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Texas Instruments ADS7844N/1K
- Part No.:
- ADS7844N/1K
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ADS7844N/1K.pdf
- Description:
- IC ADC 12BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,445
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Product details
Overview
ADS7844N/1K from Texas Instruments is a 12-bit, 8-channel SAR analog-to-digital converter with synchronous serial interface, single-supply operation (2.7V–5V), ±1 LSB INL/DNL, and up to 200 kHz throughput at +5V - used in portable multichannel data loggers and battery-powered measurement equipment.
For engineers reviewing the ADS7844N/1K datasheet, ADS7844N/1K pinout, ADS7844N/1K application, or ADS7844N/1K equivalent, key selection factors include differential/single-ended input flexibility, 72 dB SINAD at 10 kHz, shutdown mode (<1 µW), 20-lead SSOP package, and compatibility with isolated serial acquisition systems.
Technical Context
The ADS7844N/1K implements a capacitive redistribution SAR architecture with integrated sample-and-hold, enabling true 12-bit no-missing-codes performance. It uses an external reference (100 mV to VCC) and external clock (fCLK = 16 × fSAMPLE), supporting both single-ended (8-channel) and differential (4-channel) configurations via programmable A2–A0 and SGL/DIF control bits.
Digital interface operates in 16-clock or 24-clock modes with CMOS-level signals, featuring active-low CS, DCLK-synchronized DIN/DOUT, BUSY flag, and SHDN pin for hardware power-down. Internal CDAC and comparator complete conversion in 12 clock cycles after acquisition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with guaranteed no missing codes - ensures monotonicity and full-scale linearity in precision measurement. |
| Input Channels | 8 single-ended or 4 differential inputs - enables flexible sensor multiplexing without external signal conditioning. |
| Throughput Rate | Up to 200 kHz at +5V (125 kHz at +2.7V) - supports real-time sampling of medium-bandwidth analog signals. |
| INL / DNL | ±1 LSB max (typical) - meets requirements for 12-bit accuracy in closed-loop control and calibration systems. |
| SINAD | 72 dB at 10 kHz - delivers >11.6 ENOB for high-fidelity signal digitization in test equipment. |
| Power Dissipation | 1.8 mW at +2.7V / 125 kHz; 4.5 mW at +5V / 200 kHz - enables multi-hour operation in coin-cell–powered devices. |
| Reference Range | 0.1 V to VCC - allows scalable input range tuning (e.g., 0–2.5 V or 0–5 V) without external amplifiers. |
Pinout & Package
ADS7844N/1K is housed in a 20-lead SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, RoHS-compliant, and rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 | Analog input channels | Eight configurable inputs; selected via A2–A0 and SGL/DIF bits for single-ended or differential acquisition. |
| COM | Analog ground reference | Sets zero-code voltage in single-ended mode; connects to system AGND or bias point. |
| SHDN | Hardware shutdown control | Active-low pin forcing <1 µW quiescent current - critical for ultra-low-power sleep states. |
| VREF | External reference input | Unbuffered, 100 mV–VCC range; determines full-scale span and LSB size (e.g., 1.22 mV at 5 V). |
| +VCC, GND | Power supply terminals | Dual +VCC pins (pins 12 & 20) and dual GND pins (13 & 14) reduce supply impedance and improve PSRR. |
| DOUT, DIN, DCLK, CS, BUSY | Serial interface signals | CMOS-compatible 3-wire SPI-like interface with busy indication - simplifies isolation and microcontroller interfacing. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | 2.7 V to 5 V - eliminates need for dual-rail supplies in portable instrumentation and embedded sensors. |
| Programmable input configuration | Software-selectable single-ended/differential mode per conversion - enables mixed-signal acquisition on one device. |
| Auto power-down mode | PD1=PD0=0 reduces average current between conversions - extends battery life without sacrificing first-conversion validity. |
| Channel-to-channel isolation | 120 dB at 50 kHz - prevents crosstalk in simultaneous multi-sensor monitoring (e.g., thermocouple + RTD arrays). |
| Low aperture jitter | 100 ps - preserves SNR in high-frequency sampling applications such as vibration analysis and audio front-ends. |
Applications
| Data Acquisition Systems | Portable Test Equipment |
|---|---|
Use Scenario: Simultaneous sampling of multiple voltage/current sensors in field-deployable environmental monitors. IC Role / Device Role / Timing Role: Central 12-bit ADC managing 8 analog inputs via internal multiplexer and serial command interface. Use Value: Reduces BOM count by eliminating external MUX and op-amp signal conditioning stages while maintaining ±1 LSB linearity. | Use Scenario: Handheld multimeter or oscilloscope probe interface requiring low-noise, battery-efficient digitization. IC Role / Device Role / Timing Role: Primary sampling engine with shutdown control synchronized to button press or auto-off timer. Use Value: 1.8 mW typical power at 2.7 V enables >100 hours of operation on two AA cells without compromising 72 dB SINAD. |
| Industrial Process Control | Battery-Powered Medical Devices |
