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Texas Instruments ADS7834EB/250G4
- Part No.:
- ADS7834EB/250G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7834EB/250G4.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,114
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Product details
Overview
ADS7834EB/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 over –40°C to +85°C in MSOP-8 package. It is used in portable spectrum analyzers and battery-powered remote data acquisition systems.
For engineers reviewing the ADS7834EB/250G4 datasheet, ADS7834EB/250G4 pinout, ADS7834EB/250G4 application, or ADS7834EB/250G4 equivalent, key selection considerations include guaranteed no missing codes, ±1 LSB integral linearity, 72dB SNR at 10kHz, 500kHz max throughput, and support for LSB-first serial output via CONV timing control.
Technical Context
The ADS7834EB/250G4 implements a capacitive redistribution SAR architecture with on-chip 2.5V bandgap reference and internal buffer. Its conversion process is initiated asynchronously by the CONV signal, independent of CLK edge 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 at the 13th clock cycle, and short-cycle conversion termination. 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 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 | 500 kHz maximum - enables real-time sampling of 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 DC measurement and calibration-critical applications. |
| Power Dissipation | 11 mW at 500 kHz; 2.5 mW in power-down - supports extended battery life in portable instrumentation with rapid wake-up capability. |
| Reference Voltage | Internal 2.5 V ±0.025 V (20 ppm/°C drift); overdrivable 2.0–2.55 V - allows precise input scaling (e.g., 2.048 V → 500 µV/LSB) and improved temperature stability with external refs. |
| Signal-to-Noise Ratio | 72 dB at 10 kHz input - supports >11.5 effective number of bits (ENOB) for high-fidelity signal capture in spectral analysis. |
| Differential Input Range | +IN to –IN = 0 V to VREF; –IN limited to ±0.2 V - enables remote ground sensing but not true wide-common-mode rejection; requires low-impedance source for <350 ns acquisition. |
Pinout & Package
ADS7834EB/250G4 is packaged in an 8-pin MSOP (DGK), 3.0 mm × 3.0 mm × 1.0 mm body, with exposed thermal pad (not electrically connected). Pin 1 is marked by beveled corner; device is RoHS-compliant and moisture-sensitive level 2a.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference output/buffered voltage source | Provides 2.5 V internal reference; must be bypassed with 0.1 µF ceramic + 2.2 µF tantalum; accepts external 2.0–2.55 V reference via 10 kΩ series resistor. |
| +IN (Pin 2) | Noninverting analog input | Accepts 0 V to VREF input; voltage must stay within GND – 0.2 V to VREF + 0.2 V to maintain linearity; drives 20 pF internal sampling capacitor. |
| –IN (Pin 3) | Inverting analog input | Limited to ±0.2 V relative to GND; used for remote ground sensing - not for wide common-mode rejection; disconnects during conversion. |
| GND (Pin 4) | Analog/digital ground reference | Single ground plane required; decoupling caps for +VCC and VREF must reference this pin directly to minimize noise coupling into SAR core. |
| CONV (Pin 5) | Asynchronous control input | Starts sampling on rising edge, initiates hold/conversion on falling edge; controls power-down (held LOW at 13th CLK), LSB-first mode, and short-cycle termination. |
| DATA (Pin 6) | Serial data output | 3-state CMOS output; transmits 12-bit straight-binary result MSB-first (default) or LSB-first (via CONV timing); tri-states when CONV goes LOW. |
| CLK (Pin 7) | Serial clock input | Accepts 200 kHz–8 MHz clock; duty cycle not critical if tCKH/tCKL ≥ 50 ns; clock may be gated or continuous; defines conversion speed when synchronized to CONV. |
| +VCC (Pin 8) | Positive supply | +5 V ±5% (4.75–5.25 V); requires local 0.1 µF ceramic + 10 µF tantalum decoupling; powers analog core, reference, and digital interface. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed no missing codes | Ensures monotonic transfer function across full temperature range - essential for closed-loop feedback and servo control where code gaps cause instability. |
