The ADS1602 modulator samples input signals with a 40MHz clock, while the digital filter decimates the modulator output by 16 to provide high resolution 16-bit output data at 2.5MSPS over a serial interface. Dynamic performance is excellent all the way up to the 1.23MHz passband transition. THD is less than -101dB, SFDR is greater than 103dB, while SNR is greater than 91dB.
The ADS1601 has the same advanced architecture and is optimized for applications requiring less aggressive data rates and lower power dissipation. The ADS1601 features 1.25MSPS data rate, 330mW power dissipation and unmatched high-speed performance: 92dB signal-to-noise ratio (SNR), -103dB total harmonic distortion (THD) and 105dB spurious-free dynamic range (SFDR). The ADS1601 is pin-compatible with the ADS1602.
"The easy-to-use ADS1601 and ADS1602 provide superior performance (SNR, SFDR and THD) compared to competitive 16-bit devices and allow customers to easily upgrade the performance of their designs," said David Russell, strategic marketing engineer for TI's oversampling data converter products. "The devices also represent the smallest, lowest power solutions within this performance segment."
The performance and value offered by the ADS1601 and ADS1602 build upon TI's portfolio of advanced delta-sigma data converters:
* ADS1605, ADS1606 -- Industry's fastest 16-bit delta-sigma ADCs (5MSPS) * ADS1625, ADS1626 -- Industry's fastest 18-bit delta-sigma ADCs (1.25 MSPS) * ADS1256 -- 24-bit delta-sigma ADC with best-in-class noise performance and speed * ADS1271 -- Widest bandwidth 24-bit industrial ADC combines DC accuracy with AC performance Technical Information
The ADS1601 and ADS1602 utilize oversampling topology which reduces clock jitter sensitivity during the sampling of high-frequency, large amplitude signals by a factor of four over that achieved by Nyquist-rate ADCs. A full- scale 3V differential input range makes out-of-range signals unlikely. The on-chip decimation filter stop band extends to 38.6MHz (ADS1601 = 19.3MHz), which greatly simplifies the anti-aliasing circuitry. The modulator samples the input signal up to 40MSPS (ADS1601 = 20MSPS) while the 16x decimation filter uses a series of half-band FIR filter stages to provide 75dB stop band attenuation and 0.001dB of passband ripple.
Output data is provided over a simple 3-wire serial interface, with a -3dB bandwidth of 1.23MHz (ADS1601 = 615kHz). The output data or its complementary format directly connects to DSPs, such as TI's TMS320(TM) family, as well as FPGAs or ASICs. A dedicated synchronization pin enables simultaneous sampling with multiple ADS1601s or ADS1602s in multi-channel systems.
Power dissipation is set by an external resistor and can be reduced when operating at slower speeds. The devices operate from a +5V analog supply and a +3V digital supply. The digital I/O supply operates from +2.7V to +5.25V, enabling the digital interface to support a range of logic families. All features are controlled by dedicated I/O pins.
The ADS1601 and ADS1602 are packaged in a 7mm x 7mm TQFP-48 and are available now from TI and its authorized distributors. The ADS1601 is priced at $14.00 in 1,000 piece quantities (suggested resale pricing). The ADS1602 is priced at $23.00 in 1,000 piece quantities. Evaluation modules for both devices are available.
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