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Texas Instruments ADS7828E/250
- Part No.:
- ADS7828E/250
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7828E/250.pdf
- Description:
- IC ADC 12BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,200
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Product details
Overview
ADS7828E/250 from Texas Instruments is a 12-bit, 8-channel SAR analog-to-digital converter with I²C interface, internal 2.5V reference, ±2 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 data acquisition systems.
For engineers reviewing the ADS7828E/250 datasheet, ADS7828E/250 pinout, ADS7828E/250 application, or ADS7828E/250 equivalent, key selection criteria include I²C bus timing compatibility (standard/fast/high-speed modes), TSSOP-16 package thermal performance, channel-to-channel isolation (120 dB), and internal reference stability (15 ppm/°C) across –40°C to +85°C.
Technical Context
The ADS7828E/250 implements a capacitive redistribution successive approximation register (SAR) architecture with integrated sample-and-hold, enabling no missing codes over its full 12-bit range. Its internal asynchronous clock eliminates external timing dependencies, while the I²C slave interface supports address configuration via A0/A1 pins (hardware-selectable slave address 10010xx).
It features dual reference operation: internal 2.5V reference (enabled by PD1=1) or external reference input (REFIN/REFOUT pin), with programmable power-down modes that reduce quiescent current to 400 nA in full shutdown. Channel selection is controlled via a 8-bit command byte supporting both single-ended and differential input configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with guaranteed no missing codes - ensures monotonicity and deterministic digital output mapping across full scale. |
| Sampling Rate | 50 kHz maximum in I²C high-speed mode (SCL = 3.4 MHz) - enables real-time monitoring of fast transients in power supply rails. |
| Integral Linearity | ±2 LSB max (ADS7828E grade) - limits end-point accuracy error to ±1.22 mV at 5V reference, critical for calibrated sensor interfaces. |
| Reference | Internal 2.5V ±0.025V (2.475–2.525 V) with 15 ppm/°C drift - provides stable scaling without external components in space-constrained designs. |
| I²C Compatibility | Standard (100 kHz), Fast (400 kHz), and High-Speed (3.4 MHz) modes - allows flexible integration with legacy and high-throughput microcontrollers. |
| Supply Range | 2.7V to 5.0V operation - supports direct connection to 3.3V or 5V logic domains without level-shifting circuitry. |
| Channel Isolation | 120 dB channel-to-channel crosstalk - prevents signal coupling between multiplexed inputs in mixed-signal industrial sensing. |
Pinout & Package
TSSOP-16 (PW) package: 5mm × 4.4mm body, 0.65mm pitch, exposed pad optional; suitable for automated assembly and moderate thermal dissipation (θJA = 240°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 | Analog input channels | Eight single-ended or four differential inputs; each presents 25 pF capacitance and ±1 µA leakage - requires low-impedance source or external buffering for >10 kΩ source impedance. |
| COM | Common analog reference | Return path for differential measurements; must be tied to system analog ground or sensor common to avoid offset errors. |
| REFIN/REFOUT | Reference voltage terminal | Supplies or sinks current for internal 2.5V reference; when external reference used, acts as high-impedance input (>1 GΩ) with 0.05V to VDD range. |
| GND | Analog ground | Separate analog return; must be star-connected to minimize noise coupling into sensitive ADC front-end. |
| +VDD | Power supply | Single 2.7–5.0V rail powers analog core and digital interface; decoupling (0.1 µF ceramic + 1–10 µF bulk) required at pin. |
| A0, A1 | Slave address bits | Hardwired to VDD or GND at power-up to set two LSBs of 7-bit I²C address (10010xx); enables up to four devices on same bus. |
| SCL, SDA | I²C serial interface | Open-drain CMOS pins requiring external pull-ups; support 3.4 MHz clock with ≤100 pF bus capacitance - dictates PCB trace length and stub control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2.5V reference | Eliminates need for external reference IC or resistor divider, reducing BOM count and layout area in compact remote sensors. |
| Three I²C speed modes | Enables optimization of conversion throughput vs. EMI and bus loading: 2 kHz (standard), 8 kHz (fast), or 50 kHz (high-speed) effective sampling. |
| Programmable power-down | Four power states (including 400 nA full shutdown) allow dynamic current scaling - extends battery life in portable data loggers. |
| Differential & single-ended inputs | Configurable per-channel input topology via command byte - supports both ratiometric transducer interfaces and ground-referenced voltage monitoring. |
| 120 dB channel isolation | Minimizes crosstalk-induced measurement error in multi-rail power monitoring where CH0–CH3 monitor +12V, +5V, +3.3V, +1.8V simultaneously. |
Applications
| Voltage-Supply Monitoring | Isolated Data Acquisition |
|---|---|
Use Scenario: Real-time tracking of multiple DC power rails (+12V, +5V, +3.3V) in telecom line cards with tight tolerance requirements. IC Role / Device Role / Timing Role: 8-channel SAR ADC digitizes rail voltages sequentially via I²C; internal 2.5V reference ensures consistent LSB size across temperature. Use Value: ±2 LSB INL and 120 dB channel isolation prevent cross-rail interference, enabling accurate fault detection within ±1% of nominal rail values. | Use Scenario: Analog signal capture across galvanic isolation barrier in industrial PLC analog input modules. IC Role / Device Role / Timing Role: ADC placed on field-side; I²C interface connects to isolated digital coupler (e.g., ISO1540), minimizing component count on high-noise side. Use Value: Micropower operation (60 µA in standard I²C mode) reduces isolated-side power budget; TSSOP-16 footprint fits constrained board areas near isolation barriers. |
