LTC2428 - 4-/8-Channel 20-Bit µPower No Latency Delta-Sigma ADC


  • Pin Compatible 4-/8-Channel 20-Bit ADCs
  • 8ppm INL, No Missing Codes at 20 Bits
  • 4ppm Full-Scale Error and 0.5ppm Offset
  • 1.2ppm Noise
  • Digital Filter Settles in a Single Cycle. Each
    Conversion is Accurate, Even After Changing
  • Fast Mode: 16-Bit Noise, 12-Bit TUE at 100sps
  • Internal Oscillator—No External Components
  • 110dB Min, 50Hz/60Hz Notch Filter
  • Reference Input Voltage: 0.1V to VCC
  • Live Zero—Extended Input Range Accommodates
    12.5% Overrange and Underrange
  • Single Supply 2.7V to 5.5V Operation
  • Low Supply Current (200µA) and Auto Shutdown
  • Can Be Interchanged with 24-Bit LTC2404/LTC2408
    if ZSSET Pin is Grounded

Typical Application

LTC2428 Typical Application
LTC2428 Typical Application


The LTC2424/LTC2428 are 4-/8-channel 2.7V to 5.5V micropower 20-bit A/D converters with an integrated oscillator, 8ppm INL and 1.2ppm RMS noise. They use delta-sigma technology and provide single cycle digital filter settling time (no latency delay) for multiplexed applications. The first conversion after the channel is changed is always valid. Through a single pin the LTC2424/LTC2428 can be configured for better than 110dB rejection at 50Hz or 60Hz ±2%, or can be driven by an external oscillator for a user defined rejection frequency in the range 1Hz to 800Hz. The internal oscillator requires no external frequency setting components.

The converters accept any external reference voltage from 0.1V to VCC. With their extended input conversion range of -12.5% VREF to 112.5% VREF (VREF = FSSET - ZSSET) the LTC2424/LTC2428 smoothly resolve the offset and overrange problems of preceding sensors or signal conditioning circuits.

The LTC2424/LTC2428 communicate through a flexible 4-wire digital interface which is compatible with SPI and MICROPOWER protocols.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC2428CG#PBF SSOP-28 G C 05-08-1640 (G28) Yes
LTC2428CG#TRPBF SSOP-28 G C 05-08-1640 (G28) Yes
LTC2428IG#PBF SSOP-28 G I 05-08-1640 (G28) Yes
LTC2428IG#TRPBF SSOP-28 G I 05-08-1640 (G28) Yes

LTC2428 Package Drawing
LTC2428 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTC2428CG#PBF SSOP-28 C $6.20 $5.25 Yes
LTC2428CG#TRPBF SSOP-28 C $5.35 Yes
LTC2428IG#PBF SSOP-28 I $6.80 $5.75 Yes
LTC2428IG#TRPBF SSOP-28 I $5.85 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

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Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards


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