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Texas Instruments ADS7828EB/250G4
- Part No.:
- ADS7828EB/250G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7828EB/250G4.pdf
- Description:
- IC ADC 12BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,633
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Product details
Overview
ADS7828EB/250G4 from Texas Instruments is a 12-bit, 8-channel SAR analog-to-digital converter with I²C interface, internal 2.5V reference, ±1 LSB integral linearity error, and 50kHz sampling rate in high-speed I²C mode. It operates from 2.7V to 5V and targets isolated voltage monitoring and remote data acquisition systems where low power and serial simplicity are critical.
For engineers reviewing the ADS7828EB/250G4 datasheet, ADS7828EB/250G4 pinout, ADS7828EB/250G4 application, or ADS7828EB/250G4 equivalent, key selection criteria include guaranteed no missing codes, TSSOP-16 package compatibility, I²C high-speed mode timing compliance (3.4MHz SCL), internal reference drift (15ppm/°C), and channel-to-channel isolation (120dB).
Technical Context
The ADS7828EB/250G4 implements a capacitive redistribution SAR architecture with integrated sample-and-hold, driven by an asynchronous internal clock. Conversion is initiated via I²C command byte with configurable single-ended/differential input mode and per-channel selection (CH0–CH7).
It supports full I²C protocol compliance across standard (100kHz), fast (400kHz), and high-speed (3.4MHz) modes, with hardware address bits A0/A1 enabling up to four devices on one bus. Power-down states are controlled via PD1/PD0 bits, including independent control of internal reference and ADC core.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes - guarantees monotonicity and deterministic code transitions across full scale. |
| Sampling Rate | 50kHz maximum in I²C high-speed mode - enables real-time monitoring of fast transients in supply rails or sensor outputs. |
| Integral Linearity Error | ±1 LSB (max) - ensures ≤0.024% full-scale error for precision measurement without calibration. |
| Reference | Internal 2.5V ±0.025V (2.475V–2.525V) with 15ppm/°C drift - eliminates external reference component while maintaining accuracy over –40°C to +85°C. |
| I²C Compatibility | Standard, Fast, and High-Speed modes (100kHz/400kHz/3.4MHz) - supports flexible host MCU integration without protocol translation. |
| Supply Range | 2.7V to 5.0V - allows direct operation from 3.3V or 5V system rails without LDO regulation. |
| Channel Count | 8-channel analog multiplexer with COM pin - enables differential or single-ended measurements across eight inputs using shared reference path. |
Pinout & Package
TSSOP-16 (PW) package with 0.65mm pitch, thermally enhanced for low-power industrial environments. Pinout validated per TI SBAS181C datasheet Rev. March 2005.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 | Analog input channels | Eight selectable single-ended or differential analog inputs; each requires ≤25pF source capacitance for full 12-bit settling. |
| GND | Analog ground | Separate AGND return path minimizes digital noise coupling into conversion path. |
| REFIN/REFOUT | Reference input/output | 2.5V internal reference output or external reference input (0.05V–VDD); impedance 110Ω when active, 1GΩ when disabled. |
| COM | Common analog reference | Shared negative input for differential measurements or ground reference for single-ended mode. |
| A0, A1 | Slave address bits | Hardware-configurable I²C address bits (10010xx) - enable up to four ADS7828EB/250G4 devices on same bus. |
| SCL, SDA | I²C serial interface | Open-drain CMOS lines supporting 3.4MHz high-speed mode; require pull-ups per I²C bus load (CB ≤ 400pF). |
| +VDD | Power supply | Single 2.7V–5.0V supply powering analog core, digital logic, and internal reference; quiescent current as low as 400nA in full power-down. |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes | Guaranteed monotonic 12-bit transfer function - eliminates code ambiguities in closed-loop control feedback paths. |
| Channel-to-channel isolation | 120dB typical - prevents crosstalk between adjacent analog inputs during multiplexed acquisition. |
| Programmable power-down | Four discrete states (ADC only, reference only, both off, both on) - enables dynamic power scaling per measurement cycle. |
| Differential & single-ended mode | Configurable per-channel via command byte SD bit - supports ratiometric sensor interfaces and common-mode noise rejection. |
| Internal reference stability | 15ppm/°C drift with 2.5V ±1% tolerance - reduces BOM count and improves long-term accuracy vs. external references. |
Applications
| Voltage-Supply Monitoring | Isolated Data Acquisition |
|---|---|
Use Scenario: Real-time tracking of multiple DC rails (e.g., 1.2V, 3.3V, 5V, 12V) in telecom power shelves with optical isolation barriers. IC Role / Device Role / Timing Role: 8-channel ADC digitizing isolated analog signals via optocoupler-received voltage dividers; I²C interface crosses isolation boundary at 400kHz. Use Value: Eliminates need for separate signal conditioning ICs; internal 2.5V reference ensures consistent LSB size across all channels without external trimming. |
Use Scenario: Remote environmental sensor node powered by Li-ion battery, measuring temperature, humidity, and pressure over 100m twisted-pair cable. IC Role / Device Role / Timing Role: Local SAR ADC acquiring conditioned analog outputs near sensors; I²C master reads data over long trace with bus capacitance up to 400pF. Use Value: 50kHz sampling supports oversampling for noise reduction; 400nA full power-down extends battery life between wake-up intervals. |
| Transducer Interfaces | Battery-Operated Systems |
Use Scenario: Industrial strain-gauge bridge interface with programmable gain amplifier (PGA) feeding differential inputs CH0/CH1. IC Role / Device Role / Timing Role: Precision 12-bit digitizer accepting ratiometric outputs; COM pin tied to bridge mid-point for true differential measurement. Use Value: ±1 LSB INL ensures <0.025% measurement uncertainty; channel-to-channel isolation prevents PGA output coupling into adjacent channels. |
