官方网站-首页

The LTD226X family are high-precision, multi-channel, 40-kSPS, delta-sigma (Δ-Σ)

analog-to-digital converters (ADCs). Features, for example, programmable gain amplifier

(A), precise and low-drift voltage reference, monitors for fault detection, general purpose

input output options are included in this highly-integrated chip making it a single-chip solution

to deal with measurements tasks such as weigh scales, resistance temperature detectors

(RTDs) and thermalcouple sensors. The main path of analog-to-digital conversion consists of an input multiplexer (5 channels for

LTD2260 and 10 channels for LTD2261), a low-noise A, a 24-bit Δ-Σ modulator, a precise and

low-drift voltage reference, and a programmable digital filter. The 1 GΩ high input impedance

of the A minimizes the error induced by sensor loading. The device provide two individual

current source with programmable supplying current, that simplifies the circuit of RTDs

measurements. The conversion is completed by a fourth-order Δ-Σ modulator combined with a flexible digital

filter. The filter supports a simultaneous 50-Hz and 60-Hz rejection mode and single-cycle

settling mode. Associated with internal signal and reference monitors, a temperature sensor

and CRC data verification, the output data is more reliable. The LTD226X family are available in 5 mm × 5 mm QFN packages and specified in temperature

range from -40℃ to 125℃.

• High-precision, 24-bit delta-sigma ADC
  
• Low noise: 30 nVRMS (@20 SPS, gain=128)
  
• Linearity: 2 ppm
  
• 5 single-ended inputs or 3 differential inputs (LTD2260)
  
• 10 single-ended inputs or 5 differential inputs (LTD2261)\
  
• A gain: 1 to 128
  
• Input voltage range: ±7 mV to ±5 V
  
• Data rate: 2.5 SPS to 40 kSPS
  
• Low drift 2.5 V reference: 2 ppm/℃
  
• Simultaneous 50-Hz and 60-Hz rejection mode
  
• Single-cycle settling mode
  
• A voltages and reference monitors
  
• 5 V or ±2.5 V supply
  
• Integrated temperature sensor
  
• Cyclic redundancy check
  
• Two individual current source
  
• Sensor burn-out detection
  
• 4 GPIOs available
  
• AC excitation for bridge sensors
  
• SPI compatible
  

• Temperature and pressure measurement
  
• Analog input modules in PLC and DCS
  
• Weigh scales and strain-gauge digitizers
  
• Scientific and lab instruments