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Texas Instruments ADS7953SBRHBT
- Part No.:
- ADS7953SBRHBT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ADS7953SBRHBT.pdf
- Description:
- IC ADC 12BIT SAR 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,229
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Product details
Overview
ADS7953SBRHBT 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), four programmable GPIOs, and dual per-channel alarm thresholds-designed for high-speed PLC analog input modules requiring deterministic timing and channel sequencing.
For engineers reviewing the ADS7953SBRHBT datasheet, ADS7953SBRHBT pinout, ADS7953SBRHBT application, or ADS7953SBRHBT equivalent, key selection considerations include its 16-channel count in 32-pin VQFN (RHB), 12-bit resolution at 1 MSPS, GPIO-configurable alarm outputs, auto/manual channel sequencing modes, and compatibility with isolated industrial I/O power domains (2.7–5.25 V analog, 1.7–5.25 V I/O supply).
Technical Context
The ADS7953SBRHBT implements a capacitor-based SAR architecture with integrated sample-and-hold, sampling on the falling edge of CS and using SCLK for conversion control and serial data transfer. Its multiplexer supports 16 single-ended analog inputs (Ch0–Ch15) routed to AINP/AINM, with MXO providing buffered multiplexer output for external signal conditioning.
It operates in Auto-1, Auto-2, or Manual mode for channel selection, supports two programmable alarm levels per channel (high/low), and uses GPIO0–GPIO3 for configurable digital I/O-including Range selection (0/1 for VREF or 2×VREF), PD (active-low power-down), and alarm flag outputs-all managed via SPI-compatible SDI/SDO/SCLK/CS interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with inherent sample-and-hold; delivers full-scale accuracy without external hold circuitry. |
| Sample Rate | 1 MSPS maximum; enables real-time monitoring of fast transients in motor control feedback or power supply telemetry. |
| Analog Supply | 2.7 V to 5.25 V (+VA); supports direct connection to industrial 3.3 V or 5 V rails without LDO regulation. |
| I/O Supply | 1.7 V to 5.25 V (+VBD); allows glueless interfacing with 1.8 V, 3.3 V, or 5 V microcontrollers and FPGAs. |
| Input Ranges | Software-selectable 0 to VREF or 0 to 2×VREF; accommodates both precision 2.5 V reference (REF5025) and rail-to-rail sensor outputs. |
| Alarm Function | Two independently programmable thresholds per channel; generates active-high GPIO alarm flags without host polling overhead. |
| Power Dissipation | 14.5 mW typical at 5 V analog / 3 V I/O supply and 1 MSPS; reduces thermal load in dense I/O modules. |
| Power-Down Current | 1 μA max; enables rapid sleep/wake cycles in battery-backed or energy-conscious systems. |
Pinout & Package
ADS7953SBRHBT is housed in a 32-pin VQFN package (RHB), 5.00 mm × 5.00 mm, 0.5 mm pitch, thermally enhanced with exposed thermal pad. Pin functions are validated per TI SLAS605C Rev C (July 2018), with all pins assigned per device-specific mapping-not shared across family variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Ch0–Ch15 | Analog input | 16 single-ended analog input channels; Ch0–Ch7 mapped to pins 20–13 (RHB), Ch8–Ch15 to pins 12–5. |
| AINP / AINM | Differential ADC input | Primary analog input pair; accepts conditioned signal from external PGA or buffer (e.g., THS4031). |
| MXO | Analog output | Multiplexer output; provides buffered access to selected channel for external diagnostics or signal routing. |
| REFP / REFM | Reference input | High-impedance reference terminals accepting 2.5 V ±0.1 V (REF5025) or externally generated VREF. |
| CS / SCLK / SDI / SDO | Digital interface | SPI-compatible 4-wire serial interface; CS active-low enables multi-device sharing on same bus. |
| GPIO0–GPIO3 | Configurable I/O | Four bidirectional pins: GPIO0 = Alarm, GPIO1 = Low-alarm, GPIO2 = Range select, GPIO3 = PD (active-low). |
| +VA / AGND | Analog power | Separate analog supply and ground (pins 21, 32 / 1, 22) minimize noise coupling into conversion path. |
