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Texas Instruments ADS7953SDBTR
- Part No.:
- ADS7953SDBTR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7953SDBTR.pdf
- Description:
- IC ADC 12BIT SAR 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,637
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Product details
Overview
ADS7953SDBTR from Texas Instruments is a 12-bit, 16-channel, single-ended SAR analog-to-digital converter with 1-MSPS sample rate, zero-latency operation, and dual programmable alarm thresholds per channel. It operates from 2.7 V to 5.25 V analog supply and supports 0 to VREF or 0 to 2×VREF input ranges. Used in PLC analog input modules for real-time sensor monitoring.
For engineers reviewing the ADS7953SDBTR datasheet, ADS7953SDBTR pinout, ADS7953SDBTR application, or ADS7953SDBTR equivalent, key selection criteria include channel count (16), resolution (12-bit), serial interface timing (20-MHz SCLK), GPIO configurability (4 pins), and alarm threshold programmability per channel.
Technical Context
The ADS7953SDBTR integrates a capacitor-based SAR ADC with inherent sample-and-hold, sampling on the falling edge of CS. Its auto-sequencing mode cycles through preselected channels without host intervention, while manual mode allows per-conversion channel selection via SDI commands.
It features four individually configurable GPIOs (GPIO0–GPIO3) in the TSSOP package - supporting alarm outputs (high/low), range selection, and power-down control - and uses a 3-wire SPI-compatible interface (CS, SCLK, SDI/SDO) with independent I/O supply (+VBD) ranging from 1.7 V to 5.25 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step for precision sensor digitization. |
| Sample Rate | 1 MSPS - enables capture of signals up to ~47 MHz input bandwidth (3 dB point) without aliasing in high-speed monitoring. |
| Input Channels | 16 single-ended - supports dense analog front-end consolidation in industrial I/O modules. |
| Input Ranges | 0 to VREF or 0 to 2×VREF - software-selectable per conversion to optimize dynamic range for varying signal amplitudes. |
| Alarm Function | Two per channel - independently programmable high/low thresholds enable autonomous over-range detection without CPU polling. |
| Power Dissipation | 14.5 mW at 1 MSPS (+VA = 5 V, +VBD = 3 V) - suitable for thermally constrained embedded systems and isolated power domains. |
| Power-Down Current | 1 µA - reduces system standby power in battery-backed or energy-sensitive applications. |
Pinout & Package
ADS7953SDBTR is packaged in a 38-pin TSSOP (DBT) with nominal body size 9.70 mm × 4.40 mm. All pins are electrically validated per TI SLAS605C Rev C datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH15 | Analog input | 16 single-ended analog input channels routed to internal multiplexer; CH0–CH7 assigned to pins 28–21 (TSSOP), CH8–CH15 to pins 18–11. |
| AINP / AINM | Differential analog input | Optional pseudo-differential input path; AINP accepts signal, AINM serves as reference return (not used in single-ended mode). |
| MXO | Analog output | Multiplexer output - provides buffered access to selected channel's analog signal before ADC sampling. |
| REFP / REFM | Analog reference | High-impedance reference inputs accepting external voltage (e.g., REF5025); REFP = VREF, REFM = reference ground. |
| CS / SCLK / SDI / SDO | Digital interface | 4-wire SPI-compatible interface; CS active-low enables conversion start and frame synchronization. |
| GPIO0–GPIO3 | Configurable I/O | Four bidirectional pins: GPIO0 = alarm output, GPIO1 = low-alarm output, GPIO2 = range select, GPIO3 = power-down input. |
| +VA / AGND | Analog supply | +VA powers analog circuitry (2.7–5.25 V); AGND is dedicated analog ground plane - must be separated from digital ground. |
| +VBD / BDGND | Digital I/O supply | +VBD sets logic threshold for CS/SCLK/SDI/SDO/GPIO (1.7–5.25 V); enables glueless interfacing with diverse host voltages. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-latency conversion | Eliminates pipeline delay - output data corresponds exactly to sampled input edge, critical for closed-loop control timing. |
| Auto-sequencing mode | Hardware-managed channel cycling reduces host processor overhead and ensures deterministic scan intervals. |
| Per-channel alarm thresholds | Two independent voltage thresholds per channel trigger GPIO outputs - enables distributed fault detection without firmware intervention. |
| Wide I/O supply range | 1.7 V to 5.25 V on +VBD allows direct connection to 1.8-V, 3.3-V, or 5-V microcontrollers without level shifters. |
| Low-power power-down mode | 1 µA quiescent current extends battery life in portable instrumentation and reduces thermal load in sealed enclosures. |
Applications
| PLC Analog Input Module | Optical Line Card Monitoring |
|---|---|
|
Use Scenario: Digitizing 16 temperature, pressure, and current loop signals in a modular industrial controller rack. IC Role / Device Role / Timing Role: Primary ADC managing all analog acquisition; zero-latency output synchronizes with real-time OS task deadlines. Use Value: 16-channel integration reduces component count vs. multiple 4-channel ADCs; auto-sequencing ensures consistent 62.5 ns inter-channel timing. |
Use Scenario: Monitoring bias currents and photodiode outputs across 16 transceiver lanes in telecom line cards. IC Role / Device Role / Timing Role: High-speed signal monitor feeding FPGA-based health analytics; alarms flag out-of-spec conditions within one conversion cycle. Use Value: Dual per-channel alarms eliminate FPGA polling overhead; 1-MSPS rate captures transient faults missed by slower converters. |
| Medical Patient Monitor Front-End | Digital Power Supply Telemetry |
|
Use Scenario: Acquiring ECG, respiration, and SpO₂ sensor outputs in portable diagnostic equipment. IC Role / Device Role / Timing Role: Signal conditioning and digitization stage; low 14.5 mW power enables extended battery runtime. Use Value: 12-bit resolution preserves clinical-grade SNR; wide analog supply (2.7–5.25 V) accommodates aging battery voltage sag. |
