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Synchronous Demodulator
and Configurable Analog Filter
Data Sheet
ADA2200
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°
θ
REL
rms
Configurable with 3-wire and 4-wire serial port interface (SPI) or
seamless boot from I
2
C EEPROMs
Very low power operation
395 μA at f
CLKIN
= 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
FUNCTIONAL BLOCK DIAGRAM
Figure 1.
GENERAL DESCRIPTION
The ADA2200 is a sampled analog technology
1
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
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 I
2
C 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.
1
Patent pending.
INP
INN
OUTP
OUTN
VOCM
SCLK/SCL
SDIO/SDA
CS/A0
RCLK/SDO
VDD
LPF
8
PROGRAM
FILTER
CLOCK
GEN
CONTROL
REGISTERS
SPI/I
2
C
MASTER
V
CM
÷2
n+1
÷2
m
÷8
90°
f
SO
f
SI
f
M
XOUT
CLKIN
SYNCO
GND
RST BOOT
ADA2200
12295-001
Rev. 0 Document Feedback
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