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Texas Instruments ADS7835EB/250
- Part No.:
- ADS7835EB/250
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7835EB/250.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:257
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Product details
Overview
ADS7835EB/250 from Burr-Brown (now Texas Instruments) is a 12-bit, 500kHz sampling 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 ADS7835EB/250 datasheet, ADS7835EB/250 pinout, ADS7835EB/250 application, or ADS7835EB/250 equivalent, key selection considerations include guaranteed no-missing-codes performance, ±1 LSB integral linearity (high-grade variant), power-down mode reducing dissipation to 2.5mW, and MSOP-8 package compatibility with space-constrained signal acquisition designs.
Technical Context
The ADS7835EB/250 implements a capacitive redistribution SAR architecture fabricated in 0.6µm CMOS, enabling true bipolar input operation via an internal 2kΩ–2kΩ voltage divider referenced to the 2.5V bandgap. Its conversion timing is asynchronous to CLK - sample/hold transitions are controlled solely by the falling edge of CONV, decoupling analog control from clock domain constraints.
It supports two serial output formats: MSB-first (default) and LSB-first (enabled by specific CONV timing during the 13th clock cycle), both synchronized to CLK. The internal reference can be overdriven by an external 2.3V–2.9V source, and the VREF pin includes a 10kΩ series resistor (±30%) enabling stable external reference injection without loading the internal buffer.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with guaranteed no missing codes - ensures monotonicity and full code coverage across –40°C to +85°C. |
| Throughput Rate | 500kHz maximum - enables real-time acquisition of signals up to ~200kHz (Nyquist-limited) with 1.625µs conversion time. |
| Input Range | ±2.5V bipolar (with internal reference) - accepts inputs below ground; compatible with differential sensor outputs and AC-coupled sources. |
| Integral Linearity | ±1 LSB max - high-grade specification (ADS7835EB) reduces gain error impact on precision measurement systems. |
| Power Dissipation | 17.5mW typical at 500kHz; drops to 2.5mW in power-down - critical for extended battery life in portable instrumentation. |
| Reference | Internal 2.5V ±0.025V (2.475V–2.525V) - provides stable full-scale calibration without external components; supports external override. |
| SNR | 72dB at 10kHz input - sufficient for 11.6 effective bits (ENOB), supporting medium-fidelity signal digitization. |
Pinout & Package
ADS7835EB/250 is housed in an MSOP-8 (337 drawing) package - 3mm × 3mm, 0.65mm pitch, thermally enhanced with dual GND pins for low-noise analog grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference output/buffered reference input | Provides or accepts 2.3V–2.9V reference; requires 0.1µF ceramic + 2.2µF tantalum bypass to suppress SAR-induced glitches. |
| AIN (Pin 2) | Analog input | ±2.5V bipolar input node; internally biased via 2kΩ–2kΩ divider - sourcing up to 1.25mA at –FS; requires external buffering for low-impedance drive. |
| GND (Pin 3) | Analog ground | Primary analog return path; must be star-connected to minimize noise coupling into sensitive S/H and CDAC circuitry. |
| GND (Pin 4) | Digital ground | Separate digital return for CONV, CLK, DATA; tied to Pin 3 at single point to avoid ground loops while isolating digital switching noise. |
| CONV (Pin 5) | Convert control | Asynchronous master control: falling edge initiates hold mode and conversion start; timing relative to CLK determines LSB-first mode or power-down entry. |
| DATA (Pin 6) | Serial data output | Three-state CMOS output; transmits 12-bit two's complement result MSB-first (or LSB-first); enters high-Z when CONV goes low mid-conversion. |
| CLK (Pin 7) | Serial clock input | Accepts 200kHz–8MHz clock; duty cycle insensitive if tCKH/tCKL ≥ 50ns; defines conversion speed and serial bit rate (16 clocks/conversion). |
