-MUX1MUX2INB1-INB1+GUAR D1+--+400 Ω 400 ΩINB2+INB2-INA2-INA2++--+400 Ω 400 ΩReset, Clock,

CS5374CS5374163. AMPLIFIER OPERATIONThe CS5374 high-impedance, low-noise CMOSdifferential input, differential output amplifiers areoptimized for preci

CS5374CS537417selected differential input signal, and will vary asthe signal common mode varies. The GUARD out-put will not drive a significant load,

CS5374CS5374184. MODULATOR OPERATIONThe CS5374 modulators are fourth-order ΔΣ typeoptimized for extremely high-resolution measure-ment of signals betw

CS5374CS5374194.2 Modulator Inputs — INR, INFThe modulator analog inputs are separated into dif-ferential rough and fine signals (INR±, INF±) tomaximi

CS5374CS53742TABLE OF CONTENTS1. CHARACTERISTICS AND SPECIFICATIONS ... 4SPECIFIED

CS5374CS537420offset and the modulator internal offset are re-moved from the final conversion result.4.4 Modulator Stability — MFLAGThe CS5374 ΔΣ modu

CS5374CS5374215. SPITM SERIAL PORTThe CS5374 SPI interface is a slave serial port de-signed to interface with the CS5376A SPI 2 port.SPI commands from

CS5374CS537422SCLKSDIFigure 16. CS5374 (Slave) Serial Transactions with CS5376A (Master)CSSDOCycleSDI0x02 ADDR DATASDOSDISDOCS5374 SPI Write from CS5

CS5374CS5374235.3 SPI RegistersThe CS5374 SPI registers are 8-bit registers thatcontrol the CS5374 hardware configuration. See“SPITM Register Summary”

CS5374CS5374245.3.4 ADCCFG — 0x03The ADCCFG register can disable modulatorOFST and enable HP mode. It also enables PWDNmode for the channel 1 & 2

CS5374CS5374255.5 Example: CS5374 Configuration by the CS5376A SPI 2 PortThe CS5374 SPI port was designed to connect tothe CS5376A secondary SPI 2 por

CS5374CS537426The SPI2DAT register is 24-bits wide and can con-tain up to three bytes of data to follow the SPI op-code and address. For configuring t

CS5374CS537427Transaction CS5376A Primary SPI 1 Write Description01 MOSI: 02 | 03 | 00 00 01 | 00 00 11 | 00 02 02MISO: ----------------------

CS5374CS537428Table 8. Example CS5376A SPI 1 Transactions to Write the CS5374 PWRCFG RegisterTransaction CS5376A Primary SPI 1 Write Description01 MOS

CS5374CS5374296. POWER MODESThe CS5374 amplifiers and modulators have threepower modes. Normal operation, power down withMCLK enabled, and power down

CS5374CS537438.4 PCB Layers and Routing... 338.5 Power Sup

CS5374CS5374307. VOLTAGE REFERENCEThe CS5374 modulators require a 2.500 V preci-sion voltage reference to be supplied to the VREF±pins.7.1 VREF Power

CS5374CS5374311 / [(2.048 MHz) x (15 pF)] = 32 kΩ. While thesize of the internal capacitor is fixed, the voltagereference input impedance can vary wit

CS5374CS5374328. POWER SUPPLIESThe CS5374 has two positive analog power supplypins (VA+), two negative analog power supplypins (VA–), a digital power

CS5374CS537433regulator output, with additional power supplybulk capacitance placed among the analog compo-nent route if space permits.8.4 PCB Layers

CS5374CS5374349. SPITM REGISTER SUMMARYThe CS5374 Configuration Registers containthe hardware configuration settings.Name Addr. Type # Bits Descriptio

CS5374CS5374359.1 VERSION: 0x00(MSB)7654321(LSB)0VER7 VER6 VER5 VER4 VER3 VER2 VER1 VER0RRRRRRRR01000001Figure 20. Hardware Version ID Register VERSI

CS5374CS5374369.2 AMP1CFG: 0x01(MSB)7654321(LSB)0PWDN1 HP1 MUX1_1 MUX1_0 GUARD GAIN1_2 GAIN1_1 GAIN1_0R/W R/W R/W R/W R/W R/W R/W R/W00000000Figure 21

CS5374CS5374379.3 AMP2CFG: 0x02(MSB)7654321(LSB)0PWDN2 HP2 MUX2_1 MUX2_0 --- GAIN2_2 GAIN2_1 GAIN2_0R/W R/W R/W R/W R/W R/W R/W R/W00000000Figure 22.

CS5374CS5374389.4 ADCCFG: 0x039.5 PWRCFG: 0x04(MSB)7654321(LSB)0OFSTHP PWDN2 PWDN1 --- --- --- ---R/W R/W R/W R/W R/W R/W R/W R/W00000000Figure 23. M

CS5374CS537439(MSB)7654321(LSB)0adc_lpwr --- amp_i1_1 amp_i1_0 rough i1_tail amp_i5_1 amp_i5_0R/W R/W R/W R/W R/W R/W R/W R/W00000000Figure 24. Power

CS5374CS537441. CHARACTERISTICS AND SPECIFICATIONS• Min/Max characteristics and specifications are guaranteed over the Specified Operating Conditions.

CS5374CS53744010. PIN DESCRIPTIONS PinNamePinNumberPinTypePinDescriptionPower SuppliesVA+VA–6, 397, 40IAnalog power supply. Refer to the Specifie

CS5374CS537441Differential Amplifier Analog OutputsOUT1–,OUT1+4647OChannel 1 differential analog output.GUARD1 48 OGuard output voltage for analog inp

CS5374CS53744211. PACKAGE DIMENSIONS 48-PIN QFN (7MM X 7MM)

CS5374CS53744312. ORDERING INFORMATION 13. ENVIRONMENTAL, MANUFACTURING, & HANDLING INFORMATION* MSL (Moisture Sensitivity Level) as specified byI

CS5374CS53744414. REVISION HISTORY Revision Date ChangesT1 AUG 2008 Initial release of Target data sheet.A1 DEC 2008 Initial release of Advanced dat

CS5374CS53745THERMAL CHARACTERISTICS ANALOG CHARACTERISTICS Notes: 7. Common mode signals pass through the differential amplifier architecture and are

CS5374CS53746ANALOG CHARACTERISTICS (CONT.) Notes: 9. The upper bandwidth limit is determined by the selected digital filter cut-off frequency.10. An

CS5374CS53747PERFORMANCE SPECIFICATIONS Notes: 12. Dynamic Range defined as 20 log [(RMS full scale) / (RMS idle noise)] where idle noise is measure

CS5374CS53748PERFORMANCE SPECIFICATIONS (CONT.) Notes: 14. Channel Gain is the nominal full-scale 24-bit output code from the CS5376A digital filter f

CS5374CS53749CHANNEL PERFORMANCE PLOTS Figure 3. CS5374 Noise Performance (1x Gain)Figure 4. CS5374 + CS4373A Test DAC Dynamic Performance