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Texas Instruments ADS7841PB
- Part No.:
- ADS7841PB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
ADS7841PB.pdf
- Description:
- IC ADC 12BIT SAR 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,435
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Product details
Overview
ADS7841PB from Texas Instruments is a 12-bit, 4-channel SAR analog-to-digital converter with synchronous serial interface, ±1 LSB INL/DNL accuracy, 200 kHz max throughput at +5V, and DIP-16 package. It supports single-ended or differential input configurations and operates from 2.7V to 5V supply, targeting battery-powered data acquisition systems.
For engineers reviewing the ADS7841PB datasheet, ADS7841PB pinout, ADS7841PB application, or ADS7841PB equivalent, key selection criteria include guaranteed no missing codes, 72 dB SINAD at 10 kHz, programmable 8/12-bit resolution, shutdown mode (<15 µW), and compatibility with isolated serial interfaces in remote sensing.
Technical Context
The ADS7841PB implements a capacitive redistribution SAR architecture with integrated sample-and-hold, enabling true simultaneous sampling across four analog inputs via an internal multiplexer. Its conversion timing is fully controlled by external DCLK (up to 3.2 MHz), and it uses a 24-clock cycle sequence for 12-bit conversions.
Digital control is delivered through an 8-bit serial command byte that configures channel selection (A2–A0), SGL/DIF mode, MODE bit, and power-down state (PD1/PD0). The MODE pin overrides the MODE bit: when LOW, all conversions are fixed at 12 bits; when HIGH, resolution is software-selectable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit (fixed when MODE = LOW); 8-bit option available when MODE = HIGH - enables faster throughput with reduced data width. |
| INL / DNL | ±1 LSB max (ADS7841PB grade) - ensures monotonicity and <0.025% full-scale linearity error at VREF = 5V. |
| Throughput Rate | 200 kHz at +5V / 125 kHz at +2.7V - defines maximum sampling frequency per channel in continuous mode. |
| SINAD | 72 dB at VIN = 5 Vp-p, 10 kHz - indicates usable dynamic range of ~11.9 ENOB under specified conditions. |
| Supply Range | 2.7 V to 5.25 V - supports direct interfacing with 3.3 V and 5 V logic domains without level-shifting. |
| Power Dissipation | 4.5 mW typical at 200 kHz / +5V; <15 µW in shutdown - enables multi-day operation in coin-cell–powered loggers. |
| Reference Range | 0.1 V to VCC - allows flexible input scaling (e.g., 0–2.5 V or 0–5 V) and supports low-voltage sensor outputs. |
Pinout & Package
DIP-16 package (N package drawing, 180 mil width), through-hole mountable, rated for –40°C to +85°C operation. Pin 1 marked with dot or notch; pins 1–8 on top row left-to-right, pins 9–16 on bottom row right-to-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VCC (Pins 1, 9) | Power supply input | Dual power pins reduce IR drop and improve PSRR; must be bypassed locally with 0.1 µF ceramic + 1–10 µF bulk capacitor. |
| CH0–CH3 (Pins 2–5) | Analog input channels | Four single-ended or two differential inputs; COM pin sets common-mode reference point for all channels. |
| COM (Pin 6) | Analog ground reference | Zero-code reference in single-ended mode; connects to system AGND or bias voltage to shift input range. |
| SHDN (Pin 7) | Hardware shutdown control | Active-low signal reduces quiescent current to <15 µW; asynchronous entry/exit with no conversion latency. |
| VREF (Pin 8) | External reference input | Unbuffered, current-sinking input (13 µA typ. at 2.5 V); LSB size = VREF / 4096 - directly scales measurement resolution. |
| GND (Pin 10) | Digital/analog ground | Single ground plane required; separation from noisy digital returns improves noise floor and THD performance. |
| MODE (Pin 11) | Resolution configuration | Hardware override: LOW forces 12-bit mode regardless of control byte; HIGH enables software-selectable 8/12-bit resolution. |
| DOUT (Pin 12) | Serial data output | High-impedance when CS = HIGH; outputs MSB-first straight-binary code synchronized to DCLK falling edge. |
| BUSY (Pin 13) | Conversion status indicator | Active-high open-drain output signals conversion progress; used for polling or interrupt-driven readout timing. |
