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Texas Instruments ADS7816UBG4
- Part No.:
- ADS7816UBG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADS7816UBG4.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,301
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Product details
Overview
ADS7816UBG4 from Texas Instruments (formerly Burr-Brown) is a 12-bit, 200kHz sampling SAR analog-to-digital converter with differential input, synchronous serial interface, and programmable reference voltage (100mV–5V). It delivers 1.9mW power at full rate, 3µA shutdown current, and ±2 LSB integral linearity error in SOIC-8 package - ideal for low-power remote data acquisition systems requiring high-resolution signal digitization.
For engineers reviewing the ADS7816UBG4 datasheet, ADS7816UBG4 pinout, ADS7816UBG4 application, or ADS7816UBG4 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply support for industrial embedded and battery-powered measurement designs.
Technical Context
The ADS7816UBG4 implements a capacitive redistribution successive approximation register (SAR) architecture fabricated in 0.6µm CMOS, enabling single-supply +5V operation with inherent sample-and-hold functionality. Its conversion cycle requires exactly 12 clock cycles, with 1.5-cycle acquisition time and no pipeline delay - output data appears on DOUT immediately after initiation.
It uses a 3-wire synchronous serial interface (CS/SHDN, DCLOCK, DOUT), where CS falling edge initiates conversion and data transfer, and DOUT outputs 12-bit straight-binary data MSB-first on DCLOCK falling edges. The differential input (+In/–In) captures voltage difference directly onto internal capacitor array without resampling –In, limiting –In range to ±200mV for remote ground sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes; LSB = VREF/4096 (e.g., 1.22mV at 5V reference). |
| Sampling Rate | 200kHz maximum - supports real-time monitoring of signals up to ~99kHz (Nyquist-limited). |
| Power Consumption | 1.9mW at 200kHz - enables continuous operation in coin-cell–powered sensors without thermal derating. |
| Shutdown Current | 3µA max - allows >1000× reduction vs active mode, critical for duty-cycled remote nodes. |
| Reference Range | 100mV to 5V - enables flexible input scaling (e.g., 100mV for thermocouple front-end, 5V for industrial voltage monitoring). |
| INL / DNL | ±2 LSB / ±2 LSB (UB grade) - ensures monotonicity and <0.05% full-scale linearity error at 5V reference. |
| Input Type | Differential (with ±200mV –In range) - rejects common-mode noise only within tight offset window; best used for remote ground referencing. |
| Interface | Synchronous 3-wire serial (CS/SHDN, DCLOCK, DOUT) - eliminates need for parallel bus or external framing logic. |
Pinout & Package
ADS7816UBG4 is housed in an 8-lead SOIC package (Package Drawing 182), measuring 3.9mm × 4.9mm × 1.75mm, with standard 1.27mm lead pitch and gull-wing leads compatible with reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VREF | External reference voltage input | Defines full-scale analog input span; supplies bias current (up to 100µA at 200kHz); must be bypassed with 0.1µF ceramic capacitor. |
| 2 +In | Non-inverting analog input | Accepts voltage from 0V to VCC+0.2V; sampled differentially against –In; source impedance must settle 25pF capacitance within 1.5 clock cycles. |
| 3 –In | Inverting analog input | Limited to ±200mV range; used for remote ground sensing - not for large common-mode rejection; connects directly to local or remote GND. |
| 4 GND | Analog ground reference | Must connect to clean analog ground plane; isolated from digital ground to prevent noise coupling into conversion result. |
| 5 CS/SHDN | Chip select / shutdown control | Active-low conversion trigger; HIGH forces full shutdown (3µA), LOW enables conversion and serial output; controls power-down timing. |
| 6 DOUT | Serial data output | Outputs 12-bit straight-binary MSB-first on DCLOCK falling edge; tri-states when CS goes HIGH; requires 3kΩ pull-up for reliable logic levels. |
| 7 DCLOCK | Data clock input | Synchronizes serial transfer and sets conversion speed; accepts 10kHz–3.2MHz; min. 150ns high/low time; duty cycle non-critical. |
