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3.3 V
Thermocouple
AIN0
AIN1
AIN2
AIN3
Isothermal
Block
AIN
P
AIN
N
Low-Drift
Oscillator
Reference
MUX
Precision
Temperature
Sensor
SCLK
CS
AVDD
AVSS
DOUT/DRDY
DIN
TI Device
DRDY
DGND
REFP0 REFN0
Internal
Reference
CLK
50 A to
1.5 mA
MUX
DVDD
PGA
16-Bit
ûADC
Digital Filter
and
SPI
Interface
3.3 V
0.1 PF
3.3 V
0.1 PF
Copyright © 2017, Texas Instruments Incorporated
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Design
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
ADS1120
SBAS535C –AUGUST 2013–REVISED FEBRUARY 2017
ADS1120 4-Channel, 2-kSPS, Low-Power, 16-Bit ADC with Integrated PGA and Reference
1
1 Features
1
• Low Current Consumption:
As Low as 120 μA (typ) in Duty-Cycle Mode
• Wide Supply Range: 2.3 V to 5.5 V
• Programmable Gain: 1 V/V to 128 V/V
• Programmable Data Rates: Up to 2 kSPS
• 16-Bit Noise-Free Resolution at 20 SPS
• Simultaneous 50-Hz and 60-Hz Rejection at
20 SPS with Single-Cycle Settling Digital Filter
• Two Differential or Four Single-Ended Inputs
• Dual-Matched Programmable Current Sources:
50 μA to 1.5 mA
• Internal 2.048-V Reference: 5 ppm/°C (typ) Drift
• Internal 2% Accurate Oscillator
• Internal Temperature Sensor:
0.5°C (typ) Accuracy
• SPI-Compatible Interface (Mode 1)
• Package: 3.5-mm × 3.5-mm × 0.9-mm VQFN
2 Applications
• Temperature Sensor Measurements:
– Thermistors
– Thermocouples
– Resistance Temperature Detectors (RTDs):
2-, 3-, or 4-Wire Types
• Resistive Bridge Sensor Measurements:
– Pressure Sensors
– Strain Gauges
– Weigh Scales
• Portable Instrumentation
• Factory Automation and Process Controls
3 Description
The ADS1120 is a precision, 16-bit, analog-to-digital
converter (ADC) that offers many integrated features
to reduce system cost and component count in
applications measuring small sensor signals. The
device features two differential or four single-ended
inputs through a flexible input multiplexer (MUX), a
low-noise, programmable gain amplifier (PGA), two
programmable excitation current sources, a voltage
reference, an oscillator, a low-side switch, and a
precision temperature sensor.
The device can perform conversions at data rates up
to 2000 samples-per-second (SPS) with single-cycle
settling. At 20 SPS, the digital filter offers
simultaneous 50-Hz and 60-Hz rejection for noisy
industrial applications. The internal PGA offers gains
up to 128 V/V. This PGA makes the ADS1120 ideally-
suited for applications measuring small sensor
signals, such as resistance temperature detectors
(RTDs), thermocouples, thermistors, and bridge
sensors. The device supports measurements of
pseudo- or fully-differential signals when using the
PGA. Alternatively, the device can be configured to
bypass the internal PGA while still providing high
input impedance and gains up to 4 V/V, allowing for
single-ended measurements.
Power consumption is as low as 120 µA when
operating in duty-cycle mode with the PGA disabled.
The ADS1120 is offered in a leadless VQFN-16 or a
TSSOP-16 package and is specified over a
temperature range of –40°C to +125°C.
Device Information
(1)
PART NUMBER PACKAGE BODY SIZE (NOM)
ADS1120
VQFN (16) 3.50 mm × 3.50 mm
TSSOP (16) 5.00 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
K-Type Thermocouple Measurement
Verzeichnis
- ・ Konfiguration des Pinbelegungsdiagramms on Seite 4
- ・ Abmessungen des Paketumrisses on Seite 64 Seite 66 Seite 67
- ・ Markierungsinformationen on Seite 64
- ・ Blockdiagramm on Seite 19
- ・ Typisches Anwendungsschaltbild on Seite 49
- ・ Technische Daten on Seite 5 Seite 20
- ・ Anwendungsbereich on Seite 1 Seite 33 Seite 49
- ・ Elektrische Spezifikation on Seite 7 Seite 8 Seite 25 Seite 28
- ・ Teilenummernliste on Seite 20
