Low Noise Negative Bias Generator
Product details
Parameters
Package | Pins | Size
Features
- 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
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Description
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.
Technical documentation
Type | Title | Date | |
---|---|---|---|
* | Datasheet | LM7705 Low-Noise Negative Bias Generator datasheet (Rev. D) | May 08, 2018 |
Application note | Charge pump circuit (–0.3V) for negative amplifier supply | Jun. 16, 2019 | |
Application note | Attenuator Amplifier Design to Maximize the Input Voltage of Differential ADCs | Jun. 14, 2018 | |
Application note | A Topical Index of TI Low Power Buck DC/DC Application Notes | Jan. 17, 2018 | |
Technical articles | Unique active mux capability combines buffer and switch into one solution | Oct. 10, 2017 | |
User guide | ADS7056EVM-PDK Quick Start Guide | Mar. 09, 2017 | |
Technical articles | Where did the op amp ground pin go? | Mar. 18, 2016 | |
Technical articles | Painting a picture for powering high-performance FPGAs | Sep. 05, 2013 | |
Technical articles | Analog Applications Spotlight: Mark Pieper | Jun. 06, 2013 | |
User guide | AN-1883 LM7705 Evaluation Board (Rev. B) | May 03, 2013 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
Features
- 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 (...)
Description
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 (...)
Features
- Includes hardware and software required for diagnostic testing, as well as accurate performance of the ADS8168 ADC
- No external power supply required
- Ships with PHI controller that provides a convenient interface to ADS8168EVM over USB 2.0 (or higher) for power delivery, as well as digital input/output
- (...)
Description
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.
Design tools & simulation
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
Design files
-
download TIDA-01042 BOM.pdf (241KB) -
download TIDA-01042 Assembly Drawing.pdf (528KB) -
download TIDA-01042 PCB.pdf (7810KB) -
download TIDA-01042 CAD Files.zip (5259KB) -
download TIDA-01042 Gerber.zip (1270KB)
Design files
-
download TIDA-01054 Assembly Drawing.pdf (858KB) -
download TIDA-01054 PCB.pdf (3668KB) -
download TIDA-01054 Gerber.zip (1236KB) -
download TIDA-01054 BOM (Rev. A).pdf (79KB) -
download TIDA-01054 Altium (Rev. A).zip (57322KB)
Design files
-
download TIDA-01055 BOM.pdf (231KB) -
download TIDA-01055 Assembly Drawing.pdf (872KB) -
download TIDA-01055 PCB.pdf (3715KB) -
download TIDA-01055 Altium.zip (17037KB) -
download TIDA-01055 Gerber.zip (1227KB)
Design files
-
download TIDA-01057 BOM.pdf (123KB) -
download TIDA-01057 Assembly Drawing.pdf (983KB) -
download TIDA-01057 PCB.pdf (4279KB) -
download TIDA-01057 Altium.zip (30897KB) -
download TIDA-01057 Gerber.zip (2100KB)
Design files
-
download TIDA-01056 BOM.pdf (124KB) -
download TIDA-01056 Assembly Drawing.pdf (810KB) -
download TIDA-01056 PCB.pdf (3442KB) -
download TIDA-01056 CAD Files.zip (2609KB) -
download TIDA-01056 Gerber.zip (1603KB)
Design files
-
download TIDA-01051 BOM.pdf (107KB) -
download TIDA-01051 Assembly Drawing.pdf (2002KB) -
download TIDA-01051 PCB.pdf (8638KB) -
download TIDA-01051 CAD Files.zip (15688KB) -
download TIDA-01051 Gerber.zip (1735KB)
Design files
-
download TIDA-01050 BOM.pdf (247KB) -
download TIDA-01050 Assembly Drawing.pdf (3862KB) -
download TIDA-01050 PCB.pdf (7143KB) -
download TIDA-01050 CAD Files.zip (2442KB) -
download TIDA-01050 Gerber.zip (1180KB)
Design files
-
download TIDA-01052 BOM.pdf (247KB) -
download TIDA-01052 Assembly Drawing.pdf (3862KB) -
download TIDA-01052 PCB.pdf (7170KB) -
download TIDA-01052 CAD Files.zip (11142KB) -
download TIDA-01052 Gerber.zip (1180KB)
Design files
-
download TIPD129 BOM.pdf (75KB) -
download TIPD129 Gerber.zip (266KB)
Design files
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download TIDA-00187 BOM.pdf (61KB) -
download TIDA-00187 Gerber.zip (182KB)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
VSSOP (DGK) | 8 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
Support & training
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