Buffered 8-Channel, 16-Bit, 800ksps Differential ±10.24V ADC with 30V Common Mode Range

The LTC2333-16 is a 16-bit, low noise 8-channel multiplexed successive approximation register (SAR) ADC with buffered differential, wide common mode range picoamp inputs. Operating from a 5V low voltage supply, flexible high voltage supplies, and using the internal reference and buffer, this SoftSpan™ ADC can be configured on a conversion-by-conversion basis to accept ±10.24V, 0V to 10.24V, ±5.12V, or 0V to 5.12V signals on any channel. Alternately, the ADC may be programmed to cycle through a sequence of channels and ranges without further user intervention.

The integrated picoamp-input analog buffers, wide input common mode range and 128dB CMRR of the LTC2333- 16 allow the ADC to directly digitize a variety of signals using minimal board space and power. This input signal flexibility, combined with ±1LSB INL, no missing codes at 16 bits, and 94.2dB SNR, makes the LTC2333-16 an ideal choice for many high voltage applications requiring wide dynamic range.

The LTC2333-16 supports pin-selectable SPI CMOS (1.8V to 5V) and LVDS serial interfaces.

Applications

* Direct Sensor Measurement

* Programmable Logic Controllers

* Industrial Process Control

* Test and Measurement

* Eight Buffered Multiplexed Channels

* 800ksps Throughput

* 500pA/12nA Maximum Input Leakage at 85°C/125°C

* ±1LSB INL (Maximum ±10.24V Range)

* Guaranteed 16-Bit, No Missing Codes

* Differential, Wide Common Mode Range Inputs

* 8-Channel Multiplexer with SoftSpan Input Ranges:

* ±10.24V, 0V to 10.24V, ±5.12V, 0V to 5.12V

* ±12.5V, 0V to 12.5V, ±6.25V, 0V to 6.25V

* 94.2dB Single-Conversion SNR (Typical)

* −110dB THD (Typical) at fIN = 2kHz

* 128dB CMRR, –125dB Active Crosstalk (Typical)

* 420ns Step Response (Full-Scale, 0.005% Settling)

* Rail-to-Rail Input Overdrive Tolerance

* Programmable Sequencer with No-Latency Control

* Integrated Reference and Buffer (4.096V)

* SPI CMOS (1.8V to 5V) and LVDS Serial I/O

* 268mW Power Dissipation (Typical)

* 48-Lead (7mm × 7mm) LQFP Package