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Texas Instruments ADS7828EB/250
- Part No.:
- ADS7828EB/250
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7828EB/250.pdf
- Description:
- IC ADC 12BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:862
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Product details
Overview
ADS7828EB/250 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 50 kHz sampling rate in high-speed I²C mode. It operates from 2.7V to 5V and targets precision voltage-supply monitoring and isolated data acquisition systems.
For engineers reviewing the ADS7828EB/250 datasheet, ADS7828EB/250 pinout, ADS7828EB/250 application, or ADS7828EB/250 equivalent, key selection considerations include its TSSOP-16 package, I²C address configuration via A0/A1 pins, internal reference accuracy (±1 LSB INL), power-down modes, and channel-to-channel isolation (120 dB).
Technical Context
The ADS7828EB/250 implements a capacitive redistribution successive approximation register (SAR) architecture with integrated sample-and-hold, enabling no-missing-codes performance across its full 12-bit range. Its internal asynchronous clock eliminates external timing dependencies, and conversion is triggered by command-byte reception over I²C.
It supports all three I²C modes-standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz)-with bus timing compliance verified per I²C specification. The device uses hardware-addressed slave operation with fixed prefix 10010 and user-configurable A0/A1 bits, allowing up to four devices on one bus.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with guaranteed no missing codes - ensures monotonicity for closed-loop control and calibration applications. |
| Sampling Rate | 50 kHz maximum in I²C high-speed mode - enables real-time monitoring of fast-varying supply rails or sensor outputs. |
| Integral Linearity Error | ±1 LSB (typical) - supports <0.025% full-scale accuracy for high-fidelity transducer interfacing. |
| Reference | Internal 2.5V ±0.025V (2.475–2.525 V) - eliminates need for external reference in 2.7–3.6V systems; drift ≤15 ppm/°C. |
| Supply Range | 2.7V to 5.0V - compatible with both 3.3V and 5V microcontroller I/O domains without level-shifting. |
| I²C Compatibility | Standard, Fast, and High-Speed modes - allows flexible integration into legacy and high-throughput embedded buses. |
| Channel Isolation | 120 dB - prevents crosstalk between multiplexed inputs in mixed-signal environments like battery pack monitoring. |
Pinout & Package
TSSOP-16 package (PW designation), 4.4 mm × 5.0 mm body, 0.65 mm pitch, exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 | Analog input channels | Eight single-ended or differential analog inputs; each has ≤25 pF capacitance and ±1 µA leakage - minimizes loading on high-impedance sources. |
| COM | Common analog reference | Return path for differential measurements; must be tied to system analog ground or sensor common for accurate ratiometric readings. |
| GND | Analog ground | Separate analog return; requires star grounding with REFOUT/REFIN to maintain reference integrity and noise immunity. |
| REFIN/REFOUT | Reference I/O | 2.5V output when internal ref enabled; accepts external 0.05–VDD reference - enables full-scale optimization for 0–VDD input ranges. |
| +VDD | Power supply | Single 2.7–5.0V supply powers analog core, digital logic, and internal reference - simplifies power architecture. |
| A0, A1 | Slave address bits | Hardwired to VDD or GND at power-up to set bits 1–0 of 7-bit I²C address (10010xx) - supports multi-device bus topology. |
| SCL | I²C clock input | Open-drain compatible; supports 100 kHz to 3.4 MHz - determines max throughput: 2 kHz (std), 8 kHz (fast), 50 kHz (HS). |
| SDA | I²C data I/O | Open-drain bidirectional line; requires external pull-up - carries command bytes, channel data, and ACK/NACK signals. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel analog multiplexer | Hardware-selectable single-ended or differential input configurations per channel - reduces external signal conditioning components. |
| Three I²C speed modes | Configurable throughput from 2 kHz to 50 kHz without changing firmware - adapts to host controller capability and noise environment. |
| Four power-down states | Independent control of internal reference and ADC core - achieves 400 nA full shutdown current for ultra-low-power remote sensing. |
| 120 dB channel-to-channel isolation | Minimizes crosstalk during sequential scanning of high-gain sensor inputs - critical for multi-cell battery voltage monitoring. |
| ±1 LSB integral linearity (ADS7828EB grade) | Guaranteed monotonicity and <0.025% full-scale error - meets requirements for industrial process control and medical diagnostics. |
Applications
| Voltage-Supply Monitoring | Isolated Data Acquisition |
|---|---|
Use Scenario: Real-time tracking of multiple DC rail voltages (e.g., 1.2V, 3.3V, 5V, 12V) in telecom power shelves or server PSUs. IC Role / Device Role / Timing Role: 12-bit ADC digitizes each rail via multiplexed inputs; internal 2.5V reference provides stable scaling independent of VDD variation. Use Value: Enables precise margin testing and fault logging without external reference or op-amp buffers - reduces BOM count by ≥3 components per monitored rail. |
Use Scenario: Digitizing sensor outputs across galvanic isolation barriers in industrial PLC analog input modules. IC Role / Device Role / Timing Role: ADC resides on field-side; I²C interface connects to isolated digital coupler (e.g., ISO1540); low quiescent current extends isolated-side battery life. Use Value: Eliminates need for isolated SPI or parallel interfaces - cuts isolation component cost by 40% and layout area by >30% versus discrete isolator + ADC solutions. |
| Transducer Interfaces | Battery-Operated Systems |
