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Texas Instruments ADS7834E/2K5
- Part No.:
- ADS7834E/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7834E/2K5.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,595
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Product details
Overview
ADS7834E/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 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/2K5 datasheet, ADS7834E/2K5 pinout, ADS7834E/2K5 application, or ADS7834E/2K5 equivalent, key selection considerations include its 12-bit no-missing-codes performance, 2.5V internal reference with external overdrive capability (2.0V–2.55V), MSOP-8 package compatibility, and support for LSB-first serial output via CONV timing control.
Technical Context
The ADS7834E/2K5 implements a capacitive redistribution SAR architecture fabricated in 0.6µm CMOS, enabling inherent sample/hold functionality without external components. Its conversion is clocked externally (200kHz–8MHz), with asynchronous CONV control allowing flexible timing relative to CLK - supporting both DSP-style continuous-clock and microcontroller-style gated-clock operation.
It features dual-mode reference handling: internal 2.5V bandgap (±20ppm/°C drift, ±2 LSB integral linearity) or external reference overdriven through a 10kΩ ±30% series resistor. The differential analog input (+IN/–IN) supports remote ground sensing, while the VREF pin requires 0.1µF ceramic + 2.2µF tantalum bypassing to suppress SAR-induced glitches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes guaranteed over temperature - ensures 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). |
| Reference Voltage | Internal 2.50V ±25mV (2.475V–2.525V) - sets 0V to 2.5V input range; externally overdrivable from 2.0V to 2.55V for custom full-scale scaling. |
| Power Dissipation | 11mW at 500kHz; 2.5mW in power-down - reduces thermal load in battery-powered multi-channel loggers during idle intervals. |
| Differential Input Range | +IN – (–IN) = 0V to VREF; –IN limited to ±0.2V - supports remote ground sensing but not true wide-common-mode rejection. |
| Serial Interface | Synchronous, MSB-first by default; LSB-first enabled via CONV timing - simplifies integration with SPI peripherals and avoids need for bit-reversal firmware. |
| Integral Linearity Error | ±2 LSB (ADS7834E grade) - defines maximum deviation from ideal transfer curve, critical for accurate DC measurement and calibration. |
Pinout & Package
ADS7834E/2K5 is packaged in an 8-pin MSOP (DGK) with 0.65mm pitch, rated for –40°C to +85°C operation. Pin 1 (VREF) requires local 0.1µF ceramic + 2.2µF tantalum decoupling; Pin 8 (+VCC) requires 0.1µF ceramic + 10µF tantalum.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference output/buffer input | Provides or accepts reference voltage; internal 2.5V source or external 2.0V–2.55V overdrive point; high-impedance buffer drives DAC array. |
| +IN (Pin 2) | Noninverting analog input | Primary signal input; must stay within GND–0.2V to VREF+0.2V to maintain linearity; sampled onto 20pF hold capacitor. |
| –IN (Pin 3) | Inverting analog input | Remote ground sense or differential partner; restricted to ±0.2V range - not for wide common-mode rejection. |
| GND (Pin 4) | Analog/digital ground reference | Common return for analog inputs, reference, and digital I/O; separate AGND/DGND not implemented - requires star grounding. |
| CONV (Pin 5) | Asynchronous control input | Initiates sample/hold, starts conversion, triggers serial output, and controls power-down/LSB-first mode via timing relative to CLK. |
| DATA (Pin 6) | Serial data output | Tri-state CMOS output; transmits 12-bit straight-binary result MSB-first (or LSB-first if CONV timed); high-impedance when inactive. |
| CLK (Pin 7) | Serial clock input | Edge-triggered (rising edge latches data); frequency determines throughput (16× fSAMPLE typical); duty cycle not critical. |
| +VCC (Pin 8) | Power supply | +5V ±5% supply; powers analog core, reference, and digital interface; requires local decoupling to limit noise coupling into VREF. |
Key Features
| Feature | Design Value |
|---|---|
| 12-bit no-missing-codes performance | Guaranteed monotonic transfer function over –40°C to +85°C - eliminates code ambiguities in closed-loop feedback or threshold detection. |
| Internal 2.5V reference with external overdrive | Eliminates external reference IC; allows precise full-scale adjustment (e.g., 2.048V for 500µV/LSB) while retaining internal simplicity. |
| Asynchronous CONV control | Decouples sampling initiation from clock domain - enables deterministic trigger-based acquisition and flexible microcontroller interfacing. |
| Power-down mode (2.5mW) | Reduces average power by >75% at low sample rates (e.g., 50kHz) - extends battery life in portable data loggers without sacrificing first-conversion validity. |
| LSB-first serial output option | Configurable via CONV timing - avoids software bit-reversal overhead when interfacing with legacy SPI peripherals lacking MSB-first support. |
Applications
| Portable Spectrum Analyzer Front-End | Wireless Baseband Monitoring |
|---|---|
|
Use Scenario: Digitizing IF or baseband signals in handheld RF test equipment with tight size and battery-life constraints. IC Role / Device Role / Timing Role: Primary ADC capturing 0–2.5V differential analog inputs; synchronized to FPGA or DSP via CONV/CLK for burst-mode acquisition. Use Value: 500kHz throughput and 72dB SNR enable real-time spectral analysis up to 350kHz; MSOP-8 footprint minimizes PCB area in compact enclosures. |
Use Scenario: Monitoring transmit/receive chain signals in battery-powered IoT gateways or small-cell radios. IC Role / Device Role / Timing Role: High-fidelity signal capture for RSSI, PA bias control, or distortion feedback; powered down between bursts using CONV timing. Use Value: 2.5mW power-down current extends operational time; internal reference eliminates BOM cost and layout complexity of discrete reference ICs. |
| Multi-Channel Portable Data Logger | Isolated Remote Sensor Interface |
|
