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Application Notes

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  A Standards Lab Grade 20-Bit DAC with 0.1ppm/В° Drift: The Dedicated Art of Digitizing One Part Per Million &mdash AN86
  PDF, 540 Kb, File published: Jan 1, 2001
  This publication details a true 1ppm D-to-A converter. Total DC error of this processor corrected DAC remains within 1ppm from 18-32°C, including reference drift. DAC error exclusive of reference drift is substantially better. Construction details and performance verification techniques are included, along with a complete software listing.
  Extract from the document

  Application Note 86
  January 2001
  A Standards Lab Grade 20-Bit DAC with 0.1ppm/В°C Drift
  The Dedicated Art of Digitizing One Part Per Million
  Jim Williams
  J. Brubaker
  P. Copley
  J. Guerrero
  F. Oprescu INTRODUCTION
  Significant progress in high precision, instrumentation
  grade D-to-A conversion has recently occurred. Ten years
  ago 12-bit D-to-A converters (DACs) were considered
  premium devices. Today, 16-bit DACs are available and
  increasingly common in system design. These are true
  precision devices with less than 1LSB linearity error and
  1ppm/В°C drift.1 Nonetheless, there are DAC applications
  that require even higher performance. Automatic test
  equipment, instruments, calibration apparatus, laser trimmers, medical electronics and other applications often
  require DAC accuracy beyond 16 bits. 18-bit DACs have
  been produced in circuit assembly form, although they are
  expensive and require frequent calibration. 20 and even
  23+ (0.1ppm!) bit DACs are represented by manually
  switched Kelvin-Varley dividers. These devices, although …

Design Notes

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  Testing Linearity of the LTC2400 24-Bit No Latency Delta SigmaTM A/D Converter Help from the Nineteenth Century &mdash Design Solutions 11
  PDF, 51 Kb, File published: Nov 1, 1999
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  Design Solutions 11
  November 1999
  Testing Linearity of the LTC2400 24-Bit No Latency ∆ΣTM
  A/D Converter
  Help from the Nineteenth Century
  by Jim Williams
  Introduction
  Verifying the linearity of the LTC2400 analog to digital
  converter requires special considerations. Typical
  nonlinearity is only 2ppm (0.0002%). Bench testing this
  necessitates some form of voltage source that produces
  equal amplitude output steps for incremental digital inputs. Additionally, for measurement confidence, it is desirable that the source be substantially more linear than
  the 2ppm requirement. This is, of course, a stringent
  demand and painfully close to the state of the art. follower is required to unload the KVD without introducing
  significant loading error. Now, our KVD looks like Figure 3.
  10k 2k 400Ω 80Ω INPUT The most linear “D to A” converter is also one of the oldest:
  Lord Kelvin’s Kelvin-Varley divider (KVD), in its most
  developed form, is linear to 0.1ppm. This manually switched
  device features ten million individual dial settings arranged in seven decades. It may be thought of as a
  3-terminal potentiometer with fixed “end-to-end” resistance and a 7-decade switched wiper position (Figure 1). R = 100k 80Ω
  OUT
  80Ω SEVEN-DECADE SWITCHED
  WIPER POSITION PERMITS …

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  High Accuracy, Differential to Single-Ended Conversion for Wide Range Bipolar Input Signals Bipolar Differential to Single-Ended Converter Drives the LTC2400's Input Rail-to-Rail &mdash Design Solutions 4
  PDF, 37 Kb, File published: Apr 1, 1999
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  Design Solutions 4
  April 1999
  High Accuracy, Differential to Single-Ended Conversion for
  Wide Range Bipolar Input Signals
  Bipolar Differential to Single-Ended Converter Drives the LTC2400’s Input Rail-to-Rail
  by Kevin R. Hoskins and Derek V. Redmayne
  SPECIFICATIONS
  VCC = VREF = LT 1236-5; VFS = В±2.45V;
  RSOURCE = 175Ω (Balanced)
  В® PARAMETER
  Input Voltage Range
  Zero Error CIRCUIT
  TOTAL
  (MEASURED) LTC2400 (UNITS)
  В±2.45
  22 V
  1.5 ВµV Input Current See Text Nonlinearity В±2.5 4 ppm Input-Referred Noise
  (without averaging) 6.5 1.5 ВµVRMS 1 ВµVRMS Resolution (with averaged readings) 22.2 Bits Overall Accuracy (uncalibrated) 17.1 Bits Input-Referred Noise
  (averaged 64 readings) Supply Voltage 5 5 V Supply Current 2.1 0.2 mA CMRR 118 dB 0 to 5 V Common Mode Range OPERATION
  The circuit in Figure 1 is ideal for wide dynamic range
  differential signals in applications that have a 5V supply.
  The circuit uses one-half of an LTCВ®1043 to perform a
  differential to single-ended conversion over an input common mode range that includes the power supplies. This …

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  Low Level, High Accuracy, Bipolar Input Differential to Single-Ended Signal Conversion for 24-Bit A/D Single Supply Differential to Single-Ended Conversion Circuit Amplifies Low Level Bipolar Signals and Maintains the LTC2400's High &mdash Design Solutions 5
  PDF, 38 Kb, File published: Apr 1, 1999
  Extract from the document

  Design Solutions 5
  April 1999
  Low Level, High Accuracy, Bipolar Input Differential to
  Single-Ended Signal Conversion for 24-Bit A/D
  Single Supply Differential to Single-Ended Conversion Circuit Amplifies Low Level
  Bipolar Signals and Maintains the LTC2400’s High Accuracy
  by Kevin R. Hoskins and Derek V. Redmayne
  SPECIFICATIONS
  VCC = VREF = LTВ®1236-5; VFS = В±125mV;
  RSOURCE = 175Ω (Balanced)
  PARAMETER
  Input Voltage Range CIRCUIT
  LTC2400 TOTAL
  (MEASURED)
  ONLY (UNITS)
  В±125 mV
  1.5 ВµV В±2.5 4 ppm 1* 1.5 ВµV Zero Error 25 Input Current See Text Nonlinearity
  Input-Referred Noise
  (without averaging)
  Input-Referred Noise
  (averaged 64 readings) 0.12* ВµV Resolution (with averaged readings) 21.0 Bits Overall Accuracy (uncalibrated)** 17.0 Bits Supply Voltage 5 5 V Supply Current 1.2 0.2 mA CMRR 118 dB 0 to 5 V Common Mode Range * Input-referred noise with a gain of 20.
  ** Does not include gain setting resistors. OPERATION
  The circuit in Figure 1 is ideal for wide dynamic range …

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Manufacturer's Classification

• Signal Conditioning > Amplifiers > Operational Amplifiers (Op Amps) > Precision Amplifiers (Vos | Zero-Drift Amplifiers | Low Bias Current Amplifiers (Ib < 100pA) | High Voltage Amplifiers (>12V) | Rail-to-Rail Amplifiers

Other Names:

LTC1152CS8PBF, LTC1152CS8 PBF