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Parameters

VO (V) 3.3, 1.65 Initial accuracy (Max) (%) 0.1 Temp coeff (Max) (ppm/ degree C) 25 Rating Catalog Vin (Min) (V) 3.32 Vin (Max) (V) 5.5 Iq (Typ) (uA) 360 Features Multiple outputs, Enable pin Iout/Iz (Max) (mA) 20 Operating temperature range (C) -40 to 125 Shutdown current (Typ) (uA) 3.3 open-in-new Find other Series voltage references

Package | Pins | Size

SOT-23-THN (DDC) 5 8 mm² 2.9 x 2.8 open-in-new Find other Series voltage references

Features

  • Two Outputs, VREF and VREF / 2, for Convenient Use in Single-Supply Systems
  • Excellent Temperature Drift Performance:
    • 25 ppm/°C (max) from –40°C to 125°C
  • High Initial Accuracy: ±0.1% (max)
  • VREF and VBIAS Tracking over Temperature:
    • 6 ppm/°C (max) from –40°C to 85°C
    • 7 ppm/°C (max) from –40°C to 125°C
  • Microsize Package: SOT23-5
  • Low Dropout Voltage: 10 mV
  • High Output Current: ±20 mA
  • Low Quiescent Current: 360 µA
  • Line Regulation: 3 ppm/V
  • Load Regulation: 8 ppm/mA
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Description

Applications with only a positive supply voltage often require an additional stable voltage in the middle of the analog-to-digital converter (ADC) input range to bias input bipolar signals. The REF19xx provides a reference voltage (VREF) for the ADC and a second highly-accurate voltage (VBIAS) that can be used to bias the input bipolar signals.

The REF19xx offers excellent temperature drift (25 ppm/°C, max) and initial accuracy (0.1%) on both the VREF and VBIAS outputs while operating at a quiescent current less than 430 µA. In addition, the VREF and VBIAS outputs track each other with a precision of 6 ppm/°C (max) across the temperature range of –40°C to 85°C. All these features increase the precision of the signal chain and decrease board space, while reducing the cost of the system as compared to a discrete solution. Extremely low dropout voltage of only 10 mV allows operation from very low input voltages, which can be very useful in battery-operated systems.

Both the VREF and VBIAS voltages have the same excellent specifications and can sink and source current equally well. Very good long-term stability and low noise levels make these devices ideally-suited for high-precision industrial applications.

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Exact equivalent in functionality and parametrics to the compared device:
REF2033 ACTIVE 3.3-V Vref, low-drift, low-power, dual-output Vref & Vref/2 voltage reference Offers lower temperature drift and initial accuracy on both VREF and VBIAS.

Technical documentation

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Type Title Date
* Datasheet REF19xx Low-Drift, Low-Power, Dual-Output, VREF and VREF / 2 Voltage References datasheet (Rev. A) Jan. 03, 2017
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun. 28, 2019
User guide ADS7056EVM-PDK Quick Start Guide Mar. 09, 2017

Design & development

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Hardware development

EVALUATION BOARD Download
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The ADS7056 evaluation module (EVM) performance demonstration kit (PDK) is a platform for evaluating the performance of the ADS7056 successive approximation register (SAR) analog-to-digital converter (ADC), which is a single-ended input, 14-bit, 2.5-MSPS device. The ADS7056EVM-PDK (...)
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  • Hardware and software required for diagnostic testing, as well as accurate performance evaluation of ADS7056 SAR ADC
  • USB powered; no external power supply required
  • PHI controller provides convenient communication interface to ADS7056 ADC over a USB 2.0 (or higher) for power delivery, as well as (...)

Design tools & simulation

SIMULATION MODEL Download
SBOM915.ZIP (25 KB) - Spice Model
SIMULATION MODEL Download
SBOM916.ZIP (14 KB) - TINA-TI Reference Design
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

REFERENCE DESIGNS Download
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CAD/CAE symbols

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SOT-23-THIN (DDC) 5 View options

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