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Texas Instruments ADS7957SRHBR
- Part No.:
- ADS7957SRHBR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ADS7957SRHBR.pdf
- Description:
- IC ADC 10BIT SAR 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
ADS7957SRHBR 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 20-MHz serial interface. It features two software-selectable unipolar input ranges (0 to VREF and 0 to 2×VREF), programmable per-channel high/low alarm thresholds, and operates from 2.7–5.25 V analog supply. It is used in PLC analog input modules for real-time sensor monitoring.
For engineers reviewing the ADS7957SRHBR datasheet, ADS7957SRHBR pinout, ADS7957SRHBR application, or ADS7957SRHBR equivalent, key selection considerations include channel count (16), resolution (12-bit), serial timing compliance (20-MHz SCLK), alarm threshold configurability, and VQFN-32 package compatibility with isolated industrial signal chains.
Technical Context
The ADS7957SRHBR implements a capacitor-based SAR architecture with integrated sample-and-hold, enabling true zero-latency conversion-critical for closed-loop control. Its multiplexer output (MXO) supports external high-impedance PGA buffering (e.g., THS4031), and its dual-range input scaling (0–VREF / 0–2×VREF) is controlled via GPIO2 (Range pin).
It supports both auto-sequencing across preselected channels and manual channel selection via SDI commands. The device uses falling-edge CS to initiate sampling and SCLK-synchronized serial data transfer (SDO/SDI), with CS active-low assertion defining frame boundaries for reliable microprocessor/DSP interfacing.
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 power supply monitoring |
| Input Channels | 16 single-ended - enables consolidated analog front-end for multi-sensor industrial I/O modules |
| Serial Interface Speed | 20 MHz SCLK - allows sub-100 ns per bit timing, minimizing host CPU overhead in high-throughput systems |
| Analog Supply Range | 2.7 V to 5.25 V - compatible with standard 3.3 V and 5 V industrial rails without LDO regulation |
| Power Dissipation | 14.5 mW at 1 MSPS (+VA = 5 V, +VBD = 3 V) - enables thermally constrained embedded designs |
| Alarm Thresholds | Two per channel (high/low) - provides autonomous over/under-limit detection without host polling |
Pinout & Package
RHB package: 32-pin VQFN, 5.00 mm × 5.00 mm body, 0.5-mm pitch, exposed thermal pad (pin 32 = AGND). Pinout validated per TI SLAS605C Rev C, Figure 6 (RHB top view) and Pin Functions table for ADS7957.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Ch0–Ch15 | Analog input | 16 single-ended analog inputs routed to internal multiplexer; Ch0–Ch7 assigned to pins 20–13 (RHB), Ch8–Ch15 to pins 12–5 |
| MXO | Analog output | Multiplexer output - connects to external PGA or buffer; enables high-Z signal conditioning before ADC core |
| AINP / AINM | Analog input | Differential reference path for internal comparator; AINP accepts buffered MXO signal, AINM is dedicated ground reference |
| REFP / REFM | Analog reference | High-precision reference input (REFP) and return (REFM); supports external REF5025 (2.5 V ±0.1 V) |
| CS / SCLK / SDI / SDO | Digital interface | Standard 4-wire SPI-compatible interface; CS active-low initiates conversion, SCLK clocks all serial transfers |
| GPIO0 | Digital I/O | Configurable as alarm output (active-high) - asserts when any channel exceeds programmed thresholds |
| +VA / AGND / +VBD / BDGND | Power & ground | Separate analog/digital supplies reduce noise coupling; +VA powers core ADC, +VBD powers digital I/O (1.7–5.25 V) |
Key Features
| Feature | Design Value |
|---|---|
| Zero-latency conversion | Eliminates pipeline delay - essential for real-time feedback in motor control and power supply loops |
| Per-channel programmable alarms | Reduces host processor load by autonomously flagging out-of-range conditions on any of 16 inputs |
| Software-selectable input range | Single configuration bit (GPIO2) switches full-scale from VREF to 2×VREF - simplifies dynamic range adaptation |
| 1-MSPS sustained throughput | Guarantees ≤1 µs conversion time per sample - meets timing budgets in high-speed data loggers |
| VQFN-32 thermal performance | Exposed pad and low RθJA (42°C/W, junction-to-ambient) sustains 14.5 mW dissipation without derating |
Applications
| PLC Analog Input Module | Optical Line Card Monitoring |
|---|---|
Use Scenario: Digitizing 16 temperature, pressure, and current loop signals in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Primary ADC managing all analog front-end sampling; zero-latency ensures deterministic scan cycle timing. Use Value: 16-channel integration reduces component count vs. multiple 8-channel ADCs; 12-bit resolution meets IEC 61000-4-3 immunity requirements for industrial EMC. | Use Scenario: Real-time monitoring of laser bias current, TEC voltage, and photodiode outputs across 16 ports in a telecom line card. IC Role / Device Role / Timing Role: High-speed, multi-channel digitizer synchronized to system clock; alarms trigger immediate optical power adjustment. Use Value: 20-MHz SCLK supports <100 ns per sample readout, enabling sub-microsecond response to fault events. |
| Medical Patient Monitor Front-End | Digital Power Supply Telemetry |
