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Texas Instruments ADS7828EB/2K5
- Part No.:
- ADS7828EB/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7828EB/2K5.pdf
- Description:
- IC ADC 12BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,379
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Product details
Overview
ADS7828EB/2K5 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 is used for precision voltage-supply monitoring in isolated, battery-powered, or remote data acquisition systems.
For engineers reviewing the ADS7828EB/2K5 datasheet, ADS7828EB/2K5 pinout, ADS7828EB/2K5 application, or ADS7828EB/2K5 equivalent, key selection criteria include guaranteed no missing codes, channel-to-channel isolation of 120 dB, power-down current as low as 400 nA, and support for I²C standard/fast/high-speed modes up to 3.4 MHz - critical for low-noise, multi-node sensor interfacing.
Technical Context
The ADS7828EB/2K5 implements a capacitive redistribution successive approximation register (SAR) architecture with integrated sample-and-hold, enabling precise 12-bit conversion without external timing components. Its internal asynchronous clock eliminates dependency on master clock stability.
It supports three I²C modes (100 kHz / 400 kHz / 3.4 MHz), with hardware address bits A0/A1 allowing up to four devices on one bus. The device uses a 2-wire serial interface with open-drain SDA/SCL, and features configurable single-ended or differential input modes via command byte control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with guaranteed no missing codes - ensures monotonic transfer function for closed-loop control and measurement integrity. |
| Sampling Rate | 50 kHz maximum in I²C high-speed mode (SCL = 3.4 MHz) - enables real-time monitoring of fast-changing supply rails or transducer outputs. |
| Integral Linearity Error | ±1 LSB (max) - provides ≤0.024% full-scale error, suitable for 0.1% accuracy system-level calibration. |
| Reference | Internal 2.5V ±0.5% reference with 15 ppm/°C drift - eliminates need for external reference in 2.7V–3.6V systems; supports external reference down to 50 mV. |
| Supply Range | 2.7V to 5.0V operation - compatible with both 3.3V and 5V logic domains and mixed-voltage industrial designs. |
| Channel Isolation | 120 dB channel-to-channel crosstalk - prevents signal coupling between multiplexed inputs in high-precision multi-sensor applications. |
| Power-Down Current | 400 nA (full power-down) - extends battery life in portable or energy-harvesting systems requiring periodic wake-up sampling. |
Pinout & Package
TSSOP-16 package (PW suffix), 4.4 mm × 5.0 mm body, 0.65 mm pitch, thermally enhanced for low-power operation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 | Analog input channels | Eight single-ended or four differential input pairs; each supports ±0.2V to VDD+0.2V absolute input range with 25 pF capacitance. |
| COM | Common analog reference | Return path for differential measurements; must be connected to system analog ground or signal common for accurate ratiometric readings. |
| REFIN/REFOUT | Reference input/output | Provides 2.5V internal reference or accepts external reference (0.05V–VDD); output impedance 110 Ω when enabled, 1 GΩ when disabled. |
| GND | Analog ground | Dedicated analog return; must be separated from digital ground and tied at single point to minimize noise coupling into ADC core. |
| +VDD | Power supply | Single 2.7V–5.0V supply powering analog and digital sections; requires local 1 µF + 0.1 µF decoupling per datasheet layout guidelines. |
| A0, A1 | I²C slave address bits | Hardwired address select pins; set device address to 10010xx₂, enabling up to four ADS7828EB/2K5 units on same I²C bus. |
| SCL, SDA | I²C serial interface | Open-drain bidirectional lines supporting standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes with programmable timing compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed no missing codes | Ensures monotonicity across full 12-bit range - essential for position sensing, closed-loop feedback, and safety-critical threshold detection. |
| Configurable input mode | Command-byte-selectable single-ended or differential inputs - allows flexible front-end design without external op-amp reconfiguration. |
| Three I²C speed modes | Supports 100 kHz / 400 kHz / 3.4 MHz clock rates - enables optimization for EMI reduction (low speed) or high-throughput data streaming (high speed). |
| Low-power power-down states | Four selectable power-down modes including full shutdown (400 nA) - reduces system idle power while preserving configuration state. |
| On-chip 2.5V reference | 15 ppm/°C drift and 2.475V–2.525V tolerance - eliminates external reference component count and improves temperature stability in unregulated environments. |
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 or server PSUs. IC Role / Device Role / Timing Role: 8-channel multiplexed ADC samples rail voltages sequentially; internal reference enables ratiometric accuracy independent of VDD variation. Use Value: ±1 LSB INL and 120 dB channel isolation prevent cross-talk between adjacent rail measurements, ensuring reliable fault detection and margining. |
Use Scenario: Sensor data collection across galvanically isolated barriers using optocouplers or digital isolators. IC Role / Device Role / Timing Role: ADC resides on isolated side; I²C interface communicates digitized values through isolated bus, minimizing component count vs SPI-isolated solutions. Use Value: Low 400 nA power-down current extends battery life in isolated remote nodes; 50 kHz throughput supports burst-mode sampling during brief wake windows. |
| Transducer Interfaces | Battery-Operated Systems |
|