| 8 +VCC | Positive supply | +4.5V to +5.25V; powers analog and digital sections; requires local 0.1µF ceramic bypass placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Micro-power operation | 1.9mW at 200kHz enables >1-year battery life in 10-second wakeup interval sensor nodes. |
| Automatic power-down | Enters 3µA shutdown after conversion completion or when CS is HIGH - no software overhead required. |
| Differential input architecture | Captures voltage difference between +In and –In without resampling –In, enabling precise remote ground referencing. |
| Programmable reference range | 100mV–5V adjustment allows matching ADC resolution to sensor output range - e.g., 100mV for µV-level thermocouples. |
| SOIC-8 packaging | Industry-standard 8-pin SOIC footprint simplifies PCB layout, supports automated assembly, and enables drop-in replacement in legacy designs. |
| No pipeline delay | Output data corresponds to currently sampled input - critical for closed-loop control and real-time threshold detection. |
Applications
| Thermocouple Monitoring | Portable Multimeter Front-End |
|---|---|
|
Use Scenario: Digitizing µV-level thermocouple outputs across –200°C to +1372°C (Type K) using programmable gain amplifier and 100mV reference. IC Role / Device Role / Timing Role: Primary ADC capturing differential thermocouple voltage with remote ground sense via –In pin; synchronized by microcontroller's GPIO-driven DCLOCK. Use Value: 12-bit resolution at 100mV reference yields 24µV LSB - sufficient to resolve 0.1°C increments without oversampling. |
Use Scenario: High-accuracy AC/DC voltage and current measurement in handheld multimeters with auto-ranging and battery operation. IC Role / Device Role / Timing Role: Core sampling ADC interfacing to multiplexer and precision reference; CS/SHDN controlled by system MCU to minimize average power. Use Value: 1.9mW active power and 3µA shutdown enable >500-hour battery life while maintaining 0.1% measurement accuracy. |
| Isolated Industrial Sensor Node | Remote Environmental Data Logger |
|
Use Scenario: Battery-powered vibration/temperature node mounted on rotating machinery, transmitting data via opto-isolated UART. IC Role / Device Role / Timing Role: Low-noise ADC acquiring conditioned analog signals before isolation barrier; powered from isolated DC-DC converter. Use Value: Differential input rejects common-mode noise induced by motor EMI; SOIC package withstands industrial thermal cycling. |
Use Scenario: Solar-powered soil moisture and air quality logger deployed in field locations with intermittent connectivity. IC Role / Device Role / Timing Role: Signal digitizer for resistive humidity and electrochemical gas sensors; triggered periodically by RTC interrupt. Use Value: 12.5kHz sampling mode draws only 30µA quiescent current - extends solar-charged battery life to >2 years. |
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 |
|---|---|---|---|
| ADS7816UB | Same die, identical SOIC-8 package, same ±2 LSB INL/DNL spec, but rated for commercial temperature range (0°C to +70°C) instead of –40°C to +85°C. | Not suitable for extended-temperature industrial or automotive environments; lower cost for consumer-grade portable instruments. | Select ADS7816UBG4 for designs requiring guaranteed operation at –40°C or +85°C; choose ADS7816UB only if ambient stays within 0°C–70°C. |
| ADS7822U | 12-bit, 200kHz SAR ADC in SOIC-8, but features internal reference (2.5V), no external VREF pin, and higher typical power (2.5mW at 200kHz). | Eliminates external reference circuitry but sacrifices input range flexibility; less suitable for multi-sensor systems requiring varying VREF per channel. | Choose ADS7816UBG4 when reference voltage must scale with sensor output (e.g., thermocouple vs RTD); use ADS7822U only when fixed 2.5V range suffices. |
Compared with ADS7816UB, ADS7816UBG4 guarantees performance over –40°C to +85°C - essential for outdoor or industrial deployments; compared with ADS7822U, it retains full external reference control for optimal SNR across diverse sensor types, at lower active power.