Use Scenario: Simultaneous logging of voltage, temperature, and current from multiple sensors in field-deployable environmental monitors. IC Role / Device Role / Timing Role: Channel-sampling ADC with differential inputs rejecting ground offsets between sensor nodes and host MCU. Use Value: ±0.2V –IN range enables remote ground sensing; 12-bit resolution supports <1mV measurement accuracy across 0–2.5V span. |
Use Scenario: Digitizing analog sensor outputs across galvanic isolation barriers in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Isolation-side ADC feeding optocoupler or digital isolator; serial interface reduces isolation channel count vs parallel bus. Use Value: Synchronous serial interface lowers component count and board space vs parallel-output ADCs; 11mW dissipation eases isolated-side thermal design. |
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 |
|---|---|---|---|
| ADS7835E/2K5 | 12-bit, 1MSPS throughput, 15mW at full speed, same MSOP-8 package and pinout - higher speed but higher power and cost. | Better suited for real-time oscilloscope front-ends requiring >500kHz sustained sampling; less optimal for ultra-low-power battery use. | Select ADS7835E/2K5 only if throughput >500kHz is mandatory and system power budget permits +4mW increase. |
| MAX1113EUA+ | 12-bit, 500kHz, 3.3V-only supply, internal reference fixed at 2.048V, different pinout (Umax-8) - incompatible voltage and pin mapping. | Designed for 3.3V systems with fixed 2.048V full-scale; requires level-shifting or redesign for +5V host interfaces. | Choose MAX1113EUA+ only when migrating to 3.3V architecture and 2.048V scaling is preferred; not drop-in compatible with ADS7834E/2K5. |
Compared with ADS7834E/2K5, ADS7835E/2K5 offers higher throughput at increased power, while MAX1113EUA+ enforces 3.3V operation and fixed 2.048V reference - making ADS7834E/2K5 the optimal choice for +5V, 2.5V-referenced, low-power portable designs requiring pin-compatible upgrade paths.
Availability
ADS7834E/2K5 is available at Aetrix Electronics and suitable for portable instrumentation, wireless infrastructure monitoring, and isolated industrial data acquisition requiring stable component supply and long-term manufacturability.
Supply support for ADS7834E/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 expertise in precision data converters and industrial-grade signal chain solutions.
The ADS7834E/2K5 belongs to TI's precision SAR ADC product line, designed specifically for portable, low-power, and isolated data acquisition systems where size, power efficiency, and integrated reference simplicity are critical.
FAQ
What is the operating temperature range for the ADS7834E/2K5?
The ADS7834E/2K5 is specified to operate across –40°C to +85°C ambient temperature. All electrical parameters - including integral linearity (±2 LSB), offset error (±2 LSB), and reference voltage (2.475V–2.525V) - are guaranteed within this range. This makes ADS7834E/2K5 suitable for industrial and outdoor portable equipment deployments.
Does the ADS7834E/2K5 require an external reference voltage?
No, the ADS7834E/2K5 includes an internal 2.5V bandgap reference that fully supports operation with 0V to 2.5V analog input range. An external reference is optional and only needed when a different full-scale voltage (e.g., 2.048V) or improved temperature stability (<20ppm/°C) is required. The internal reference is sufficient for most portable and general-purpose applications using ADS7834E/2K5.
How does the power-down mode work on the ADS7834E/2K5?
The ADS7834E/2K5 enters power-down mode when CONV remains LOW during conversion and stays LOW at the start of the 13th clock cycle. Power dissipation drops to 2.5mW, and the device wakes instantly on the next CONV rising edge with no pipeline delay. This feature is actively used in ADS7834E/2K5-based battery loggers to reduce average current draw between samples without compromising first-conversion validity.
Can the ADS7834E/2K5 interface directly with an SPI controller?
Yes, the ADS7834E/2K5 supports SPI-like operation: CONV acts as chip select, CLK as serial clock, and DATA as MISO. Though not SPI-compliant by protocol (no MOSI or SS handshake), its timing allows direct connection to standard microcontroller SPI peripherals using GPIO-controlled CONV. The ADS7834E/2K5 datasheet explicitly documents QSPI and SPI interfacing modes, confirming robust compatibility.
What is the maximum clock frequency supported by the ADS7834E/2K5?
The ADS7834E/2K5 accepts an external clock from 200kHz to 8MHz. At 8MHz, it achieves its maximum 500kHz throughput rate (16 clocks per conversion). Clock duty cycle is not critical, but minimum HIGH and LOW times must each be ≥50ns, and period ≥125ns. Exceeding 8MHz violates timing specifications and risks conversion errors in ADS7834E/2K5 operation.
ADS7834E/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:
- -
ADS7834E/2K5 FAQ
1.How can I place an order for ADS7834E/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7834E/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 ADS7834E/2K5 reliable?
The price and inventory of ADS7834E/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7834E/2K5 is usually 5 days.
3.What payment methods are accepted for ADS7834E/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7834E/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7834E/2K5?
ADS7834E/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7834E/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 ADS7834E/2K5?
For technical support, including ADS7834E/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7834E/2K5 requirements.
6.How does Aetrix verify that ADS7834E/2K5 is sourced from the original manufacturer or authorized distributors?
All ADS7834E/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 ADS7834E/2K5 meets industry standards.
7.What is the process for return or replacement of ADS7834E/2K5?
All ADS7834E/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7834E/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 ADS7834E/2K5 part is unused and in its original packaging.
Return procedure for ADS7834E/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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