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Texas Instruments ADS7834E/2K5G4
- Part No.:
- ADS7834E/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7834E/2K5G4.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,009
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Product details
Overview
ADS7834E/2K5G4 from Texas Instruments is a 12-bit successive approximation register (SAR) analog-to-digital converter with integrated sample/hold, internal 2.5V reference, and synchronous serial interface. It delivers 500kHz throughput at 11mW typical power dissipation, supports differential input (±0.2V on –IN), and operates over –40°C to +85°C in MSOP-8 package - ideal for portable spectrum analyzers and battery-powered data loggers.
For engineers reviewing the ADS7834E/2K5G4 datasheet, ADS7834E/2K5G4 pinout, ADS7834E/2K5G4 application, or ADS7834E/2K5G4 equivalent, key selection considerations include guaranteed 12-bit no-missing-codes performance, 2.5V internal reference with ±20ppm/°C drift, differential input range of 0V to VREF, serial LSB/MSB-first flexibility, and power-down mode reducing consumption to 2.5mW.
Technical Context
The ADS7834E/2K5G4 implements a capacitive redistribution SAR architecture fabricated in 0.6µm CMOS, enabling inherent sample/hold functionality without external components. Its conversion timing is asynchronous to CLK - initiated by CONV falling edge - allowing flexible interfacing with DSPs or microcontrollers via SPI-like protocols.
It features dual-reference operation: internal 2.5V bandgap reference (2.475V–2.525V, ±20ppm/°C) or externally overdriven reference (2.0V–2.55V) through a 10kΩ ±30% series resistor. The VREF pin requires 0.1µF ceramic + 2.2µF tantalum bypassing to suppress SAR-induced glitches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits with guaranteed no missing codes across –40°C to +85°C - ensures monotonicity in closed-loop control and precision monitoring. |
| Throughput Rate | 500 kHz maximum - enables real-time acquisition of signals up to 350 kHz usable bandwidth (SNR > 68 dB). |
| Power Dissipation | 11 mW at 500 kHz; drops to 2.5 mW in power-down mode - critical for extended battery life in portable instrumentation. |
| Input Range | 0 V to VREF (2.5 V nominal); differential input with –IN limited to ±0.2 V - supports remote ground sensing and common-mode rejection. |
| Reference Accuracy | 2.475 V to 2.525 V (±1%); 20 ppm/°C drift - contributes ≤1 LSB full-scale error over temperature without external calibration. |
| Integral Linearity | ±2 LSB max (ADS7834E grade) - defines end-point accuracy for DC-critical applications like sensor digitization. |
| Aperture Jitter | 30 ps - limits SNR degradation at high input frequencies; enables <72 dB SNR at 10 kHz. |
Pinout & Package
ADS7834E/2K5G4 is packaged in an 8-pin MSOP (DGK) with 0.65 mm pitch, footprint-compatible with SOIC-8 but 30% smaller area. Thermal pad is not present; standard reflow profile applies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VREF | Reference output/input | Provides buffered 2.5V internal reference or accepts 2.0–2.55V external reference; requires 0.1µF + 2.2µF bypassing to GND. |
| 2 - +IN | Differential analog input (+) | Accepts 0V to VREF signal; must stay within GND–0.2V to VREF+0.2V to maintain linearity. |
| 3 - –IN | Differential analog input (–) | Limited to ±0.2V range; used for remote ground sensing - not for large common-mode rejection. |
| 4 - GND | Analog/digital ground | Single ground plane required; decoupling caps must connect here to minimize noise coupling into SAR core. |
| 5 - CONV | Convert control input | Asynchronous command: falling edge initiates hold/conversion; LOW during 13th clock enters power-down or LSB-first mode. |
| 6 - DATA | Serial data output | 3-state CMOS output; transmits 12-bit straight-binary result MSB-first (or LSB-first if CONV toggled); tri-states when CONV LOW. |
| 7 - CLK | Serial clock input | Accepts 200 kHz–8 MHz clock; duty cycle insensitive; minimum 50 ns HIGH/LOW; controls conversion speed and data timing. |
| 8 - +VCC | Power supply | +4.75V to +5.25V single supply; requires 0.1µF ceramic + 10µF tantalum decoupling to GND. |
Key Features
| Feature | Design Value |
|---|---|
| 12-bit no missing codes | Guaranteed over full temperature range - eliminates code ambiguity in safety-critical or feedback control loops. |
| Configurable serial output | Supports both MSB-first (default) and LSB-first transmission via CONV timing - simplifies alignment with legacy MCU firmware. |
| Low-power power-down mode | Reduces supply current to 0.5 mA (2.5 mW) with full wake-up readiness - enables burst-mode acquisition in energy-constrained systems. |
| Differential input architecture | Enables remote ground sensing via –IN pin - reduces measurement error from PCB trace IR drop in distributed sensor nodes. |
| Internal 2.5V reference | Eliminates need for external reference IC; ±1% initial accuracy and 20 ppm/°C drift - sufficient for 12-bit accuracy without trimming. |
Applications
| Portable Spectrum Analyzer Front-End | Battery-Powered Multi-Channel Data Logger |
|---|---|
Use Scenario: Digitizing RF downconverted IF signals (up to 350 kHz) in handheld field test equipment with tight size and thermal constraints. IC Role / Device Role / Timing Role: High-speed SAR ADC capturing baseband waveforms with minimal latency; serial interface enables optical isolation between RF section and processor. Use Value: 500 kHz throughput and 72 dB SNR preserve spectral resolution; 11 mW power enables >8-hour operation on Li-ion cell. |
Use Scenario: Simultaneous sampling of 4–8 industrial sensors (thermocouples, strain gauges) in remote environmental monitoring nodes. IC Role / Device Role / Timing Role: Precision digitizer with differential inputs rejecting ground loop noise; power-down mode synchronizes with wireless transmit intervals. Use Value: Guaranteed no missing codes ensures linear sensor response mapping; internal reference reduces BOM count and layout area. |
| DSP-Based Digital Signal Processing System | Wireless Communication Transceiver Monitoring |