Use Scenario: Reading resistive bridge sensors (e.g., strain gauges, RTDs) with programmable gain amplifiers in industrial instrumentation. IC Role / Device Role / Timing Role: Differential input mode rejects common-mode noise from long sensor leads; internal reference provides stable excitation reference for ratiometric scaling. Use Value: ±1 LSB INL and 33 µVRMS noise enable sub-0.1% measurement accuracy over temperature without external calibration. |
Use Scenario: Voltage, temperature, and current monitoring in handheld medical devices or wireless sensor nodes. IC Role / Device Role / Timing Role: ADC powers up only during scheduled measurement intervals; internal reference eliminates need for external precision reference IC. Use Value: 225–320 µA active current (at 3.4 MHz I²C) and 400 nA shutdown current maximize usable battery capacity in intermittent-sampling applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, I²C-interfaced, multiplexed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-channel, 12-bit, SPI interface only; no I²C support; 50 kHz max sampling; ±1 LSB INL; TSSOP-16. | Requires SPI-capable MCU; lacks I²C bus sharing capability; no hardware address bits for multi-device configurations. | Select when SPI is preferred and I²C bus loading or multi-drop topology is not required. |
| MCP3208-I/P | 8-channel, 12-bit, SPI-only; 100 kSPS max; ±1 LSB INL; DIP-16 package; no internal reference. | Needs external reference and level-shifting for 3.3V/5V mixed systems; larger footprint; higher active current (~500 µA). | Choose for through-hole prototyping or legacy SPI-based designs where board space and reference sourcing are less constrained. |
Compared with ADS7828EB/2K5, the ADS7822U offers identical resolution and linearity but lacks I²C flexibility and multi-device addressing, while the MCP3208-I/P trades interface compatibility and integration for broader availability and DIP packaging - making ADS7828EB/2K5 optimal for space-constrained, multi-node, battery-aware I²C systems.
Availability
ADS7828EB/2K5 is available at Aetrix Electronics and suitable for voltage-supply monitoring, isolated data acquisition, and battery-operated systems requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and medical OEM programs.
Supply support for ADS7828EB/2K5 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 signal chain solutions.
The ADS7828EB/2K5 belongs to TI's precision SAR ADC product line, designed specifically for low-power, multi-channel, I²C-connected sensing in space- and power-constrained applications such as portable instrumentation and distributed monitoring systems.
FAQ
What is the maximum sampling rate of the ADS7828EB/2K5?
The ADS7828EB/2K5 achieves a maximum sampling rate of 50 kHz when operating in I²C high-speed mode with SCL = 3.4 MHz. At lower I²C speeds (400 kHz fast mode or 100 kHz standard mode), the throughput drops to 8 kHz and 2 kHz respectively due to serial interface bandwidth limitations - not ADC core speed.
Does the ADS7828EB/2K5 require an external reference?
No, the ADS7828EB/2K5 includes an internal 2.5V reference with ±0.5% initial accuracy and 15 ppm/°C drift, sufficient for most 2.7V–3.6V applications. An external reference is only required when using a 5V supply and needing full 0–5V input range, or when higher initial accuracy or lower drift is mandated.
How many ADS7828EB/2K5 devices can share the same I²C bus?
Up to four ADS7828EB/2K5 devices can operate on a single I²C bus using the A0 and A1 address pins, which configure the two least-significant bits of the fixed 10010xx₂ slave address. Each combination (00, 01, 10, 11) yields a unique 7-bit address, enabling multi-drop topology without external address translators.
What is the power consumption of the ADS7828EB/2K5 in active mode?
At +2.7V supply and 3.4 MHz I²C clock, the ADS7828EB/2K5 draws 225–320 µA quiescent current. Power dissipation scales with I²C speed: 180 µW at 100 kHz, 300 µW at 400 kHz, and 675–1000 µW at 3.4 MHz - all values include internal reference current when enabled.
Can the ADS7828EB/2K5 perform differential measurements?
Yes, the ADS7828EB/2K5 supports both single-ended and differential input configurations via its command byte. Setting the SD bit to '0' selects differential mode, allowing eight possible differential pairs (e.g., CH0–CH1, CH2–CH3) with 120 dB channel-to-channel isolation and matched gain/offset performance.
ADS7828EB/2K5 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:
- Pseudo-Differential
- 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 ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7828EB/2K5 FAQ
1.How can I place an order for ADS7828EB/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7828EB/2K5 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/2K5 reliable?
The price and inventory of ADS7828EB/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7828EB/2K5 is usually 5 days.
3.What payment methods are accepted for ADS7828EB/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7828EB/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7828EB/2K5?
ADS7828EB/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7828EB/2K5 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/2K5?
For technical support, including ADS7828EB/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7828EB/2K5 requirements.
6.How does Aetrix verify that ADS7828EB/2K5 is sourced from the original manufacturer or authorized distributors?
All ADS7828EB/2K5 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/2K5 meets industry standards.
7.What is the process for return or replacement of ADS7828EB/2K5?
All ADS7828EB/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7828EB/2K5, 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/2K5 part is unused and in its original packaging.
Return procedure for ADS7828EB/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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