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Texas Instruments ADS7834EB/2K5G4
- Part No.:
- ADS7834EB/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7834EB/2K5G4.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,799
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Product details
Overview
ADS7834EB/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 from a single +5V supply across –40°C to +85°C. It is used in portable spectrum analyzers and battery-powered multi-channel data loggers.
For engineers reviewing the ADS7834EB/2K5G4 datasheet, ADS7834EB/2K5G4 pinout, ADS7834EB/2K5G4 application, or ADS7834EB/2K5G4 equivalent, key selection criteria include guaranteed no missing codes over temperature, ±1 LSB integral linearity, 72dB SNR at 10kHz, 1.625µs conversion time, and MSOP-8 package compatibility with isolated serial data acquisition systems.
Technical Context
The ADS7834EB/2K5G4 implements a capacitive redistribution SAR architecture with an internal 2.5V bandgap reference buffered for DAC driving. Its differential analog input (+IN/–IN) enables remote ground sensing, with –IN limited to ±0.2V relative to GND to maintain linearity.
Conversion is initiated asynchronously by the CONV pin, independent of CLK timing; sampling occurs on the falling edge of CONV, and serial output (MSB-first by default) is synchronized to CLK rising edges. Power-down mode is entered when CONV remains low through the 13th clock cycle, reducing supply current to 0.5mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes ensured over –40°C to +85°C - guarantees monotonicity in closed-loop control or precision monitoring. |
| Throughput Rate | 500kHz maximum - supports real-time signal capture in portable spectrum analysis up to ~350kHz usable bandwidth. |
| Integral Linearity Error | ±1 LSB (ADS7834EB grade) - ensures <0.025% full-scale error for calibrated sensor interfaces. |
| Power Dissipation | 11mW at 500kHz, 2.5mW in power-down - enables >10-hour operation on coin-cell batteries in intermittent-sampling data loggers. |
| Reference Voltage | Internal 2.50V ±25mV (20ppm/°C drift) - sets 0V to 2.5V input range; externally overdrivable from 2.0V to 2.55V for custom scaling. |
| Input Configuration | Differential with 0V to VREF span - +IN accepts 0V–2.5V, –IN accepts –0.2V to +0.2V - supports single-ended use via grounded –IN or noise-rejecting remote sensing. |
| Serial Interface | Synchronous CMOS, MSB-first, 12-bit straight binary - compatible with SPI/QSPI controllers without level-shifting; DATA tri-states after transfer. |
Pinout & Package
ADS7834EB/2K5G4 is packaged in an MSOP-8 (DGK) surface-mount package, 3.0mm × 4.9mm × 1.0mm, rated for –40°C to +85°C operation. Pin 1 is VREF; pin 4 is GND; pin 5 is CONV (active-low control); pin 8 is +VCC. Decoupling requires 0.1µF ceramic + 10µF tantalum on +VCC and 0.1µF ceramic + 2.2µF tantalum on VREF.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference output/buffered voltage source | Provides 2.5V internal reference; can be overdriven externally (2.0V–2.55V); requires dual-capacitor bypass to suppress SAR-induced glitches. |
| +IN (Pin 2) | Noninverting analog input | Accepts 0V to VREF input; must stay within GND–0.2V to VREF+0.2V to maintain linearity; drives 20pF internal sampling capacitor. |
| –IN (Pin 3) | Inverting analog input | Limited to –0.2V to +0.2V; used for remote ground sensing or differential offset cancellation - not for full-scale differential signals. |
| GND (Pin 4) | Analog/digital ground reference | Single ground plane required; separates analog return path from digital switching noise; connects to external 0.1µF ceramic decoupling cap. |
| CONV (Pin 5) | Asynchronous convert/start-of-conversion control | Active-low; falling edge initiates sample-to-hold transition; duration controls power-down entry (low during 13th CLK cycle) and LSB-first mode. |
| DATA (Pin 6) | Serial data output | Three-state CMOS output; transmits 12-bit result MSB-first on CLK rising edges; goes high-impedance when CONV is low between conversions. |
| CLK (Pin 7) | Serial clock input | Accepts 200kHz–8MHz; duty cycle insensitive if tCKH/tCKL ≥50ns; not required during sample phase - enables burst-mode low-power operation. |
