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Texas Instruments ADS7953SBDBTG4
- Part No.:
- ADS7953SBDBTG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7953SBDBTG4.pdf
- Description:
- IC ADC 12BIT SAR 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,221
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Product details
Overview
ADS7953SBDBTG4 from Texas Instruments is a 12-bit, 16-channel, single-ended SAR analog-to-digital converter with 1-MSPS sampling rate, zero-latency operation, and dual programmable alarm thresholds per channel. It features a 20-MHz serial interface, 2.7–5.25-V analog supply range, and four configurable GPIOs in its 38-pin TSSOP package. It is used in industrial PLC signal monitoring where multichannel precision timing and alarm-triggered event capture are required.
For engineers reviewing the ADS7953SBDBTG4 datasheet, ADS7953SBDBTG4 pinout, ADS7953SBDBTG4 application, or ADS7953SBDBTG4 equivalent, key selection criteria include channel count (16), resolution (12-bit), sample rate (1 MSPS), alarm threshold configurability, and TSSOP-38 package compatibility with isolated power-supply systems.
Technical Context
The ADS7953SBDBTG4 implements a capacitor-based SAR architecture with integrated sample-and-hold, supporting both auto-sequenced and manual channel selection modes. Its serial interface uses active-low CS for sampling initiation and SCLK for conversion control and data transfer.
It supports two software-selectable unipolar input ranges (0 to VREF and 0 to 2 × VREF), operates with independent analog (+VA) and digital I/O (+VBD) supplies, and provides per-channel high/low alarm outputs via GPIO0–GPIO3 - all within a single 38-pin TSSOP footprint shared across the ADS79xx family.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with ±0.99 LSB differential nonlinearity and 12.2 ENOB at 100 kHz |
| Sample Rate | 1 MSPS maximum - enables real-time capture of fast transients in closed-loop control systems |
| Analog Supply Range | +VA = 2.7 V to 5.25 V - supports direct connection to common industrial rails including 3.3 V and 5 V |
| I/O Supply Range | +VBD = 1.7 V to 5.25 V - allows glueless interfacing with 1.8-V, 3.3-V, or 5-V microcontrollers |
| Input Bandwidth | 47 MHz (3 dB) - preserves signal integrity for wideband sensor inputs without external anti-aliasing complexity |
| Power Dissipation | 14.5 mW typical at 1 MSPS (+VA = 5 V, +VBD = 3 V); 1 μA power-down current - suitable for battery-backed or energy-constrained nodes |
| Alarm Thresholds | Two independently programmable thresholds per channel - enables autonomous over/under-voltage detection without host CPU intervention |
Pinout & Package
ADS7953SBDBTG4 is housed in a 38-pin TSSOP (DBT) package measuring 9.70 mm × 4.40 mm, with exposed thermal pad. Pin functions are validated per TI SLAS605C Rev C (July 2018), confirming full pin compatibility with ADS7952/ADS7956/ADS7960 in same package.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH15 | Analog input | 16 single-ended analog input channels; CH0–CH11 assigned to pins 28–15 in DBT package |
| AINP / AINM | Differential analog input | High-impedance buffered input pair for precision measurement; supports external PGA coupling |
| MXO | Analog output | Multiplexer output - delivers selected channel's analog signal to external buffer or conditioning stage |
| REFP / REFM | Reference input | Accepts external reference (e.g., REF5025); REFP = 2.5 V ± 0.1 V nominal, REFM = AGND |
| CS / SCLK / SDI / SDO | Digital interface | 4-wire SPI-compatible interface; CS active-low initiates sampling on falling edge |
| GPIO0–GPIO3 | Configurable I/O | Four bidirectional pins: GPIO0 = alarm output, GPIO2 = range select, GPIO3 = power-down control |
| +VA / AGND / +VBD / BDGND | Power domains | Separate analog/digital supplies reduce noise coupling; AGND and BDGND must be connected at single point |
Key Features
| Feature | Design Value |
|---|---|
| Zero-latency conversion | Eliminates pipeline delay - critical for real-time feedback in motor control and power supply regulation |
| Per-channel alarm thresholds | Two independent voltage thresholds per channel trigger GPIO outputs without host polling or firmware overhead |
| Auto/manual channel sequencing | Hardware-configurable mode selection enables deterministic scan order or on-demand channel access |
| Wide input voltage range support | Software-selectable 0–VREF or 0–2×VREF spans accommodate diverse sensor outputs without external gain stages |
| Low-power operation | 14.5 mW at full speed and 1 μA in power-down mode - extends runtime in portable or isolated instrumentation |
Applications
| PLC Analog Input Module | Optical Line Card Monitoring |
|---|---|
Use Scenario: Simultaneous acquisition of 16 voltage/current signals from field sensors in modular I/O racks. IC Role / Device Role / Timing Role: Primary ADC managing multiplexed analog front-end with alarm-triggered interrupt signaling to FPGA controller. Use Value: 12-bit resolution and 1-MSPS throughput ensure accurate representation of 4–20 mA loop diagnostics and thermocouple readings across all channels. | Use Scenario: Real-time monitoring of laser bias current, photodiode voltage, and TEC temperature in DWDM transceivers. IC Role / Device Role / Timing Role: Multichannel sensor hub digitizing analog telemetry with autonomous high/low alarm assertion on out-of-spec conditions. Use Value: Dual per-channel alarms enable immediate hardware-level fault response before optical link degradation occurs. |
| Medical Patient Monitor | Digital Power Supply Controller |
Use Scenario: Acquisition of ECG, respiration, and SpO₂ analog waveforms in compact bedside units with low-power constraints. IC Role / Device Role / Timing Role: High-fidelity signal digitizer with zero-latency output and programmable input range matching diverse sensor gains. Use Value: 47 MHz input bandwidth preserves waveform fidelity up to 20 kHz, meeting IEC 60601-2-27 requirements for diagnostic-grade ECG. | Use Scenario: Closed-loop voltage/current sensing in multi-phase VRMs and AC-DC PSUs requiring fast transient response. IC Role / Device Role / Timing Role: Precision ADC feeding digital PWM controller with synchronized sampling and alarm-driven fault shutdown. Use Value: 1-MSPS sampling captures sub-microsecond load transients; GPIO-driven alarm asserts immediately on overvoltage/overcurrent events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7953IRHBT | VQFN-32 package (5.0 mm × 5.0 mm); only one GPIO (GPIO0); no GPIO2/GPIO3 for range/power-down control | Suitable for space-constrained PCBs but lacks full GPIO functionality for autonomous alarm and range switching | Select when board area is critical and alarm logic can be handled externally or via host processor |
| ADS8688IPWR | 16-bit resolution, 500 kSPS, integrated reference and PGA; SPI interface; TSSOP-38 package | Higher resolution and built-in signal conditioning, but lower speed and no per-channel dual alarms | Select when absolute accuracy >12-bit and sensor signal conditioning are prioritized over alarm autonomy and 1-MSPS throughput |
Compared with ADS7953IRHBT, ADS7953SBDBTG4 offers full GPIO control and TSSOP-38 layout compatibility; compared with ADS8688IPWR, it trades resolution for higher speed, lower latency, and hardware-based alarm triggering - making it optimal for responsive industrial monitoring.
