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Texas Instruments ADS7844N/1KG4
- Part No.:
- ADS7844N/1KG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
ADS7844N/1KG4.pdf
- Description:
- IC ADC 12BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,946
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Product details
Overview
ADS7844N/1KG4 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 ADS7844N/1KG4 datasheet, ADS7844N/1KG4 pinout, ADS7844N/1KG4 application, or ADS7844N/1KG4 equivalent, key selection factors include its 20-lead SSOP package, CMOS-compatible serial interface (DIN/DOUT/BUSY/DCLK/CS), programmable power-down modes, and guaranteed operation over –40°C to +85°C.
Technical Context
The ADS7844N/1KG4 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 routing via SGL/DIF and A2–A0 control bits transmitted serially on DIN.
Digital timing is synchronous: conversion requires 16 clock cycles (or 15/24 for alternate modes), with BUSY active during acquisition and conversion, and DOUT valid on DCLK falling edge. Reference input (VREF) sets full-scale range (0.1 V to VCC) and directly determines LSB size (e.g., 1.22 mV at 5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with no missing codes guaranteed. |
| INL / DNL | ±1 LSB max - ensures monotonicity and ≤0.024% full-scale linearity error at 5 V reference. |
| Throughput Rate | 200 kHz max at +5 V - enables real-time sampling of signals up to ~99 kHz (Nyquist-limited). |
| SINAD | 72 dB at 10 kHz - corresponds to ~11.9 effective number of bits (ENOB) for high-fidelity signal capture. |
| Supply Range | 2.7 V to 5 V - supports direct interfacing with 3.3 V and 5 V logic systems without level shifting. |
| Power Dissipation | 4.5 mW typical at 200 kHz / +5 V - enables use in thermally constrained portable designs. |
| Operating Temp | –40°C to +85°C - qualified for industrial and extended-temperature embedded applications. |
Pinout & Package
ADS7844N/1KG4 is packaged in a 20-lead SSOP (Small Outline Package) with 0.65 mm lead pitch, RoHS-compliant, and rated for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 | Analog input channels | Eight single-ended or four differential input pairs; selected via A2–A0 and SGL/DIF bits. |
| COM | Analog ground reference | Sets zero-code voltage in single-ended mode; must be connected to system ground or stable reference point. |
| SHDN | Hardware shutdown control | Pulling low disables internal circuitry, reducing supply current to <1 µW - critical for ultra-low-power sleep states. |
| VREF | External reference input | Unbuffered input accepting 0.1 V to VCC; defines full-scale span and LSB weight (e.g., 610 µV at 2.5 V). |
| +VCC (Pins 12 & 20) | Positive supply | Dual power pins reduce IR drop and improve PSRR; accepts 2.7–5 V with 550–900 µA quiescent current. |
| GND (Pins 13 & 14) | Analog/digital ground | Separate ground pins minimize noise coupling between analog and digital sections. |
| DOUT | Serial data output | High-impedance when CS is high; outputs 12-bit straight-binary result MSB-first on DCLK falling edge. |
| BUSY | Conversion status indicator | Active-low open-drain output signaling acquisition/conversion in progress; enables precise timing synchronization. |
| DIN | Serial command input | Latches 8-bit control byte (S/A2/A1/A0/–/SGL-DIF/PD1/PD0) on DCLK rising edge when CS is low. |
| CS | Chip select | Active-low enable; must be held low for entire 16-clock conversion sequence; disables DOUT/BUSY when high. |
| DCLK | Serial clock input | Master clock determining sample rate: fCLK = 16 × fSAMPLE; tolerant to 5.5 V regardless of VCC. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel analog multiplexer | Enables flexible signal routing - supports 8 single-ended or 4 differential inputs without external switching hardware. |
| Configurable power-down modes | PD1/PD0 bits allow auto power-down between conversions (reducing average current) or forced shutdown via SHDN pin. |
| CMOS-compatible serial interface | Eliminates need for level shifters when interfacing with 3.3 V or 5 V microcontrollers; includes BUSY for non-blocking reads. |
| Wide reference voltage range | VREF adjustable from 0.1 V to VCC allows optimization of dynamic range and resolution for low-voltage sensor interfaces. |
| Guaranteed monotonicity | No missing codes across full temperature range ensures reliable control-loop feedback and calibration integrity. |
Applications
| Portable Data Logger | Industrial Sensor Hub |
|---|---|
Use Scenario: Simultaneous monitoring of 8 temperature, pressure, and humidity sensors in handheld field instruments. IC Role / Device Role / Timing Role: 12-bit ADC digitizing multiplexed analog sensor outputs with synchronized serial readout to an ARM Cortex-M4 MCU. Use Value: Low 3 mW power at 200 kHz enables >24-hour battery life; 72 dB SINAD preserves signal fidelity for calibrated measurements. | Use Scenario: Centralized acquisition node collecting analog signals from distributed RTDs, strain gauges, and 4–20 mA transmitters in factory automation. IC Role / Device Role / Timing Role: High-accuracy SAR ADC providing isolated, multi-channel digitization with programmable reference scaling per channel group. Use Value: ±1 LSB INL ensures traceable metrology-grade readings; –40°C to +85°C rating supports uncontrolled cabinet environments. |
| Battery-Powered Medical Monitor | Test & Measurement Front-End |
