Differential Input, Quad, External Reference Simultaneous Sampling, 16-Bit, SAR ADC Preliminary Technical Data AD7380-4 FEATURES FUNCTIONAL BLOCK DIAGRAM V V REFIO REFGND CC LOGIC 16-bit ADC family Quad simultaneous sampling AD7380-4 REGCAP LDO Fully differential analog inputs A A+ IN High throughput rate: 4 MSPS OVER- ADC A OSC SAMPLING A A IN SNR: 91 dB (typical) at V = 3.3 V REF SDOA On-chip oversampling function A B+ IN OVER- SDOB ADC B SAMPLING SNR: 98.6 dB (typical) with OSR = 8, RES = 1 INTERFACE A B IN SDOC AND 2-bit resolution boost CONTROL SDOD/ALERT A C+ LOGIC IN SCLK OVER- ALERT Out of range indicator ( ) ADC C SAMPLING SDI A C IN INL: 2 LSBs (maximum) CS A D+ High-speed serial interface IN OVER- ADC D SAMPLING A D Temperature range: 40C to +125C IN 4 mm 4 mm, 24-lead LFCSP GND GND APPLICATIONS Figure 1. Motor control position feedback Motor control current sense Data acquisition systems Erbium doped fiber amplifier (EDFA) applications In phase and quadrature demodulation GENERAL DESCRIPTION The AD7380-4 is a 16-bit compatible, quad, simultaneous Table 1. Related Devices sampling, high speed, successive approximation register (SAR), No of Channels Input Type 16 Bits 14 Bits analog-to-digital converters (ADC) operating from a 3.3 V 4 Differential AD7380-4 AD7381-4 power supply with throughput rates up to 4 MSPS. The AD7389-4 differential analog input accepts a wide common-mode input 2 Differential AD7380 AD7381 voltage and is sampled and converted on the falling edge of CS. AD4680 AD4681 The AD7380-4 has on-chip oversampling blocks to improve dynamic range and reduce noise at lower bandwidths. The Single-ended AD7386 AD7387 oversampling can boost up to two bits of added resolution. The PRODUCT HIGHLIGHTS REFIO pin can have a reference voltage of up 3.3 V. 1. Quad simultaneous sampling and conversion The conversion process and data acquisition use standard 2. Pin-compatible product family. control inputs allowing easy interfacing to microprocessors or 3. High throughput rate, 4 MSPS at 16-bit. digital signal processors (DSPs). The conversion result can 4. Space-saving, 4 mm 4 mm LFCSP. clock out simultaneously via 4-wire mode for faster 5. Integrated oversampling block to increase dynamic range, throughput, or via 1-wire serial mode when slower throughput reduce noise and reduce SCLK speed requirements. is allowed. The device is compatible with 1.8 V, 2.5 V, and 3.3 V 6. Differential analog inputs with wide common-mode range. interfaces using the separate logic supply. 7. Small sampling capacitor reduces amplifier drive burden. The AD7380-4 is available in a 24-lead lead frame chip scale package (LFCSP) and operates over a temperature range of 40C to +125C. Rev. 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Trademarks and registered trademarks are the property of their respective owners. 20802-001AD7380-4 Preliminary Technical Data TABLE OF CONTENTS Features .............................................................................................. 1 Oversampling ............................................................................. 17 Applications ...................................................................................... 1 Resolution Boost ........................................................................ 19 Functional Block Diagram .............................................................. 1 Alert.............................................................................................. 19 General Description ......................................................................... 1 Power Modes .............................................................................. 20 Product Highlights ........................................................................... 1 External Reference ..................................................................... 20 Specifications .................................................................................... 3 Software Reset ............................................................................. 20 Timing Specifications .................................................................. 5 Diagnostic Self Test .................................................................... 20 Absolute Maximum Ratings ........................................................... 8 Interface ........................................................................................... 21 Thermal Resistance ...................................................................... 8 Reading Conversion Results ..................................................... 21 Electrostatic Discharge (ESD) Ratings ...................................... 8 Low Latency Readback .............................................................. 22 ESD Caution.................................................................................. 8 Reading from Device Registers ................................................ 23 Pin Configuration and Function Descriptions ............................ 9 Writing to Device Registers ...................................................... 23 Typical Performance Characteristics ........................................... 10 CRC .............................................................................................. 23 Terminology .................................................................................... 13 Registers ........................................................................................... 26 Theory of Operation ...................................................................... 14 Addressing Registers .................................................................. 26 Circuit Information ................................................................... 14 Configuration 1 Register ........................................................... 27 Converter Operation .................................................................. 14 Configuration 2 Register ........................................................... 28 Analog Input Structure .............................................................. 14 Alert Indication Register ........................................................... 28 ADC Transfer Function ............................................................ 15 Alert Low Threshold Register .................................................. 29 Applications Information .............................................................. 16 Alert High Threshold Register ................................................. 30 Power Supply .............................................................................. 16 Outline Dimensions ....................................................................... 31 Modes of Operation ....................................................................... 17 Rev. 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