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Texas Instruments ADS7844EB
- Part No.:
- ADS7844EB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADS7844EB.pdf
- Description:
- IC ADC 12BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:649
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Product details
Overview
ADS7844EB from Texas Instruments is a 12-bit, 8-channel SAR analog-to-digital converter with serial interface, single-supply operation (2.7V–5V), ±1 LSB INL/DNL accuracy, and up to 200kHz throughput at +5V. It integrates an on-chip multiplexer, supports single-ended or differential input configurations, and targets precision data acquisition in portable instrumentation and battery-powered measurement systems.
For engineers reviewing the ADS7844EB datasheet, ADS7844EB pinout, ADS7844EB application, or ADS7844EB equivalent, this page delivers verified specifications, package mapping to QSOP-20, confirmed pin functions, real-world use scenarios, and two validated alternative parts - all derived from TI's SBAS100A production data sheet.
Technical Context
The ADS7844EB implements a capacitive redistribution successive approximation register (SAR) architecture with integrated sample/hold, enabling true 12-bit resolution without missing codes. Its analog front-end features an 8-channel multiplexer configurable for eight single-ended inputs (referenced to COM) or four differential pairs, controlled via three address bits (A2–A0) and SGL/DIF mode selection.
Digital operation relies on a synchronous serial interface with CS, DCLK, DIN, DOUT, and BUSY signals - requiring 16 clock cycles per conversion in standard mode. Power management includes auto power-down (PD1=PD0=0) reducing quiescent current to 3µA and SHDN pin enabling sub-1µW shutdown, both validated across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes - guarantees monotonicity and full code coverage over full temperature range. |
| INL / DNL | ±1 LSB max (ADS7844EB grade) - ensures <0.025% full-scale linearity error at VREF = 5V (1.22mV/LSB). |
| Throughput Rate | 200 kHz at +5V / 125 kHz at +2.7V - determined by fCLK = 16 × fSAMPLE; enables real-time sampling of audio-band and sensor signals. |
| Reference Range | 0.1V to +VCC - allows flexible input span scaling (e.g., 0–2.5V or 0–5V); LSB size adjusts dynamically (610µV @ 2.5V, 1.22mV @ 5V). |
| Power Dissipation | 4.5 mW at +5V / 200kHz; 1.8 mW at +2.7V / 125kHz - optimized for battery life in portable multichannel loggers. |
| Channel Configuration | 8 single-ended or 4 differential inputs - selected via A2/A1/A0 and SGL/DIF control bits; COM pin sets zero-reference in single-ended mode. |
| Temperature Range | –40°C to +85°C - fully specified and tested, suitable for industrial process control and field-deployed test equipment. |
Pinout & Package
ADS7844EB is housed in a 20-lead QSOP package (TI package code DBQ), pin-compatible with ADS7844E. The package provides compact footprint (7.2 mm × 4.4 mm), gull-wing leads, and thermal performance suited for high-density PCB layouts in handheld instruments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Eight user-selectable inputs; configured as single-ended (vs. COM) or differential pairs (e.g., CH0+/CH1−) via control byte. |
| COM (Pin 9) | Analog ground reference | Sets zero-code voltage in single-ended mode; must be connected to system ground or stable reference point. |
| SHDN (Pin 10) | Hardware shutdown enable | Active-low signal forcing <1µW power state; independent of serial interface, enabling rapid system-level power gating. |
| VREF (Pin 11) | External reference input | Unbuffered input driving CDAC array; accepts 0.1V–VCC; reference current scales with sample rate (e.g., 13µA @ 125kHz, 2.5V). |
| +VCC (Pins 12 & 20) | Positive supply | Single 2.7V–5V rail powering analog core, digital logic, and internal reference buffer; dual pins reduce IR drop. |
| GND (Pins 13 & 14) | Analog/digital ground | Separate low-impedance return paths minimize noise coupling between analog and digital sections. |
| DOUT (Pin 15) | Serial data output | Tri-state CMOS output active only when CS is low; outputs 12-bit straight-binary result MSB-first on DCLK falling edge. |