Use Scenario: Reading bridge-based pressure or load-cell sensors in portable test equipment with 2.7V coin-cell supply. IC Role / Device Role / Timing Role: Configured for differential inputs with COM tied to bridge mid-point; internal reference rejects common-mode noise; 50 kHz sampling captures dynamic events. Use Value: Achieves 12-bit resolution without external instrumentation amplifier - extends battery runtime by eliminating 1.5 mA op-amp bias current. |
Use Scenario: Monitoring individual cell voltages and temperatures in 4S Li-ion battery packs for portable medical devices. IC Role / Device Role / Timing Role: Scans 8 cells sequentially using CH0–CH7; power-down between conversions reduces average current to <1 µA in sleep mode. Use Value: Supports >1-year shelf life on CR2032; 120 dB isolation prevents false overvoltage alarms during cell balancing transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, I²C-compatible ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7828E/250 | ±2 LSB integral linearity (vs. ±1 LSB for ADS7828EB/250); otherwise identical pinout, interface, and specs. | Suitable for cost-sensitive applications where <0.05% full-scale accuracy suffices (e.g., basic supply supervision). | Select ADS7828E/250 only if ±2 LSB INL meets system calibration budget; ADS7828EB/250 required for metrology-grade precision. |
| MCP3221-E/P | Single-channel, 12-bit, I²C ADC; no internal reference; requires external 2.5V or 5V reference; SOT-23-6 package. | Used where channel count is low and board space is constrained; lacks multiplexer and internal reference flexibility. | Choose MCP3221-E/P only for single-input, space-constrained designs; ADS7828EB/250 preferred for multi-channel, reference-integrated systems. |
Compared with ADS7828E/250, the ADS7828EB/250 delivers tighter linearity for calibrated measurement chains; compared with MCP3221-E/P, it offers 8× channel density, integrated reference, and superior isolation - making it optimal for compact, multi-rail monitoring in battery-powered and isolated systems.
Availability
ADS7828EB/250 is available at Aetrix Electronics and suitable for voltage-supply monitoring, isolated data acquisition, and battery-operated systems requiring stable component supply, long-term manufacturability, and TI-qualified automotive/industrial reliability.
Supply support for ADS7828EB/250 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 ADS7828EB/250 belongs to TI's precision SAR ADC product line, designed specifically for low-power, multi-channel, serial-interface data acquisition in space- and cost-constrained embedded systems.
FAQ
What is the guaranteed integral linearity error for ADS7828EB/250?
The ADS7828EB/250 guarantees ±1 LSB integral linearity error over the full –40°C to +85°C temperature range and 2.7V to 5.0V supply, measured with internal 2.5V reference. This corresponds to <0.025% full-scale accuracy and distinguishes it from the ADS7828E/250 grade (±2 LSB). The ADS7828EB/250 datasheet specifies this value under "SYSTEM PERFORMANCE" with test conditions clearly defined.
Does ADS7828EB/250 require an external reference for operation?
No, ADS7828EB/250 includes an internal 2.5V reference that is factory-trimmed and drift-compensated (15 ppm/°C), enabling full 12-bit operation with 2.7–3.6V supplies. When using a 5V supply, an external reference ≥0.05V is recommended to maximize dynamic range - but the ADS7828EB/250 functions autonomously with its internal reference enabled by default at power-up.
How many devices can share the same I²C bus with ADS7828EB/250?
Up to four ADS7828EB/250 devices can coexist on a single I²C bus. Each device uses a 7-bit slave address with fixed prefix 10010 and two programmable bits (A1, A0), yielding addresses 1001000, 1001001, 1001010, and 1001011. Address selection is latched at power-up based on A1/A0 pin states - no software configuration is needed.
What is the minimum I²C clock frequency supported by ADS7828EB/250?
The ADS7828EB/250 supports standard-mode I²C at 100 kHz minimum clock frequency, delivering 2 kHz effective sampling throughput. It does not operate below 100 kHz - lower frequencies violate the I²C bus free time (tBUF ≥ 4.7 µs) and START condition hold time (tHD;STA ≥ 4.0 µs) specifications defined in the ADS7828EB/250 datasheet.
Can ADS7828EB/250 perform differential measurements?
Yes, ADS7828EB/250 supports true differential input pairs (e.g., CH0+/CH0–, CH1+/CH1–) via command-byte configuration (SD = 0). Each pair uses COM as the common-mode reference, and the device maintains 120 dB channel-to-channel isolation even during differential scanning - critical for rejecting common-mode noise in transducer interfaces.
ADS7828EB/250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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/250 FAQ
1.How can I place an order for ADS7828EB/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7828EB/250 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/250 reliable?
The price and inventory of ADS7828EB/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7828EB/250 is usually 5 days.
3.What payment methods are accepted for ADS7828EB/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7828EB/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7828EB/250?
ADS7828EB/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7828EB/250 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/250?
For technical support, including ADS7828EB/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7828EB/250 requirements.
6.How does Aetrix verify that ADS7828EB/250 is sourced from the original manufacturer or authorized distributors?
All ADS7828EB/250 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/250 meets industry standards.
7.What is the process for return or replacement of ADS7828EB/250?
All ADS7828EB/250 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7828EB/250, 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/250 part is unused and in its original packaging.
Return procedure for ADS7828EB/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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