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Texas Instruments ADS7835E/250G4
- Part No.:
- ADS7835E/250G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7835E/250G4.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,192
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Product details
Overview
ADS7835E/250G4 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, and synchronous serial interface. It operates from a single +5V supply, delivers ±2.5V bipolar input range, and achieves 72dB SNR at 10kHz - ideal for portable spectrum analyzers and multi-channel battery-powered data loggers.
For engineers reviewing the ADS7835E/250G4 datasheet, ADS7835E/250G4 pinout, ADS7835E/250G4 application, or ADS7835E/250G4 equivalent, key selection considerations include guaranteed no-missing-codes performance, power-down mode reducing dissipation to 2.5mW, MSOP-8 package compatibility with space-constrained PCB layouts, and binary two's complement output format for direct DSP interfacing.
Technical Context
The ADS7835E/250G4 implements a capacitive redistribution SAR architecture fabricated in 0.6µm CMOS, enabling true bipolar input operation without external level-shifting. Its internal 2.5V bandgap reference drives a buffered CDAC, with input range directly scaled as ±VREF - supporting both internal reference use and external overdrive from 2.3V to 2.9V.
Digital interface timing is decoupled from conversion control: CONV governs sample/hold transitions asynchronously to CLK, while serial data (MSB-first by default) is synchronized to CLK edges. Power-down entry occurs on the 13th clock cycle when CONV remains LOW, with full recovery requiring ≥350ns acquisition time after CONV rising edge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes - ensures monotonicity and eliminates code gaps in closed-loop control feedback paths. |
| Throughput Rate | 500kHz maximum - supports real-time acquisition of signals up to ~200kHz Nyquist bandwidth with adequate oversampling margin. |
| Input Range | ±2.5V with internal reference - enables direct measurement of AC-coupled sensor outputs or differential signals referenced to mid-supply. |
| Power Dissipation | 17.5mW typical at 500kHz; 2.5mW in power-down - extends battery life in handheld instruments by >85% during idle intervals. |
| INL / DNL | ±2LSB / ±0.8LSB max - maintains <0.05% full-scale linearity error for precision transducer digitization in industrial DAQ systems. |
| SNR | 72dB at 10kHz input - provides >11.5 effective number of bits (ENOB) for high-fidelity signal reconstruction in audio and comms applications. |
| Reference Output | 2.50V ±25mV, 50µA source capability - sufficient to drive external op-amp bias networks but not dynamic loads due to 10kΩ series impedance. |
| Operating Temp | –40°C to +85°C - qualified for deployment in automotive cabin modules and outdoor environmental monitoring equipment. |
Pinout & Package
ADS7835E/250G4 is housed in an MSOP-8 (337 drawing) package - 3mm × 3mm body, 0.65mm pitch, exposed pad optional - optimized for thermal management and high-density routing in portable instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference output/buffered reference input | Provides 2.5V internal reference; accepts external 2.3V–2.9V reference via 10kΩ series resistor; requires 0.1µF ceramic + 2.2µF tantalum bypass. |
| AIN (Pin 2) | Analog input | ±2.5V bipolar input node; internally biased via 2kΩ–2kΩ divider; 4kΩ input impedance during sampling; must stay within –5.3V to +5.3V absolute max. |
| GND (Pins 3 & 4) | Analog/digital ground | Separate ground pins minimize digital switching noise coupling into analog path; both must connect to low-impedance system ground plane. |
| CONV (Pin 5) | Convert control input | Asynchronous command: falling edge initiates hold mode; rising edge starts sampling; duration controls power-down entry and LSB-first data mode. |
| DATA (Pin 6) | Serial data output | Three-state CMOS output; MSB-first by default; tri-states when CONV goes LOW during conversion; compatible with TI BSP and SPI/QSPI protocols. |
| CLK (Pin 7) | Serial clock input | Accepts 200kHz–8MHz clock; duty cycle insensitive if tH/tL ≥50ns; synchronizes data transfer and determines conversion speed (fCLK = 16×fSAMPLE). |
