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Texas Instruments ADS7834EB/250
- Part No.:
- ADS7834EB/250
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7834EB/250.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,475
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Product details
Overview
ADS7834EB/250 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 data loggers requiring high-speed, low-power digitization.
For engineers reviewing the ADS7834EB/250 datasheet, ADS7834EB/250 pinout, ADS7834EB/250 application, or ADS7834EB/250 equivalent, key selection criteria include guaranteed no missing codes (12-bit), ±1 LSB integral linearity, MSOP-8 package compatibility, differential input handling for remote ground sensing, and support for LSB-first serial output via CONV control.
Technical Context
The ADS7834EB/250 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 is buffered and can be overdriven by an external 2.0V–2.55V source via a 10kΩ ±30% series resistor.
Digital interface timing is asynchronous between CONV and CLK: conversion start is edge-triggered by CONV falling, while serial data transfer is clock-synchronized. It supports three operational modes - full-speed conversion, power-down (2.5mW), and short-cycled conversion - with configurable LSB-first output enabled by precise CONV timing during the 13th clock cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes ensured across –40°C to +85°C - guarantees monotonicity and full code coverage in closed-loop control or precision monitoring. |
| Throughput Rate | 500kHz maximum - enables real-time sampling of signals up to ~350kHz usable bandwidth (SNR > 68dB). |
| Integral Linearity Error | ±1 LSB (ADS7834EB grade) - limits end-point error to ±0.61mV at 2.5V reference, critical for accurate sensor scaling. |
| Power Dissipation | 11mW at 500kHz; 2.5mW in power-down - allows duty-cycled operation in energy-constrained wireless sensors. |
| Analog Input Range | 0V to VREF (2.5V internal, or 2.0V–2.55V external) - sets full-scale span; differential input accepts ±0.2V common-mode on –IN for remote ground rejection. |
| Reference Drift | 20ppm/°C (internal) - contributes ~1 LSB full-scale drift per 12°C, necessitating external reference for <±0.5°C thermal stability. |
| Aperture Jitter | 30ps - limits SNR degradation at high input frequencies; enables clean 10kHz sine wave digitization (72dB SNR). |
Pinout & Package
ADS7834EB/250 is packaged in an MSOP-8 (DGK) surface-mount package, 3mm × 3mm × 1.05mm, with exposed thermal pad. Pin assignments are identical to the plastic DIP-8 variant but scaled for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VREF | Reference output/buffered voltage source | Provides 2.475–2.525V internal reference; must be decoupled with 0.1µF ceramic + 2.2µF tantalum to suppress SAR switching noise. |
| 2 - +IN | Noninverting analog input | Accepts 0V to VREF signal; input range limited to GND–0.2V to VREF+0.2V to maintain linearity. |
| 3 - –IN | Inverting analog input | Accepts –0.2V to +0.2V; used for remote ground sensing or differential biasing - not for true differential signal swing. |
| 4 - GND | Analog/digital ground reference | Single ground plane required; separates analog return path from digital switching currents to preserve 72dB SNR. |
| 5 - CONV | Asynchronous control input | Edge-triggered command: falling edge initiates hold/conversion; timing relative to CLK determines power-down or LSB-first mode. |
| 6 - DATA | Serial data output (3-state) | MSB-first by default; tri-states when CONV goes LOW; supports LSB-first if CONV toggled during 13th clock cycle. |
| 7 - CLK | Serial clock input | Accepts 200kHz–8MHz; duty cycle insensitive; minimum HIGH/LOW time = 50ns; defines conversion speed and data rate. |
| 8 - +VCC | Positive supply rail | +4.75V to +5.25V; requires 0.1µF ceramic + 10µF tantalum decoupling close to pin to stabilize internal reference and logic. |
Key Features
| Feature | Design Value |
|---|---|
| 12-bit no missing codes | Guaranteed monotonic transfer function across full temperature range - eliminates code ambiguities in closed-loop feedback systems. |
| Differential input architecture | Enables remote ground sensing via –IN pin, reducing ground loop errors in multi-node sensor arrays without external instrumentation amps. |
| Configurable serial output format | Supports both MSB-first (default) and LSB-first transmission via timed CONV assertion - simplifies alignment with DSP or microcontroller shift registers. |
| Asynchronous CONV/CLK interface | Decouples sampling trigger from clock domain - allows flexible integration with event-driven systems (e.g., burst-mode data capture on external trigger). |
| Low-power power-down mode | Reduces supply current to 0.5mA (2.5mW) between conversions - extends battery life in intermittent-sampling applications like environmental monitors. |
Applications
| Portable Spectrum Analyzer Front-End | Battery-Powered Multi-Channel Data Logger |
|---|---|
Use Scenario: Digitizing RF downconverted IF signals (up to 350kHz) in handheld field test equipment with limited thermal headroom and strict power budget. IC Role / Device Role / Timing Role: Primary ADC capturing baseband I/Q samples; synchronized to local oscillator-derived clock; CONV triggered by acquisition gate pulse. Use Value: 72dB SNR and 78dB SFDR enable accurate spectral peak detection; 500kHz throughput supports real-time FFT windowing; MSOP-8 footprint saves board space. |
Use Scenario: Simultaneous logging of temperature, pressure, and humidity from multiple sensors in remote IoT nodes powered by coin-cell batteries. IC Role / Device Role / Timing Role: Central SAR ADC multiplexed across sensor channels; operated in low-duty-cycle mode with CONV pulses spaced seconds apart. Use Value: 2.5mW power-down state extends battery life to >2 years; internal 2.5V reference eliminates need for external precision reference; differential inputs reject shared ground noise. |
| Wireless Communication Transceiver Monitor | DSP-Based Digital Signal Processing Interface |
