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Texas Instruments ADS7959SDBT
- Part No.:
- ADS7959SDBT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 30-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7959SDBT.pdf
- Description:
- IC ADC 8BIT SAR 30TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,121
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Product details
Overview
ADS7959SDBT from Texas Instruments is an 8-bit, 8-channel, single-ended, serial-interface SAR ADC with 1-MSPS sample rate, zero-latency operation, and two software-selectable unipolar input ranges (0 to VREF and 0 to 2×VREF). It integrates a high-input-impedance PGA or non-inverting buffer interface, four programmable GPIOs, and dual per-channel alarm thresholds - deployed in PLC analog input modules and digital power supply monitoring systems.
For engineers reviewing the ADS7959SDBT datasheet, ADS7959SDBT pinout, ADS7959SDBT application, or ADS7959SDBT equivalent, key selection criteria include its TSSOP-30 package compatibility, 20-MHz SPI interface timing, 14.5-mW active power at 1 MSPS, 1-μA power-down current, and support for auto/manual channel sequencing in multi-sensor acquisition.
Technical Context
The ADS7959SDBT implements a capacitor-based SAR architecture with inherent sample-and-hold, sampling on the falling edge of CS and using SCLK for conversion control and serial data transfer. Its analog front-end accepts 2.7–5.25 V supply and supports flexible reference configurations via REFP/REFM pins.
It operates in Auto-1, Auto-2, or Manual mode for channel selection, with GPIO0–GPIO3 individually configurable as inputs, outputs, or dedicated alarm/control functions (e.g., PD, Range, Low-alarm, High-alarm). The device delivers 47-MHz input bandwidth and supports glueless interfacing with microcontrollers across 1.7–5.25 V I/O supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - Enables cost-optimized, medium-speed monitoring where 256-level quantization suffices (e.g., voltage/current supervision in DC-DC converters). |
| Sample Rate | 1 MSPS - Supports real-time closed-loop response in high-speed power supply feedback and motor phase current sampling. |
| Analog Supply | 2.7 V to 5.25 V - Allows direct operation from common industrial rails (3.3 V, 5 V) without LDO regulation overhead. |
| I/O Supply Range | 1.7 V to 5.25 V - Permits seamless SPI interfacing with low-voltage MCUs (1.8 V) or legacy 3.3/5 V controllers without level shifters. |
| Input Ranges | 0 to VREF and 0 to 2×VREF - Dual-range flexibility accommodates both precision (e.g., ±2.5 V via REF5025) and extended dynamic range sensing. |
| Power Dissipation | 14.5 mW at 1 MSPS (+VA = 5 V, +VBD = 3 V) - Enables thermally constrained designs such as dense I/O modules and optical line cards. |
| Power-Down Current | 1 μA - Facilitates ultra-low-power sleep states during idle periods in battery-backed or energy-harvested sensor nodes. |
Pinout & Package
ADS7959SDBT is housed in a 30-pin TSSOP (DBT) package measuring 7.80 mm × 4.40 mm, with exposed thermal pad (not electrically connected), RoHS-compliant lead finish, and moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH3 | Analog input | Four of eight single-ended analog input channels; routed to internal multiplexer for sequential or manual sampling. |
| MXO | Analog output | Multiplexer output - connects selected channel to AINP for conversion; requires external buffering if driving high-Z sources. |
| AINP / AINM | Analog input | Differential input pair for buffered or unbuffered signal acquisition; AINM tied to AGND for single-ended use. |
| REFP / REFM | Analog reference | High-precision reference input and ground - accepts external reference (e.g., REF5025) or internal VREF-derived bias. |
| CS / SCLK / SDI / SDO | Digital interface | Standard 4-wire SPI interface with active-low chip select; supports 20-MHz clock for minimal conversion latency. |
| GPIO0–GPIO3 | Configurable I/O | Four bidirectional pins supporting alarm outputs (High/Low), range selection (Range), and power-down control (PD) - programmable via register writes. |
| +VA / AGND | Analog supply | Primary analog power domain (2.7–5.25 V); AGND pins must be star-connected to minimize noise coupling into SAR core. |
| +VBD / BDGND | Digital supply | Independent I/O rail (1.7–5.25 V); decoupling near BDGND reduces digital switching noise affecting conversion accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-latency conversion | Eliminates pipeline delay - critical for real-time overvoltage/overcurrent fault detection in power electronics. |
| Two per-channel alarm thresholds | Enables autonomous high/low limit checking without host CPU intervention - reduces firmware load in PLC scan cycles. |
| Auto-sequencing modes (Auto-1/Auto-2) | Hardware-managed channel scanning - simplifies firmware by offloading sequence state machine to silicon. |
| 47-MHz input bandwidth | Supports accurate digitization of fast transients (e.g., switch-node ringing in GaN FETs) without external anti-alias filtering. |
| Glueless MCU interface | 1.7–5.25 V I/O compatibility enables direct connection to ARM Cortex-M, C2000, or RISC-V hosts - no level-shifter BOM cost. |
Applications
| PLC Analog Input Module | Digital Power Supply Monitoring |
|---|---|
Use Scenario: Simultaneous monitoring of 8 voltage/current rails in modular industrial I/O chassis with cycle-time constraints. IC Role / Device Role / Timing Role: Primary 8-channel ADC performing synchronized sampling under Auto-1 mode; alarms trigger immediate interrupt to host controller. Use Value: Reduces host polling overhead and enables deterministic <100-μs fault response - meeting IEC 61131-3 scan cycle requirements. | Use Scenario: Real-time telemetry of output voltage, inductor current, temperature, and fan speed in server-grade VRMs. IC Role / Device Role / Timing Role: Dedicated monitoring ADC interfaced to PMBus host; MXO-driven PGA buffers high-impedance sense points. Use Value: 1-MSPS throughput captures transient droop/surge events; dual alarm thresholds flag out-of-spec conditions before protection circuits activate. |