| +VCC (Pin 8) | Power supply | +5V ±5% supply; requires 0.1µF ceramic + 10µF tantalum decoupling; supports 3.5mA quiescent current at 500kHz throughput. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2.5V reference | Eliminates need for external reference IC or precision resistor network - reduces BOM count and layout area in cost-sensitive portable designs. |
| Guaranteed no missing codes | Ensures deterministic behavior in servo control loops and safety-critical threshold detection where code discontinuities could cause system instability. |
| Power-down mode (2.5mW) | Enables microcontroller-gated acquisition - e.g., wake-on-event sampling in wireless sensor nodes - with zero conversion latency upon exit. |
| Bipolar ±VREF input range | Supports direct digitization of AC signals (e.g., vibration sensors, audio preamps) without external op-amp level-shifting circuitry. |
| Binary two's complement output | Delivers signed integer data natively compatible with TI C54x/C67x DSPs and ARM Cortex-M MCUs - avoids software sign-extension overhead. |
| Short-cycle conversion | Allows early termination of SAR process for coarse measurements - cuts conversion time by up to 75% when 8–10 bit resolution suffices. |
Applications
| Portable Spectrum Analyzer | Battery-Powered Data Logger |
|---|---|
Use Scenario: Real-time RF signal analysis in handheld field test equipment with limited battery capacity and strict size constraints. IC Role / Device Role / Timing Role: Primary ADC capturing baseband I/Q samples at 500kHz; internal reference ensures stable full-scale across temperature drift. Use Value: 72dB SNR and ±2LSB INL preserve spectral fidelity for accurate harmonic distortion measurement; 2.5mW power-down extends runtime between charges. |
Use Scenario: Multi-channel environmental monitoring (temperature, humidity, gas) deployed in remote locations with solar/battery power. IC Role / Device Role / Timing Role: High-speed channel multiplexed ADC acquiring synchronized sensor readings; serial interface minimizes GPIO count on low-pin-count MCU. Use Value: ±2.5V input range accommodates unconditioned thermocouple outputs; no-missing-codes guarantee prevents false alarms in safety-critical logging. |
| DSP-Based Digital Signal Processing | Wireless Communication Front-End |
Use Scenario: Low-latency sensor fusion in industrial motion controllers using TI C54x DSPs with buffered serial ports. IC Role / Device Role / Timing Role: Synchronous serial ADC interfaced to BSP with CONV→BFSX, CLK→BCLKX, DATA→BDR - zero software overhead data capture. Use Value: MSB-first two's complement output aligns with DSP native data format; 1.625µs conversion time enables tight control loop timing budgets. |
Use Scenario: IF sampling in narrowband IoT transceivers (e.g., LoRa, NB-IoT) requiring low-power, high-SFDR digitization of filtered baseband signals. IC Role / Device Role / Timing Role: Digitizing demodulated analog waveforms prior to digital filtering and packet decoding; internal reference stabilizes gain across operating temperature. Use Value: 75dB SFDR at 10kHz suppresses spurious tones that could corrupt packet reception; 30ps aperture jitter preserves EVM in QPSK-modulated signals. |
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/250 | Improved grade: ±1LSB INL/DNL vs ±2LSB for ADS7835E/250G4; same package, pinout, and timing. | Required for metrology-grade calibration equipment where <0.025% linearity error is mandatory. | Select ADS7835EB/250 only when tighter linearity specs are validated in final system testing - no PCB change needed. |
| MAX11131AUT+T | 12-bit, 500ksps SAR ADC with internal reference; differs in serial protocol (SPI-only), no LSB-first mode, and 2.048V reference. | Suitable for new designs targeting Maxim's ecosystem; requires firmware adaptation for clock/data handshaking logic. | Choose MAX11131AUT+T when leveraging Maxim's support tools or when 2.048V reference simplifies scaling with 3.3V logic interfaces. |
Compared with ADS7835EB/250, the ADS7835E/250G4 trades 1LSB linearity for lower cost in non-critical measurement roles; versus MAX11131AUT+T, it offers greater interface flexibility (asynchronous CONV, LSB-first option) but requires 5V supply and external 0.1µF/2.2µF VREF bypassing.