Availability
ADS7953SBDBTG4 is available at Aetrix Electronics and suitable for PLC/IPC signal acquisition, optical line card telemetry, and medical instrumentation requiring stable component supply, long-term lifecycle support, and verified industrial-grade performance.
Supply support for ADS7953SBDBTG4 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 delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The ADS79xx product line was designed specifically for high-speed, multichannel data acquisition in programmable logic controllers, optical modules, and medical devices - emphasizing pin compatibility, low-latency conversion, and autonomous alarm capability.
FAQ
What is the maximum sampling rate supported by the ADS7953SBDBTG4?
The ADS7953SBDBTG4 supports a maximum sampling rate of 1 MSPS. This is achieved using its 20-MHz serial interface clock and zero-latency SAR architecture. At this rate, the device consumes 14.5 mW typical power with +VA = 5 V and +VBD = 3 V. The timing specifications confirm tCONV ≤ 900 ns, enabling full 12-bit conversions within each 1-µs cycle. ADS7953SBDBTG4 maintains specified INL and DNL performance across the full 1-MSPS range.
Does the ADS7953SBDBTG4 require an external reference voltage?
Yes, the ADS7953SBDBTG4 requires an external reference applied to the REFP pin, with REFM tied to AGND. The device supports reference voltages from 2.0 V to 3.0 V, and TI recommends REF5025 (2.5 V ± 0.1 V) for optimal performance. Reference input resistance is 1.2 MΩ typical, and the datasheet specifies that VREF must remain stable during conversion. ADS7953SBDBTG4 does not include an internal reference.
How many analog input channels does the ADS7953SBDBTG4 support?
The ADS7953SBDBTG4 supports 16 single-ended analog input channels (CH0 through CH15), as confirmed in the Device Comparison Table and Pin Functions section of SLAS605C. In the 38-pin TSSOP (DBT) package, CH0–CH11 are assigned to pins 28–15, while CH12–CH15 occupy pins 14–11. All 16 channels are accessible and fully functional in ADS7953SBDBTG4.
What GPIO functionality is available on the ADS7953SBDBTG4?
The ADS7953SBDBTG4 provides four individually configurable GPIOs (GPIO0–GPIO3) in its TSSOP-38 package. GPIO0 serves as active-high alarm output, GPIO2 as range-select input (0 = 0–VREF, 1 = 0–2×VREF), and GPIO3 as active-low power-down control. GPIO1 is a general-purpose I/O. This full GPIO set is exclusive to TSSOP-packaged ADS79xx devices; VQFN variants offer only GPIO0. ADS7953SBDBTG4 leverages all four for autonomous system-level control.
Is the ADS7953SBDBTG4 pin-compatible with other devices in the ADS79xx family?
Yes, ADS7953SBDBTG4 is fully pin-compatible with ADS7952, ADS7956, and ADS7960 in the 38-pin TSSOP (DBT) package, sharing identical pinout, footprint, and power domain assignments. This allows drop-in replacement across 12-/10-/8-bit variants and 16-/12-channel configurations without PCB redesign. Pin compatibility is explicitly stated in the "ADS79xx Pin Compatible" title of SLAS605C and verified in the Pin Configuration tables.
ADS7953SBDBTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
ADS7953SBDBTG4 FAQ
1.How can I place an order for ADS7953SBDBTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7953SBDBTG4 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 ADS7953SBDBTG4 reliable?
The price and inventory of ADS7953SBDBTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7953SBDBTG4 is usually 5 days.
3.What payment methods are accepted for ADS7953SBDBTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7953SBDBTG4 transactions.
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4.How is shipping managed for ADS7953SBDBTG4?
ADS7953SBDBTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7953SBDBTG4 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 ADS7953SBDBTG4?
For technical support, including ADS7953SBDBTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7953SBDBTG4 requirements.
6.How does Aetrix verify that ADS7953SBDBTG4 is sourced from the original manufacturer or authorized distributors?
All ADS7953SBDBTG4 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 ADS7953SBDBTG4 meets industry standards.
7.What is the process for return or replacement of ADS7953SBDBTG4?
All ADS7953SBDBTG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7953SBDBTG4, 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 ADS7953SBDBTG4 part is unused and in its original packaging.
Return procedure for ADS7953SBDBTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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