| Optical Line Card Supervision | Medical Patient Monitor Front-End |
Use Scenario: Bias current and photodiode voltage monitoring across multiple laser diodes and receivers in telecom line cards. IC Role / Device Role / Timing Role: Multi-channel acquisition engine with GPIO-controlled range switching - adapts to varying photodiode responsivity and TIA gain settings. Use Value: 0–2×VREF range handles wide dynamic input (nA–mA photocurrents); 1-μA power-down extends shelf life in hot-swap modules. | Use Scenario: Acquisition of ECG leads, SpO₂ photodiode signals, and temperature sensors in portable bedside monitors. IC Role / Device Role / Timing Role: Low-noise, isolated ADC subsystem - AINP/AINM used differentially for ECG; GPIOs drive LED drivers for SpO₂ LEDs. Use Value: High input impedance minimizes loading on passive RC filters; 14.5-mW dissipation avoids thermal drift in compact enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7953SDBT | 12-bit resolution, 16-channel, same 30-pin TSSOP footprint - higher precision but lower channel count density. | Used where >8-bit ENOB required for sensor calibration or high-fidelity waveform capture. | Select when system SNR budget demands ≥70 dB, not when cost or firmware simplicity favors 8-bit quantization. |
| ADS7951SDBT | 10-bit resolution, 8-channel, identical pinout and timing - intermediate performance between ADS7959 and ADS7953. | Preferred in mixed-signal systems needing better than 8-bit linearity but less than full 12-bit overhead. | Choose for upgrade path from ADS7959 where THD or DNL specs become limiting in closed-loop control loops. |
Compared with ADS7959SDBT, ADS7953SDBT trades channel count for resolution and dynamic range, while ADS7951SDBT offers balanced improvement in ENOB without layout change - all three share identical GPIO configuration, alarm logic, and SPI protocol stack.
Availability
ADS7959SDBT is available at Aetrix Electronics and suitable for PLC analog input modules, digital power supply telemetry, and optical line card supervision requiring stable component supply across long-lifecycle industrial programs.
Supply support for ADS7959SDBT 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 - serving industrial, automotive, and communications markets with high-reliability components.
The ADS79xx family was designed specifically for high-speed, multi-channel data acquisition in space-constrained, noise-sensitive industrial environments - emphasizing low power, flexible interfacing, and autonomous alarm handling.
FAQ
What is the maximum supported SCLK frequency for ADS7959SDBT?
The ADS7959SDBT supports up to 20 MHz SCLK frequency, enabling minimum conversion time of 1 µs per sample at full 1-MSPS rate. This timing is validated across the full operating temperature range (–40°C to +125°C) and ensures reliable SPI communication with standard microcontrollers without setup/hold violations.
Does ADS7959SDBT require an external reference voltage?
Yes, ADS7959SDBT requires an external reference applied to REFP and REFM pins. It does not include an internal reference. Common choices include the REF5025 (2.5 V) or REF5045 (4.5 V), with input impedance >10 MΩ ensuring minimal loading error during conversion.
How many analog input channels does ADS7959SDBT support?
ADS7959SDBT supports 8 single-ended analog input channels (CH0–CH7), as confirmed in the device comparison table and pin function listing for the DBT package. All 8 channels are accessible in the 30-pin TSSOP variant and selectable via auto-sequencing or manual register writes.
Can ADS7959SDBT operate with separate analog and digital supplies?
Yes, ADS7959SDBT uses independent analog (+VA, AGND) and digital I/O (+VBD, BDGND) supply domains. +VA ranges from 2.7 V to 5.25 V for the SAR core and reference circuitry, while +VBD supports 1.7 V to 5.25 V - allowing isolation or voltage translation between domains to suppress digital noise coupling.
What GPIO functions are available on ADS7959SDBT?
ADS7959SDBT provides four GPIOs (GPIO0–GPIO3) in the TSSOP-30 package, configurable as general-purpose I/O or dedicated functions: PD (active-low power-down), Range (input range selection), Low-alarm, and High-alarm (both active-high outputs). Configuration is performed via internal control registers accessed over SPI.
ADS7959SDBT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 30-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 1.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 30-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7959SDBT FAQ
1.How can I place an order for ADS7959SDBT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7959SDBT 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 ADS7959SDBT reliable?
The price and inventory of ADS7959SDBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7959SDBT is usually 5 days.
3.What payment methods are accepted for ADS7959SDBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7959SDBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7959SDBT?
ADS7959SDBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7959SDBT 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 ADS7959SDBT?
For technical support, including ADS7959SDBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7959SDBT requirements.
6.How does Aetrix verify that ADS7959SDBT is sourced from the original manufacturer or authorized distributors?
All ADS7959SDBT 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 ADS7959SDBT meets industry standards.
7.What is the process for return or replacement of ADS7959SDBT?
All ADS7959SDBT units undergo pre-shipment inspection (PSI). If there is an issue with ADS7959SDBT, 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 ADS7959SDBT part is unused and in its original packaging.
Return procedure for ADS7959SDBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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