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Texas Instruments ADS7834E/250G4
- Part No.:
- ADS7834E/250G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7834E/250G4.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,952
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Product details
Overview
ADS7834E/250G4 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 from a single +5V supply across –40°C to +85°C. It is used in portable spectrum analyzers and remote data acquisition systems requiring low-power, isolated serial interfacing.
For engineers reviewing the ADS7834E/250G4 datasheet, ADS7834E/250G4 pinout, ADS7834E/250G4 application, or ADS7834E/250G4 equivalent, key selection considerations include its guaranteed no-missing-codes performance, 12-bit integral linearity (±1 LSB for EB grade), 72dB SNR at 10kHz, 1.625µs conversion time, and MSOP-8 package compatibility with space-constrained battery-powered designs.
Technical Context
The ADS7834E/250G4 implements a capacitive redistribution SAR architecture fabricated in 0.6µm CMOS, enabling inherent sample/hold functionality without external components. Its internal 2.5V bandgap reference drives the capacitor DAC via a buffered output, reducing dynamic load sensitivity while maintaining 20ppm/°C drift.
Digital control is managed through a single CONV pin that synchronizes sampling, conversion start, serial data enable, and power-down entry - all independent of CLK timing. The serial interface supports both MSB-first (default) and LSB-first modes, with configurable clock rates from 200kHz to 8MHz and no pipeline delay between conversion initiation and data output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes over temperature - ensures monotonicity and full code coverage in closed-loop control or precision monitoring. |
| Throughput Rate | 500kHz maximum - enables real-time capture of signals up to 350kHz usable bandwidth (SNR > 68dB). |
| Power Dissipation | 11mW at 500kHz; drops to 2.5mW in power-down - reduces thermal load and extends battery life in portable instrumentation. |
| Input Range | 0V to VREF (2.5V internal or 2.0–2.55V external) - allows flexible scaling for 500µV/LSB (2.048V ref) or 610µV/LSB (2.5V ref) quantization steps. |
| Integral Linearity Error | ±1 LSB (ADS7834EB grade) - limits end-point error to ±0.024% FS, critical for calibration-sensitive measurement front-ends. |
| Signal-to-Noise Ratio | 72dB at 10kHz - supports ≥11.5 effective bits (ENOB) for high-fidelity signal digitization in DSP-based receivers. |
| Aperture Jitter | 30ps - contributes <0.05 LSB noise at 100kHz input, preserving dynamic performance in undersampling applications. |
Pinout & Package
ADS7834E/250G4 is packaged in an 8-pin MSOP (DGK) with 0.65mm pitch, optimized for compact PCB layouts and automated assembly. Thermal pad is not present; standard reflow profiles apply.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VREF | Reference output/input | Provides or accepts 2.0–2.55V reference; requires 0.1µF ceramic + 2.2µF tantalum bypass to ground for stability and noise suppression. |
| 2 +IN | Differential analog input (noninverting) | Accepts 0V to VREF input; must stay within GND–0.2V to VREF+0.2V to maintain linearity; drives 20pF internal sampling capacitor. |
| 3 –IN | Differential analog input (inverting) | Limited to –0.2V to +0.2V range; used for remote ground sensing or common-mode rejection of small offsets near signal source. |
| 4 GND | Analog/digital ground reference | Single ground plane required; decoupling caps for +VCC and VREF must connect here to minimize noise coupling into SAR core. |
| 5 CONV | Asynchronous control input | Triggers sample/hold transition on falling edge; initiates conversion, serial transfer, and power-down mode - timing independent of CLK. |
| 6 DATA | Serial data output | 3-state CMOS output; transmits 12-bit straight-binary result MSB-first by default; tri-states when CONV goes LOW during conversion. |
| 7 CLK | Serial clock input | Accepts 200kHz–8MHz clock; minimum HIGH/LOW times are 50ns; duty cycle not critical; controls conversion speed and data timing. |
| 8 +VCC | Power supply | +4.75V to +5.25V operation; requires 0.1µF ceramic + 10µF tantalum decoupling to GND; quiescent current is 2.2mA at 500kHz. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2.5V reference | Eliminates need for external reference IC; buffered output reduces sensitivity to dynamic loading, though 10kΩ series resistance requires careful bypassing. |
| Single-supply +5V operation | Enables direct integration with microcontrollers and DSPs without level-shifting or dual-rail supplies - simplifies power architecture in portable systems. |
| Differential input architecture | Rejects common-mode noise on –IN when referenced to remote ground; supports true differential measurements with 70dB DC CMRR and 50dB at 1MHz. |
| Configurable serial interface | Supports both MSB-first and LSB-first data transmission via CONV timing control - matches native formats of TI C54x DSPs and SPI/QSPI microcontrollers. |
| Power-down mode | Reduces supply current to 0.5mA (2.5mW) between conversions; entered automatically after 12th clock cycle if CONV remains LOW - ideal for burst-mode acquisition. |
Applications
| Portable Spectrum Analyzer Front-End | Wireless Baseband Receiver Digitizer |
|---|---|
Use Scenario: Captures RF downconverted IF signals (e.g., 9.77kHz–99.7kHz) in handheld test equipment with battery-limited runtime. IC Role / Device Role / Timing Role: ADC front-end performing high-fidelity digitization with 72dB SNR and 75dB SFDR to preserve spectral integrity. Use Value: 500kHz throughput and 350ns step response enable real-time FFT analysis; 11mW power enables >8hr operation on 2000mAh Li-ion cell. |
Use Scenario: Digitizes baseband I/Q signals in low-power wireless modems (e.g., Zigbee, Bluetooth LE) where EMI and size constrain component count. IC Role / Device Role / Timing Role: Precision SAR ADC providing 12-bit resolution and no missing codes for accurate demodulation in fading channel conditions. Use Value: Differential input rejects PCB-level noise; MSOP-8 footprint saves >40% board area vs DIP-8; serial interface enables optical isolation for ESD-prone antenna interfaces. |
| Remote Multi-Channel Data Logger | Battery-Powered Digital Signal Processing Node |