Use Scenario: Portable medical device (e.g., glucose meter) requiring low-power, high-accuracy analog front-end for electrochemical sensor readout. IC Role / Device Role / Timing Role: Primary ADC converting sensor current-to-voltage output; operates from 3.3V coin cell with periodic 2kHz sampling bursts. Use Value: 60µA quiescent current in standard I²C mode and 400nA full shutdown minimize standby drain; internal reference avoids extra voltage reference IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, I²C-interfaced ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-channel, 12-bit, SPI interface only; no I²C support; 100kSPS max; TSSOP-16 | Requires SPI-capable host MCU; lacks I²C address bits A0/A1 for multi-device bus sharing | Select when SPI infrastructure exists and higher throughput (100kSPS) is needed; not drop-in for I²C designs. |
| MCP3208-I/P | 8-channel, 12-bit, SPI interface; no internal reference; external VREF required; DIP-16 | Needs external 2.5V reference and level-shifting for 3.3V/5V mixed systems; larger through-hole footprint | Choose for legacy DIP layouts or when external reference flexibility (e.g., 4.096V) is required; incompatible with I²C bus topology. |
Compared with ADS7828EB/250G4, ADS7822U offers higher speed but removes I²C compatibility and address configurability, while MCP3208-I/P lacks integrated reference and requires board-level redesign for serial interface and packaging - making ADS7828EB/250G4 optimal for space-constrained, multi-node I²C systems needing self-contained accuracy.
Availability
ADS7828EB/250G4 is available at Aetrix Electronics and suitable for voltage-supply monitoring, isolated data acquisition, and battery-operated systems requiring stable component supply, long-lifecycle support, and guaranteed no-missing-codes performance.
Supply support for ADS7828EB/250G4 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 reliability.
The ADS7828EB/250G4 belongs to TI's precision SAR ADC product line, designed specifically for low-power, multi-channel measurement in space-constrained industrial, medical, and remote sensing applications where I²C simplifies system integration.
FAQ
What is the guaranteed integral linearity error for ADS7828EB/250G4?
The ADS7828EB/250G4 guarantees ±1 LSB integral linearity error over its full operating temperature range (–40°C to +85°C) and supply range (2.7V to 5.0V), as specified in the TI SBAS181C datasheet. This corresponds to ≤0.024% of full-scale range with a 2.5V reference, ensuring high-fidelity digitization without post-conversion linearization.
Does ADS7828EB/250G4 support high-speed I²C mode, and what is the maximum SCL frequency?
Yes, ADS7828EB/250G4 fully supports I²C high-speed mode with a maximum SCL clock frequency of 3.4MHz under 100pF bus capacitance, enabling up to 50kHz sampling rate. Timing parameters including tLOW, tHIGH, and tSU;DAT are explicitly characterized for this mode in the official datasheet.
How does the internal 2.5V reference of ADS7828EB/250G4 perform over temperature?
The internal 2.5V reference of ADS7828EB/250G4 exhibits ±0.025V tolerance (2.475V–2.525V) and 15ppm/°C drift over –40°C to +85°C. Typical reference voltage vs. temperature plots confirm stable operation with <0.5mV deviation across the full range, eliminating need for external trimming.
Can ADS7828EB/250G4 operate with a 3.3V supply and still use the internal reference?
Yes, ADS7828EB/250G4 operates with 2.7V–3.6V supply and uses its internal 2.5V reference to provide full-scale input range (0V to +VDD). At 3.3V supply, the internal reference delivers full 12-bit dynamic range for analog inputs from 0V to 3.3V without external components.
What is the power consumption of ADS7828EB/250G4 in full power-down mode?
In full power-down mode (SCL and SDA pulled HIGH), ADS7828EB/250G4 draws only 400nA to 3000nA, depending on temperature and process variation. This ultra-low quiescent current enables multi-year battery life in intermittent-sampling applications such as wireless sensor nodes.
ADS7828EB/250G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 50k
- Number of Inputs:
- 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- I2C
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- 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:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7828EB/250G4 FAQ
1.How can I place an order for ADS7828EB/250G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7828EB/250G4 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 ADS7828EB/250G4 reliable?
The price and inventory of ADS7828EB/250G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7828EB/250G4 is usually 5 days.
3.What payment methods are accepted for ADS7828EB/250G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7828EB/250G4 transactions.
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4.How is shipping managed for ADS7828EB/250G4?
ADS7828EB/250G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7828EB/250G4 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 ADS7828EB/250G4?
For technical support, including ADS7828EB/250G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7828EB/250G4 requirements.
6.How does Aetrix verify that ADS7828EB/250G4 is sourced from the original manufacturer or authorized distributors?
All ADS7828EB/250G4 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 ADS7828EB/250G4 meets industry standards.
7.What is the process for return or replacement of ADS7828EB/250G4?
All ADS7828EB/250G4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7828EB/250G4, 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 ADS7828EB/250G4 part is unused and in its original packaging.
Return procedure for ADS7828EB/250G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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