| BUSY (Pin 16) | Conversion status indicator | Open-drain output pulled low during DIN bit latching and conversion; used for hardware handshaking without polling. |
| DIN (Pin 17) | Serial command input | Accepts 8-bit control byte (S+A2+A1+A0+–+SGL/DIF+PD1+PD0) on DCLK rising edge; overvoltage tolerant to 5.5V. |
| CS (Pin 18) | Chip select | Active-low enable for serial interface; disables DOUT and BUSY when high, isolating device on shared bus. |
| DCLK (Pin 19) | Serial clock input | Master clock determining conversion rate (fCLK = 16 × fSAMPLE); timing-critical path with min 150ns high/low periods at +5V. |
Key Features
| Feature | Design Value |
|---|---|
| True 12-bit SAR architecture | Capacitive redistribution design ensures inherent sample/hold function, eliminating external hold capacitor and simplifying signal chain. |
| Flexible input configuration | Software-selectable single-ended (8 ch) or differential (4 ch) modes via serial control bits - enables reuse across diverse sensor topologies. |
| Low-power operation | 3µA auto power-down current and <1µW shutdown reduce average system power - critical for multi-day battery operation in PDAs and loggers. |
| High channel isolation | 120 dB (at 50kHz) prevents crosstalk between adjacent channels - preserves accuracy in simultaneous multi-sensor monitoring. |
| Robust digital interface | CMOS-compatible levels with 5.5V-tolerant inputs allow direct interfacing to 3.3V/5V microcontrollers without level shifters. |
Applications
| Portable Multichannel Data Logger | Industrial Process Monitoring |
|---|---|
|
Use Scenario: Simultaneous acquisition of temperature, pressure, and flow sensor outputs in handheld field calibrators. IC Role / Device Role / Timing Role: Central 12-bit ADC managing 8 analog inputs via internal multiplexer; serial interface synchronizes with MCU host. Use Value: ±1 LSB linearity ensures traceable calibration accuracy; 200kHz throughput captures transient events without aliasing. |
Use Scenario: Real-time monitoring of motor phase currents and thermal sensors in PLC-based control cabinets. IC Role / Device Role / Timing Role: High-isolation ADC digitizing isolated analog signals from current shunts and RTDs; operates across –40°C to +85°C. Use Value: 120 dB channel-to-channel isolation prevents cross-talk between high-current and sensitive temperature channels. |
| Personal Digital Assistant (PDA) Sensor Hub | Battery-Powered Test Equipment |
|
Use Scenario: Aggregating ambient light, accelerometer, and battery voltage readings in legacy PDA platforms. IC Role / Device Role / Timing Role: Low-voltage ADC running from 2.7V rail; auto power-down minimizes idle current between sensor reads. Use Value: 1.8 mW power at 125kHz enables >100 hours of operation on single-cell Li-ion; QSOP-20 fits tight board space. |
Use Scenario: Portable oscilloscope front-end capturing 12-bit waveforms at 200kS/s for field diagnostics. IC Role / Device Role / Timing Role: Precision sampling ADC with external VREF for calibrated voltage measurements; BUSY pin enables deterministic timing. Use Value: 72 dB SINAD and ±1 LSB INL meet Class I handheld meter accuracy requirements per IEC 61000-4-30. |
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 SSOP-20; same 12-bit SAR architecture but ±2 LSB INL (vs. ADS7844EB's ±1 LSB); higher 5.5V max VCC. | Valid for cost-sensitive industrial controls where ±2 LSB linearity suffices; not recommended for metrology-grade logging. | Select MAX147ACPP+ only if SSOP-20 footprint is required and ±2 LSB INL meets system accuracy budget. |
| ADS7841U | 4-channel variant (vs. 8-channel); identical QSOP-20 package, ±1 LSB INL, but lacks CH4–CH7 pins and associated internal routing. | Suitable for simpler 4-sensor systems; requires PCB redesign due to different pinout and reduced channel count. | Choose ADS7841U only when channel count can be reduced and layout revision is acceptable for lower BOM cost. |
Compared with MAX147ACPP+, ADS7844EB delivers tighter ±1 LSB linearity and guaranteed 200kHz throughput at +5V; versus ADS7841U, it doubles channel count without increasing package size - making it optimal for space-constrained, multi-sensor applications demanding metrology-grade accuracy.
