Fast 16-bit octal SAR ADC with wide input bandwidth
It has a flexible analogue front end that accepts fully differential, unipolar or bipolar analogue input signals, as well as arbitrary input signals, and maintains an 82 dB signal-to-noise ratio (SNR) and high common mode rejection ratio (CMRR) of 102 dB, when sampling input signals up to the Nyquist frequency. This wide input bandwidth of the LTC2320 allows the digitization of input signals up to the Nyquist frequency of 750 kHz.
The LTC2320-16 integrates a precision bandgap reference with low drift and guaranteed 20 ppm/ºC maximum temperature coefficient into a 55 mm² QFN-52 package, saving space in high density designs. Alternatively, the internal reference can be overdriven by up to four separate external references for each pair of two channels, to match the input range of the application. The LTC2320-16 samples three times faster and offers the lowest power dissipation of any octal SAR ADC on the market.
In commercial, industrial and automotive (–40°C to 125°C) temperature grades, pricing begins at $16.50 (1,000). The DC2395A evaluation board for the LTC2320 SAR ADC family is available at www.linear.com/demo
Linear Technology; www.linear.com/product/LTC2320-16
next page; feature listing…
Summary of Features: LTC2320-16
1.5 Msps/ch throughput rate
Eight simultaneous sampling channels
±2 LSB INL (typ)
Guaranteed 16-bit, no missing codes
8.192 VP-P true differential inputs with rail-to-rail common mode
82 dB SNR (typ) at fIN = 500 kHz
–90 dB THD (typ) at fIN = 500 kHz
Guaranteed operation to 125°C
Single 3.3V or 5V supply
Low drift (20 ppm/°C Max) 2.048V or 4.096V internal reference
1.8V to 2.5V I/O voltages
CMOS or LVDS SPI-compatible serial I/O
Power dissipation 20 mW/ch (typ, 5V operation)
Small 52-pin 7 × 8 mm QFN package
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