| +VBD / BDGND | Digital I/O power | Independent digital supply domain isolates logic noise from analog section and enables mixed-voltage operation. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-latency conversion | Eliminates pipeline delay; critical for closed-loop control where ADC result must be acted upon in next cycle. |
| Auto-sequencing modes | Auto-1 (sequential) and Auto-2 (repeating) reduce host CPU overhead in continuous multi-channel acquisition. |
| Per-channel alarm thresholds | Two independent voltage thresholds per channel trigger dedicated GPIO flags-enabling hardware-level fault detection. |
| Wide input bandwidth | 47 MHz (3 dB) analog input bandwidth supports anti-aliasing filter design for >10 kHz signals without attenuation. |
| Low-power power-down | 1 μA shutdown current enables rapid entry/exit from low-power state during idle periods in cyclic acquisition. |
| Pin-compatible family | Shares 32-pin VQFN footprint with ADS7957 (10-bit) and ADS7961 (8-bit), simplifying design reuse and BOM rationalization. |
Applications
| PLC Analog Input Module | Optical Line Card Monitoring |
|---|---|
|
Use Scenario: Simultaneous acquisition of 16 voltage/current sensor outputs in modular I/O rack for real-time process control. IC Role / Device Role / Timing Role: Primary 12-bit ADC managing all analog front-end digitization; zero-latency ensures deterministic loop timing. Use Value: 16-channel integration eliminates need for multiple 4/8-channel ADCs, reducing PCB area and interconnect complexity while maintaining 1 MSPS aggregate throughput. |
Use Scenario: Real-time monitoring of laser bias current, TEC voltage, and photodiode outputs in DWDM line cards. IC Role / Device Role / Timing Role: High-speed SAR ADC capturing transient events (e.g., laser turn-on spikes) with minimal conversion delay. Use Value: 47 MHz input bandwidth preserves signal integrity of fast optical control loops; GPIO alarm flags enable immediate hardware response to out-of-spec conditions. |
| Industrial Motor Drive Feedback | Digital Power Supply Telemetry |
|
Use Scenario: Sampling phase currents, DC bus voltage, and temperature sensors in servo drive for field-oriented control (FOC). IC Role / Device Role / Timing Role: Synchronized multi-channel acquisition triggered by PWM timer; manual mode enables precise channel selection per control cycle. Use Value: 12-bit resolution and 1 MSPS rate support <1% current measurement error at 20 kHz switching frequencies, meeting IEC 61800-3 requirements. |
Use Scenario: Monitoring input/output voltages, inductor current, and thermal sensors in digitally controlled AC/DC and DC/DC converters. IC Role / Device Role / Timing Role: ADC core in PMBus-compliant power management IC; alarms feed directly to fault-handling logic without MCU intervention. Use Value: Dual per-channel alarms reduce firmware polling load; 2.7–5.25 V analog supply enables direct use of 3.3 V system rail, eliminating auxiliary LDO. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7957SBRHBT | 10-bit resolution, identical 16-channel count, same RHB package and pinout; lower SNR (60 dB vs. 70 dB) and INL (±1.5 LSB vs. ±1 LSB). | Acceptable for cost-sensitive industrial monitoring where 10-bit resolution suffices (e.g., temperature, slow-varying voltage). | Select when 12-bit precision is unnecessary and BOM cost reduction is prioritized over dynamic range. |
| ADS8688IPWR | 16-bit, 8-channel, successive-approximation ADC; SPI interface, but requires external reference and lacks integrated alarms or GPIOs. | Better resolution for precision metrology, but fewer channels and no hardware alarm capability limits use in high-channel-count fault-tolerant systems. | Choose only if higher resolution outweighs loss of per-channel alarms and 16-channel density. |
Compared with ADS7957SBRHBT, ADS7953SBRHBT delivers 2-bit higher resolution and tighter INL for demanding control loops; versus ADS8688IPWR, it trades resolution for integrated alarms, GPIO flexibility, and double the channel count in the same footprint-making it optimal for scalable industrial I/O.
