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Texas Instruments ADS7844E/2K5G4
- Part No.:
- ADS7844E/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADS7844E/2K5G4.pdf
- Description:
- IC ADC 12BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,811
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Product details
Overview
ADS7844E/2K5G4 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. It integrates an on-chip 8-channel multiplexer, supports single-ended or differential input configurations, and delivers 72 dB SINAD - ideal for portable multichannel data loggers requiring precision, low power, and compact footprint.
For engineers reviewing the ADS7844E/2K5G4 datasheet, ADS7844E/2K5G4 pinout, ADS7844E/2K5G4 application, or ADS7844E/2K5G4 equivalent, key selection criteria include guaranteed no missing codes, 20-lead QSOP package compatibility, shutdown mode (<1 µW), reference voltage flexibility (100 mV to VCC), and channel-to-channel isolation of 120 dB at 50 kHz.
Technical Context
The ADS7844E/2K5G4 implements a capacitive redistribution successive approximation register (SAR) architecture with integrated sample-and-hold, fabricated in 0.6 µm CMOS. Its analog front-end accepts eight single-ended inputs referenced to COM or four differential pairs (CH0–CH7), configurable via serial control bits (A2–A0 and SGL/DIF).
Digital operation relies on a synchronous 3-wire serial interface (CS, DCLK, DIN/DOUT) with BUSY signaling and programmable power-down modes (PD1/PD0). Conversion timing is deterministic: 12 clock cycles for conversion + 3 for acquisition = 15 minimum clocks per sample, scalable to 16- or 24-clock protocols depending on host controller capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with monotonic transfer function and no missing codes. |
| Input Channels | 8 single-ended or 4 differential - enables flexible sensor interfacing without external multiplexers. |
| Throughput Rate | 200 kHz at +5V - supports real-time sampling of fast transients in battery-powered test equipment. |
| INL / DNL | ±1 LSB max - ensures high code-to-code linearity critical for measurement accuracy in industrial process control. |
| SINAD | 72 dB - corresponds to ~11.6 ENOB, suitable for 10-bit effective precision in 10 kHz bandwidth applications. |
| Supply Range | 2.7V to 5V - allows direct integration with Li-ion (3.0–4.2V) or 3.3V/5V system rails without LDO overhead. |
| Power-Down Current | <1 µW - extends battery life in intermittent-sampling PDA or handheld meter applications. |
Pinout & Package
The ADS7844E/2K5G4 is housed in a 20-lead QSOP (DBQ) package with 0.65 mm lead pitch, optimized for space-constrained PCB layouts while maintaining thermal and signal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 | Analog input channels | Eight dedicated inputs configurable as single-ended (vs. COM) or differential pairs; enable multi-sensor monitoring from one IC. |
| COM | Analog ground reference | Sets zero-code voltage in single-ended mode; must be connected to stable system ground or bias point. |
| SHDN | Shutdown control | Active-low signal forcing sub-µW quiescent current; independent of serial interface state. |
| VREF | Reference voltage input | Unbuffered input setting full-scale range (0 V to VREF); supports 100 mV–VCC, enabling low-voltage precision sensing. |
| +VCC, GND | Power supply terminals | Dual +VCC pins (pins 12 & 20) and dual GND pins (13 & 14) reduce supply impedance and improve PSRR. |
| DIN / DOUT | Serial data I/O | CMOS-compatible 3-wire interface; DOUT is high-impedance when CS is high, enabling bus sharing. |
| CS / DCLK / BUSY | Control and status signals | CS enables communication; DCLK synchronizes bit transfers; BUSY indicates active conversion or control byte read. |
Key Features
| Feature | Design Value |
|---|---|
| Onboard 8-channel multiplexer | Eliminates need for external analog switches, reducing BOM count and layout complexity in multi-sensor systems. |
| Configurable input mode | Single-ended or differential selection via SGL/DIF bit allows optimal noise rejection for varying sensor types (e.g., thermocouples vs. RTDs). |
| Programmable power-down | PD1/PD0 bits enable automatic low-power state between conversions - cuts average current without sacrificing first-sample validity. |
| Wide reference voltage range | 100 mV to VCC support enables direct interfacing with low-output sensors (e.g., bridge-based strain gauges) without gain amplification. |
| High channel isolation | 120 dB at 50 kHz prevents crosstalk between adjacent channels during simultaneous multi-channel scanning. |
Applications
| Data Acquisition Systems | Portable Test Equipment |
|---|---|
Use Scenario: Simultaneous monitoring of temperature, pressure, and humidity sensors in a field-deployable environmental logger. IC Role / Device Role / Timing Role: Central ADC managing time-multiplexed analog inputs with deterministic 200 kHz sampling and serial streaming to microcontroller. Use Value: Single-chip 8-channel solution reduces board area by >40% versus discrete mux + ADC designs while maintaining ±1 LSB linearity across all channels. | Use Scenario: Handheld oscilloscope/multimeter combining analog front-end conditioning and digitization in a 3.3V battery-powered enclosure. IC Role / Device Role / Timing Role: Low-power SAR ADC providing 12-bit resolution with auto power-down between trigger events to extend runtime. Use Value: 3 mW typical power at 200 kHz and <1 µW shutdown enable >10-hour operation on two AA cells without thermal derating. |
| Industrial Process Control | Personal Digital Assistants |
