ADA2200 Datasheet, PDF (1/25 Pages) Analog Devices – Demodulates signal input bandwidths to 30 kHz

Data Sheet
FEATURES
Demodulates signal input bandwidths to 30 kHz
Programmable filter enables variable bandwidths
Filter tracks input carrier frequency
Programmable reference clock frequency
Flexible system interface
Single-ended/differential signal inputs and outputs
Rail-to-rail outputs directly drive analog-to-digital
converters (ADCs)
Phase detection sensitivity of 9.3m°θREL rms
Configurable with 3-wire and 4-wire serial port interface (SPI) or
seamless boot from I²C EEPROMs
Very low power operation
395 μA at fCLKIN = 500 kHz
Single supply: 2.7 V to 3.6 V
Specified temperature range: −40°C to +85°C
16-lead TSSOP package
APPLICATIONS
Synchronous demodulation
Sensor signal conditioning
Lock-in amplifiers
Phase detectors
Precision tunable filters
Signal recovery
Control systems
GENERAL DESCRIPTION
The ADA2200 is a sampled analog technology¹ synchronous
demodulator for signal conditioning in industrial, medical, and
communications applications. The ADA2200 is an analog input,
sampled analog output device. The signal processing is performed
entirely in the analog domain by charge sharing among capacitors,
which eliminates the effects of quantization noise and rounding
errors. The ADA2200 includes an analog domain, low-pass
decimation filter, a programmable infinite impulse response
(IIR) filter, and a mixer. This combination of features reduces
ADC sample rates and lowers the downstream digital signal
processing requirements.
The ADA2200 acts as a precision filter when the demodulation
function is disabled. The filter has a programmable bandwidth
and tunable center frequency. The filter characteristics are highly
stable over temperature, supply, and process variation.
Single-ended and differential signal interfaces are possible on both
input and output terminals, simplifying the connection to other
1 _{Patent pending.}
Rev. 0
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Synchronous Demodulator
and Configurable Analog Filter
ADA2200
FUNCTIONAL BLOCK DIAGRAM
VDD
INP
INN
CLKIN
ADA2200
f_SI
÷2^m
8
LPF
f_SO
÷8
PROGRAM
FILTER
f_M
÷2ⁿ⁺¹
90° VCM
XOUT
CLOCK
GEN
CONTROL
REGISTERS
SPI/I²C
MASTER
OUTP
OUTN
VOCM
RCLK/SDO
SCLK/SCL
SDIO/SDA
CS/A0
SYNCO
GND
RST BOOT
Figure 1.
components of the signal chain. The low power consumption and
rail-to-rail operation is ideal for battery-powered and low
voltage systems.
The ADA2200 can be programmed over its SPI-compatible
serial port or can automatically boot from the EEPROM
through its I²C interface. On-chip clock generation produces a
mixing signal with a programmable frequency and phase. In
addition, the ADA2200 synchronization output signal eases
interfacing to other sampled systems, such as data converters
and multiplexers.
The ADA2200 is available in a 16-lead TSSOP package. Its
performance is specified over the industrial temperature range
of −40°C to +85°C. Note that throughout this data sheet,
multifunction pins, such as SCLK/SCL, are referred to either by
the entire pin name or by a single function of the pin, for
example, SCLK, when only that function is relevant.
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