Use Scenario: Analog feedback loop sampling in PLC I/O modules monitoring temperature, pressure, and flow transducers. IC Role / Device Role / Timing Role: High-accuracy ADC with COM-referenced inputs for ratiometric sensor interfaces and 4–20 mA loop receivers. Use Value: ±1 LSB INL ensures sub-0.025% full-scale error across –40°C to +85°C - meets SIL-2 functional safety margin requirements. | Use Scenario: Wearable ECG or glucose monitor acquiring biopotential signals with minimal power overhead. IC Role / Device Role / Timing Role: Low-noise, low-drift ADC operating in burst mode during sensor activation windows. Use Value: 72 dB SINAD at 10 kHz and 100 ps aperture jitter preserve diagnostic waveform fidelity while enabling >7-day battery life. |
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 |
|---|---|---|---|
| MAX147BCPP+ | Pin-compatible 12-bit 8-channel SAR ADC; identical SSOP-20 footprint and serial protocol; ±2 LSB INL (vs ±1 LSB for ADS7844N/1K) | Higher gain error (±12 LSB vs ±3 LSB); lower channel isolation (90 dB vs 120 dB) | Preferred where legacy MAX147 design reuse is required and ±2 LSB INL is acceptable. |
| ADS7841U | 4-channel variant in TSSOP-16; same core architecture and timing; 125 kHz max rate at +2.7 V; no SHDN pin | Lacks hardware shutdown and 4 extra analog inputs - unsuitable for 8-channel or ultra-low-power sleep use cases | Select when board space is constrained and only four channels are needed with identical performance per channel. |
Compared with MAX147BCPP+ and ADS7841U, ADS7844N/1K uniquely balances 8-channel flexibility, ±1 LSB linearity, hardware shutdown, and 200 kHz throughput - making it optimal for new designs prioritizing measurement fidelity and power-aware multiplexing.
Availability
ADS7844N/1K is available at Aetrix Electronics and suitable for portable data loggers, industrial sensor nodes, and handheld test equipment requiring stable component supply and long-term manufacturability.
Supply support for ADS7844N/1K 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 high-reliability ICs for industrial, automotive, and consumer applications.
The ADS7844 product line targets portable and battery-constrained measurement systems, delivering high-resolution SAR conversion with minimal external components and flexible power management.
FAQ
What is the maximum sample rate of the ADS7844N/1K at 2.7V supply?
The ADS7844N/1K achieves a maximum throughput rate of 125 kHz when operated at +2.7V supply, VREF = +2.5V, and fCLK = 2 MHz. This is specified over the full –40°C to +85°C temperature range and reflects the device's optimized low-voltage performance without derating.
Does the ADS7844N/1K support differential input mode, and how is it configured?
Yes, the ADS7844N/1K supports 4-channel differential input mode. It is configured by setting the SGL/DIF bit LOW in the 8-bit control byte and selecting channel pairs (e.g., CH0/CH4, CH1/CH5) using A2–A0 bits. The differential voltage is measured between +IN and –IN pins derived from the selected channels.
What is the function of the COM pin on the ADS7844N/1K?
The COM pin on the ADS7844N/1K serves as the analog ground reference for single-ended inputs. When tied to system AGND, it defines the 0-V level for all eight channels in single-ended mode. In differential mode, COM is unused but must remain connected to AGND per layout guidelines.
Can the ADS7844N/1K operate with a 100mV reference voltage, and what impact does that have?
Yes, the ADS7844N/1K supports VREF as low as 100 mV. At this level, LSB size is 24 µV, placing digitized output near the device's internal noise floor. Output codes will exhibit Gaussian distribution; stable readings require averaging or digital filtering - confirmed in TI SBAS100A Figure 7 notes.
How does the SHDN pin interact with the PD1/PD0 power-down bits in the ADS7844N/1K?
The SHDN pin provides hardware-level shutdown (<1 µW), overriding PD1/PD0 settings. When SHDN is LOW, the device enters immediate ultra-low-power state regardless of PD1/PD0 values. When SHDN is HIGH, PD1/PD0 control auto power-down behavior between conversions - verified in SBAS100A Section "POWER DISSIPATION".
ADS7844N/1K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -
ADS7844N/1K FAQ
1.How can I place an order for ADS7844N/1K through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7844N/1K 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 ADS7844N/1K reliable?
The price and inventory of ADS7844N/1K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7844N/1K is usually 5 days.
3.What payment methods are accepted for ADS7844N/1K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7844N/1K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7844N/1K?
ADS7844N/1K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7844N/1K 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 ADS7844N/1K?
For technical support, including ADS7844N/1K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7844N/1K requirements.
6.How does Aetrix verify that ADS7844N/1K is sourced from the original manufacturer or authorized distributors?
All ADS7844N/1K 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 ADS7844N/1K meets industry standards.
7.What is the process for return or replacement of ADS7844N/1K?
All ADS7844N/1K units undergo pre-shipment inspection (PSI). If there is an issue with ADS7844N/1K, 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 ADS7844N/1K part is unused and in its original packaging.
Return procedure for ADS7844N/1K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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