| +VCC (Pin 8) | Power supply | +5V ±5% supply; requires 0.1µF ceramic + 10µF tantalum local decoupling to sustain transient current demands during conversion. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed no missing codes | Ensures monotonic transfer function across full temperature range - eliminates ambiguity in control loop feedback or threshold detection. |
| Asynchronous CONV control | Enables deterministic sample initiation independent of clock domain - simplifies trigger-synchronized acquisition in mixed-signal systems. |
| LSB-first serial option | Reduces software overhead in microcontrollers lacking MSB-first SPI support - avoids bit-reversal in firmware for direct register alignment. |
| Bipolar input with single supply | Eliminates need for dual-rail supplies or level-shifting circuitry - lowers BOM cost and PCB area in portable 5V systems. |
| Low-power power-down mode | Reduces quiescent current to 0.5mA (2.5mW) between conversions - extends battery runtime in intermittent-sampling applications like environmental monitors. |
Applications
| Portable Spectrum Analyzers | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Real-time RF spectral analysis in handheld field test equipment with limited thermal headroom and battery capacity. IC Role / Device Role / Timing Role: Primary ADC capturing baseband I/Q samples at up to 500kHz; internal reference ensures consistent full-scale calibration across temperature swings. Use Value: 72dB SNR and ±1 LSB linearity preserve dynamic range for detecting weak signals adjacent to strong interferers; 2.5mW power-down extends field operation beyond 8 hours on Li-ion. |
Use Scenario: Multi-channel environmental monitoring (temperature, pressure, humidity) deployed in remote locations with solar/battery power. IC Role / Device Role / Timing Role: High-precision analog front-end digitizer interfaced to low-power MCU via SPI; CONV pin enables wake-on-event sampling. Use Value: Bipolar input accommodates offset-tolerant sensor outputs; no-missing-codes guarantee prevents data gaps in long-term trend logging; MSOP-8 footprint minimizes PCB size for compact enclosures. |
| DSP-Based Signal Processing | Wireless Communication Receivers |
Use Scenario: Digitizing analog IF or baseband signals in embedded DSP platforms (e.g., TI C54x) requiring low-latency, deterministic sampling. IC Role / Device Role / Timing Role: Synchronous serial ADC tightly coupled to DSP's buffered serial port (BSP); CLK and CONV mapped to BCLKX and BFSX for hardware-triggered capture. Use Value: Asynchronous CONV-to-CLK timing allows precise alignment of sample windows with DSP frame boundaries; 1.625µs conversion enables sub-microsecond latency for closed-loop control. |
Use Scenario: Intermediate-frequency digitization in narrowband wireless receivers (e.g., ISM-band telemetry, RFID readers) operating under strict power budgets. IC Role / Device Role / Timing Role: High-speed, low-noise ADC converting filtered IF signals prior to digital demodulation; internal 2.5V reference eliminates external ref IC and associated noise sources. Use Value: 68dB SINAD at 10kHz supports >10-bit ENOB for reliable symbol decoding; ±2.5V input range matches common IF amplifier output swing without attenuation. |
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/250 | ±2 LSB integral linearity (vs. ±1 LSB for ADS7835EB/250); otherwise identical architecture, pinout, and timing. | Suitable for cost-sensitive industrial data acquisition where ±2 LSB INL meets system accuracy requirements. | Select ADS7835E/250 when budget constraints outweigh need for highest linearity grade; same PCB layout and firmware. |
| ADS8320EB/250 | 16-bit resolution, 100kSPS max, SPI-compatible interface, 3.3V-only supply; no internal reference - requires external REF3025. | Targeted at higher-precision, lower-throughput applications (e.g., precision sensor conditioning) where resolution > speed. | Choose ADS8320EB/250 only when 16-bit resolution is mandatory and throughput ≤100kSPS suffices; requires redesign of reference and power domains. |
Compared with ADS7835E/250, the ADS7835EB/250 delivers tighter linearity for metrology-grade measurements without layout or interface changes; versus ADS8320EB/250, it trades resolution for 5× higher throughput and integrated reference - making it optimal for bandwidth-constrained portable instrumentation.