| Programmable LSB-first serial output | Enables direct compatibility with legacy microcontroller SPI peripherals that expect LSB-first framing without software bit-reversal overhead. |
| Asynchronous CONV control | Decouples sampling initiation from clock domain - simplifies timing design in mixed-signal systems with asynchronous triggers or event-driven acquisition. |
| Low-power power-down mode | Reduces supply current to 0.5 mA (2.5 mW) between conversions - cuts average power >90% at 50 kHz sample rate versus continuous operation. |
| Differential input with remote ground sense | Allows +IN signal path to be referenced to local system ground while –IN connects to remote sensor ground - mitigates ground loop errors in distributed measurement systems. |
Applications
| Portable Spectrum Analyzer Front-End | Battery-Powered Multi-Channel Data Logger |
|---|---|
Use Scenario: Capturing RF IF signals (up to ~350 kHz) in handheld field test equipment with real-time FFT processing. IC Role / Device Role / Timing Role: High-speed, low-noise ADC digitizing conditioned analog IF outputs; provides deterministic 1.625 µs conversion time and aperture jitter <30 ps. Use Value: 72 dB SNR and 75 dB SFDR enable resolution of small signals adjacent to large interferers; 500 kHz throughput supports 1024-point FFT at >480 updates/sec. |
Use Scenario: Simultaneous logging of temperature, pressure, and vibration from 4–8 sensors in remote environmental monitoring nodes. IC Role / Device Role / Timing Role: Low-power, rail-compatible ADC interfaced to MSP430 or similar ultra-low-power MCU via 3-wire SPI; CONV triggered per channel. Use Value: 2.5 mW power-down mode extends 2xAA battery life to >2 years at 10 Hz aggregate sampling; internal 2.5 V reference eliminates external ref IC BOM cost. |
| Wireless Communication Baseband Receiver | DSP-Based Digital Signal Processing Interface |
Use Scenario: Digitizing baseband I/Q signals in narrowband IoT transceivers (e.g., LoRa, NB-IoT) with dynamic range >70 dB. IC Role / Device Role / Timing Role: Precision SAR ADC providing 12-bit resolution with <±1 LSB INL for coherent demodulation and channel estimation algorithms. Use Value: ±1 LSB integral linearity ensures <0.025% gain error propagation into DSP filters; differential input rejects PCB-level noise coupling in compact RF layouts. |
Use Scenario: Interfacing analog sensor outputs to TI C54x/C67x DSPs using buffered serial port (BSP) with hardware handshaking. IC Role / Device Role / Timing Role: Synchronous serial ADC with CONV tied to BFSX, CLK to BCLKX, DATA to BDR - eliminating GPIO bit-banging overhead. Use Value: Asynchronous CONV-to-CLK timing allows seamless integration with DSP frame sync; MSB-first output matches native DSP word ordering for zero-latency DMA transfers. |
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 INL (vs ±1 LSB for EB grade); higher thermal resistance; no tape-and-reel option. | Suitable for lab prototypes or low-volume industrial controllers where MSOP size or production automation is not required. | Select ADS7834P only for through-hole assembly or manual prototyping; ADS7834EB/250G4 preferred for automated SMT and performance-critical designs. |
| ADS8320EB/250 | 16-bit SAR ADC, 100 kHz max throughput, 2.5 mW power-down, SPI-compatible, same MSOP-8 package; no internal reference - requires external ref. | Used where higher resolution (>12-bit) is mandatory (e.g., precision weigh scales), but sacrifices speed and adds BOM complexity. | Choose ADS8320EB/250 only when ENOB >13 bits is required; ADS7834EB/250G4 remains optimal for 500 kHz–350 kHz bandwidth applications needing integrated reference and lower latency. |
Compared with ADS7834P and ADS8320EB/250, the ADS7834EB/250G4 uniquely balances 500 kHz throughput, ±1 LSB linearity, integrated 2.5 V reference, and MSOP-8 manufacturability - making it the most cost-effective solution for portable high-speed data acquisition where 12-bit fidelity suffices.