Use Scenario: Measuring rail voltages, phase currents, and thermal sensors in multi-phase DC-DC controllers. IC Role / Device Role / Timing Role: Telemetry ADC feeding digital power management IC; GPIO-triggered alarms initiate immediate fault response. Use Value: Programmable 0–VREF / 0–2×VREF ranges match diverse sensor outputs (e.g., shunt amps, thermistors); 1 µA power-down minimizes idle loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7952SDBT | 12-bit, 12-channel variant in same 38-pin TSSOP package; identical timing, GPIO, and alarm architecture. | Fewer channels reduce PCB routing complexity where <12 inputs are required; same footprint enables drop-in substitution. | Select when system requires ≤12 analog inputs and board space optimization is prioritized over future expansion headroom. |
| ADS8688IPWR | 16-bit, 8-channel SAR ADC with integrated PGA and reference; 500 kSPS max; different SPI protocol and no per-channel alarms. | Higher resolution suits precision measurement; lacks dual alarms and auto-sequencing - requires host-driven channel management. | Choose for applications demanding >12-bit accuracy and built-in gain flexibility, accepting trade-offs in speed, alarm autonomy, and channel count. |
Compared with ADS7952SDBT, ADS7953SDBTR offers 4 additional channels without layout change; versus ADS8688IPWR, it trades resolution and PGA for higher speed, alarm autonomy, and channel density - making it optimal for real-time industrial monitoring where latency and fault response are critical.
Availability
ADS7953SDBTR is available at Aetrix Electronics and suitable for PLC/IPC systems, optical line card monitoring, medical instrumentation, digital power supplies, and high-speed closed-loop systems requiring stable component supply and long-term manufacturability.
Supply support for ADS7953SDBTR 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 and embedded processing technologies, with decades of expertise in precision data converters and industrial interface solutions.
The ADS79xx family was designed specifically for high-channel-count, real-time industrial data acquisition - emphasizing zero-latency conversion, autonomous alarm generation, and flexible power supply operation in harsh environments.
FAQ
What is the maximum clock frequency supported by the ADS7953SDBTR serial interface?
The ADS7953SDBTR supports a 20-MHz SCLK frequency, enabling full 12-bit data transfer within the 1-MSPS conversion window. This timing allows reliable communication with modern microcontrollers and FPGAs without requiring wait states. The ADS7953SDBTR datasheet specifies setup/hold requirements relative to SCLK edges to ensure robust data capture at this rate.
Does the ADS7953SDBTR require an external reference voltage?
Yes, the ADS7953SDBTR 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 VREF stability directly affecting total unadjusted error. The ADS7953SDBTR supports input ranges of 0 to VREF or 0 to 2×VREF depending on GPIO2 state.
How many GPIOs does the ADS7953SDBTR provide, and what functions do they serve?
The ADS7953SDBTR provides four GPIOs (GPIO0–GPIO3) in its 38-pin TSSOP package. GPIO0 outputs high-alarm status, GPIO1 outputs low-alarm status, GPIO2 selects input range (0 = 0–VREF, 1 = 0–2×VREF), and GPIO3 serves as active-low power-down control. All are software-configurable via register writes over the serial interface.
Can the ADS7953SDBTR perform automatic channel sequencing without host intervention?
Yes, the ADS7953SDBTR supports auto-sequencing modes (Auto-1 and Auto-2) that cycle through user-defined channel lists without host command between conversions. Once configured via SDI, the device autonomously advances the channel pointer and initiates sampling on each CS falling edge - reducing host CPU load in continuous monitoring applications using the ADS7953SDBTR.
What is the absolute input voltage range for the ADS7953SDBTR analog inputs?
The ADS7953SDBTR analog inputs (CH0–CH15, AINP) accept voltages from 0 V to VREF (Range 1) or 0 V to 2×VREF (Range 2), depending on GPIO2 state. The absolute maximum rating is –0.3 V to +VA + 0.3 V. Exceeding these ranges risks damage or erroneous conversion; input protection diodes clamp to AGND and +VA rails.
ADS7953SDBTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 16
- 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:
- 38-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7953SDBTR FAQ
1.How can I place an order for ADS7953SDBTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7953SDBTR 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 ADS7953SDBTR reliable?
The price and inventory of ADS7953SDBTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7953SDBTR is usually 5 days.
3.What payment methods are accepted for ADS7953SDBTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7953SDBTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7953SDBTR?
ADS7953SDBTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7953SDBTR 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 ADS7953SDBTR?
For technical support, including ADS7953SDBTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7953SDBTR requirements.
6.How does Aetrix verify that ADS7953SDBTR is sourced from the original manufacturer or authorized distributors?
All ADS7953SDBTR 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 ADS7953SDBTR meets industry standards.
7.What is the process for return or replacement of ADS7953SDBTR?
All ADS7953SDBTR units undergo pre-shipment inspection (PSI). If there is an issue with ADS7953SDBTR, 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 ADS7953SDBTR part is unused and in its original packaging.
Return procedure for ADS7953SDBTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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