Availability
ADS7953SBRHBT is available at Aetrix Electronics and suitable for PLC analog input modules, optical line card monitoring, industrial motor drive feedback, digital power supply telemetry, and high-speed closed-loop systems requiring stable component supply across long production lifecycles.
Supply support for ADS7953SBRHBT 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, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.
The ADS79xx product line was designed specifically for high-channel-count, high-speed industrial data acquisition-emphasizing deterministic timing, integrated alarms, flexible power domains, and pin-compatible scalability across 8-/10-/12-bit resolutions.
FAQ
What is the maximum sample rate supported by the ADS7953SBRHBT?
The ADS7953SBRHBT supports a maximum sample rate of 1 MSPS (1 million samples per second) under recommended operating conditions. This rate is achievable with a 20-MHz SCLK and proper CS timing, enabling real-time capture of signals up to 500 kHz (per Nyquist). The ADS7953SBRHBT maintains full 12-bit performance at this rate, with zero latency ensuring immediate data availability after conversion completion.
Does the ADS7953SBRHBT require an external reference voltage?
Yes, the ADS7953SBRHBT requires an external reference voltage applied to REFP and REFM pins. It supports 2.5 V ±0.1 V references such as the REF5025, and the input range is programmable to either 0 to VREF or 0 to 2×VREF. The device does not include an internal reference; reference stability and noise directly impact overall ADC accuracy, so low-drift, low-noise sources are recommended.
How many GPIOs are available on the ADS7953SBRHBT, and what functions do they serve?
The ADS7953SBRHBT provides four individually configurable GPIOs (GPIO0–GPIO3) in its 32-pin VQFN (RHB) package. GPIO0 serves as the active-high alarm output, GPIO1 as the active-high low-alarm indicator, GPIO2 selects input range (high=2×VREF, low=VREF), and GPIO3 is an active-low power-down input. These are fully programmable via SPI register writes and do not require external pull-ups for default functionality.
Is the ADS7953SBRHBT pin-compatible with other devices in the ADS79xx family?
Yes, the ADS7953SBRHBT is pin-compatible with ADS7957SBRHBT (10-bit) and ADS7961SBRHBT (8-bit) in the same 32-pin VQFN (RHB) package. All three share identical pin assignments, power domains, and interface signaling-allowing hardware design reuse and simplified BOM management when resolution requirements change across product variants or generations.
What are the supported operating voltage ranges for analog and digital supplies on the ADS7953SBRHBT?
The ADS7953SBRHBT supports an analog supply (+VA) range of 2.7 V to 5.25 V and a digital I/O supply (+VBD) range of 1.7 V to 5.25 V. This dual-supply flexibility enables direct interfacing with 3.3 V or 5 V analog sensors and 1.8 V, 3.3 V, or 5 V microcontrollers without level-shifting. AGND and BDGND must be kept separate to maintain PSRR and avoid digital noise coupling into the analog conversion path.
ADS7953SBRHBT 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:
- 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:
- 32-VQFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7953SBRHBT FAQ
1.How can I place an order for ADS7953SBRHBT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7953SBRHBT 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 ADS7953SBRHBT reliable?
The price and inventory of ADS7953SBRHBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7953SBRHBT is usually 5 days.
3.What payment methods are accepted for ADS7953SBRHBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7953SBRHBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7953SBRHBT?
ADS7953SBRHBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7953SBRHBT 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 ADS7953SBRHBT?
For technical support, including ADS7953SBRHBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7953SBRHBT requirements.
6.How does Aetrix verify that ADS7953SBRHBT is sourced from the original manufacturer or authorized distributors?
All ADS7953SBRHBT 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 ADS7953SBRHBT meets industry standards.
7.What is the process for return or replacement of ADS7953SBRHBT?
All ADS7953SBRHBT units undergo pre-shipment inspection (PSI). If there is an issue with ADS7953SBRHBT, 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 ADS7953SBRHBT part is unused and in its original packaging.
Return procedure for ADS7953SBRHBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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