| DIN (Pin 14) | Serial data input | Latches control byte on rising DCLK edge when CS = LOW; accepts start bit (S), A2–A0, MODE, SGL/DIF, PD1, PD0. |
| CS (Pin 15) | Chip select | Active-low enable for serial interface and conversion initiation; controls DOUT/BUSY driver enable timing. |
| DCLK (Pin 16) | External clock input | Drives SAR conversion and serial I/O timing; 16-cycle minimum per 12-bit conversion; max 3.2 MHz at +5V. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed no missing codes | Ensures monotonic transfer function across full 12-bit range - critical for closed-loop control and position feedback. |
| Programmable resolution (8/12-bit) | Reduces data bandwidth and processing load in host MCU; 8-bit mode achieves up to 2× higher effective throughput. |
| On-chip 4-channel multiplexer | Eliminates need for external analog switching ICs; supports time-multiplexed sampling of sensors, thermocouples, or potentiometers. |
| Low-power shutdown mode | Reduces supply current to <15 µW - extends battery life in intermittent-sampling applications like environmental monitors. |
| Flexible reference input (0.1 V to VCC) | Enables direct digitization of low-level sensor outputs (e.g., 100 mV strain gauge) without external gain stages. |
Applications
| Data Acquisition Systems | Test & Measurement Equipment |
|---|---|
Use Scenario: Multi-channel voltage logging in portable field instruments with limited power budget and space constraints. IC Role / Device Role / Timing Role: Primary ADC capturing analog sensor outputs (temperature, pressure, humidity) at up to 200 kSPS with serial output to microcontroller. Use Value: DIP-16 footprint simplifies prototyping; 2.7 V operation extends AA/AAA battery life; no missing codes ensures reliable threshold detection. | Use Scenario: Benchtop multimeter or oscilloscope front-end requiring accurate DC and AC measurements up to 10 kHz. IC Role / Device Role / Timing Role: High-fidelity digitizer for analog signal conditioning path, leveraging 72 dB SINAD and ±1 LSB linearity. Use Value: Straight-binary output simplifies firmware math; differential input mode rejects common-mode noise from probe grounds. |
| Industrial Process Control | Battery-Powered Portable Devices |
Use Scenario: PLC analog input module monitoring 4–20 mA transmitters and RTD bridges in factory automation. IC Role / Device Role / Timing Role: Isolated ADC interface converting conditioned current/voltage signals into digital values for real-time control loop execution. Use Value: Channel-to-channel isolation >100 dB prevents crosstalk between adjacent sensor inputs; COM pin flexibility supports 3-wire RTD wiring. | Use Scenario: Handheld medical device (e.g., ECG monitor) acquiring biopotential signals with ultra-low power consumption. IC Role / Device Role / Timing Role: Low-noise, low-power ADC digitizing amplified electrode signals while minimizing thermal dissipation near patient interface. Use Value: Shutdown mode draws <15 µW between samples; 12-bit resolution preserves diagnostic waveform fidelity at sub-mV levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog-to-digital converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7841P | Same DIP-16 package and –40°C to +85°C rating, but ±2 LSB INL/DNL (vs. ±1 LSB for ADS7841PB) | Suitable for cost-sensitive industrial monitoring where 12-bit monotonicity is sufficient but ±1 LSB linearity is not required | Select ADS7841P if absolute linearity tolerance can be relaxed to ±2 LSB without impacting system calibration stability |
| MAX1247ACPP+ | Pin-compatible 12-bit SAR ADC in 16-pin DIP; ±1 LSB INL/DNL; 133 kSPS max; requires external reference; no MODE pin | Designed for legacy designs migrating from MAXIM platform; lacks hardware resolution override and integrated multiplexer settling control | Choose MAX1247ACPP+ only when replacing existing MAX1247-based PCBs; ADS7841PB offers superior throughput and flexible reference range |
Compared with ADS7841P, the ADS7841PB delivers tighter linearity (±1 vs. ±2 LSB) for precision calibration-critical systems; compared with MAX1247ACPP+, it adds hardware resolution control and wider reference support (0.1 V to VCC), reducing external component count.
