My Inquiry
My Account
Texas Instruments ADS7956SDBT
- Part No.:
- ADS7956SDBT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7956SDBT.pdf
- Description:
- IC ADC 10BIT SAR 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,781
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ADS7956SDBT from Texas Instruments is a 12-bit, 12-channel, single-ended SAR analog-to-digital converter with 1-MSPS sample rate, zero-latency operation, and 20-MHz SPI-compatible serial interface. It features two software-selectable unipolar input ranges (0 to VREF and 0 to 2×VREF), four programmable GPIOs, and dual per-channel alarm thresholds - used in PLC analog input modules for real-time sensor monitoring.
For engineers reviewing the ADS7956SDBT datasheet, ADS7956SDBT pinout, ADS7956SDBT application, or ADS7956SDBT equivalent, key selection considerations include channel count (12), resolution (12-bit), supply flexibility (2.7–5.25 V analog, 1.7–5.25 V I/O), alarm threshold configurability, and TSSOP-30 package compatibility with other ADS79xx family members.
Technical Context
The ADS7956SDBT implements a capacitor-based SAR architecture with integrated sample-and-hold, enabling true zero-latency conversion. Its multiplexer output (MXO) supports external high-impedance PGA buffering (e.g., THS4031), and it accepts reference inputs via REFP/REFM pins with 2.5 V ±0.1 V nominal reference voltage.
Channel selection operates in auto-sequencing (predefined order) or manual mode (register-controlled), while GPIO0–GPIO3 support configurable functions including power-down (PD), range selection (Range), and alarm outputs (Alarm, Low-alarm). The device uses falling-edge CS for sampling and SCLK-synchronized serial data transfer.
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 - supports real-time acquisition of fast transients in closed-loop control systems |
| Analog Supply Range | 2.7 V to 5.25 V - enables direct integration with industrial 3.3 V or 5 V rails without LDO overhead |
| I/O Supply Range | 1.7 V to 5.25 V - ensures glueless interfacing with low-voltage microcontrollers (e.g., 1.8 V logic) |
| Input Ranges | 0 to VREF or 0 to 2×VREF - selectable per system gain requirements; avoids external scaling resistors |
| Power Dissipation | 14.5 mW at 1 MSPS (+VA = 5 V, +VBD = 3 V) - suitable for thermally constrained PLC backplanes |
| Power-Down Current | 1 µA - extends battery life in portable instrumentation or reduces idle power in multi-ADC systems |
Pinout & Package
The ADS7956SDBT is housed in a 30-pin TSSOP (DBT) package measuring 7.80 mm × 4.40 mm, with exposed thermal pad for enhanced heat dissipation in continuous high-speed operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AINP / AINM | Differential analog input pair | Accepts buffered or unbuffered single-ended signals; AINM tied to AGND for true single-ended mode |
| MXO | Multiplexer output | Drives external high-impedance PGA (e.g., THS4031); enables signal conditioning before ADC sampling |
| Ch0–Ch11 | Analog input channels | 12 dedicated single-ended analog inputs; internally routed to SAR core via programmable MUX |
| REFP / REFM | Reference voltage terminals | Support external 2.5 V reference (REF5025) or internal reference bypass; define full-scale range |
| CS / SCLK / SDI / SDO | SPI interface signals | Standard 4-wire SPI with active-low CS; SCLK up to 20 MHz enables compact timing budgets |
| GPIO0–GPIO3 | Programmable digital I/O | Configurable as PD (power-down), Range (input range select), Alarm, or Low-alarm outputs |
| +VA / AGND / +VBD / BDGND | Power and ground 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 high-speed closed-loop feedback where immediate result availability is required |
| Two per-channel alarm thresholds | Enables autonomous over/under-range detection without host CPU intervention, reducing polling overhead |
| Auto/manual channel sequencing | Auto mode simplifies firmware for cyclic scanning; manual mode allows dynamic channel selection based on event triggers |
| Wide I/O supply range (1.7–5.25 V) | Permits direct connection to diverse host processors (ARM Cortex-M0+, FPGA I/O banks, DSPs) without level shifters |
| 4-GPIO configuration (TSSOP) | Provides hardware-level control of power state, input range, and alarm signaling - offloads timing-critical tasks from firmware |
Applications
| PLC Analog Input Module | Optical Line Card Monitoring |
|---|---|
Use Scenario: Simultaneous acquisition of 12 temperature, pressure, and current loop sensors in modular industrial controllers. IC Role / Device Role / Timing Role: Primary ADC front-end with integrated MUX and alarm generation, synchronizing conversions across all channels at 1 MSPS. Use Value: Reduces BOM count by eliminating discrete MUX and comparator ICs; alarm outputs trigger immediate fault isolation without host latency. | Use Scenario: Real-time monitoring of laser bias current, TEC voltage, and photodiode outputs in telecom line cards. IC Role / Device Role / Timing Role: High-speed, multi-channel digitizer with zero-latency response to optical power fluctuations. Use Value: Enables sub-microsecond reaction to laser drift or fiber fault events using programmable per-channel alarms. |
| Medical Patient Monitor | Digital Power Supply Telemetry |
Use Scenario: Acquisition of ECG leads, respiration, SpO₂ analog signals in portable bedside monitors. IC Role / Device Role / Timing Role: Low-power, multi-signal ADC with flexible input ranges accommodating varying sensor output amplitudes. Use Value: 1 µA power-down mode extends battery runtime between measurements; 12-bit resolution preserves diagnostic fidelity. | Use Scenario: Monitoring rail voltages, phase currents, and thermal sensors in server PSU or DC-DC controller boards. IC Role / Device Role / Timing Role: Telemetry ADC interfacing directly to PMBus-capable microcontrollers via SPI. Use Value: Wide 1.7–5.25 V I/O supply supports direct connection to 3.3 V PMBus masters; GPIO alarm flags simplify fault reporting. |
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 | 16-channel, same 12-bit resolution and 1-MSPS rate; shares identical TSSOP-30 footprint and pinout | Higher channel density suits systems requiring more analog inputs without layout change | Select when expanding channel count beyond 12 while retaining PCB compatibility and firmware structure |
| ADS7952SDBT | 12-channel, 12-bit, 1-MSPS - identical channel count and performance; differs only in device ID register and minor timing specs | No functional difference in signal chain design; fully interchangeable in existing ADS7956SDBT layouts | Valid drop-in replacement where ADS7956SDBT is unavailable; verify firmware reads correct device ID if used for identification |
Compared with ADS7953SDBT (16-channel) and ADS7952SDBT (identical 12-channel variant), the ADS7956SDBT offers the same precision and speed but is specifically optimized for 12-input systems where pin count and routing simplicity outweigh extra channel capacity.
