Synchronous Demodulator and Configurable Analog Filter Data Sheet ADA2200 FEATURES FUNCTIONAL BLOCK DIAGRAM VDD Demodulates signal input bandwidths to 30 kHz Programmable filter enables variable bandwidths ADA2200 Filter tracks input carrier frequency INP OUTP PROGRAM 8 FILTER Programmable reference clock frequency INN OUTN LPF Flexible system interface f VOCM M Single-ended/differential signal inputs and outputs V 90 CM f f SI SO Rail-to-rail outputs directly drive analog-to-digital m n+1 CLKIN 2 8 2 RCLK/SDO converters (ADCs) SCLK/SCL Phase detection sensitivity of 9.3m rms 2 REL CLOCK CONTROL SPI/I C SDIO/SDA GEN REGISTERS MASTER XOUT Configurable with 3-wire and 4-wire serial port interface (SPI) or CS/A0 2 seamless boot from I C EEPROMs Very low power operation SYNCO GND RST BOOT 395 A at f = 500 kHz CLKIN Figure 1. Single supply: 2.7 V to 3.6 V Specified temperature range: 40C to +85C 16-lead TSSOP package APPLICATIONS Synchronous demodulation Sensor signal conditioning Lock-in amplifiers Phase detectors Precision tunable filters Signal recovery Control systems GENERAL DESCRIPTION 1 The ADA2200 is a sampled analog technology synchronous components of the signal chain. The low power consumption and demodulator for signal conditioning in industrial, medical, and rail-to-rail operation is ideal for battery-powered and low communications applications. The ADA2200 is an analog input, voltage systems. sampled analog output device. The signal processing is performed The ADA2200 can be programmed over its SPI-compatible entirely in the analog domain by charge sharing among capacitors, serial port or can automatically boot from the EEPROM which eliminates the effects of quantization noise and rounding 2 through its I C interface. On-chip clock generation produces a errors. The ADA2200 includes an analog domain, low-pass mixing signal with a programmable frequency and phase. In decimation filter, a programmable infinite impulse response addition, the ADA2200 synchronization output signal eases (IIR) filter, and a mixer. This combination of features reduces interfacing to other sampled systems, such as data converters ADC sample rates and lowers the downstream digital signal and multiplexers. processing requirements. The ADA2200 is available in a 16-lead TSSOP package. Its The ADA2200 acts as a precision filter when the demodulation performance is specified over the industrial temperature range function is disabled. The filter has a programmable bandwidth of 40C to +85C. Note that throughout this data sheet, and tunable center frequency. The filter characteristics are highly multifunction pins, such as SCLK/SCL, are referred to either by stable over temperature, supply, and process variation. the entire pin name or by a single function of the pin, for Single-ended and differential signal interfaces are possible on both example, SCLK, when only that function is relevant. input and output terminals, simplifying the connection to other 1 Patent pending. Rev. 0 Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 2014 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. 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Technical Support www.analog.com 12295-001ADA2200 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Input and Output Amplifiers .................................................... 15 Applications ....................................................................................... 1 Applications Information .............................................................. 16 Functional Block Diagram .............................................................. 1 Amplitude Measurements ......................................................... 16 General Description ......................................................................... 1 Phase Measurements .................................................................. 16 Revision History ............................................................................... 2 Amplitude and Phase Measurements ...................................... 16 Specifications ..................................................................................... 3 Analog Output Systems ............................................................. 17 SPI Timing Characteristics ......................................................... 4 Interfacing to ADCs ................................................................... 17 Absolute Maximum Ratings ............................................................ 7 Lock-In Amplifier Application ................................................. 17 Thermal Resistance ...................................................................... 7 Interfacing to Microcontrollers ................................................ 18 ESD Caution .................................................................................. 7 EEPROM Boot Configuration .................................................. 18 Pin Configuration and Function Descriptions ............................. 8 Power Dissipation....................................................................... 18 Typical Performance Characteristics ............................................. 9 Device Configuration .................................................................... 19 Terminology .................................................................................... 10 Serial Port Operation ................................................................. 19 Theory of Operation ...................................................................... 11 Data Format ................................................................................ 19 Synchronous Demodulation Basics ......................................... 11 Serial Port Pin Descriptions ...................................................... 19 ADA2200 Architecture .............................................................. 12 Serial Port Options ..................................................................... 19 Decimation Filter........................................................................ 12 Booting from EEPROM ............................................................ 20 IIR Filter ....................................................................................... 13 Device Configuration Register Map and Descriptions ............. 21 Mixer ............................................................................................ 13 Outline Dimensions ....................................................................... 24 Clocking Options ....................................................................... 14 Ordering Guide ............................................................................... 24 REVISION HISTORY 8/14Revision 0: Initial Version Rev. 0 Page 2 of 24