| +VCC (Pin 8) | Positive supply | +5V ±5% only; powers analog core, reference, and digital interface; requires local 0.1µF ceramic + 10µF tantalum decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed no missing codes | Ensured over full temperature range - eliminates code ambiguity in closed-loop feedback or threshold detection systems. |
| Integrated 2.5V reference with 20ppm/°C drift | Reduces BOM count and layout area; drift contributes ~1 LSB full-scale error per 12°C - sufficient for industrial logging, not metrology-grade. |
| Asynchronous CONV control | Enables trigger-based sampling independent of system clock - ideal for event-driven data capture in wireless sensor nodes. |
| Power-down mode with 0.5mA quiescent current | Permits >95% power reduction between conversions - extends battery life in low-duty-cycle applications like environmental monitors. |
| MSOP-8 package with thermal pad option | 3.0mm × 4.9mm footprint supports high-density PCB layouts; thermal resistance θJA ≈ 200°C/W - suitable for convection-cooled handheld devices. |
Applications
| Portable Spectrum Analyzer Front-End | Battery-Powered Multi-Channel Data Logger |
|---|---|
Use Scenario: Capturing RF baseband signals up to 350kHz bandwidth in handheld field test equipment with real-time FFT processing. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned IF output; provides deterministic 1.625µs conversion latency and jitter-free sampling synchronized to external trigger. Use Value: 72dB SNR and 75dB SFDR enable accurate amplitude/frequency measurement of weak signals amid noise floor; low 11mW dissipation prevents thermal drift during extended measurements. |
Use Scenario: Simultaneous acquisition from 4–8 sensors (temperature, humidity, vibration) in remote environmental monitoring nodes powered by AA batteries. IC Role / Device Role / Timing Role: High-precision front-end ADC multiplexed across channels; uses CONV-triggered sampling and power-down between reads to minimize average current. Use Value: ±1 LSB linearity ensures calibrated accuracy across temperature; 2.5mW power-down mode extends operational life to >1 year on two AA cells at 1Hz sampling rate. |
| DSP-Based Digital Signal Processing System | Isolated Remote Data Acquisition Node |
Use Scenario: Real-time motor control loop where ADC samples current/voltage feedback at 500kHz for field-oriented control algorithms on TI C54x DSP. IC Role / Device Role / Timing Role: Synchronous serial ADC interfaced to DSP's buffered serial port (BFSX/BCLKX/BDR); CONV tied to frame sync, CLK to bit clock. Use Value: MSB-first serial format and zero pipeline delay allow immediate use of conversion result in next instruction cycle; 500kHz throughput matches control loop bandwidth. |
Use Scenario: Industrial sensor node located in electrically noisy environment (e.g., near VFDs), requiring galvanic isolation between analog front-end and host MCU. IC Role / Device Role / Timing Role: Isolated ADC stage where serial DATA/CLK lines pass through optocouplers or digital isolators; CONV driven locally to avoid timing skew. Use Value: Low EMI serial interface and single-supply operation simplify isolated design; 0.1µF VREF bypass minimizes coupling of isolation barrier noise into reference path. |
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 | DIP-8 package, ±2 LSB integral linearity, same electrical specs - no MSOP thermal or size advantage. | Used in prototyping or through-hole legacy designs; lacks MSOP's board-area savings and thermal performance. | Select ADS7834P only for breadboarding or DIP-based evaluation; ADS7834EB/2K5G4 preferred for production SMT layouts. |
| ADS7822U | 12-bit, 200kSPS max, SPI-compatible, 2.7V–5.25V supply - lower speed, wider voltage range, no internal reference. | Suitable for ultra-low-voltage battery systems (e.g., 3.3V Li-ion) but cannot match 500kHz throughput or integrated reference simplicity. | Choose ADS7834EB/2K5G4 when 500kHz sampling, internal 2.5V reference, and MSOP-8 are required; ADS7822U fits lower-speed, wider-VCC designs. |
Compared with ADS7834P and ADS7822U, ADS7834EB/2K5G4 uniquely combines 500kHz throughput, ±1 LSB linearity, internal reference, and MSOP-8 packaging - making it optimal for space-constrained, high-speed portable instrumentation where calibration stability and power efficiency are critical.
