MAX11040K, MAX11060* 24-/16-Bit, 4-Channel, Simultaneous-Sampling, Cascadable, Sigma-Delta ADCs - Maxim Integrated Products - #1

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General Description The MAX11040K/MAX11060 are 24-/16-bit, 4-channel, simultaneous-sampling, sigma-delta analog-to-digital converters (ADCs). The devices allow simultaneous sampling of as many as 32 channels using a built-in cascade feature to synchronize as many as eight devices. The serial interface of the devices allows reading data from all the cascaded devices using a single command. Four modulators simultaneously convert each fully differential analog input with a programmable data output rate ranging from 0.25ksps to 64ksps. The devices achieve 106dB SNR at 16ksps and 117dB SNR at 1ksps (MAX11040K). The devices operate from a single +3V supply. The differential analog input range is ±2.2V when using the internal reference; an external reference is optional. Each input is overvoltage protected up to ±6V without damage. The devices use an internal crystal oscillator or an external source for clock. The devices are compatible with SPI™, QSPI™, MICROWIRE™, and DSP-compatible 4-wire serial interfaces. An on-board interface logic allows one serial interface (with a single chip select) to control up to eight cascaded devices or 32 simultaneous sampling analog input channels. The devices are ideally suited for power-management systems. Each channel includes an adjustable sampling phase enabling internal compensation for phase shift due to external dividers, transformers, or filters at the inputs. The output data rate is adjustable with a 0.065% resolution (at 16ksps or below) to track the varying frequency of a periodic input. A SYNC input allows periodic alignment of the conversion timing of multiple devices with a remote timing source. The devices are available in a 38-pin TSSOP package specified over the -40°C to +105°C industrial temperature range. Applications Power-Protection Relay Equipment Multiphase Power Systems Industrial Data-Acquisition Systems Medical Instrumentation Features Four Fully Differential Simultaneously Sampled Channels Cascadable for Up to 32 Channels of Simultaneous Sampling 106dB (MAX11040K) SNR at 16ksps 117dB (MAX11040K) SNR at 1ksps 0.25% Error Over a 1000:1 Dynamic Range, Processed Over 16.7ms (MAX11040K) ±2.2V Full-Scale Input Range ±6V Overvoltage Protected Inputs Internal Crystal Oscillator 2.5V, 50ppm/°C Internal Reference or External Reference Programmable Output Data Rate 0.25ksps to 64ksps Range 0.065% Resolution Programmable Sampling Phase 0 to 333ìs Delay in 1.33ìs Steps SPI-/QSPI-/MICROWIRE-/DSP-Compatible 4-Wire Serial Interface Cascadable Interface Allows Control of Up to Eight Devices with a Single CS Signal 3.0V to 3.6V Analog Supply Voltage 2.7V to VAVDD Digital Supply Voltage 38-Pin TSSOP Package MAX11040K/MAX11060 24-/16-Bit, 4-Channel, Simultaneous-Sampling, Cascadable, Sigma-Delta ADCs ________________________________________________________________ Maxim Integrated Products 1 19-5741; Rev 0; 2/11 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. EVALUATION KIT AVAILABLE Ordering Information +Denotes a lead(Pb)-free/RoHS-compliant package. *Future product—contact factory for availability. PART TEMP RANGE PIN-PACKAGE MAX11040KGUU+ -40°C to +105°C 38 TSSOP MAX11060GUU+* -40°C to +105°C 38 TSSOP MICROWIRE is a trademark of National Semiconductor Corp. SPI/QSPI are trademarks of Motorola, Inc. MAX11040K MAX11060 24-/16-BIT ADC DIGITAL FILTER 2.5V REFERENCE CRYSTAL REFIO OSCILLATOR AIN3+ AIN3- REF3 24-/16-BIT ADC DIGITAL FILTER AIN2+ AIN2- REF2 24-/16-BIT ADC DIGITAL FILTER AIN1+ AIN1- REF1 24-/16-BIT ADC DIGITAL FILTER AIN0+ AIN0- REF0 REGISTERS AND DIGITAL CONTROL SERIAL INTERFACE DOUT DIN SCLK CS CASCOUT CASCIN DRDYOUT DRDYIN SYNC OVRFLW FAULT AGND XIN XOUT CLKOUT DGND Functional Diagram