REF6125 8ppm/C High-Precision Voltage Reference with Integrated High-Bandwidth Buffer | TI.com

REF6125 (ACTIVE) 8ppm/C High-Precision Voltage Reference with Integrated High-Bandwidth Buffer

 

Description

The REF6000 family of voltage references have an integrated low output impedance buffer that enable the user to directly drive the REF pin of precision data converters, while preserving linearity, distortion, and noise performance. Most precision SAR and Delta-Sigma ADCs, switch binary-weighted capacitors onto the REF pin during the conversion process. In order to support this dynamic load the output of the voltage reference must be buffered with a low-output impedance (high-bandwidth) buffer. The REF6000 family devices are well suited, but not limited, to drive the REF pin of the ADS88xx family of SAR ADCs, and ADS127xx family of delta-sigma ADCs, as well as other digital-to-analog converters (DACs).

The REF6000 family of voltage references are able to maintain an output voltage within 1LSB (18-bit) with minimal droop, even during the first conversion while driving the REF pin of the ADS8881. This feature is useful in burst-mode, event-triggered, equivalent-time sampling, and variable-sampling-rate data-acquisition systems. The REF61xx variants of REF6000 family specify a maximum temperature drift of just 8 ppm/°C and initial accuracy of 0.05% for both the voltage reference and the low output impedance buffer combined. For various temperature drift options in REF6000 family, see the Device Comparison Table.

Features

  • Excellent Temperature Drift Performance
    • 8 ppm/°C (max) from –40°C to +125°C
  • Extremely Low Noise
    • Total Noise: 5 µVRMS With 47-µF Capacitor
    • 1/f Noise (0.1 Hz to 10 Hz): 3 µVPP/V
  • Integrated ADC Drive Buffer
    • Low Output Impedance: < 50 mΩ (0-200 kHz)
    • First Sample Precise to 18 Bits With ADS8881
    • Enables Burst-Mode DAQ Systems
  • Low Supply Current: 820 µA
  • Low Shutdown Current: 1 µA
  • High Initial Accuracy: ±0.05%
  • Very-Low Noise and Distortion
    • SNR: 100.5 dB, THD: –125 dB (ADS8881)
    • SNR: 106 dB, THD: –120 dB (ADS127L01)
  • Output Current Drive: ±4 mA
  • Programmable Short-Circuit Current
  • Verified to Drive REF Pin of ADS88xx family of SAR ADCs and ADS127xx family of Wideband ΔΣ ADCs

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Parametrics

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Part number Order VO (V) Initial accuracy (Max) (%) Temp coeff (Max) (ppm/ degree C) Rating Operating temperature range (C) Iout/Iz (Max) (mA) Iq (Typ) (uA) Shutdown current (Typ) (uA) Iq (Max) (uA) Features Package Group Vin (Min) (V) Vin (Max) (V)
REF6125 Order now 2.5     0.05     8     Catalog     -40 to 125     4     820     1     900     Integrated Low Output Impedance Buffer     VSSOP | 8     3     5.5    
REF5025 Order now 2.5     0.05     3     Catalog     -40 to 125     10     800       1000     TRIM/NR pin     SOIC | 8
VSSOP | 8    
2.7     18    
REF6025 Order now 2.5     0.05     5     Catalog     -40 to 125     4     820     1     900     Integrated Low Output Impedance Buffer     VSSOP | 8     3     5.5    
REF6030 Order now 3     0.05     5     Catalog     -40 to 125     4     820     1     900     Integrated Low Output Impedance Buffer     VSSOP | 8     3.25     5.5    
REF6033 Order now 3.3     0.05     5     Catalog     -40 to 125     4     820     1     900     Integrated Low Output Impedance Buffer     VSSOP | 8     3.55     5.5    
REF6041 Order now 4.096     0.05     5     Catalog     -40 to 125     4     820     1     900     Integrated Low Output Impedance Buffer     VSSOP | 8     4.35     5.5    
REF6045 Order now 4.5     0.05     5     Catalog     -40 to 125     3.5     830     1     950     Integrated Low Output Impedance Buffer