Use Scenario: Simultaneous acquisition of ECG, SpO₂, NIBP, and respiration signals in portable patient monitors. IC Role / Device Role / Timing Role: Central SAR ADC with MXO output driving external THS4031 buffer for high-impedance biopotential signals. Use Value: 47 MHz input bandwidth preserves signal integrity for >10 kHz physiological harmonics; low 14.5 mW power extends battery life. | Use Scenario: Closed-loop telemetry of rail voltages, phase currents, and thermal sensors in multi-phase VRMs and POL converters. IC Role / Device Role / Timing Role: Real-time ADC feeding digital controller (e.g., C2000 MCU); alarms trigger immediate OVP/UVP shutdown. Use Value: Two per-channel thresholds enable independent high/low limits - critical for asymmetric fault protection in power stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7953SRHBR | 12-bit, 16-channel, identical pinout and interface - differs only in default GPIO configuration and minor timing spec tolerances | No functional difference in PLC or power monitoring; same alarm and range features | Select ADS7953SRHBR if legacy design validation used that variant; ADS7957SRHBR offers identical performance with updated production mask |
| AD7949BCPZ-RL7 | 14-bit, 8-channel, SPI interface, 1-MSPS - higher resolution but half the channel count; requires PCB redesign due to LFCSP-32 package and different pin mapping | Suitable for higher-accuracy, lower-channel-count applications (e.g., test equipment), not drop-in replacement | Choose AD7949BCPZ-RL7 only when 14-bit resolution is mandatory and channel consolidation is handled externally |
Compared with ADS7953SRHBR, ADS7957SRHBR provides identical functionality with updated characterization; versus AD7949BCPZ-RL7, it trades resolution for channel density and maintains pin compatibility within TI's ADS79xx family-enabling seamless migration in existing VQFN-32 layouts.
Availability
ADS7957SRHBR is available at Aetrix Electronics and suitable for PLC analog input modules, optical line card monitoring, medical instrumentation, digital power supply telemetry, and high-speed closed-loop systems requiring stable component supply and long-term industrial availability.
Supply support for ADS7957SRHBR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The ADS79xx product line was designed specifically for high-channel-density, medium-speed industrial data acquisition-emphasizing zero-latency, flexible input scaling, and robust serial interfacing in space-constrained environments.
FAQ
What is the maximum supported SCLK frequency for ADS7957SRHBR?
The ADS7957SRHBR supports up to 20 MHz SCLK frequency, enabling serial data transfer at ≤100 ns per bit. This timing is validated across the full operating temperature range (–40°C to +125°C) and ensures reliable communication with microcontrollers and DSPs without setup/hold violations. The ADS7957SRHBR datasheet specifies tCH and tCL minimums of 25 ns each at 20 MHz.
Does ADS7957SRHBR require an external reference voltage?
Yes, ADS7957SRHBR requires an external precision reference applied to REFP and REFM pins. It is typically paired with REF5025 (2.5 V ±0.1 V), supporting both 0–VREF and 0–2×VREF input ranges. The device does not include an internal reference; omitting an external reference will result in undefined conversion results.
How many GPIOs are available on ADS7957SRHBR in the RHB (VQFN-32) package?
The ADS7957SRHBR in the RHB package provides one configurable GPIO: GPIO0, which can be set as an active-high alarm output. Unlike TSSOP variants, the VQFN-32 version does not include GPIO1–GPIO3; this is confirmed in TI SLAS605C Rev C, Pin Functions table for VQFN packages.
What is the purpose of the MXO pin on ADS7957SRHBR?
The MXO (Multiplexer Output) pin on ADS7957SRHBR provides the buffered analog signal selected by the internal channel multiplexer, prior to the ADC core. It is intended for connection to an external high-input-impedance PGA (e.g., THS4031) to condition weak or high-impedance sensor signals before digitization-preserving signal integrity without loading the multiplexer output.
Can ADS7957SRHBR operate with separate analog and digital supply voltages?
Yes, ADS7957SRHBR supports independent analog (+VA) and digital I/O (+VBD) supplies: +VA ranges from 2.7 V to 5.25 V for the ADC core, while +VBD ranges from 1.7 V to 5.25 V for digital interface logic. This separation minimizes digital switching noise coupling into the analog path and enables glueless interfacing with mixed-voltage host systems.
ADS7957SRHBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- 32-VQFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7957SRHBR FAQ
1.How can I place an order for ADS7957SRHBR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7957SRHBR 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 ADS7957SRHBR reliable?
The price and inventory of ADS7957SRHBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7957SRHBR is usually 5 days.
3.What payment methods are accepted for ADS7957SRHBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7957SRHBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7957SRHBR?
ADS7957SRHBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7957SRHBR 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 ADS7957SRHBR?
For technical support, including ADS7957SRHBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7957SRHBR requirements.
6.How does Aetrix verify that ADS7957SRHBR is sourced from the original manufacturer or authorized distributors?
All ADS7957SRHBR 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 ADS7957SRHBR meets industry standards.
7.What is the process for return or replacement of ADS7957SRHBR?
All ADS7957SRHBR units undergo pre-shipment inspection (PSI). If there is an issue with ADS7957SRHBR, 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 ADS7957SRHBR part is unused and in its original packaging.
Return procedure for ADS7957SRHBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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