ADS1015IDGSR Integrated Circuits (ICs)

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1. Description

The ADS1013, ADS1014, and ADS1015IDGSR devices (ADS101x) are precision, low-power, 12-bit, I2Ccompatible, analog-to-digital converters (ADCs) offered in an ultra-small, leadless, X2QFN-10 package, and a VSSOP-10 package. The ADS101x devices incorporate a low-drift voltage reference and an oscillator. The ADS1014 and ADS1015 also incorporate a programmable gain amplifier (PGA) and a digital comparator. These features, along with a wide operating supply range, make the ADS101x well suited for power- and space-constrained, sensor measurement applications. The ADS101x perform conversions at data rates up to 3300 samples per second (SPS). The PGA offers input ranges from ±256 mV to ±6.144 V, allowing precise large- and small-signal measurements. The ADS1015 features an input multiplexer (MUX) that allows two differential or four single-ended input measurements. Use the digital comparator in the ADS1014 and ADS1015 for under- and overvoltage detection. The ADS101x operate in either continuousconversion mode or single-shot mode. The devices are automatically powered down after one conversion in single-shot mode; therefore, power consumption is significantly reduced during idle periods.

2. Features

    1. Ultra-Small X2QFN Package: 2 mm × 1.5 mm × 0.4 mm

    2. 12-Bit Noise-Free Resolution

    3. Wide Supply Range: 2.0 V to 5.5 V

    4. Low Current Consumption: 150 μA(Continuous-Conversion Mode)

    5. Programmable Data Rate: 128 SPS to 3.3 kSPS

    6. Single-Cycle Settling

    7. Internal Low-Drift Voltage Reference

    8. Internal Oscillator

    9. I2C Interface: Four Pin-Selectable Addresses

  10. Four Single-Ended or Two Differential Inputs

  11. Programmable Comparator

  12. Operating Temperature Range: –40°C to +125°C

3. Applications

    1. Portable Instrumentation

    2. Battery Voltage and Current Monitoring

    3. Temperature Measurement Systems

    4. Consumer Electronics

    5. Factory Automation and Process Control

4. Pin Configuration

5. Pin Functions

6. Multiplexer

The ADS1015 contains an input multiplexer (MUX), as shown in Figure 10. Either four single-ended or two differential signals can be measured. Additionally, AIN0 and AIN1 may be measured differentially to AIN3. The multiplexer is configured by bits MUX[2:0] in the Config register. When single-ended signals are measured, the negative input of the ADC is internally connected to GND by a switch within the multiplexer. The ADS1013 and ADS1014 do not have an input multiplexer and can measure either one differential signal or one single-ended signal. For single-ended measurements, connect the AIN1 pin to GND externally. In subsequent sections of this data sheet, AINP refers to AIN0 and AINN refers to AIN1 for the ADS1013 and ADS1014. Electrostatic discharge (ESD) diodes connected to VDD and GND protect the ADS101x analog inputs. Keep the absolute voltage of any input within the range shown in Equation 1 to prevent the ESD diodes from turning on.

7. Analog Inputs

The ADS101x use a switched-capacitor input stage where capacitors are continuously charged and then discharged to measure the voltage between AINP and AINN. The frequency at which the input signal is sampled is called the sampling frequency or the modulator frequency (fMOD). The ADS101x has a 1-MHz internal oscillator that is further divided by a factor of 4 to generate fMOD at 250 kHz. The capacitors used in this input stage are small, and to external circuitry, the average loading appears resistive. Figure 11 shows this structure. The capacitor values set the resistance and switching rate. Figure 12 shows the timing for the switches in Figure 11. During the sampling phase, switches S1 are closed. This event charges CA1 to V(AINP), CA2 to V(AINN), and CB to (V(AINP) – V(AINN)). During the discharge phase, S1 is first opened and then S2 is closed. Both CA1 and CA2 then discharge to approximately 0.7 V and CB discharges to 0 V. This charging draws a very small transient current from the source driving the ADS101x analog inputs. The average value of this current can be used to calculate the effective impedance (Zeff), where Zeff = VIN / IAVERAGE.

8. Oscillator

The ADS101x have an integrated oscillator running at 1 MHz. No external clock can be applied to operate these devices. The internal oscillator drifts over temperature and time. The output data rate scales proportionally with the oscillator frequency.

9. Digital Comparator

The ADS1015 and ADS1014 feature a programmable digital comparator that can issue an alert on the ALERT/RDY pin. The COMP_MODE bit in the Config register configures the comparator as either a traditional comparator or a window comparator. In traditional comparator mode, the ALERT/RDY pin asserts (active low by default) when conversion data exceeds the limit set in the high-threshold register (Hi_thresh). The comparator then deasserts only when the conversion data falls below the limit set in the low-threshold register (Lo_thresh). In window comparator mode, the ALERT/RDY pin asserts when the conversion data exceed the Hi_thre