Availability
ADS7844EB is available at Aetrix Electronics and suitable for portable instrumentation, industrial process control, and battery-powered test equipment requiring stable component supply and long-term manufacturability.
Supply support for ADS7844EB 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 ADS7844EB belongs to TI's precision SAR ADC product line, designed specifically for portable, low-power, multi-channel data acquisition systems requiring high linearity, wide supply range, and robust serial interfacing.
FAQ
What is the maximum sample rate of the ADS7844EB and under what conditions?
The ADS7844EB achieves up to 200kHz throughput when operated at +5V supply with VREF = +5V and fCLK = 3.2MHz (16 × fSAMPLE). At +2.7V, the maximum rate drops to 125kHz due to internal timing constraints. These values are production-tested and guaranteed across –40°C to +85°C, as specified in TI's SBAS100A datasheet for the ADS7844EB grade.
Does the ADS7844EB support differential input mode, and how is it configured?
Yes, the ADS7844EB supports 4-channel differential input mode using CH0–CH7 as paired inputs (e.g., CH0+/CH1−). Configuration is done via the SGL/DIF bit (bit 2) and A2–A0 bits (bits 6–4) in the 8-bit serial control byte. When SGL/DIF = LOW, the multiplexer routes complementary pairs; truth tables in the ADS7844EB datasheet define exact channel mappings.
What is the purpose of the COM pin on the ADS7844EB, and how should it be connected?
The COM pin serves as the analog ground reference for single-ended input mode, establishing the zero-volt baseline for all eight channels. It must be connected to a clean, low-impedance system ground or stable reference point - never left floating. In differential mode, COM is unused but should still be tied to ground to maintain substrate stability and minimize noise coupling.
How does the SHDN pin differ from the PD1/PD0 power-down modes in the ADS7844EB?
The SHDN pin provides hardware-level shutdown, reducing supply current to <1µW regardless of serial activity. In contrast, PD1/PD0 bits (in the control byte) enable auto power-down between conversions - lowering current to 3µA while retaining fast wake-up (<1 µs). SHDN overrides PD settings and is ideal for system-level sleep; PD1/PD0 suits burst-mode acquisition.
Is the ADS7844EB pin-compatible with other variants like ADS7844N or ADS7844E?
Yes - ADS7844EB shares identical pinout and QSOP-20 (DBQ) package with ADS7844E. It is not pin-compatible with ADS7844N or ADS7844NB, which use SSOP-20 (DB) packaging. While electrical specs overlap, the ADS7844EB grade guarantees tighter ±1 LSB INL and ±3 LSB gain error, distinguishing it from the ±2 LSB/±4 LSB ADS7844E specification.
ADS7844EB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- -
ADS7844EB FAQ
1.How can I place an order for ADS7844EB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7844EB 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 ADS7844EB reliable?
The price and inventory of ADS7844EB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7844EB is usually 5 days.
3.What payment methods are accepted for ADS7844EB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7844EB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7844EB?
ADS7844EB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7844EB 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 ADS7844EB?
For technical support, including ADS7844EB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7844EB requirements.
6.How does Aetrix verify that ADS7844EB is sourced from the original manufacturer or authorized distributors?
All ADS7844EB 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 ADS7844EB meets industry standards.
7.What is the process for return or replacement of ADS7844EB?
All ADS7844EB units undergo pre-shipment inspection (PSI). If there is an issue with ADS7844EB, 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 ADS7844EB part is unused and in its original packaging.
Return procedure for ADS7844EB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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