Use Scenario: Measures sensor outputs (temperature, pressure, vibration) across distributed industrial nodes powered by primary cells. IC Role / Device Role / Timing Role: Low-power ADC with programmable throughput (125kHz–500kHz) and automatic power-down between samples. Use Value: 2.5mW power-down state extends 10-year deployment life; 2.5V internal reference eliminates calibration drift from external ref IC aging. |
Use Scenario: Feeds real-time audio or motor control signals into embedded DSPs in cordless tools or portable medical devices. IC Role / Device Role / Timing Role: High-speed sampling ADC synchronized to DSP's BSP or QSPI peripheral with zero-latency data handoff. Use Value: No pipeline delay ensures deterministic timing for feedback loops; 1.625µs conversion time supports 20kHz control loop rates. |
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 |
|---|---|---|---|
| ADS7834P | Same core architecture and specs, but in plastic DIP-8 package; ±2 LSB integral linearity (vs ±1 LSB for EB grade); no tape-and-reel option. | Suitable for prototyping or through-hole production; lacks MSOP-8 thermal and density advantages for volume portable designs. | Select ADS7834P only for breadboarding or legacy DIP-based systems where reflow compatibility is not required. |
| ADS7822U | 12-bit SAR ADC with 1MSPS throughput, 2.7–5.25V supply, no internal reference; requires external 2.5V ref; MSOP-8 package. | Better speed and wider supply range, but higher 15mW power at full rate; lacks integrated reference and differential input capability. | Choose ADS7822U when >500kHz sampling is mandatory and external reference infrastructure already exists. |
Compared with ADS7834E/250G4, ADS7834P offers identical functionality in a through-hole package with relaxed linearity, while ADS7822U trades integrated reference and differential input for higher speed and supply flexibility - making ADS7834E/250G4 optimal for compact, low-power, self-contained measurement systems.
Availability
ADS7834E/250G4 is available at Aetrix Electronics and suitable for portable instrumentation, remote sensing nodes, and battery-powered signal acquisition systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ADS7834E/250G4 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 expertise in precision data converters and industrial-grade signal chain solutions.
The ADS7834E/250G4 belongs to TI's precision SAR ADC product line, designed specifically for portable, low-power, high-accuracy measurement applications where integration, size, and energy efficiency are critical system constraints.
FAQ
What is the operating temperature range for the ADS7834E/250G4?
The ADS7834E/250G4 is specified to operate across –40°C to +85°C, with full performance including 12-bit no-missing-codes guarantee, ±1 LSB integral linearity (EB grade), and 72dB SNR maintained throughout this industrial temperature range. This makes ADS7834E/250G4 suitable for deployment in outdoor sensors, automotive cabin modules, and portable test equipment exposed to ambient thermal extremes.
Does the ADS7834E/250G4 require an external reference voltage?
No, the ADS7834E/250G4 includes a factory-trimmed 2.5V internal bandgap reference, enabling immediate operation with 0V to 2.5V input range. However, the VREF pin accepts external references from 2.0V to 2.55V - useful for achieving specific LSB sizes (e.g., 500µV with 2.048V ref) or improved temperature stability. The internal reference remains active unless overdriven.
How does the CONV pin control power-down mode in the ADS7834E/250G4?
In the ADS7834E/250G4, power-down is activated when CONV is held LOW during conversion and remains LOW at the start of the 13th clock cycle - reducing supply current to 0.5mA. Power-up occurs on the rising edge of CONV, with tACQ = 350ns required before sampling begins. This asynchronous, pin-controlled method eliminates need for register writes or complex sequencing.
Can the ADS7834E/250G4 interface directly with SPI-compatible microcontrollers?
Yes, the ADS7834E/250G4 supports SPI-like operation: CONV acts as chip select, CLK as serial clock, and DATA as MISO. Its asynchronous CONV timing allows clean integration with GPIO-driven SPI masters. Unlike standard SPI, it requires no MOSI line - simplifying isolation and reducing component count in noise-sensitive environments.
What is the absolute maximum rating for analog input voltage on the ADS7834E/250G4?
The ADS7834E/250G4 specifies an absolute maximum analog input range of –0.2V to (VREF + 0.2V) on +IN, and –0.2V to +0.2V on –IN. Exceeding these limits risks linearity degradation or latch-up. For example, with internal 2.5V reference, +IN must stay within 0V to 2.7V, and –IN within –0.2V to +0.2V - ensuring reliable operation in noisy or floating-sensor applications.
ADS7834E/250G4 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:
- Discontinued at Digi-Key
- 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/250G4 FAQ
1.How can I place an order for ADS7834E/250G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7834E/250G4 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/250G4 reliable?
The price and inventory of ADS7834E/250G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7834E/250G4 is usually 5 days.
3.What payment methods are accepted for ADS7834E/250G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7834E/250G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7834E/250G4?
ADS7834E/250G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7834E/250G4 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/250G4?
For technical support, including ADS7834E/250G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7834E/250G4 requirements.
6.How does Aetrix verify that ADS7834E/250G4 is sourced from the original manufacturer or authorized distributors?
All ADS7834E/250G4 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/250G4 meets industry standards.
7.What is the process for return or replacement of ADS7834E/250G4?
All ADS7834E/250G4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7834E/250G4, 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/250G4 part is unused and in its original packaging.
Return procedure for ADS7834E/250G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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