Availability
ADS7956SDBT is available at Aetrix Electronics and suitable for PLC/IPC, optical line card monitoring, medical instrumentation, digital power supplies, and high-speed data acquisition systems requiring stable component supply and long-term industrial lifecycle support.
Supply support for ADS7956SDBT 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-grade ICs.
The ADS79xx product line was designed for high-channel-count, medium-speed industrial data acquisition - emphasizing zero-latency operation, flexible supply rails, integrated alarm logic, and pin compatibility across resolution and channel variants.
FAQ
What is the maximum sampling rate of the ADS7956SDBT?
The ADS7956SDBT achieves a maximum sampling rate of 1 million samples per second (1 MSPS). This rate is sustained across all 12 channels in auto-sequencing mode and is enabled by its 20-MHz SPI interface clock and zero-latency SAR architecture. The ADS7956SDBT maintains this performance under recommended operating conditions: +VA = 2.7 V to 5.25 V and +VBD = 1.7 V to 5.25 V.
Does the ADS7956SDBT require an external reference voltage?
Yes, the ADS7956SDBT requires an external reference voltage applied to the REFP and REFM pins. It is typically used with a precision 2.5 V reference such as the REF5025, supporting input ranges of 0 to VREF or 0 to 2×VREF. The device does not include an internal reference; REFP must be driven with a stable, low-noise source to maintain 12-bit accuracy.
How many GPIOs does the ADS7956SDBT provide, and what are their functions?
The ADS7956SDBT provides four individually configurable GPIOs (GPIO0–GPIO3) in its TSSOP-30 (DBT) package. These support programmable functions including power-down (PD), input range selection (Range), high-alarm output, and low-alarm output - all defined via internal registers. Unlike VQFN variants, the DBT package fully utilizes all four GPIOs for system-level control and fault signaling.
Is the ADS7956SDBT pin-compatible with other devices in the ADS79xx family?
Yes, the ADS7956SDBT is pin-compatible with other 12-channel ADS79xx devices in the same TSSOP-30 package, including ADS7952SDBT and ADS7953SDBT. All share identical pin assignments for analog inputs (Ch0–Ch11), reference (REFP/REFM), SPI interface (CS/SCLK/SDI/SDO), and GPIOs. This allows hardware reuse across 10-bit (ADS7955), 12-bit (ADS7952/ADS7956), and 16-channel (ADS7953) variants.
What is the power consumption of the ADS7956SDBT during active and power-down operation?
The ADS7956SDBT consumes 14.5 mW at 1 MSPS with +VA = 5 V and +VBD = 3 V. In power-down mode, current drops to 1 µA - achieved by asserting the PD function on GPIO3 or issuing a command via SPI. This ultra-low standby current supports energy-sensitive applications like battery-powered test equipment and isolated sensor nodes where periodic wake-up is required.
ADS7956SDBT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 12
- 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:
- -
ADS7956SDBT FAQ
1.How can I place an order for ADS7956SDBT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7956SDBT 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 ADS7956SDBT reliable?
The price and inventory of ADS7956SDBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7956SDBT is usually 5 days.
3.What payment methods are accepted for ADS7956SDBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7956SDBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7956SDBT?
ADS7956SDBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7956SDBT 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 ADS7956SDBT?
For technical support, including ADS7956SDBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7956SDBT requirements.
6.How does Aetrix verify that ADS7956SDBT is sourced from the original manufacturer or authorized distributors?
All ADS7956SDBT 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 ADS7956SDBT meets industry standards.
7.What is the process for return or replacement of ADS7956SDBT?
All ADS7956SDBT units undergo pre-shipment inspection (PSI). If there is an issue with ADS7956SDBT, 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 ADS7956SDBT part is unused and in its original packaging.
Return procedure for ADS7956SDBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADS7956SDBT Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
