Datasheet

12-Bit
ADC
DS
SPI
Interface
Voltage
Reference
Oscillator
CS
DIN
DOUT/
DRDY
SCLK
Gain = 2/3, 1,
2, 4, 8, or 16
PGA
Device
AIN1
AIN2
GND
AIN0
AIN3
VDD
MUX
Temperature
Sensor
ADS1018
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SBAS526B NOVEMBER 2012REVISED OCTOBER 2013
OVERVIEW
The ADS1018 is a very small, low-power, 12-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC). The
ADS1018 is extremely easy to configure and design into a wide variety of applications, and allows precise
measurements to be obtained with very little effort. Both experienced and novice users of data converters find
designing with the ADS1018 to be intuitive and problem-free.
The ADS1018 consists of a ΔΣ ADC core with adjustable gain, internal voltage reference, clock oscillator, and
SPI interface. This device is also a highly linear and accurate temperature sensor. All of these features are
intended to reduce required external circuitry and improve performance. Figure 9 shows the ADS1018 functional
block diagram.
The ADS1018 ADC core measures a differential signal (V
IN
) that is the difference of AIN
P
and AIN
N
. A
multiplexer (MUX) is available on the ADS1018. The converter core consists of a differential, switched-capacitor
ΔΣ modulator followed by a digital filter. This architecture results in very strong attenuation in any common-mode
signals. Input signals are compared to the internal voltage reference. The digital filter receives a high-speed
bitstream from the modulator and outputs a code proportional to the input voltage.
The ADS1018 has two available conversion modes: single-shot mode and continuous conversion mode. In
single-shot mode, the ADC performs one conversion of the input signal upon request and stores the value in an
internal result register. The device then enters a power-down state. This mode is intended to provide significant
power savings in systems that only require periodic conversions or when there are long idle periods between
conversions. In continuous conversion mode, the ADC automatically begins a conversion of the input signal as
soon as the previous conversion is complete. The rate of continuous conversion is equal to the programmed data
rate. Data can be read at any time and always reflect the most recently completed conversion.
Figure 9. ADS1018 Functional Block Diagram
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