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Texas Instruments ADS7835E/2K5
- Part No.:
- ADS7835E/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7835E/2K5.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,260
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Product details
Overview
ADS7835E/2K5 from Texas Instruments (formerly Burr-Brown) is a 12-bit, 500kHz throughput SAR analog-to-digital converter with integrated sample-and-hold, internal 2.5V reference, ±2.5V bipolar input range, and synchronous serial interface. It operates from a single +5V supply, dissipates 17.5mW at full rate, and supports power-down mode (2.5mW). It is used in portable spectrum analyzers and multi-channel data loggers requiring precision, low power, and compact size.
For engineers reviewing the ADS7835E/2K5 datasheet, ADS7835E/2K5 pinout, ADS7835E/2K5 application, or ADS7835E/2K5 equivalent, key selection criteria include guaranteed no missing codes, ±1 LSB integral linearity (E-grade), MSOP-8 thermal performance over –40°C to +85°C, bipolar input handling without external level-shifting, and serial timing compatibility with DSP or SPI microcontrollers.
Technical Context
The ADS7835E/2K5 implements a capacitive redistribution SAR architecture on 0.6µm CMOS, enabling true single-supply bipolar operation via an internal 2kΩ–2kΩ input divider referenced to its 2.5V bandgap. Conversion is clock-driven (200kHz–8MHz), with asynchronous CONV control enabling flexible sampling initiation independent of CLK edges.
Its serial interface outputs binary two's complement data MSB-first by default, but supports LSB-first transmission via controlled CONV timing during the 13th clock cycle - simultaneously entering power-down mode. The internal reference can be overdriven by an external 2.3V–2.9V source, and VREF pin bypassing requires both 0.1µF ceramic and 2.2µF tantalum capacitors for noise suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with guaranteed no missing codes - ensures monotonicity critical for closed-loop control and waveform digitization. |
| Throughput Rate | 500kHz maximum - enables real-time capture of signals up to ~200kHz Nyquist bandwidth. |
| Input Range | ±2.5V with internal reference - accepts true bipolar signals (e.g., AC-coupled sensor outputs) without external op-amp level-shifting. |
| Power Dissipation | 17.5mW at 500kHz; 2.5mW in power-down - supports battery life extension in portable instrumentation. |
| Integral Linearity | ±2 LSB (ADS7835E grade) - limits end-point error to ±2.44mV at 2.5V reference, suitable for 12-bit accuracy applications. |
| Reference Voltage | Internal 2.475V–2.525V (2.5V ±1%) - provides stable full-scale calibration without external component cost or layout area. |
| Package | MSOP-8 (3.0mm × 4.9mm, 0.65mm pitch) - enables high-density PCB layouts in space-constrained handheld test equipment. |
Pinout & Package
ADS7835E/2K5 is housed in an 8-pin MSOP package (Package Drawing 337), with dual ground pins (Pins 3 and 4) for improved noise immunity and thermal dissipation. Pin 1 (VREF) requires dedicated 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/buffered voltage source | Provides 2.5V ±1% internal reference; must be decoupled to suppress SAR switching noise and ensure <±0.5 LSB drift. |
| AIN (Pin 2) | Analog input node | Accepts ±2.5V bipolar signal via internal resistor divider; input impedance shifts between ~4kΩ (sample) and ~2kΩ (hold); buffer recommended for driving. |
| GND (Pins 3, 4) | Analog and digital ground return | Dual ground pins reduce ground bounce and improve PSRR; must connect to low-impedance analog ground plane. |
| CONV (Pin 5) | Asynchronous control input | Starts conversion, controls sample/hold transition, selects MSB/LSB-first output, and triggers power-down - timing relative to CLK determines functional mode. |
| DATA (Pin 6) | Serial data output | Three-state CMOS output; transmits 12-bit two's complement result synchronized to CLK rising edge; tri-states when CONV is low during conversion. |
| CLK (Pin 7) | Serial clock input | Accepts 200kHz–8MHz clock; duty cycle not critical if tCKH/tCKL ≥50ns; defines conversion speed and serial bit rate. |
| +VCC (Pin 8) | Positive supply rail | Operates from 4.75V–5.25V; supplies analog core, reference, and digital interface; requires local bulk + high-frequency decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed no missing codes | Ensures monotonic transfer function across full temperature range - eliminates code ambiguity in feedback control loops. |