Availability
ADS7834EB/250G4 is available at Aetrix Electronics and suitable for portable instrumentation, wireless baseband receivers, and battery-powered multi-channel data loggers requiring stable component supply across long production lifecycles.
Supply support for ADS7834EB/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 leadership in precision data converters and signal chain solutions.
The ADS7834EB/250G4 belongs to TI's precision SAR ADC product line, designed specifically for portable, low-power, high-throughput measurement systems where integration, size, and guaranteed performance over temperature are critical.
FAQ
What is the guaranteed integral linearity error for ADS7834EB/250G4?
The ADS7834EB/250G4 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 ensures consistent accuracy in calibration-sensitive applications like portable test equipment where code-to-code deviation must remain below 0.025% of full scale.
Does ADS7834EB/250G4 support LSB-first serial data output?
Yes, ADS7834EB/250G4 supports LSB-first serial output via precise timing control of the CONV pin: pull CONV HIGH before the end of the 12th clock cycle and then LOW during the 13th clock cycle (when D0 is transmitted). This triggers LSB-first retransmission of all 12 bits and simultaneously places the device into power-down mode until CONV rises again - a feature documented in Figure 5 and "LSB FIRST DATA TIMING" section of SBAS098A.
What is the minimum acquisition time required for ADS7834EB/250G4?
The ADS7834EB/250G4 requires a minimum acquisition time of 350 ns, as specified in Table I ("Timing Specifications") of SBAS098A. This is the time needed for the internal 20 pF sampling capacitor to settle to 12-bit accuracy after the CONV falling edge initiates hold mode. External source impedance must be low enough to achieve this - typically ≤1 kΩ - otherwise additional external buffering or longer sample periods are required.
Can ADS7834EB/250G4 operate with an external reference voltage?
Yes, ADS7834EB/250G4 can operate with an external reference voltage applied to the VREF pin, within 2.0 V to 2.55 V. The internal 2.5 V reference is connected via a 10 kΩ ±30% series resistor, allowing clean overdrive. External references improve temperature stability (e.g., <5 ppm/°C vs 20 ppm/°C internal) and enable custom full-scale ranges such as 2.048 V for exact 500 µV/LSB scaling - both confirmed in the "EXTERNAL REFERENCE" section of SBAS098A.
What package type and marking does ADS7834EB/250G4 use?
ADS7834EB/250G4 uses the MSOP-8 (DGK) package, 3.0 mm × 3.0 mm × 1.0 mm, with exposed thermal pad. Its top-side laser marking is "C34", as specified in the "PACKAGE/ORDERING INFORMATION" table of SBAS098A. The "/250G4" suffix denotes tape-and-reel packaging of 250 units per reel with moisture sensitivity level 2a handling requirements.
ADS7834EB/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:
- 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/250G4 FAQ
1.How can I place an order for ADS7834EB/250G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7834EB/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 ADS7834EB/250G4 reliable?
The price and inventory of ADS7834EB/250G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7834EB/250G4 is usually 5 days.
3.What payment methods are accepted for ADS7834EB/250G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7834EB/250G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7834EB/250G4?
ADS7834EB/250G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7834EB/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 ADS7834EB/250G4?
For technical support, including ADS7834EB/250G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7834EB/250G4 requirements.
6.How does Aetrix verify that ADS7834EB/250G4 is sourced from the original manufacturer or authorized distributors?
All ADS7834EB/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 ADS7834EB/250G4 meets industry standards.
7.What is the process for return or replacement of ADS7834EB/250G4?
All ADS7834EB/250G4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7834EB/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 ADS7834EB/250G4 part is unused and in its original packaging.
Return procedure for ADS7834EB/250G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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