| Transducer Interfaces | Battery-Operated Systems |
Use Scenario: Reading bridge-based pressure or load-cell sensors in HVAC control units with ratiometric excitation. IC Role / Device Role / Timing Role: Configured for differential inputs (CH0+/CH0−) with COM tied to sensor common; internal reference matches excitation voltage scaling. Use Value: Differential mode rejects common-mode noise from long sensor cables; 50 kHz sampling captures transient mechanical events without aliasing. | Use Scenario: Multi-parameter environmental logging (temperature, humidity, battery voltage) in wireless sensor nodes powered by coin cells. IC Role / Device Role / Timing Role: ADC enters full power-down (400 nA) between readings; wake-up triggered by microcontroller I²C start condition. Use Value: Ultra-low standby current extends 10-year battery life; single 2.7–5.0V supply simplifies power architecture versus dual-rail alternatives. |
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 |
|---|---|---|---|
| ADS7828EB/250 | Improved ±1 LSB integral linearity (vs. ±2 LSB for ADS7828E/250); otherwise identical pinout, interface, and specs. | Required for applications demanding higher absolute accuracy, e.g., calibrated test equipment or medical sensor front-ends. | Select ADS7828EB/250 when end-point calibration is impractical and raw ADC accuracy must meet tighter INL spec. |
| MCP3208-I/P | 8-channel, 12-bit SPI interface (not I²C); external reference only; DIP-16 package (not TSSOP-16); no internal reference. | Suitable for SPI-based microcontrollers where I²C bus is congested or unavailable; requires external 2.5V or 5V reference. | Choose MCP3208-I/P when migrating from legacy SPI designs or when board layout favors through-hole mounting and external reference flexibility. |
Compared with ADS7828EB/250, the ADS7828E/250 trades 1 LSB INL for lower cost and broader availability; versus MCP3208-I/P, it offers integrated reference and I²C compatibility but requires careful bus timing design for high-speed operation.
Availability
ADS7828E/250 is available at Aetrix Electronics and suitable for voltage-supply monitoring, isolated data acquisition, and battery-operated systems requiring stable component supply and long-term production continuity.
Supply support for ADS7828E/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 precision data converter expertise.
The ADS7828 product line delivers low-power, I²C-compatible multichannel ADCs optimized for remote, isolated, and portable sensing applications where space, power, and interface simplicity are critical.
FAQ
What is the maximum I²C clock frequency supported by the ADS7828E/250?
The ADS7828E/250 supports I²C high-speed mode up to 3.4 MHz with ≤100 pF bus capacitance, enabling 50 kHz sampling. At 400 pF capacitance, maximum SCL frequency drops to 1.7 MHz. Standard (100 kHz) and fast (400 kHz) modes are also fully supported for backward compatibility with legacy controllers.
Does the ADS7828E/250 require an external reference voltage?
No - the ADS7828E/250 includes an internal 2.5V reference (±0.025V, 15 ppm/°C drift) that can be enabled via the PD1 bit in the command byte. An external reference is only required when using a 5V supply and needing full-scale input range up to +5V, or when higher reference accuracy is needed than the internal unit provides.
How many devices can share the same I²C bus with the ADS7828E/250?
Up to four ADS7828E/250 devices can coexist on one I²C bus. The fixed 5-bit prefix "10010" plus user-configurable A0 and A1 pins (each tied to VDD or GND) generate unique 7-bit slave addresses (1001000 to 1001011), avoiding address collisions in multi-ADC systems.
What is the purpose of the COM pin on the ADS7828E/250?
The COM pin serves as the common reference node for differential input measurements. When configured for differential mode (SD=0 in command byte), CHx and CHy pairs measure voltage between their respective pins and COM - which must be connected to the sensor's common or system analog ground to establish correct differential baseline.
Can the ADS7828E/250 operate from a 3.3V supply while maintaining full 12-bit performance?
Yes - the ADS7828E/250 is fully specified from 2.7V to 5.0V. At +3.3V supply, the internal 2.5V reference provides full-scale input range of 0V to +3.3V with no missing codes, ±2 LSB INL, and 50 kHz sampling in high-speed I²C mode, meeting all AC and DC specifications in the datasheet.
ADS7828E/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:
- -
ADS7828E/250 FAQ
1.How can I place an order for ADS7828E/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7828E/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 ADS7828E/250 reliable?
The price and inventory of ADS7828E/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7828E/250 is usually 5 days.
3.What payment methods are accepted for ADS7828E/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7828E/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7828E/250?
ADS7828E/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7828E/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 ADS7828E/250?
For technical support, including ADS7828E/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7828E/250 requirements.
6.How does Aetrix verify that ADS7828E/250 is sourced from the original manufacturer or authorized distributors?
All ADS7828E/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 ADS7828E/250 meets industry standards.
7.What is the process for return or replacement of ADS7828E/250?
All ADS7828E/250 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7828E/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 ADS7828E/250 part is unused and in its original packaging.
Return procedure for ADS7828E/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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