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)

Configurable with 3-wire and 4-wire serial port interface (SPI) or

Very low power operation

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 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

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

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

MASTER

÷8

90°

XOUT

CLKIN

SYNCO

GND

RST

BOOT

ADA2200

Rev. 0

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