Availability
ADS7834EB/2K5G4 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and DSP-based signal processing systems requiring stable component supply, consistent parametric performance, and long-term manufacturability.
Supply support for ADS7834EB/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 and embedded processing technologies, with decades of expertise in precision data converters and industrial-grade IC design.
The ADS7834EB/2K5G4 belongs to TI's precision SAR ADC product line, engineered for portable, low-power, high-throughput applications including handheld test equipment, remote sensing, and real-time control systems.
FAQ
What is the guaranteed integral linearity error for ADS7834EB/2K5G4?
The ADS7834EB/2K5G4 is specified with ±1 LSB integral linearity error over the full –40°C to +85°C temperature range. This is confirmed in the official SBAS098A datasheet under "SPECIFICATIONS" for ADS7834EB grade parts. The tighter tolerance versus the standard ADS7834E (±2 LSB) makes ADS7834EB/2K5G4 suitable for applications demanding higher DC accuracy, such as calibrated sensor interfaces or closed-loop control feedback paths.
Does ADS7834EB/2K5G4 support LSB-first serial data output?
Yes, ADS7834EB/2K5G4 supports LSB-first serial output using a specific CONV timing sequence: pull CONV HIGH before the end of the 12th clock cycle, then LOW during the 13th clock cycle (when D0 is transmitted). This triggers LSB-first retransmission of all 12 bits over the next 11 clocks and places the device into power-down mode. The feature is documented in Figure 5 and the "LSB FIRST DATA TIMING" section of the SBAS098A datasheet.
What is the minimum acquisition time required for ADS7834EB/2K5G4?
The minimum acquisition time for ADS7834EB/2K5G4 is 350ns, as specified in Table I ("Timing Specifications") of the SBAS098A datasheet. This value is valid across –40°C to +85°C and ensures the internal 20pF sampling capacitor settles to 12-bit accuracy. To meet this requirement, the analog source must drive the input with ≤1kΩ impedance and provide adequate settling headroom - especially critical in high-speed multiplexed systems.
Can the internal reference of ADS7834EB/2K5G4 be overdriven with an external voltage?
Yes, the internal 2.5V reference of ADS7834EB/2K5G4 can be overdriven via the VREF pin with an external voltage in the range of 2.0V to 2.55V. This is enabled by a 10kΩ ±30% series resistor between the internal reference and VREF pin. External references must be stable under capacitive load (0.1µF ceramic + 2.2µF tantalum) and capable of sourcing minimal current - the internal buffer isolates the DAC array, preserving linearity even with external reference sources.
What package type is used for ADS7834EB/2K5G4 and what are its key mechanical dimensions?
ADS7834EB/2K5G4 uses the MSOP-8 (DGK) package: 3.0mm width, 4.9mm length, and 1.0mm maximum height. Pin pitch is 0.65mm, and the package includes an exposed thermal pad (non-electrical) on the bottom. This compact footprint supports high-density PCB layouts in portable instruments, and its thermal resistance (θJA ≈ 200°C/W) is appropriate for convection-cooled handheld applications without forced airflow.
ADS7834EB/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:
- 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:
- -
ADS7834EB/2K5G4 FAQ
1.How can I place an order for ADS7834EB/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7834EB/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 ADS7834EB/2K5G4 reliable?
The price and inventory of ADS7834EB/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7834EB/2K5G4 is usually 5 days.
3.What payment methods are accepted for ADS7834EB/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7834EB/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7834EB/2K5G4?
ADS7834EB/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7834EB/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 ADS7834EB/2K5G4?
For technical support, including ADS7834EB/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7834EB/2K5G4 requirements.
6.How does Aetrix verify that ADS7834EB/2K5G4 is sourced from the original manufacturer or authorized distributors?
All ADS7834EB/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 ADS7834EB/2K5G4 meets industry standards.
7.What is the process for return or replacement of ADS7834EB/2K5G4?
All ADS7834EB/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7834EB/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 ADS7834EB/2K5G4 part is unused and in its original packaging.
Return procedure for ADS7834EB/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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