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AC/DC 和 DC/DC 轉換器 (整合式 FET)

LM7705

現行

低雜訊負偏壓發生器

立即訂購
產品規格表

現在提供此產品的更新版本

open-in-new 比較替代產品
功能相同，但引腳輸出與所比較的裝置不同
LM27761 現行 具整合式 LDO 的低雜訊穩壓轉換器 Smaller solution size and higher output current up to 200 mA

LM7705

現行
產品規格表 立即訂購

產品詳細資料

Rating Catalog Operating temperature range (°C) -40 to 125 Type Charge pump, Converter Iout (max) (A) 0.026 Vin (min) (V) 3 Vin (max) (V) 5.25 Switching frequency (min) (kHz) 92 Switching frequency (max) (kHz) 92 Features Enable, Regulated, Synchronous Rectification Vout (min) (V) -0.232 Vout (max) (V) -0.232 Iq (typ) (µA) 78
Rating Catalog Operating temperature range (°C) -40 to 125 Type Charge pump, Converter Iout (max) (A) 0.026 Vin (min) (V) 3 Vin (max) (V) 5.25 Switching frequency (min) (kHz) 92 Switching frequency (max) (kHz) 92 Features Enable, Regulated, Synchronous Rectification Vout (min) (V) -0.232 Vout (max) (V) -0.232 Iq (typ) (µA) 78
VSSOP (DGK) 8 14.7 mm² 3 x 4.9
  • Regulated Output Voltage −0.232 V
  • Output Voltage Tolerance 5%
  • Output Voltage Ripple 4 mVPP
  • Supply Voltage 3 V to 5.25 V
  • Conversion Efficiency Up to 98%
  • Quiescent Current 78 µA
  • Shutdown Current 20 nA
  • Turnon Time 500 µs
  • Operating Temperature Range −40°C to 125°C
  • 8-Pin VSSOP Package
  • Regulated Output Voltage −0.232 V
  • Output Voltage Tolerance 5%
  • Output Voltage Ripple 4 mVPP
  • Supply Voltage 3 V to 5.25 V
  • Conversion Efficiency Up to 98%
  • Quiescent Current 78 µA
  • Shutdown Current 20 nA
  • Turnon Time 500 µs
  • Operating Temperature Range −40°C to 125°C
  • 8-Pin VSSOP Package

The LM7705 device is a switched capacitor voltage inverter with a low noise, −0.23 V fixed negative voltage regulator. This device is designed to be used with low voltage amplifiers to enable the amplifiers output to swing to zero volts. The −0.23 V is used to supply the negative supply pin of an amplifier while maintaining less then 5.5 V across the amplifier. Rail-to-Rail output amplifiers cannot output zero volts when operating from a single-supply voltage and can result in error accumulation due to amplifier output saturation voltage being amplified by following gain stages. A small negative supply voltage will prevent the amplifiers output from saturating at zero volts and will help maintain an accurate zero through a signal processing chain. Additionally, when an amplifier is used to drive an input of the ADC, the amplifier can output a zero voltage signal and the full input range of an ADC can be used. The LM7705 device has a shutdown pin to minimize standby power consumption.

The LM7705 device is a switched capacitor voltage inverter with a low noise, −0.23 V fixed negative voltage regulator. This device is designed to be used with low voltage amplifiers to enable the amplifiers output to swing to zero volts. The −0.23 V is used to supply the negative supply pin of an amplifier while maintaining less then 5.5 V across the amplifier. Rail-to-Rail output amplifiers cannot output zero volts when operating from a single-supply voltage and can result in error accumulation due to amplifier output saturation voltage being amplified by following gain stages. A small negative supply voltage will prevent the amplifiers output from saturating at zero volts and will help maintain an accurate zero through a signal processing chain. Additionally, when an amplifier is used to drive an input of the ADC, the amplifier can output a zero voltage signal and the full input range of an ADC can be used. The LM7705 device has a shutdown pin to minimize standby power consumption.
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類型 標題 日期
* Data sheet LM7705 Low-Noise Negative Bias Generator datasheet (Rev. D) PDF | HTML 2018年 5月 8日
Circuit design Charge pump circuit (–0.3V) for negative amplifier supply (Rev. A) PDF | HTML 2024年 8月 21日
Application note Quick Reference Guide To TI Buck Switching DC/DC Application Notes (Rev. B) PDF | HTML 2022年 5月 23日
Technical article How to achieve microvoltage-level precision in thermopile applications PDF | HTML 2021年 12月 9日
Application note Attenuator Amplifier Design to Maximize the Input Voltage of Differential ADCs 2018年 6月 14日
Technical article Unique active mux capability combines buffer and switch into one solution PDF | HTML 2017年 10月 10日
EVM User's guide AN-1883 LM7705 Evaluation Board (Rev. B) 2013年 5月 3日

設計與開發

如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。

開發板

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The ADS8168 evaluation module (EVM) performance demonstration kit (PDK) is a platform for evaluating the performance of the ADS8168 successive-approximation register (SAR) analog-to-digital converter (ADC). The ADS8168EVM-PDK includes the ADS8168EVM board, the precision host interface (PHI) (...)