Availability
ADS7835EB/250 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data acquisition, and wireless receiver front-ends requiring stable component supply, long-lifecycle availability, and guaranteed no-missing-codes performance.
Supply support for ADS7835EB/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
Burr-Brown Corporation, acquired by Texas Instruments in 2000, specialized in precision analog ICs including data converters, amplifiers, and references - known for high-accuracy, low-noise signal chain solutions.
The ADS7835EB/250 belongs to Burr-Brown's high-speed, low-power SAR ADC product line, designed specifically for portable and remote measurement systems demanding precision, small size, and single-supply operation.
FAQ
What is the guaranteed integral linearity specification for ADS7835EB/250?
The ADS7835EB/250 guarantees ±1 LSB integral linearity over the full –40°C to +85°C temperature range, as confirmed in the "PACKAGE/ORDERING INFORMATION" table on page 3 of the datasheet. This distinguishes it from the ADS7835E/250 variant, which specifies ±2 LSB. The ±1 LSB rating directly supports applications requiring high code-to-code consistency, such as precision waveform reconstruction or calibrated sensor readouts, without post-fabrication calibration.
Does ADS7835EB/250 require an external reference, or can it operate with its internal reference?
The ADS7835EB/250 can operate fully with its internal 2.5V bandgap reference, delivering a ±2.5V analog input range. The internal reference is buffered and specified to 2.475V–2.525V at zero load. External reference is optional and supported via the VREF pin (2.3V–2.9V range), useful when improved temperature stability or custom full-scale ranges are needed. No external reference is required for basic operation of ADS7835EB/250.
How does the power-down mode function in ADS7835EB/250, and what is its timing requirement?
ADS7835EB/250 enters power-down mode when CONV remains LOW during conversion and stays LOW at the start of the 13th clock cycle - reducing supply current to 0.5mA (2.5mW). It exits power-down on the rising edge of CONV, requiring ≥tACQ (350ns) high time before sampling. This mode incurs no conversion penalty: the first result after wake-up is valid, making it ideal for burst-mode acquisition in ADS7835EB/250-based systems.
Is ADS7835EB/250 compatible with standard SPI interfaces, and how is LSB-first mode enabled?
ADS7835EB/250 supports SPI-like operation but is not a drop-in SPI peripheral - it uses asynchronous CONV for framing instead of chip select. LSB-first mode is enabled by pulling CONV HIGH during conversion (before the 12th clock) and then LOW during the 13th clock cycle (while D0 is active), causing the next 11 bits to repeat LSB-first. This avoids firmware bit reversal and aligns with certain microcontroller register conventions in ADS7835EB/250 implementations.
What are the absolute maximum ratings for analog input voltage on ADS7835EB/250?
The absolute maximum analog input voltage for ADS7835EB/250 is –5.3V to +5.3V (relative to GND) when operated from a +5V supply, as stated in the "ABSOLUTE MAXIMUM RATINGS" table on page 3. Exceeding this range risks permanent damage. For normal operation with the internal 2.5V reference, the specified input range is ±2.5V - staying within ±2.5V ensures guaranteed performance and avoids clipping or distortion in ADS7835EB/250 signal paths.
ADS7835EB/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:
- 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:
- -
ADS7835EB/250 FAQ
1.How can I place an order for ADS7835EB/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7835EB/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 ADS7835EB/250 reliable?
The price and inventory of ADS7835EB/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7835EB/250 is usually 5 days.
3.What payment methods are accepted for ADS7835EB/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7835EB/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7835EB/250?
ADS7835EB/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7835EB/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 ADS7835EB/250?
For technical support, including ADS7835EB/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7835EB/250 requirements.
6.How does Aetrix verify that ADS7835EB/250 is sourced from the original manufacturer or authorized distributors?
All ADS7835EB/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 ADS7835EB/250 meets industry standards.
7.What is the process for return or replacement of ADS7835EB/250?
All ADS7835EB/250 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7835EB/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 ADS7835EB/250 part is unused and in its original packaging.
Return procedure for ADS7835EB/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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