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Texas Instruments ADS7834EB/2K5
- Part No.:
- ADS7834EB/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7834EB/2K5.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,751
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Product details
Overview
ADS7834EB/2K5 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 over –40°C to +85°C. It is used in portable spectrum analyzers and battery-powered remote data acquisition systems.
For engineers reviewing the ADS7834EB/2K5 datasheet, ADS7834EB/2K5 pinout, ADS7834EB/2K5 application, or ADS7834EB/2K5 equivalent, key selection considerations include its guaranteed no-missing-codes performance, ±1 LSB integral linearity (EB grade), MSOP-8 package compatibility, and support for LSB-first serial output via CONV timing control.
Technical Context
The ADS7834EB/2K5 implements a capacitive redistribution SAR architecture with an internal 2.5V bandgap reference buffered to drive the DAC array. Its conversion process is initiated asynchronously by the CONV signal, independent of CLK timing, enabling flexible interfacing with DSPs or microcontrollers using SPI-like protocols.
It features dual-mode serial output (MSB-first or LSB-first), programmable power-down entry after the 13th clock cycle, and short-cycle termination capability. Input range is 0V to VREF, with VREF externally overdrivable from 2.0V to 2.55V; analog inputs tolerate –0.2V to (VREF + 0.2V), and –IN is restricted to ±0.2V relative to GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes ensured across temperature - guarantees monotonicity and full code coverage in closed-loop control or precision monitoring. |
| Throughput Rate | 500 kHz maximum - enables real-time sampling of baseband signals up to ~350 kHz usable bandwidth (SNR > 68 dB). |
| Integral Linearity Error | ±1 LSB (ADS7834EB grade) - ensures <0.025% full-scale error for accurate voltage measurement without calibration. |
| Power Dissipation | 11 mW at 500 kHz; 2.5 mW in power-down - supports ultra-low-power operation in intermittent-sampling battery systems. |
| Reference Voltage | Internal 2.50 V ±0.025 V (20 ppm/°C drift) - sets 0V–2.5V input span; can be overdriven externally from 2.0V to 2.55V for custom scaling. |
| Analog Input Type | Differential (±IN), with –IN limited to ±0.2 V - supports remote ground sensing but not true wide-common-mode rejection. |
| Supply Voltage | +5 V ±5% (4.75 V to 5.25 V) - compatible with standard logic rails and eliminates need for dedicated analog supplies. |
Pinout & Package
ADS7834EB/2K5 is packaged in an 8-pin MSOP (DGK) with 0.65 mm pitch, rated for –40°C to +85°C operation. The package is RoHS-compliant and optimized for compact PCB layouts in portable instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VREF | Reference output/buffered reference input | Provides or accepts 2.0–2.55 V reference; requires 0.1 µF ceramic + 2.2 µF tantalum bypass to minimize noise-induced gain error. |
| 2 - +IN | Noninverting analog input | Accepts 0 V to VREF input; must stay within GND–0.2 V to VREF+0.2 V to maintain linearity spec. |
| 3 - –IN | Inverting analog input | Restricted to ±0.2 V range; used for remote ground sensing - not for high-common-mode rejection. |
| 4 - GND | Analog/digital ground reference | Single ground plane required; decoupling caps must connect here to minimize reference coupling errors. |
| 5 - CONV | Asynchronous convert/start/power-down control | Edge-triggered: falling edge initiates hold/conversion; held low during 13th clock enters power-down or LSB-first mode. |
| 6 - DATA | Serial data output (3-state) | MSB-first by default; tri-states when CONV goes low mid-conversion; outputs straight binary code. |
| 7 - CLK | Serial clock input | Accepts 200 kHz–8 MHz clock; duty cycle insensitive if tCKH/tCKL ≥50 ns; defines conversion speed when synchronized. |
| 8 - +VCC | Positive supply | +5 V supply; requires 0.1 µF ceramic + 10 µF tantalum decoupling; absolute max = 6 V. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed no missing codes | Ensures monotonic transfer function across –40°C to +85°C - critical for position feedback and closed-loop stability. |
| Programmable LSB-first serial output | Enables direct alignment with certain microcontroller shift registers without bit-reversal firmware overhead. |
| Asynchronous CONV control | Decouples sampling initiation from clock domain - simplifies trigger-based acquisition and reduces timing constraint burden. |
| Low-power power-down mode | Reduces current to 0.5 mA (2.5 mW) between conversions - extends battery life in duty-cycled sensor nodes. |
| Differential input with remote ground sense | Minimizes ground loop errors in distributed sensor systems where +IN source and system ground are physically separated. |
Applications
| Portable Spectrum Analyzer Front-End | Battery-Powered Remote Data Logger |
|---|---|
Use Scenario: Digitizing RF downconverted IF signals (e.g., 9.77 kHz–99.7 kHz) in handheld field test equipment with limited thermal headroom. IC Role / Device Role / Timing Role: High-speed, low-noise ADC capturing baseband waveforms with 72 dB SNR and 75 dB SFDR at 10 kHz. Use Value: Enables 12-bit resolution and 500 kHz throughput within 11 mW - meets size, power, and dynamic range requirements for portable RF diagnostics. |
Use Scenario: Multi-channel environmental monitoring (temperature, pressure, humidity) deployed in solar-powered field stations with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Low-power SAR ADC performing triggered single-shot conversions, entering power-down between samples. Use Value: Achieves 2.5 mW standby power and guaranteed monotonicity - extends battery life while preserving measurement integrity across temperature extremes. |
| DSP-Based Digital Signal Acquisition | Isolated Industrial Sensor Interface |