使用指南: PDF
TI.com 無法提供
開發板

LM7705MMEVAL — 用於 LM7705 的評估板

This evaluation board is designed to demonstrate the functionality of Texas Instruments LM7705 Low Noise Negative Bias Generator. The board has a dual Operational Amplifier that can be connected to ground or biased with the on board LM7705. In the last case a True zero amplifier is demonstrated.

使用指南: PDF
TI.com 無法提供
參考設計

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This reference design for high performance data acquisition (DAQ) systems optimizes power stage in order to reduce power consumption and minimize the effect of EMI from switching regulator by using LMS3635-Q1 buck converter.  This reference designs yields 7.2% efficiency improvement at most (...)
Design guide: PDF
電路圖: PDF
參考設計

TIDA-01054 — 用於消除高效能 DAQ 系統中的 EMI 影響的多軌電源參考設計

The TIDA-01054 reference design helps eliminate the performance degrading effects of EMI on Data Acquisition (DAQ) systems greater than 16 bits with the help of the LM53635 buck converter. The buck converter enables the designer to place power solutions close to the signal path without the (...)
Design guide: PDF
電路圖: PDF
參考設計

TIDA-01042 — 適合 50-A、100-A 及 200-A 應用的模組化電池測試器參考設計

This reference design provides a modular battery test solution allowing users to have the flexibility to test batteries at different current levels with one design. This design leverages the TIDA-01041 reference design by providing two 100-A battery testers that can work independently or be (...)
Design guide: PDF
電路圖: PDF
參考設計

TIDA-01055 — 適用於高效能 DAQ 系統的 ADC 電壓參考緩衝器最佳化參考設計

The TIDA-01055 reference design for high performance DAQ Systems optimizes the ADC reference buffer to improve SNR performance and reduce power consumption with the TI OPA837 high-speed op amp. This device is used in a composite buffer configuration and provides a 22% power improvement over (...)
Design guide: PDF
電路圖: PDF
參考設計

TIDA-01057 — 將真正 10Vpp 差分輸入的訊號動態範圍最大化至 20 位元 ADC 的參考設計

This reference design is designed for high performance data acquisition(DAQ) systems to improve the dynamic range of 20 bit differential input ADCs. Many DAQ systems require the measurement capability at a wide FSR (Full Scale Range) in order to obtain sufficient signal dynamic range. Many earlier (...)
Design guide: PDF
電路圖: PDF
參考設計

TIDA-01051 — 針對自動測試設備最佳化 FPGA 利用率和數據處理能力的參考設計

The TIDA-01051 reference design is used to demonstrate optimized channel density, integration, power consumption, clock distribution and signal chain performance of very high channel count data acquisition (DAQ) systems such as those used in automatic test equipment (ATE). Using serializers, such (...)
Design guide: PDF
電路圖: PDF
參考設計

TIDA-01050 — 適用於 18 位元 SAR 資料轉換器的最佳化類比前端 DAQ 系統參考設計

The TIDA-01050 reference design aims to improve the integration, power consumption, performance, and clocking issues typically associated with automatic test equipment. This design is applicable to any ATE system but most applicable to systems requiring a large number of input channels.
Design guide: PDF
電路圖: PDF
參考設計

TIDA-01052 — 使用負電源輸入改進全幅 THD 的 ADC 驅動器參考設計

The TIDA-01052 reference design aims to highlight system performance increases seen using a negative voltage rail on the analog front end driver amplifiers rather than ground. This concept is relative to all analog front ends, however this design is aimed specifically at automatic test equipment.
Design guide: PDF
電路圖: PDF
參考設計

TIPD129 — 0-1A、單電源供電、低壓側、電流感測解決方案

This TI Verified Design implements a single-supply, low-side current sensing solution that can accurately detect load current from 0-1A.  The corresponding linear output range is from 0V to 4.9V. This design relies on the LM7705 inverting charge pump to bias the negative supply of the OPA320 to (...)
使用指南: PDF
電路圖: PDF
參考設計

TIDA-00187 — 延伸全差分放大器的軌至軌輸出範圍，以納入真正的零伏特

Operational amplifiers (op amps) have been used for decades in signal conditioning circuits and measurement systems. An op amp that has an output spanning from negative to positive supply rail are generally referred to as rail-to-rail output (RRO) op amps. These devices have been used increasingly (...)
Design guide: PDF
電路圖: PDF
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