ADS1205

ADS1205 SBAS312B − JANUARY 2005 − REVISED AUGUST 2007 Two 1ĆBit, 10MHz, 2ndĆOrder DeltaĆSigma Modulators FEATURES D 16-Bit Resolution D 14-Bit Linearity D ±2.5V Input Range at 2.5V D Internal Reference Voltage: 2% D Gain Error: 0.5% D Two Independent Delta-Sigma Modulators D Two Input Reference Buffers D On-Chip 20MHz Oscillator D Selectable Internal or External Clock D Operating Temperature Range: −40°C to +85°C D QFN-24 (4x4) Package APPLICATIONS D Motor Control D Current Measurement D Industrial Process Control D Instrumentation D Resolver DESCRIPTION The ADS1205 is a two-channel, high-performance, delta-sigma (∆Σ) modulator with more than 98dB dynamic range, operating from a single +5V supply. The differential inputs are ideal for direct connection to transducers in an industrial environment. With the appropriate digital filter and modulator rate, the device can be used to achieve 16-bit analog-to-digital (A/D) conversion with no missing codes. Effective resolution of 14 bits can be obtained with a digital filter bandwidth of 40kHz at a modulator rate of 10MHz. The ADS1205 is designed for use in high-resolution measurement applications including current measurements, smart transmitters, industrial process control, and resolvers. It is available in a QFN-24 (4x4) package. CH A+ CH A− REFIN A CH B+ CH B− REFIN B AVDD 2nd−Order ∆Σ Modulator 2nd−Order ∆Σ Modulator BVDD Output Interface Circuit OUT A OUT B C LK OUT Divider Clock Select C LK IN C LK SE L REFOUT Refer...