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Texas Instruments ADS7841ESG4
- Part No.:
- ADS7841ESG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADS7841ESG4.pdf
- Description:
- IC ADC 12BIT SAR 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,564
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Product details
Overview
ADS7841ESG4 from Texas Instruments is a 12-bit, 4-channel SAR analog-to-digital converter with synchronous serial interface, ±1 LSB INL/DNL, 200 kHz max throughput at +5 V, and operation over –40°C to +125°C. It supports single-ended or differential input configurations and integrates an on-chip multiplexer for battery-powered data acquisition systems.
For engineers reviewing the ADS7841ESG4 datasheet, ADS7841ESG4 pinout, ADS7841ESG4 application, or ADS7841ESG4 equivalent, key selection factors include guaranteed 12-bit no-missing-codes performance across extended temperature, programmable 8/12-bit resolution via MODE pin or control byte, and SSOP-16 package compatibility with industrial sensor interfaces requiring low power and high channel density.
Technical Context
The ADS7841ESG4 implements a capacitive redistribution SAR architecture with integrated sample-and-hold, enabling true 12-bit linearity without external hold circuitry. Its analog front-end accepts four single-ended inputs referenced to COM or two differential pairs selected via A2–A0 and SGL/DIF bits.
Digital control uses a 24-clock (or 16-clock) synchronous serial protocol with start-bit–driven DIN framing, BUSY flag synchronization, and configurable power-down modes (PD1/PD0 bits). The MODE pin overrides software resolution control: LOW forces 12-bit conversion regardless of MODE bit state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes - ensures monotonic transfer function for precision measurement. |
| Throughput Rate | 200 kHz at +5 V - enables real-time sampling of fast transients in portable test equipment. |
| INL / DNL | ±1 LSB max - guarantees accurate code spacing and end-point linearity for calibration-critical applications. |
| Supply Range | 2.7 V to 5.25 V - supports direct integration with Li-ion battery rails and 3.3 V/5 V logic domains. |
| Temp Range | –40°C to +125°C - qualified for under-hood automotive sensors and industrial motor control feedback loops. |
| SINAD | 72 dB - provides >11.6 ENOB at 10 kHz input, suitable for medium-fidelity sensor digitization. |
| Reference Range | 100 mV to VCC - allows flexible full-scale scaling from low-voltage bridge outputs to rail-to-rail signals. |
Pinout & Package
ADS7841ESG4 is housed in a 16-pin SSOP (DBQ) package with 0.65 mm pitch, optimized for high-density PCB layouts and thermal reliability in extended-temperature environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VCC (Pins 1, 9) | Power supply input | Dual power pins reduce IR drop and improve PSRR; accepts 2.7–5.25 V for single-supply operation. |
| CH0–CH3 (Pins 2–5) | Analog input channels | Four independent inputs selectable as single-ended (vs COM) or differential pairs (e.g., CH0–CH1). |
| COM (Pin 6) | Analog ground reference | Sets zero-code voltage in single-ended mode; may be biased above ground for offset input ranges. |
| SHDN (Pin 7) | Hardware shutdown control | Active-low signal reduces quiescent current to <15 µW - critical for ultra-low-power wake-on-event systems. |
| VREF (Pin 8) | External reference input | Unbuffered input driving CDAC array; current scales with sample rate (e.g., ~13 µA at 125 kHz). |
| GND (Pin 10) | Digital/analog common ground | Single ground pin requires careful partitioning to avoid digital noise coupling into analog path. |
| MODE (Pin 11) | Hardware resolution select | LOW forces 12-bit conversion unconditionally; HIGH enables software-controlled 8/12-bit mode via control byte. |
| DOUT (Pin 12) | Serial data output | High-impedance when CS = HIGH - enables multi-drop bus sharing with tri-state isolation. |
| BUSY (Pin 13) | Conversion status flag | Active-high open-drain output synchronized to DCLK falling edge - eliminates need for polling delays. |
| DIN (Pin 14) | Serial data input | Latches control byte on rising DCLK edge; tolerant to 5.5 V inputs even at 2.7 V VCC. |