Use Scenario: PLC I/O module digitizing 4–20 mA current loop signals from flow meters and valve positioners in factory automation. IC Role / Device Role / Timing Role: Precision ADC with high CMRR and channel isolation ensuring accurate current-to-digital conversion despite shared ground noise. Use Value: 70 dB PSRR and 120 dB channel isolation prevent cross-channel interference in electrically noisy plant-floor environments. | Use Scenario: Early-generation PDA digitizing stylus position, battery voltage, and ambient light level using internal analog sensors. IC Role / Device Role / Timing Role: Integrated multiplexed ADC minimizing component count and PCB real estate in ultra-thin handheld form factors. Use Value: QSOP-20 package (4.4 mm × 6.5 mm) fits within tight mechanical constraints while supporting 8 independent sensor inputs. |
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 variant; same 12-bit SAR core but higher typical INL (±2 LSB) and lower SINAD (70 dB). | Less suited for high-accuracy metrology; acceptable for general-purpose industrial monitoring where ±2 LSB error is tolerable. | Select MAX147ACPP+ only if SSOP-20 footprint is required and performance margin allows ±2 LSB INL. |
| ADS7841U | 4-channel, 12-bit SAR ADC in TSSOP-16; shares identical architecture and serial interface but lacks CH4–CH7 and COM pin. | Applicable only in designs requiring ≤4 analog inputs and smaller PCB footprint; no differential mode support. | Choose ADS7841U for cost-sensitive, low-channel-count applications where board space is more constrained than channel count. |
Compared with MAX147ACPP+, ADS7844E/2K5G4 offers tighter INL (±1 LSB vs. ±2 LSB) and superior dynamic performance (72 dB vs. 70 dB SINAD), making it preferable for precision data logging; versus ADS7841U, it doubles channel count and adds differential input capability at the cost of larger QSOP-20 packaging.
Availability
ADS7844E/2K5G4 is available at Aetrix Electronics and suitable for portable multichannel data loggers, battery-powered test equipment, and industrial process control systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.
Supply support for ADS7844E/2K5G4 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 low-power signal chain solutions.
The ADS7844E/2K5G4 belongs to TI's precision SAR ADC product line, designed specifically for portable, battery-operated instrumentation where resolution, power efficiency, and integration density are critical.
FAQ
What is the maximum sampling rate of the ADS7844E/2K5G4?
The ADS7844E/2K5G4 achieves up to 200 kHz throughput at +5V supply and 3.2 MHz DCLK (16 × fSAMPLE). At +2.7V, the maximum rate drops to 125 kHz due to reduced internal switching speed. This rate assumes continuous conversion with 16-clock protocol and excludes inter-conversion idle time.
Does the ADS7844E/2K5G4 support differential input mode?
Yes, the ADS7844E/2K5G4 supports true differential input mode using four channel pairs (e.g., CH0/CH4, CH1/CH5) 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 up to 120 dB at 50 kHz.
What is the purpose of the COM pin on the ADS7844E/2K5G4?
The COM pin serves as the analog ground reference for single-ended input mode. When configured for single-ended operation (SGL/DIF = HIGH), each selected channel (CH0–CH7) is measured relative to COM, which must be connected to a stable ground or bias point to define the zero-code voltage accurately.
Can the ADS7844E/2K5G4 operate with a 100 mV reference voltage?
Yes, the ADS7844E/2K5G4 supports VREF from 100 mV to +VCC. However, at 100 mV, the LSB size is 24 µV - below the device's intrinsic noise floor - resulting in code dithering. Stable operation requires oversampling and digital filtering, plus ultra-clean layout and low-noise reference sources.
Is the ADS7844E/2K5G4 pin-compatible with the MAX147 series?
The ADS7844E/2K5G4 is functionally compatible and pin-compatible with the MAX147 in 20-lead SSOP (MAX147ACPP+) and QSOP packages. Both share identical pin functions and serial protocol, though ADS7844E/2K5G4 offers tighter INL (±1 LSB vs. ±2 LSB) and higher SINAD (72 dB vs. 70 dB).
ADS7844E/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SSOP (0.154", 3.90mm 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:
- -
ADS7844E/2K5G4 FAQ
1.How can I place an order for ADS7844E/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7844E/2K5G4 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 ADS7844E/2K5G4 reliable?
The price and inventory of ADS7844E/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7844E/2K5G4 is usually 5 days.
3.What payment methods are accepted for ADS7844E/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7844E/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7844E/2K5G4?
ADS7844E/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7844E/2K5G4 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 ADS7844E/2K5G4?
For technical support, including ADS7844E/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7844E/2K5G4 requirements.
6.How does Aetrix verify that ADS7844E/2K5G4 is sourced from the original manufacturer or authorized distributors?
All ADS7844E/2K5G4 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 ADS7844E/2K5G4 meets industry standards.
7.What is the process for return or replacement of ADS7844E/2K5G4?
All ADS7844E/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7844E/2K5G4, 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 ADS7844E/2K5G4 part is unused and in its original packaging.
Return procedure for ADS7844E/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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