Use Scenario: Real-time analog monitoring of power amplifier bias voltage and temperature in cellular base station remote radio units. IC Role / Device Role / Timing Role: High-reliability ADC interfaced directly to TI C54x DSP's buffered serial port (BFSX/BCLKX/BDR pins). Use Value: Asynchronous CONV/CLK timing tolerates DSP clock jitter; 30 ps aperture jitter maintains EVM integrity during calibration. |
Use Scenario: In-band signal quality monitoring (RSSI, distortion) in Bluetooth/Wi-Fi client devices during packet transmission. IC Role / Device Role / Timing Role: Low-latency ADC triggered by MAC-layer events; serial interface shares GPIO lines with host MCU to conserve pins. Use Value: Short-cycle conversion mode allows rapid threshold detection before full 12-bit read - cuts average power by >60% in duty-cycled operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7832U | 10-bit resolution, same MSOP-8 package, 500 kHz throughput, 7 mW power - lacks internal reference and differential input. | Suitable only for lower-accuracy monitoring where 10-bit quantization suffices; requires external reference and single-ended design. | Select ADS7832U only when cost sensitivity outweighs resolution and integration needs - not a drop-in replacement. |
| ADS8320EB | 16-bit SAR, 100 kHz max throughput, 2.5 mW active power, SPI-compatible interface - higher resolution but slower and more expensive. | Used in precision instrumentation (e.g., portable DMMs); incompatible timing and pinout - requires PCB redesign. | Choose ADS8320EB when 16-bit DC accuracy is mandatory and throughput ≥100 kHz is acceptable - not interchangeable. |
Compared with ADS7834E/2K5G4, ADS7832U sacrifices 2 bits and reference integration for lower cost and power, while ADS8320EB trades speed and price for 4 extra bits - neither matches the unique balance of 12-bit no-missing-codes, integrated reference, differential input, and 500 kHz throughput in MSOP-8.
Availability
ADS7834E/2K5G4 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data acquisition, and wireless transceiver monitoring requiring stable component supply and long-term manufacturability.
Supply support for ADS7834E/2K5G4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of leadership in precision data converters.
The ADS7834E/2K5G4 belongs to TI's precision SAR ADC product line, designed specifically for portable, low-power, high-throughput applications where integration, size, and guaranteed monotonicity are critical - not general-purpose conversion.
FAQ
What is the guaranteed operating temperature range for the ADS7834E/2K5G4?
The ADS7834E/2K5G4 is specified and tested over –40°C to +85°C ambient temperature. All key parameters - including integral linearity (±2 LSB), no missing codes, and 500 kHz throughput - are ensured across this full industrial range. The device uses a qualified MSOP-8 package with lead finish suitable for extended thermal cycling.
Does the ADS7834E/2K5G4 require an external reference, or can it operate with its internal reference?
The ADS7834E/2K5G4 can operate fully with its internal 2.5V bandgap reference - no external reference is required. The internal reference provides 2.475V–2.525V output with ±20ppm/°C drift and supports 0V to 2.5V input range. External reference (2.0V–2.55V) is optional and connected via the VREF pin, overriding the internal source through a 10kΩ series resistor.
How does the power-down mode function in the ADS7834E/2K5G4, and what is its recovery time?
In the ADS7834E/2K5G4, power-down is entered when CONV remains LOW during conversion and stays LOW at the start of the 13th clock cycle. Power dissipation drops to 2.5 mW. Recovery occurs on the rising edge of CONV, requiring ≥350 ns acquisition time (tACQ) before valid conversion - no additional delay or initialization sequence is needed.
Can the ADS7834E/2K5G4 interface directly with an SPI bus, and what pins map to standard SPI signals?
Yes, the ADS7834E/2K5G4 supports SPI-like operation: CONV maps to chip select (CS), CLK to SCLK, and DATA to MISO. It does not support MOSI or bidirectional data, so it functions as SPI slave output-only. Timing is compatible with standard SPI modes when CONV is asserted before CLK and held active for full 12–13 cycles.
What is the meaning of "differential input" in the ADS7834E/2K5G4, and how should –IN be connected?
The ADS7834E/2K5G4 accepts differential input between +IN and –IN, but –IN is restricted to ±0.2V range - it is not a true wide-range differential input. Its primary role is remote ground sensing: connect –IN to the local ground near the +IN signal source to cancel trace IR drop. Do not use –IN for large common-mode signals; tie to GND if source is local.
ADS7834E/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-VSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7834E/2K5G4 FAQ
1.How can I place an order for ADS7834E/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7834E/2K5G4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADS7834E/2K5G4 reliable?
The price and inventory of ADS7834E/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7834E/2K5G4 is usually 5 days.
3.What payment methods are accepted for ADS7834E/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7834E/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7834E/2K5G4?
ADS7834E/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7834E/2K5G4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADS7834E/2K5G4?
For technical support, including ADS7834E/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7834E/2K5G4 requirements.
6.How does Aetrix verify that ADS7834E/2K5G4 is sourced from the original manufacturer or authorized distributors?
All ADS7834E/2K5G4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADS7834E/2K5G4 meets industry standards.
7.What is the process for return or replacement of ADS7834E/2K5G4?
All ADS7834E/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7834E/2K5G4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADS7834E/2K5G4 part is unused and in its original packaging.
Return procedure for ADS7834E/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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