Availability
ADS7841PB is available at Aetrix Electronics and suitable for data acquisition systems, test equipment, and industrial process controllers requiring stable component supply over extended production lifecycles.
Supply support for ADS7841PB 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 series was designed for low-power, multi-channel sampling in portable and isolated measurement systems - emphasizing integration, flexibility, and robustness in harsh electrical environments.
FAQ
What is the operating temperature range for the ADS7841PB?
The ADS7841PB is specified for operation from –40°C to +85°C. This grade does not support the extended +125°C range offered by the ADS7841ES variant. All electrical characteristics in the datasheet (SBAS084B) for the PB grade are guaranteed within this industrial temperature span, including ±1 LSB INL/DNL and 200 kHz throughput at +5V.
Does the ADS7841PB require an external reference voltage?
Yes, the ADS7841PB requires an external reference voltage applied to the VREF pin. It accepts any stable voltage from 0.1 V to VCC (2.7 V to 5.25 V), and the full-scale input range is 0 V to VREF. The reference is unbuffered and draws ~13 µA at 2.5 V, so low-impedance sources (e.g., REF5025 or LM4040) are recommended for optimal accuracy and noise performance.
How does the MODE pin affect resolution selection in the ADS7841PB?
In the ADS7841PB, the MODE pin determines whether resolution is hardware- or software-controlled. When MODE = LOW, all conversions are forced to 12 bits regardless of the MODE bit in the control byte. When MODE = HIGH, the MODE bit selects 12-bit (LOW) or 8-bit (HIGH) resolution per conversion - enabling dynamic trade-offs between speed and precision in real-time firmware.
Can the ADS7841PB perform differential measurements?
Yes, the ADS7841PB supports true differential input mode using any two of CH0–CH3 as +IN and –IN, controlled by the SGL/DIF bit and A2–A0 channel select bits. In differential mode, the COM pin is ignored, and the input range is ±VREF/2. This configuration provides common-mode rejection and improved noise immunity for signals referenced to non-ground potentials.
What is the minimum acquisition time required before conversion starts in the ADS7841PB?
The ADS7841PB requires a minimum acquisition time of 900 ns at +5V (1.5 µs at +2.7V) after the multiplexer settles and before the sample-and-hold enters hold mode. This timing is embedded in the 24-clock conversion sequence and is satisfied automatically when using the standard serial interface protocol - no additional delay is needed in firmware if DCLK timing meets datasheet specifications.
ADS7841PB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
ADS7841PB FAQ
1.How can I place an order for ADS7841PB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7841PB 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 ADS7841PB reliable?
The price and inventory of ADS7841PB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7841PB is usually 5 days.
3.What payment methods are accepted for ADS7841PB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7841PB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7841PB?
ADS7841PB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7841PB 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 ADS7841PB?
For technical support, including ADS7841PB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7841PB requirements.
6.How does Aetrix verify that ADS7841PB is sourced from the original manufacturer or authorized distributors?
All ADS7841PB 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 ADS7841PB meets industry standards.
7.What is the process for return or replacement of ADS7841PB?
All ADS7841PB units undergo pre-shipment inspection (PSI). If there is an issue with ADS7841PB, 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 ADS7841PB part is unused and in its original packaging.
Return procedure for ADS7841PB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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