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Texas Instruments ADS7844NBG4
- Part No.:
- ADS7844NBG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ADS7844NBG4.pdf
- Description:
- IC ADC 12BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,845
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Product details
Overview
ADS7844NBG4 from Texas Instruments is a 12-bit, 8-channel SAR analog-to-digital converter with synchronous serial interface, ±1 LSB INL/DNL, 72 dB SINAD, and 200 kHz max throughput at +5 V. It supports single-ended (8-channel) or differential (4-channel) inputs, operates from 2.7 V to 5 V, and features shutdown mode (<1 µW). It is used in portable multichannel data loggers and battery-powered measurement equipment.
For engineers reviewing the ADS7844NBG4 datasheet, ADS7844NBG4 pinout, ADS7844NBG4 application, or ADS7844NBG4 equivalent, key selection considerations include its 20-lead SSOP package, CMOS-compatible serial interface (DIN/DOUT/BUSY/DCLK/CS), channel configuration flexibility (SGL/DIF control), and reference voltage range (0.1 V to VCC).
Technical Context
The ADS7844NBG4 implements a capacitive redistribution successive approximation register (SAR) architecture with integrated sample-and-hold. Its eight-channel analog multiplexer supports configurable single-ended or differential input modes via SGL/DIF and A2–A0 control bits transmitted serially over DIN.
Digital timing is synchronous to DCLK, requiring 16 clock cycles per conversion (extendable to 24 for full control byte + result readout). Conversion is initiated by CS low, with BUSY indicating acquisition/conversion status and DOUT providing straight-binary output on DCLK falling edges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal digitization |
| Input Channels | 8 single-ended or 4 differential - enables flexible sensor interfacing without external mux |
| Max Throughput Rate | 200 kHz at +5 V - supports real-time sampling of fast-changing industrial or audio-band signals |
| INL / DNL | ±1 LSB max - ensures monotonicity and accurate code transition boundaries across full scale |
| SINAD | 72 dB - corresponds to ~11.6 effective number of bits (ENOB) at 10 kHz input |
| Supply Range | 2.7 V to 5 V - compatible with both Li-ion battery systems and standard 3.3 V/5 V logic rails |
| Power-Down Current | <1 µW - extends battery life in intermittent-sampling applications like environmental monitors |
Pinout & Package
The ADS7844NBG4 is housed in a 20-lead SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, optimized for compact PCB layouts in portable instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 | Analog input channels | Eight independent analog inputs selectable via A2–A0 and SGL/DIF bits; support single-ended (vs COM) or differential (pairwise) configurations |
| COM | Analog ground reference | Sets zero-code voltage in single-ended mode; must be connected to system ground or stable reference point |
| SHDN | Shutdown control | Active-low input that reduces supply current to <1 µW; no wake-up delay - first conversion is valid |
| VREF | External reference input | Defines full-scale input span (0 V to VREF); accepts 0.1 V to VCC; unbuffered, so requires low-impedance source |
| +VCC, GND (×2) | Power supply terminals | Dual GND pins reduce ground bounce; +VCC supplies internal logic and analog circuitry (2.7–5 V) |
| DOUT | Serial data output | Three-state CMOS output; driven only when CS is low; data valid on DCLK falling edge |
| BUSY | Conversion status indicator | Active-low open-drain output signaling acquisition or conversion in progress; high-impedance when CS = high |
| DIN | Serial command input | Latches control byte (S, A2–A0, SGL/DIF, PD1/PD0) on DCLK rising edge when CS = low |
| CS | Chip select | Active-low enable; gates all digital I/O; DOUT and BUSY go high-impedance when CS = high |
| DCLK | Serial clock input | Master clock determining conversion rate: fCLK = 16 × fSAMPLE; tolerant to 5.5 V regardless of +VCC |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | 2.7 V to 5 V - eliminates need for dual-rail supplies in mixed-signal portable designs |
| No missing codes | Guaranteed over full temperature range (–40°C to +85°C) - ensures reliable data capture without code gaps |
| Channel-to-channel isolation | 120 dB at 50 kHz - minimizes crosstalk in simultaneous multi-sensor monitoring |
| Flexible reference scaling | VREF adjustable from 0.1 V to VCC - enables optimization of dynamic range for low-level sensor outputs |
| Low-noise performance | 72 dB SINAD and 30 µVrms noise - supports precision measurement of mV-level transducer signals |
Applications
| Data Acquisition Systems | Portable Test Equipment |
|---|---|
Use Scenario: Multichannel voltage logging in field-deployable environmental sensors measuring temperature, humidity, and pressure. IC Role / Device Role / Timing Role: ADC front-end converting up to eight analog sensor outputs into digital data for microcontroller processing and wireless transmission. Use Value: 12-bit resolution and ±1 LSB linearity ensure accurate calibration traceability; 200 kHz throughput allows oversampling to improve SNR in noisy outdoor environments. | Use Scenario: Handheld oscilloscope or multimeter capturing time-domain waveforms or RMS values from multiple probes. IC Role / Device Role / Timing Role: High-fidelity analog digitizer with configurable input modes supporting both single-ended probe inputs and differential floating measurements. Use Value: 72 dB SINAD and 120 dB channel isolation preserve signal integrity during concurrent multi-channel sampling; low power-down current extends battery runtime between calibrations. |
| Industrial Process Monitoring | Battery-Powered Medical Devices |