Use Scenario: Real-time vibration analysis in predictive maintenance systems using TI C54x DSP with buffered serial port (BSP). IC Role / Device Role / Timing Role: Synchronous serial ADC interfaced via BFSX (CONV), BCLKX (CLK), and BDR (DATA) with zero pipeline delay. Use Value: Eliminates software bit-shifting via MSB-first output and deterministic aperture jitter (<30 ps) - preserves phase coherence in FFT-based analysis. |
Use Scenario: Isolating analog sensor outputs (e.g., strain gauges) from noisy PLC backplanes using optocouplers or digital isolators on serial lines. IC Role / Device Role / Timing Role: Serial-output ADC minimizing component count - only three signal lines (CONV, CLK, DATA) require isolation. Use Value: Reduces isolation cost and board space vs parallel-output ADCs; maintains accuracy with 12-bit no-missing-codes guarantee post-isolation. |
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 architecture and pinout, but plastic DIP-8 package and ±2 LSB integral linearity (vs ±1 LSB for EB grade). | Preferred for through-hole prototyping or legacy board reuse; lacks MSOP-8 thermal and size advantages. | Select ADS7834P only when DIP-8 mechanical fit or lower-cost qualification is required - not for production miniaturized designs. |
| ADS7822U | 12-bit SAR ADC in MSOP-8, but 200 kSPS max throughput (vs 500 kSPS), no internal reference, and requires external REF. | Suitable for lower-speed, externally referenced systems where reference flexibility outweighs speed need. | Choose ADS7822U when external reference control is mandatory and 200 kSPS suffices - avoid when internal 2.5V ref or 500 kHz throughput is required. |
Compared with ADS7834P and ADS7822U, the ADS7834EB/2K5 uniquely combines MSOP-8 packaging, ±1 LSB linearity, internal 2.5V reference, and 500 kHz throughput - making it optimal for space-constrained, high-fidelity portable instrumentation requiring minimal external components.
Availability
ADS7834EB/2K5 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and DSP-accelerated signal acquisition systems requiring stable component supply, long-term manufacturability, and guaranteed industrial temperature operation.
Supply support for ADS7834EB/2K5 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 ADS7834EB/2K5 belongs to TI's precision SAR ADC product line, designed specifically for portable, low-power, high-throughput measurement systems where size, accuracy, and energy efficiency are co-optimized.
FAQ
What is the guaranteed integral linearity error for ADS7834EB/2K5?
The ADS7834EB/2K5 is specified with ±1 LSB integral linearity error over –40°C to +85°C, confirmed in the official SBAS098A datasheet under "SPECIFICATIONS" table for ADS7834EB grade. This is tighter than the ±2 LSB spec for the ADS7834E variant and directly enables high-accuracy DC measurements without end-point calibration.
Does ADS7834EB/2K5 support LSB-first serial output, and how is it enabled?
Yes, ADS7834EB/2K5 supports LSB-first serial output. It is enabled by asserting CONV HIGH during the 12th clock cycle and then pulling CONV LOW during the 13th clock cycle - as documented in Figure 5 and the "LSB FIRST DATA TIMING" section of SBAS098A. This mode also places the device into power-down after transmission.
What package type and marking does ADS7834EB/2K5 use?
ADS7834EB/2K5 uses the MSOP-8 package (DGK) with top-side laser marking "C34", per the "PACKAGE/ORDERING INFORMATION" table in SBAS098A. It is supplied in tape-and-reel format with 2500 units per reel, and is distinct from the DIP-8 (P) and rail-packaged variants.
Can the internal 2.5V reference of ADS7834EB/2K5 be overdriven, and what is the valid external voltage range?
Yes, the internal 2.5V reference of ADS7834EB/2K5 can be overdriven via the VREF pin. The valid external reference voltage range is 2.0 V to 2.55 V, as specified in the "REFERENCE INPUT" section of SBAS098A. This allows scaling the full-scale input range accordingly - e.g., 2.048 V yields 500 µV/LSB resolution.
What is the minimum acquisition time required for ADS7834EB/2K5 to achieve 12-bit settling?
The minimum acquisition time for ADS7834EB/2K5 is 350 ns, as stated in the "SPECIFICATIONS" table under "Acquisition Time". This value is guaranteed across temperature and ensures the internal sampling capacitor settles to 12-bit accuracy before conversion begins - critical for maintaining dynamic performance at 500 kHz throughput.
ADS7834EB/2K5 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:
- Active
- 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/2K5 FAQ
1.How can I place an order for ADS7834EB/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7834EB/2K5 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/2K5 reliable?
The price and inventory of ADS7834EB/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7834EB/2K5 is usually 5 days.
3.What payment methods are accepted for ADS7834EB/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7834EB/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7834EB/2K5?
ADS7834EB/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7834EB/2K5 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/2K5?
For technical support, including ADS7834EB/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7834EB/2K5 requirements.
6.How does Aetrix verify that ADS7834EB/2K5 is sourced from the original manufacturer or authorized distributors?
All ADS7834EB/2K5 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/2K5 meets industry standards.
7.What is the process for return or replacement of ADS7834EB/2K5?
All ADS7834EB/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7834EB/2K5, 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/2K5 part is unused and in its original packaging.
Return procedure for ADS7834EB/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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