| Internal 2.5V reference with ±1% tolerance | Eliminates need for external reference IC and associated passive components, reducing BOM count and board area in portable systems. |
| Asynchronous CONV control | Decouples sampling trigger from system clock domain - simplifies synchronization with external event sources (e.g., sensor interrupts). |
| Power-down mode with 2.5mW consumption | Reduces average power >85% at low sample rates (e.g., 50kHz), extending battery runtime without sacrificing first-conversion validity. |
| Bipolar ±2.5V input on single +5V supply | Enables direct connection to AC-coupled sensors or differential amplifiers without level-shifting circuitry or dual supplies. |
Applications
| Portable Spectrum Analyzer Front-End | Wireless Baseband Receiver Digitizer |
|---|---|
Use Scenario: Capturing RF IF signals (e.g., 10–100kHz baseband) in handheld field test equipment with limited battery capacity and strict size constraints. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog IF output; samples synchronously to local oscillator-derived clock; CONV triggered per acquisition burst. Use Value: 500kHz throughput and 72dB SNR enable accurate spectral analysis of narrowband signals; MSOP-8 footprint allows integration into palm-sized enclosures. |
Use Scenario: Digitizing demodulated analog voice/data channels in battery-powered wireless modems operating in ISM bands. IC Role / Device Role / Timing Role: High-fidelity analog front-end ADC interfacing directly to op-amp filter outputs; powered down between packet receptions to conserve energy. Use Value: ±2.5V bipolar input accepts AC-coupled baseband waveforms without DC restoration; 2.5mW power-down extends operational time between charges. |
| Multi-Channel Portable Data Logger | DSP-Based Motor Control Feedback Loop |
Use Scenario: Simultaneous logging of temperature, pressure, and vibration sensors in industrial handheld diagnostic tools. IC Role / Device Role / Timing Role: Channel-multiplexed ADC acquiring synchronized samples across 4–8 analog inputs; serial interface isolated via optocouplers for noise immunity. Use Value: Serial interface reduces isolation component count vs. parallel bus; guaranteed no missing codes prevents data corruption during long-term logging. |
Use Scenario: Real-time current/voltage sensing in closed-loop servo drives where latency and linearity directly impact torque ripple and stability. IC Role / Device Role / Timing Role: Critical feedback path ADC feeding TI C54x DSP; CONV tied to BFSX for hardware-synchronized sampling aligned with PWM cycles. Use Value: 1.625µs conversion time and <375ns step response minimize control loop delay; ±2 LSB INL meets IEC 61800-3 linearity requirements. |
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 |
|---|---|---|---|
| ADS7835EB/2K5 | ±1 LSB integral linearity (vs. ±2 LSB for ADS7835E/2K5); same package, pinout, and timing. | Suitable for higher-accuracy applications like precision instrumentation where <±1.22mV full-scale error is required. | Select ADS7835EB/2K5 only if tighter INL is mandated; otherwise ADS7835E/2K5 offers cost advantage with identical functionality. |
| ADS7822U | 12-bit, 200kHz max throughput; SPI-compatible interface; no internal reference; requires external 2.5V ref; SO-8 package. | Better suited for lower-speed, cost-sensitive designs where external reference is already present and board space allows SO-8. | Choose ADS7822U only if throughput ≤200kHz suffices and external reference infrastructure exists; ADS7835E/2K5 integrates reference and delivers 2.5× higher speed. |
Compared with ADS7835EB/2K5, the ADS7835E/2K5 trades ±1 LSB linearity for lower unit cost while retaining identical timing, power, and interface behavior. Against ADS7822U, it delivers higher throughput and eliminates reference sourcing complexity - critical for rapid prototyping and compact portable designs.
Availability
ADS7835E/2K5 is available at Aetrix Electronics and suitable for portable instrumentation, wireless communication front-ends, and industrial data acquisition systems requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for ADS7835E/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 acquired Burr-Brown in 2000 and maintains legacy precision analog product lines including high-performance data converters. TI is a global leader in analog IC design, manufacturing, and application support.