Use Scenario: Monitoring transmit power amplifier output and receiver AGC voltage in Bluetooth/Wi-Fi modules where size and EMI sensitivity constrain component count. IC Role / Device Role / Timing Role: Auxiliary ADC for real-time PA bias control and RSSI estimation; interfaced via SPI-like timing using microcontroller GPIO for CONV. Use Value: LSB-first serial mode aligns with MCU SPI hardware; 30ps aperture jitter preserves dynamic range during fast AGC settling; small MSOP-8 avoids routing congestion near RF sections. |
Use Scenario: High-fidelity audio or vibration analysis subsystem where TI C54x/C6000 DSP processes raw sensor data with minimal latency. IC Role / Device Role / Timing Role: Synchronous ADC feeding buffered serial port (BSP); CONV tied to BFSX, CLK to BCLKX, DATA to BDR for zero-software-overhead transfers. Use Value: Asynchronous CONV/CLK timing eliminates setup/hold violations; 1.625µs conversion time enables sub-2µs sample-to-data latency; straight binary output avoids post-processing overhead. |
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 |
|---|---|---|---|
| ADS7832EB/250 | 10-bit resolution, same MSOP-8 package, identical pinout and interface - lacks 12-bit precision and ±1 LSB linearity guarantee. | Suitable only where 10-bit accuracy suffices (e.g., basic threshold detection), not for spectral analysis or calibrated sensor readout. | Select ADS7834EB/250 when 12-bit monotonicity and 72dB SNR are required; ADS7832EB/250 offers cost reduction where resolution is relaxed. |
| ADS7822U | 12-bit, 200ksps max throughput, 3.3V-only supply, different pinout (SO-8), no internal reference - requires external 2.5V reference and level-shifting for +5V systems. | Designed for low-voltage embedded systems; incompatible pin-for-pin and supply-domain with ADS7834EB/250. | Choose ADS7834EB/250 for +5V systems needing integrated reference and 500kHz speed; ADS7822U fits 3.3V battery designs with lower throughput needs. |
Compared with ADS7832EB/250 and ADS7822U, the ADS7834EB/250 uniquely combines 12-bit no-missing-codes performance, 500kHz throughput, +5V single-supply operation, and integrated 2.5V reference in MSOP-8 - making it optimal for portable, high-fidelity data acquisition where board space, power, and precision are jointly constrained.
Availability
ADS7834EB/250 is available at Aetrix Electronics and suitable for portable spectrum analyzers, battery-powered multi-channel data loggers, and wireless transceiver monitor circuits requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADS7834EB/250 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and digital signal technologies for industrial, automotive, and communications markets.
The ADS7834EB/250 belongs to TI's precision data acquisition product line, designed specifically for portable, low-power, high-speed analog-to-digital conversion in space- and energy-constrained systems where integration and reliability are critical.
FAQ
What is the guaranteed integral linearity error for ADS7834EB/250?
The ADS7834EB/250 is specified with ±1 LSB integral linearity error over –40°C to +85°C, distinguishing it from the standard ADS7834E grade (±2 LSB). This tighter specification ensures higher accuracy in calibrated measurement systems and reduces calibration burden in production test.
Does ADS7834EB/250 support LSB-first serial data output?
Yes, ADS7834EB/250 supports LSB-first serial output by asserting CONV LOW during the 13th clock cycle after conversion start. This mode is documented in Figure 5 of the SBAS098A datasheet and requires precise timing control but enables direct alignment with certain microcontroller SPI peripherals.
Can the internal 2.5V reference of ADS7834EB/250 drive external circuitry?
The internal 2.5V reference of ADS7834EB/250 can source up to 50µA static load, but its output is buffered through a 10kΩ ±30% resistor. Dynamic loads cause reference voltage variation, degrading ADC accuracy. For external buffering, use a dedicated reference IC rather than loading the ADS7834EB/250 VREF pin directly.
What is the minimum acquisition time required for ADS7834EB/250 to achieve 12-bit settling?
The ADS7834EB/250 requires a minimum acquisition time of 350ns to settle to 12-bit accuracy. This value is specified under typical conditions (+5V, 25°C) and assumes the analog source can charge the internal 20pF hold capacitor within that window - demanding low-impedance (<1kΩ) driving capability.
How does power consumption scale with sample rate in ADS7834EB/250?
ADS7834EB/250 quiescent current drops from 2.2mA at 500kHz to 0.5mA in power-down mode. At 100kHz, total power is ~9mW with continuous clocking but falls to ~4mW when using gated CLK and power-down between conversions - enabling >50% power savings in burst-mode applications.
ADS7834EB/250 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/250 FAQ
1.How can I place an order for ADS7834EB/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7834EB/250 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/250 reliable?
The price and inventory of ADS7834EB/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7834EB/250 is usually 5 days.
3.What payment methods are accepted for ADS7834EB/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7834EB/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7834EB/250?
ADS7834EB/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7834EB/250 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/250?
For technical support, including ADS7834EB/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7834EB/250 requirements.
6.How does Aetrix verify that ADS7834EB/250 is sourced from the original manufacturer or authorized distributors?
All ADS7834EB/250 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/250 meets industry standards.
7.What is the process for return or replacement of ADS7834EB/250?
All ADS7834EB/250 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7834EB/250, 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/250 part is unused and in its original packaging.
Return procedure for ADS7834EB/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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