LHA7220
The LHA7220 is a precision, 24-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, a precision temperature sensor and an input bias voltage generator.
The device can perform conversions at data rates up to 2kSPS with single-cycle settling and 4kSPS in continuous conversion. 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 LHA7220 ideally suited for applications measuring small sensor signals, such as resistance temperature detectors (RTDs), thermocouples, thermistors, and resistive bridge sensors. The device supports measurements of pseudo- or fully-differential signals when using the PGA. The PGA allows true rail-to-rail input voltage which is very friendly to sensors application.
Power consumption is as low as 128 μA when operating in duty-cycle mode with the PGA enabled. The LHA7220 is offered in a leadless QFN-16 or a TSSOP-16 package and is specified over a temperature range of −40°C to +125°C.
Product Features
- Low Current Consumption: As low as 128 μA in Duty-Cycle Mode with PGA on
- Wide Supply Range: 2.5 V to 5.5 V
- Programmable Gain: 1 V/V to 128 V/V
- Programmable Data Rates: Up to 4 kSPS
- Up to 22-Bits Effective Resolution
- Simultaneous 50-Hz and 60-Hz Rejection at 20 SPS with Single-Cycle Settling Digital Filter
- Two Differential or Four Single-Ended Inputs
- Support true rail-to-rail input
- Dual Matched Programmable Current Sources: 10 μA to 1.5 mA
- Internal 2.048-V Reference: 4 ppm/°C (typ) Drift
- Internal 2% Accurate Oscillator
- Internal Temperature Sensor: 0.5°C (typ) Accuracy
- Input VBIAS generator
- SPI-Compatible Interface (Mode 1)
- Package: TSSOP16 and QFN16
Application Scenario
• 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 Control
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