Use Scenario: Wearable ECG/EMG device acquiring biopotential signals with minimal power and high SNR. IC Role / Device Role / Timing Role: Low-noise 12-bit ADC operating in differential mode (CH0–CH1, CH2–CH3) to reject common-mode interference. Use Value: 125 kHz throughput at 2.7 V meets clinical sampling requirements while consuming only 1.8 mW - extends coin-cell lifetime. | Use Scenario: Benchtop multimeter or oscilloscope auxiliary channel capturing transient waveforms with post-processing capability. IC Role / Device Role / Timing Role: Precision ADC feeding FPGA-based decimation filter and FFT engine via synchronous serial link. Use Value: Straight-binary output format simplifies FPGA logic; 100 dB channel-to-channel isolation prevents crosstalk in multi-signal analysis. |
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 |
|---|---|---|---|
| MAX147ACPP+ | Pin-compatible 12-bit 8-channel SAR ADC; same 20-pin SSOP package; ±1 LSB INL; 133 kSPS max; requires external reference. | Lower max throughput (133 vs 200 kHz); no SHDN pin - power management relies solely on CS and internal PD bits. | Select MAX147ACPP+ when legacy board reuse is required and 133 kSPS suffices; verify reference drive capability matches VREF current spec (≤40 µA). |
| ADS7841U | Same TI family; 12-bit, 4-channel (not 8-channel); QSOP-16 package; identical serial protocol and timing; ±1 LSB INL; 200 kHz throughput. | Fewer input channels and smaller package - suitable where channel count and board space are constrained, but not a drop-in replacement for 8-channel needs. | Choose ADS7841U for space-constrained designs needing only 4 channels; avoid if existing layout depends on 20-pin SSOP footprint or 8-channel routing. |
Compared with MAX147ACPP+, ADS7844N/1KG4 offers higher throughput and dedicated SHDN control; compared with ADS7841U, it provides double the channel count and larger package for thermal/power margin - both alternatives require PCB or firmware adaptation.
Availability
ADS7844N/1KG4 is available at Aetrix Electronics and suitable for portable medical monitors, industrial sensor hubs, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for ADS7844N/1KG4 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 expertise in precision data converters and industrial-grade ICs.
The ADS7844N/1KG4 belongs to TI's precision SAR ADC product line, designed specifically for low-power, multi-channel data acquisition in portable and embedded instrumentation where accuracy, integration, and supply flexibility are critical.
FAQ
What is the maximum sample rate of the ADS7844N/1KG4 at 2.7 V supply?
The ADS7844N/1KG4 achieves a maximum throughput rate of 125 kHz when operated at +2.7 V supply, VREF = +2.5 V, and fCLK = 2 MHz. This is specified in the SBAS100A datasheet Section "SPECIFICATION: +2.7V" and reflects reduced clock speed and settling constraints at lower supply voltage. At +5 V, the ADS7844N/1KG4 supports up to 200 kHz.
Does the ADS7844N/1KG4 support true differential input mode?
Yes, the ADS7844N/1KG4 supports true differential input mode using four of its eight channels (e.g., CH0–CH1, CH2–CH3, etc.) as paired +IN/–IN inputs. Configuration is controlled by the SGL/DIF bit and A2–A0 address bits in the serial control byte. In this mode, the COM pin is not used as reference, and common-mode rejection is enabled per Table II in the ADS7844N/1KG4 datasheet.
What is the function of the BUSY pin on the ADS7844N/1KG4?
On the ADS7844N/1KG4, the BUSY pin is an active-low, open-drain output that goes low during analog acquisition and conversion phases. It remains low for exactly 12 clock cycles after the control byte is latched, signaling when valid data is ready on DOUT. BUSY enables interrupt-driven or polling-based readout without fixed delay timing, improving system efficiency.
Can the ADS7844N/1KG4 operate with a 1.25 V reference voltage?
Yes, the ADS7844N/1KG4 accepts VREF from 0.1 V to +VCC, so a 1.25 V reference is fully supported. However, LSB size becomes 305 µV (1.25 V / 4096), increasing sensitivity to noise and offset errors. The datasheet cautions that noise may cause code dithering below ~100 mV VREF; at 1.25 V, stable 12-bit performance is achievable with proper layout and low-noise sources.
How does the SHDN pin interact with the internal PD1/PD0 power-down settings on the ADS7844N/1KG4?
The SHDN pin on the ADS7844N/1KG4 forces immediate hardware shutdown (<1 µW), overriding all PD1/PD0 settings. When SHDN is high, PD1/PD0 control auto power-down behavior between conversions. When SHDN is pulled low, the device enters deep shutdown regardless of PD bits - and resumes full operation within microseconds of SHDN returning high, with the first conversion valid.
ADS7844N/1KG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -
ADS7844N/1KG4 FAQ
1.How can I place an order for ADS7844N/1KG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7844N/1KG4 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/1KG4 reliable?
The price and inventory of ADS7844N/1KG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7844N/1KG4 is usually 5 days.
3.What payment methods are accepted for ADS7844N/1KG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7844N/1KG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7844N/1KG4?
ADS7844N/1KG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7844N/1KG4 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/1KG4?
For technical support, including ADS7844N/1KG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7844N/1KG4 requirements.
6.How does Aetrix verify that ADS7844N/1KG4 is sourced from the original manufacturer or authorized distributors?
All ADS7844N/1KG4 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/1KG4 meets industry standards.
7.What is the process for return or replacement of ADS7844N/1KG4?
All ADS7844N/1KG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7844N/1KG4, 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/1KG4 part is unused and in its original packaging.
Return procedure for ADS7844N/1KG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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