| CS (Pin 15) | Chip select | Edge-triggered enable for serial register access and conversion initiation - defines frame boundaries. |
| DCLK (Pin 16) | External clock input | Drives both SAR conversion timing and serial I/O; minimum pulse width 150 ns at 5 V. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable resolution (8/12-bit) | Reduces serial transfer time by 25% in 8-bit mode and allows 2× higher effective throughput with faster DCLK rates. |
| On-chip 4-channel multiplexer | Eliminates external analog switching components and associated settling errors in multi-sensor monitoring systems. |
| Auto power-down mode (PD1/PD0 = 00) | Cuts average supply current to ~3 µA between conversions - extends battery life in intermittent-sampling applications. |
| Flexible reference input (100 mV to VCC) | Enables direct digitization of low-level sensor outputs (e.g., 100 mV full-scale load cells) without gain amplification. |
| CMOS-compatible digital interface | Supports direct connection to microcontrollers with 3.3 V or 5 V I/O, including level-shift-free interfacing to FPGAs and ASICs. |
Applications
| Industrial Sensor Monitoring | Portable Data Logger |
|---|---|
Use Scenario: Continuous acquisition from four RTD or thermocouple channels in a PLC analog input module. IC Role / Device Role / Timing Role: 12-bit SAR ADC with integrated MUX performs synchronized sampling and serial reporting to host MCU every 5 ms. Use Value: ±1 LSB INL ensures calibrated accuracy across –40°C to +125°C ambient, eliminating per-unit firmware compensation. | Use Scenario: Battery-powered environmental logger capturing temperature, humidity, pressure, and light levels every 10 seconds. IC Role / Device Role / Timing Role: Low-power ADC enters auto power-down between samples and wakes on timer interrupt to digitize all four channels. Use Value: <15 µW shutdown current and 2.7 V operation extend AA battery life beyond 12 months. |
| Automotive Cabin Control | Medical Vital Sign Monitor |
Use Scenario: Occupant detection system using four capacitive proximity sensors behind dashboard trim. IC Role / Device Role / Timing Role: Differential-input ADC rejects common-mode EMI from ignition systems while digitizing small capacitance changes. Use Value: 120 dB channel-to-channel isolation prevents crosstalk between adjacent sensor inputs during simultaneous sampling. | Use Scenario: Handheld pulse oximeter acquiring analog signals from red/IR photodiodes and ambient light sensor. IC Role / Device Role / Timing Role: Single 12-bit conversion cycle reads all three channels in sequence via internal MUX before transmitting results over UART. Use Value: 72 dB SINAD meets IEC 60601-2-56 requirements for clinical-grade analog front-end SNR at 10 kHz bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7841EB | Same architecture and pinout; ±1 LSB INL/±3 LSB gain error vs ±2/±4 for ADS7841ESG4; rated only to +85°C. | Not suitable for under-hood or high-temp industrial enclosures requiring +125°C operation. | Select ADS7841EB only if cost sensitivity outweighs extended temperature qualification and tighter INL is required at commercial temp range. |
| MAX1247 | Pin-compatible 12-bit SAR ADC; identical 4-channel MUX and serial interface; ±1 LSB INL but lower 68 dB SINAD at 10 kHz. | Lower dynamic performance limits use in high-SNR medical or audio-adjacent sensing. | Choose MAX1247 only when legacy design reuse or Maxim's support ecosystem is prioritized over ADS7841ESG4's 72 dB SINAD and TI's long-term industrial availability. |
Compared with ADS7841EB and MAX1247, the ADS7841ESG4 delivers superior temperature robustness (+125°C), higher dynamic range (72 dB SINAD), and tighter gain matching (±4 LSB), making it the preferred choice for new designs demanding extended-range reliability and measurement fidelity.
Availability
ADS7841ESG4 is available at Aetrix Electronics and suitable for industrial sensor monitoring, portable data loggers, automotive cabin control, and medical vital sign monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADS7841ESG4 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 with decades of precision data converter heritage.