The ADS7835E/2K5 belongs to TI's legacy high-speed SAR ADC family, designed specifically for portable, battery-operated measurement systems demanding low power, small size, and guaranteed monotonicity without external support components.
FAQ
What is the guaranteed integral linearity error for ADS7835E/2K5?
The ADS7835E/2K5 has a guaranteed integral linearity (INL) error of ±2 LSB over the full –40°C to +85°C temperature range. This corresponds to ±2.44mV at the 2.5V reference voltage and ensures monotonic operation with no missing codes - a critical specification for control and measurement applications where code transitions must be predictable and repeatable. The ADS7835E/2K5 datasheet explicitly confirms this limit under "SPECIFICATIONS" for the ADS7835E grade.
Does ADS7835E/2K5 require an external reference voltage?
No, the ADS7835E/2K5 does not require an external reference voltage. It includes a fully integrated 2.5V bandgap reference with ±1% initial accuracy (2.475V–2.525V), enabling immediate operation with only +5V supply and proper VREF pin decoupling (0.1µF ceramic + 2.2µF tantalum). An external reference (2.3V–2.9V) may be applied to override the internal one for improved temperature stability or custom input ranges, but it is optional - the ADS7835E/2K5 functions fully with its internal reference.
What package type and dimensions does ADS7835E/2K5 use?
The ADS7835E/2K5 is packaged in an MSOP-8 (Mini Small Outline Package) with package drawing number 337. Its dimensions are 3.0mm × 4.9mm with 0.65mm lead pitch. The package features two ground pins (Pins 3 and 4) for enhanced thermal and noise performance. This compact, surface-mount footprint supports high-density PCB layouts in space-constrained applications such as handheld test equipment - a key design attribute confirmed in the "PACKAGE/ORDERING INFORMATION" section of the ADS7835E/2K5 datasheet.
Can ADS7835E/2K5 operate with a 3.3V supply?
No, the ADS7835E/2K5 is specified only for +5V operation (4.75V to 5.25V). Its internal reference, analog front-end, and CMOS logic levels are designed around a 5V supply rail. Attempting to operate the ADS7835E/2K5 at 3.3V will result in undefined behavior, failure to meet specifications (e.g., reduced SNR, increased INL), or non-functional operation. For 3.3V systems, designers should consider newer TI SAR ADCs such as the ADS7953 or ADS8688 families, which are explicitly rated for 3.3V supply compatibility.
How does the power-down mode work on ADS7835E/2K5?
The ADS7835E/2K5 enters power-down mode automatically when CONV remains LOW during conversion and stays LOW at the start of the 13th clock cycle - reducing supply current from 3.5mA to 0.5mA (2.5mW total dissipation). Power-down exits on the rising edge of CONV, with full functionality restored after tCVPU = 50ns. This mode incurs no conversion penalty: the first result after wake-up is valid. It is especially effective at low sample rates (e.g., 50kHz), where ADS7835E/2K5 achieves >90% power reduction versus continuous operation - a feature verified in the "POWER-DOWN TIMING" section and Figure 4 of the ADS7835E/2K5 datasheet.
ADS7835E/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:
- Single Ended
- 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:
- -
ADS7835E/2K5 FAQ
1.How can I place an order for ADS7835E/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7835E/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 ADS7835E/2K5 reliable?
The price and inventory of ADS7835E/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7835E/2K5 is usually 5 days.
3.What payment methods are accepted for ADS7835E/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7835E/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7835E/2K5?
ADS7835E/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7835E/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 ADS7835E/2K5?
For technical support, including ADS7835E/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7835E/2K5 requirements.
6.How does Aetrix verify that ADS7835E/2K5 is sourced from the original manufacturer or authorized distributors?
All ADS7835E/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 ADS7835E/2K5 meets industry standards.
7.What is the process for return or replacement of ADS7835E/2K5?
All ADS7835E/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7835E/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 ADS7835E/2K5 part is unused and in its original packaging.
Return procedure for ADS7835E/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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