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Texas Instruments ADS7957SDBT
- Part No.:
- ADS7957SDBT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7957SDBT.pdf
- Description:
- IC ADC 10BIT SAR 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,265
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Product details
Overview
ADS7957SDBT 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 programmable per-channel alarm thresholds. It features a 20-MHz SPI-compatible serial interface, dual input ranges (0 to VREF and 0 to 2×VREF), and operates from 2.7–5.25 V analog supply. Used in high-speed PLC data acquisition and optical line card monitoring.
For engineers reviewing the ADS7957SDBT datasheet, ADS7957SDBT pinout, ADS7957SDBT application, or ADS7957SDBT equivalent, key selection criteria include channel count (16), resolution (12-bit), sampling speed (1 MSPS), alarm functionality, GPIO configuration flexibility, and TSSOP-38 package compatibility with other ADS79xx family members.
Technical Context
The ADS7957SDBT implements a capacitor-based SAR architecture with integrated sample-and-hold, enabling true zero-latency conversion. Its multiplexer supports 16 single-ended analog inputs (Ch0–Ch15), routed to AINP via MXO output, with configurable gain control via external PGA or buffer.
Serial communication uses CS (active-low), SCLK, SDI, and SDO signals for command and data transfer at up to 20 MHz. Channel selection operates in auto-sequencing or manual mode, and two software-programmable alarm levels per channel trigger GPIO0 (Alarm) and GPIO1 (Low alarm) outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes for precise analog signal digitization |
| Sample Rate | 1 MSPS - supports real-time capture 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 and 5 V rails without LDOs |
| I/O Supply Range | 1.7 V to 5.25 V - ensures glueless interfacing with diverse microcontrollers and FPGAs |
| Input Ranges | 0 to VREF and 0 to 2×VREF - selectable per device via GPIO2 (Range pin), supporting flexible sensor scaling |
| Alarm Functionality | Two programmable thresholds per channel - enables autonomous over/under-voltage detection without host polling |
| Power Dissipation | 14.5 mW at 1 MSPS (+VA = 5 V, +VBD = 3 V) - suitable for thermally constrained embedded modules |
| Input Bandwidth | 47 MHz at 3 dB - preserves fidelity of high-frequency sensor signals before digitization |
Pinout & Package
ADS7957SDBT is housed in a 38-pin TSSOP (DBT) package measuring 9.70 mm × 4.40 mm, with exposed thermal pad for enhanced power dissipation in continuous high-speed operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Ch0–Ch15 | Analog input | 16 single-ended channels routed through internal multiplexer to AINP |
| AINP / AINM | Differential analog input pair | Primary ADC input path; AINM serves as reference ground for pseudo-differential configurations |
| MXO | Analog output | Multiplexer output stage - provides buffered access to selected channel for external signal conditioning |
| REFP / REFM | Analog reference inputs | Accept external reference voltage (e.g., REF5025); REFM is reference ground, not AGND |
| CS / SCLK / SDI / SDO | Digital interface | Standard SPI-compatible control and data lines; CS active-low enables multi-device bus sharing |
| GPIO0–GPIO3 | Programmable I/O | GPIO0 = Alarm output, GPIO1 = Low-alarm output, GPIO2 = Range select, GPIO3 = Power-down input |
| +VA / AGND | Analog power domain | +VA powers analog core and reference circuitry; AGND must be star-connected to minimize noise coupling |
| +VBD / BDGND | Digital I/O power domain | +VBD supplies digital interface and GPIOs; separation from +VA reduces digital switching noise injection |
Key Features
| Feature | Design Value |
|---|---|
| Pin-compatible family | Shares 38-pin TSSOP footprint with ADS7952/ADS7953/ADS7960/ADS7961 - simplifies design reuse across 12-/10-/8-bit variants |
| Zero-latency conversion | Eliminates pipeline delay - critical for real-time feedback in motor control and power supply regulation |
| Per-channel alarm thresholds | Two independently set thresholds per channel reduce host CPU load and enable deterministic fault response |
| Flexible input range selection | Software-selectable 0–VREF or 0–2×VREF ranges optimize dynamic range for varying sensor output spans |
| Low-power power-down mode | 1 μA quiescent current during idle periods - extends battery life in portable instrumentation |
| Wide input bandwidth | 47 MHz analog input bandwidth supports anti-aliasing filter design for signals up to ~7 MHz Nyquist |
Applications
| PLC Analog Input Module | Optical Line Card Monitoring |
|---|---|
Use Scenario: Simultaneous monitoring of 16 voltage/current sensors in industrial programmable logic controller backplanes. IC Role / Device Role / Timing Role: Primary ADC for analog input expansion, performing synchronized 1-MSPS sampling across all channels in auto-sequencing mode. Use Value: Eliminates need for multiple lower-channel ADCs and associated multiplexing logic, reducing BOM count and PCB area by >40%. |
Use Scenario: Real-time tracking of laser bias current, photodiode output, TEC voltage, and temperature sensors on telecom line cards. IC Role / Device Role / Timing Role: Centralized signal acquisition unit with per-sensor alarm triggering to flag out-of-spec conditions before service interruption. Use Value: Enables autonomous fault detection using GPIO0/GPIO1 alarms, cutting host polling overhead and improving system response time by 3×. |
| Medical Patient Monitor Front-End | Digital Power Supply Telemetry |