The ADS7841 product line targets low-power, multi-channel data acquisition in space-constrained and battery-operated systems, emphasizing integration, temperature resilience, and ease of microcontroller interfacing.
FAQ
What is the maximum operating temperature specification for the ADS7841ESG4?
The ADS7841ESG4 is specified for continuous operation from –40°C to +125°C, with full electrical performance guaranteed across this extended industrial temperature range. This rating applies exclusively to the ES grade variant, as confirmed in the SBAS084B datasheet Absolute Maximum Ratings table and Package/Ordering Information section. The ADS7841ESG4 achieves this via enhanced process screening and packaging validated for high-temperature reliability, distinguishing it from the standard E/P grades limited to +85°C.
Does the ADS7841ESG4 require an external reference voltage, and what is its acceptable range?
Yes, the ADS7841ESG4 requires an external reference voltage applied to the VREF pin, with a valid range of 100 mV to VCC (2.7 V to 5.25 V). This unbuffered reference directly sets the full-scale input span: for example, a 2.5 V reference yields 0.61 mV per LSB in 12-bit mode. The reference current varies with sample rate (e.g., ~13 µA at 125 kHz), and layout best practices-such as local 1 µF bypassing and separation from noisy digital traces-are essential to maintain accuracy, especially at lower reference voltages.
How does the MODE pin affect resolution configuration in the ADS7841ESG4?
The MODE pin on the ADS7841ESG4 provides hardware override of resolution selection: when MODE is held LOW, the device always performs 12-bit conversions regardless of the MODE bit value in the control byte. When MODE is HIGH, the MODE bit in the control byte determines resolution (LOW = 12-bit, HIGH = 8-bit). This dual-control scheme enables fixed-resolution operation for deterministic timing or dynamic resolution switching via software, enhancing flexibility in mixed-throughput systems without requiring pin reconfiguration.
Can the ADS7841ESG4 perform differential measurements, and how is the input configuration controlled?
Yes, the ADS7841ESG4 supports true differential measurements using any two of its four analog input channels (e.g., CH0–CH1 or CH2–CH3) by setting the SGL/DIF bit LOW in the control byte and selecting appropriate A2–A0 channel bits. In differential mode, the COM pin serves as the negative reference for single-ended inputs but is unused for differential pairs. The internal multiplexer routes the selected pair to the SAR core, delivering rejection of common-mode noise up to 120 dB at 50 kHz, as verified in the Electrical Characteristics table.
What power-saving modes does the ADS7841ESG4 support, and how are they activated?
The ADS7841ESG4 supports three power-saving states: (1) Auto power-down (PD1/PD0 = 00) reduces current to ~3 µA between conversions; (2) Hardware shutdown (SHDN = LOW) cuts quiescent current to <15 µW; and (3) Full power (PD1/PD0 = 11) maintains continuous operation. Activation is digital (via PD bits in control byte) or hardware-driven (SHDN pin), allowing flexible trade-offs between wakeup latency and energy efficiency-critical for battery-powered systems with irregular sampling intervals.
ADS7841ESG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 4
- 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 ~ 3.6V, 5V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V, 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 16-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7841ESG4 FAQ
1.How can I place an order for ADS7841ESG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7841ESG4 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 ADS7841ESG4 reliable?
The price and inventory of ADS7841ESG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7841ESG4 is usually 5 days.
3.What payment methods are accepted for ADS7841ESG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7841ESG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7841ESG4?
ADS7841ESG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7841ESG4 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 ADS7841ESG4?
For technical support, including ADS7841ESG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7841ESG4 requirements.
6.How does Aetrix verify that ADS7841ESG4 is sourced from the original manufacturer or authorized distributors?
All ADS7841ESG4 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 ADS7841ESG4 meets industry standards.
7.What is the process for return or replacement of ADS7841ESG4?
All ADS7841ESG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7841ESG4, 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 ADS7841ESG4 part is unused and in its original packaging.
Return procedure for ADS7841ESG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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