Use Scenario: PLC I/O module acquiring analog feedback from flow meters, valve positioners, and thermal sensors in factory automation. IC Role / Device Role / Timing Role: Precision ADC interfacing with 4–20 mA current loops and RTD bridges via external signal conditioning. Use Value: Wide VREF range (0.1 V to VCC) accommodates diverse sensor output spans; robust ESD protection and –40°C to +85°C rating ensure reliability in harsh plant-floor conditions. | Use Scenario: Wearable vital-sign monitor acquiring ECG, SpO₂, and skin temperature from low-power analog front-ends. IC Role / Device Role / Timing Role: Low-power, high-accuracy ADC enabling continuous physiological waveform digitization while minimizing energy consumption. Use Value: <1 µW shutdown current and 2.7 V minimum supply allow direct integration with coin-cell or rechargeable LiPo batteries; straight-binary output simplifies firmware parsing in resource-constrained MCUs. |
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 |
|---|---|---|---|
| ADS7844EB | Same functionality and pinout in QSOP-20 package; ±1 LSB INL spec guaranteed (vs ±2 LSB for NB grade) | Preferred where tighter INL is required for metrology-grade calibration; QSOP may ease hand-soldering or prototyping | Select ADS7844EB if ±1 LSB INL is mandatory and QSOP packaging is acceptable for your layout |
| MAX147ACPP+ | Pin-compatible 12-bit 8-channel SAR ADC; same SSOP-20 footprint; ±1 LSB INL; 133 kSPS max at +5 V | Lower max throughput than ADS7844NBG4 (200 kSPS); different serial protocol timing and control bit mapping | Choose MAX147ACPP+ only if legacy design compatibility or second-source assurance is prioritized over speed and TI ecosystem support |
Compared with ADS7844EB and MAX147ACPP+, the ADS7844NBG4 offers the highest throughput (200 kSPS) in its package class and maintains TI's production continuity, while MAX147ACPP+ trades speed for broader vendor availability and ADS7844EB provides tighter INL at the cost of different packaging.
Availability
ADS7844NBG4 is available at Aetrix Electronics and suitable for portable test equipment, industrial process monitoring, and battery-powered medical devices requiring stable component supply and long-term manufacturability.
Supply support for ADS7844NBG4 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 ADS7844 product line was designed for low-power, multi-channel data acquisition in portable and battery-operated instrumentation, emphasizing accuracy, serial interface simplicity, and wide supply voltage tolerance.
FAQ
What is the maximum sampling rate of the ADS7844NBG4?
The ADS7844NBG4 achieves a maximum throughput rate of 200 kHz at +5 V supply and 3.2 MHz DCLK frequency. At +2.7 V, the maximum rate drops to 125 kHz due to reduced internal switching speed. This rate assumes 16 clock cycles per conversion and accounts for acquisition, conversion, and settling times specified in the SBAS100A datasheet.
Does the ADS7844NBG4 support differential input mode?
Yes, the ADS7844NBG4 supports differential input mode using four of its eight channels (e.g., CH0/CH1, CH2/CH3, etc.) controlled by the SGL/DIF bit and A2–A0 address bits. In this mode, the device measures the voltage difference between two inputs, rejecting common-mode noise and improving SNR in electrically noisy environments.
What package type is used for the ADS7844NBG4?
The ADS7844NBG4 uses a 20-lead SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch. This package matches the MAX147 footprint and is distinct from the QSOP-20 variant (ADS7844EB), ensuring mechanical compatibility with existing SSOP-based PCB layouts.
How does the reference voltage affect ADC performance in the ADS7844NBG4?
In the ADS7844NBG4, VREF directly sets the full-scale input range (0 V to VREF) and determines LSB size (VREF/4096). Lower VREF increases quantization error in LSB terms and amplifies offset/gain errors - e.g., a 2 LSB offset at 2.5 V becomes ~10 LSB at 0.5 V. Noise also becomes more apparent relative to LSB, requiring averaging or filtering for stable results.
Can the ADS7844NBG4 operate from a 3.3 V supply?
Yes, the ADS7844NBG4 is fully specified to operate from 2.7 V to 5 V, including 3.3 V nominal rails. At +3.3 V, it maintains 12-bit resolution, ±2 LSB INL, and supports up to ~160 kHz throughput (interpolated from +2.7 V and +5 V specs), with quiescent current of approximately 400 µA and power dissipation under 1.5 mW in active mode.
ADS7844NBG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 4, 8
- Input Type:
- Differential, 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 ~ 85°C
- Supplier Device Package:
- 20-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7844NBG4 FAQ
1.How can I place an order for ADS7844NBG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7844NBG4 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 ADS7844NBG4 reliable?
The price and inventory of ADS7844NBG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7844NBG4 is usually 5 days.
3.What payment methods are accepted for ADS7844NBG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7844NBG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7844NBG4?
ADS7844NBG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7844NBG4 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 ADS7844NBG4?
For technical support, including ADS7844NBG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7844NBG4 requirements.
6.How does Aetrix verify that ADS7844NBG4 is sourced from the original manufacturer or authorized distributors?
All ADS7844NBG4 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 ADS7844NBG4 meets industry standards.
7.What is the process for return or replacement of ADS7844NBG4?
All ADS7844NBG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7844NBG4, 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 ADS7844NBG4 part is unused and in its original packaging.
Return procedure for ADS7844NBG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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