The ADS816x is a family of 16-bit, 8-channel, high-precision successive approximation register (SAR) analog-to-digital converters (ADCs). The ADCs operate from a single 5V supply with a 1MSPS (ADS8168), 500kSPS (ADS8167), and 250kSPS (ADS8166) total throughput.
The input multiplexer supports extended settling time, which makes driving the analog inputs easier. The output of the multiplexer and ADC analog inputs are available as device pins. This configuration allows one ADC driver op amp to be used for all eight analog inputs of the multiplexer.
The ADS816x features a digital window comparator with programmable high and low alarm thresholds per analog input channel. The single op-amp solution with programmable alarm thresholds enables low power, low cost, and smallest form-factor applications.
PIN | FUNCTION | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
ADC-INM | 20 | Analog input | Negative ADC analog input. |
ADC-INP | 17 | Analog input | Positive ADC analog input. |
AIN0 | 9 | Analog input | Analog input channel 0. |
AIN1 | 10 | Analog input | Analog input channel 1. |
AIN2 | 11 | Analog input | Analog input channel 2. |
AIN3 | 12 | Analog input | Analog input channel 3. |
AIN4 | 13 | Analog input | Analog input channel 4. |
AIN5 | 14 | Analog input | Analog input channel 5. |
AIN6 | 15 | Analog input | Analog input channel 6. |
AIN7 | 16 | Analog input | Analog input channel 7. |
AIN-COM | 8 | Analog input | Common analog input. |
ALERT | 22 | Digital output | Digital ALERT output; active high. This pin is the output of the logical OR of the enabled channel ALERTs. |
AVDD | 32 | Power supply | Analog power-supply pin. Connect a 1µF capacitor from this pin to GND. |
CS | 23 | Digital input | Chip-select input pin; active low. The device starts converting the active input channel on the rising edge of CS. The device takes control of the data bus when CS is low. The SDO-x pins go Hi-Z when CS is high. |
DECAP | 2 | Power supply | Connect a 1µF capacitor to GND for the internal power supply. |
DVDD | 30 | Power supply | Interface power-supply pin. Connect a 1µF capacitor from this pin to GND. |
GND | 1, 21, 31 | Power supply | Ground. |
MUXOUT-M | 19 | Analog output | MUX negative analog output. |
MUXOUT-P | 18 | Analog output | MUX positive analog output. |
READY | 28 | Digital output | Multifunction output pin. When CS is held high, READY reflects the device conversion status. READY is low when a conversion is in process. When CS is low, the status of READY depends on the output protocol selection. |
REFby2 | 7 | Analog output | The output voltage on this pin is equal to half the voltage on the
REFP pin. Connect a 1µF capacitor from this pin to GND. |
REFIO | 3 | Analog input/output | External reference voltage input; internal
reference is a 4.096V output. Connect a 1µF capacitor from this pin to GND. |
REFM | 4 | Analog input | Reference ground potential; short this pin to GND externally. |
REFP | 5, 6 | Analog input/output | Reference buffer output, ADC reference input. Short pins 5 and 6 together. |
RST | 29 | Digital input | Asynchronous reset input pin. A low pulse on the RST pin resets the device. All register bits return to the default states. |
SCLK | 25 | Digital input | Clock input pin for the serial interface. All system-synchronous data transfer protocols are timed with respect to the SCLK signal. |
SDI | 24 | Digital input | Serial data input pin. This pin transfers data or commands into the device. |
SDO-0 | 26 | Digital output | Serial communication pin: data output 0. |
SDO-1/ SEQSTS | 27 | Digital output | Multifunction output pin. By default, this pin indicates the
channel scanning status in the auto and custom channel sequence
modes. In dual SDO data transfer mode, this pin functions as a serial communication pin: data output 1. |
Thermal pad | Supply | Exposed thermal pad; connect to GND. |