Use Scenario: Digitizing ECG leads, respiration, SpO₂, and NIBP pressure signals in compact bedside monitors. IC Role / Device Role / Timing Role: High-fidelity analog front-end ADC with low-noise performance and zero-latency output for waveform integrity. Use Value: 47 MHz input bandwidth preserves transient fidelity of physiological waveforms, meeting IEC 60601-2-27 clinical accuracy requirements. |
Use Scenario: Measuring rail voltages, phase currents, and thermal sensors in multi-phase VRMs and AC-DC converters. IC Role / Device Role / Timing Role: Telemetry ADC feeding digital controller (e.g., C2000 MCU) with synchronized 16-channel readings for adaptive loop compensation. Use Value: 1-MSPS sampling enables sub-microsecond timing alignment between voltage and current measurements, improving power loss calculation accuracy by ±0.8%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7953SDBT | Same 16-channel, 12-bit, 1-MSPS spec, but lacks GPIO2 (Range) and GPIO3 (PD) pins; only 2 GPIOs (GPIO0/1) implemented | Cannot support dual input range selection or hardware power-down; requires host-controlled range switching | Select ADS7953SDBT only if dual-range operation and autonomous power management are unnecessary |
| ADS8688IPWR | 8-channel, 16-bit, 1-MSPS SAR ADC with integrated reference and programmable input ranges; uses SPI interface but no per-channel alarms | Higher resolution but fewer channels; no alarm outputs - requires host firmware for threshold checking | Choose ADS8688IPWR when 16-bit precision is mandatory and channel count can be reduced to 8 with external multiplexing |
Compared with ADS7953SDBT, ADS7957SDBT adds full GPIO configurability and hardware alarm autonomy; versus ADS8688IPWR, it trades resolution for channel density and embedded alarm intelligence - making ADS7957SDBT optimal for high-channel-count, real-time fault-aware systems.
Availability
ADS7957SDBT is available at Aetrix Electronics and suitable for PLC/IPC, optical line card monitoring, and medical instrumentation requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.
Supply support for ADS7957SDBT 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 specifically for high-channel-count, real-time data acquisition in programmable logic controllers, optical networking equipment, and automated test systems - emphasizing pin compatibility, low latency, and autonomous monitoring features.
FAQ
What is the maximum sampling rate supported by the ADS7957SDBT?
The ADS7957SDBT supports a maximum sampling rate of 1 million samples per second (1 MSPS). This rate is achievable across all 16 channels in auto-sequencing mode with guaranteed timing compliance per the SLAS605C datasheet. The device maintains full 12-bit ENOB performance at this rate under recommended operating conditions (e.g., +VA = 5 V, VREF = 2.5 V).
Does the ADS7957SDBT require an external reference voltage?
Yes, the ADS7957SDBT requires an external reference voltage applied to the REFP pin, with REFM serving as its dedicated reference ground. The device does not include an internal reference. A precision source such as the REF5025 (2.5 V ±0.1 V) is recommended to achieve specified total unadjusted error (TUE) performance.
How many GPIOs are available on the ADS7957SDBT, and what are their functions?
The ADS7957SDBT provides four GPIOs (GPIO0–GPIO3) in its 38-pin TSSOP package. GPIO0 serves as an active-high alarm output, GPIO1 as an active-high low-alarm indicator, GPIO2 selects input range (0 = 0–VREF, 1 = 0–2×VREF), and GPIO3 is an active-low power-down control. All are individually configurable via internal registers.
Is the ADS7957SDBT pin-compatible with other devices in the ADS79xx family?
Yes, the ADS7957SDBT is fully pin-compatible with ADS7952SDBT, ADS7953SDBT, ADS7960SDBT, and ADS7961SDBT in the 38-pin TSSOP (DBT) package. This allows drop-in replacement across 12-bit (16-channel), 10-bit (16-channel), and 8-bit (16-channel) variants without PCB redesign.
What is the purpose of the MXO pin on the ADS7957SDBT?
The MXO (Multiplexer Output) pin on the ADS7957SDBT provides buffered access to the selected analog channel's signal prior to ADC conversion. It enables connection to external signal conditioning circuits - such as a high-input-impedance PGA or buffer (e.g., THS4031) - allowing gain adjustment or filtering without loading the multiplexer output.
ADS7957SDBT 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:
- 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:
- -
ADS7957SDBT FAQ
1.How can I place an order for ADS7957SDBT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7957SDBT 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 ADS7957SDBT reliable?
The price and inventory of ADS7957SDBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7957SDBT is usually 5 days.
3.What payment methods are accepted for ADS7957SDBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7957SDBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7957SDBT?
ADS7957SDBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7957SDBT 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 ADS7957SDBT?
For technical support, including ADS7957SDBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7957SDBT requirements.
6.How does Aetrix verify that ADS7957SDBT is sourced from the original manufacturer or authorized distributors?
All ADS7957SDBT 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 ADS7957SDBT meets industry standards.
7.What is the process for return or replacement of ADS7957SDBT?
All ADS7957SDBT units undergo pre-shipment inspection (PSI). If there is an issue with ADS7957SDBT, 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 ADS7957SDBT part is unused and in its original packaging.
Return procedure for ADS7957SDBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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