Availability
ADS7835E/250G4 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data acquisition, and DSP-based signal processing requiring stable component supply across extended production lifecycles.
Supply support for ADS7835E/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 acquired Burr-Brown in 2000 and maintains legacy precision analog product lines including high-performance data converters.
The ADS7835E/250G4 belongs to TI's legacy SAR ADC portfolio designed for portable, low-power, high-accuracy measurement systems where integration of reference and serial interface reduces system-level complexity.
FAQ
What is the absolute maximum input voltage rating for the ADS7835E/250G4 analog input pin?
The ADS7835E/250G4 AIN pin has an absolute maximum rating of –5.3V to +5.3V when operated with a +5V supply. Exceeding this range risks permanent damage to the internal 2kΩ–2kΩ input divider and CDAC structure. For reliable operation, maintain input signals within the specified ±2.5V range when using the internal reference, or ±VREF when using an external reference between 2.3V and 2.9V.
Does the ADS7835E/250G4 require external decoupling capacitors, and if so, what values are mandatory?
Yes, the ADS7835E/250G4 requires specific decoupling: a 0.1µF ceramic capacitor placed as close as possible to the VREF pin (with optional 2.2µF tantalum in parallel), and a 0.1µF ceramic + 10µF tantalum pair on the +VCC pin. These values are mandated by the datasheet to suppress reference noise and supply ripple - omitting them degrades SNR by up to 10dB and increases full-scale error drift.
Can the ADS7835E/250G4 interface directly with a 3.3V microcontroller SPI bus without level shifting?
No, the ADS7835E/250G4 is a 5V-only device: its digital inputs require VIH ≥3.0V (with +5V supply), but VOL = 0.4V and VOH = 3.5V are incompatible with 3.3V logic thresholds. Direct connection risks unreliable DATA sampling and potential latch-up. A bidirectional level shifter or 5V-tolerant MCU GPIO is required for safe interoperability.
How does the power-down mode of the ADS7835E/250G4 affect conversion latency and accuracy?
The ADS7835E/250G4 power-down mode introduces no conversion penalty: the first conversion after exiting power-down is fully valid and meets all specifications. However, CONV must remain HIGH for ≥350ns (acquisition time) before the next conversion starts to ensure proper internal node charging. Accuracy remains unchanged - only quiescent current drops from 3.5mA to 0.5mA.
Is the ADS7835E/250G4 pin-compatible with the ADS7835P (DIP-8) variant?
No, the ADS7835E/250G4 (MSOP-8) and ADS7835P (DIP-8) share identical pin functions but differ in physical layout, thermal characteristics, and package dimensions. While signal mapping matches (e.g., Pin 1 = VREF in both), the MSOP-8's 0.65mm pitch and 3mm × 3mm footprint require distinct PCB land patterns and reflow profiles - direct substitution without board revision is not feasible.
ADS7835E/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:
- Discontinued at Digi-Key
- 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/250G4 FAQ
1.How can I place an order for ADS7835E/250G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7835E/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 ADS7835E/250G4 reliable?
The price and inventory of ADS7835E/250G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7835E/250G4 is usually 5 days.
3.What payment methods are accepted for ADS7835E/250G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7835E/250G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7835E/250G4?
ADS7835E/250G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7835E/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 ADS7835E/250G4?
For technical support, including ADS7835E/250G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7835E/250G4 requirements.
6.How does Aetrix verify that ADS7835E/250G4 is sourced from the original manufacturer or authorized distributors?
All ADS7835E/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 ADS7835E/250G4 meets industry standards.
7.What is the process for return or replacement of ADS7835E/250G4?
All ADS7835E/250G4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7835E/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 ADS7835E/250G4 part is unused and in its original packaging.
Return procedure for ADS7835E/250G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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