Availability
ADS7816UBG4 is available at Aetrix Electronics and suitable for battery-operated instrumentation, remote environmental monitoring, and isolated industrial sensor systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADS7816UBG4 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 acquired Burr-Brown in 2000 and maintains full product support, datasheets, and application notes for legacy precision analog ICs including the ADS7816 series.
The ADS7816UBG4 belongs to TI's precision SAR ADC portfolio designed specifically for low-power, high-resolution data acquisition in space-constrained, battery-sensitive applications - emphasizing micro-power operation, flexible reference scaling, and robust serial interfacing.
FAQ
What is the operating temperature range of the ADS7816UBG4?
The ADS7816UBG4 is specified for operation from –40°C to +85°C, making it suitable for industrial, automotive under-hood, and outdoor environmental monitoring applications. This extended temperature range is confirmed in the official TI datasheet PDS-1355B and distinguishes it from the commercial-grade ADS7816UB (0°C to +70°C). All electrical specifications - including INL, DNL, and power consumption - are guaranteed across this full range.
Does the ADS7816UBG4 require an external reference voltage?
Yes, the ADS7816UBG4 requires an external reference voltage applied to the VREF pin, which can be set from 100mV to 5V. This reference directly defines the full-scale input range and LSB size (VREF/4096). Unlike some newer ADCs, it has no internal reference - so a stable, low-noise external source (e.g., REF5025 or buffered DAC output) is mandatory for accurate measurements. The reference current varies with sample rate and code value, peaking near 100µA at 200kHz.
How does the differential input of the ADS7816UBG4 work in practice?
The ADS7816UBG4 accepts differential input between +In and –In pins, but –In is limited to ±200mV relative to GND - it is not a true wide-range differential input. In practice, –In is intended for remote ground sensing: connect it to the signal source's local ground point (e.g., thermocouple junction) via a trace adjacent to +In. This configuration rejects small ground potential differences but does not support large common-mode voltages. Exceeding ±200mV on –In risks linearity degradation.
Can the ADS7816UBG4 be used with a 3.3V microcontroller?
Yes, the ADS7816UBG4 operates from a +5V supply (VCC = 4.5V–5.25V), but its digital interface is CMOS-compatible and tolerant of 3.3V logic levels on CS/SHDN and DCLOCK inputs, provided VIH ≥ 3.0V and VIL ≤ 0.8V. DOUT output swings from 0.4V to 3.5V (IOL/I OH = ±250µA), so a 3.3V MCU can reliably read it - though a level-shifter or pull-up to 3.3V may improve noise margin in noisy environments.
What is the minimum clock frequency supported by the ADS7816UBG4?
The ADS7816UBG4 supports a minimum DCLOCK frequency of 10kHz, corresponding to a 625Hz throughput rate. This is determined by internal capacitor leakage limits - below 10kHz, settling errors increase due to charge loss during sampling. At 10kHz clock, the device consumes ~30µA quiescent current, making it viable for ultra-low-power wake-on-event sensor nodes where 12-bit resolution is needed but speed is secondary.
ADS7816UBG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7816UBG4 FAQ
1.How can I place an order for ADS7816UBG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7816UBG4 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 ADS7816UBG4 reliable?
The price and inventory of ADS7816UBG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7816UBG4 is usually 5 days.
3.What payment methods are accepted for ADS7816UBG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7816UBG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7816UBG4?
ADS7816UBG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7816UBG4 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 ADS7816UBG4?
For technical support, including ADS7816UBG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7816UBG4 requirements.
6.How does Aetrix verify that ADS7816UBG4 is sourced from the original manufacturer or authorized distributors?
All ADS7816UBG4 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 ADS7816UBG4 meets industry standards.
7.What is the process for return or replacement of ADS7816UBG4?
All ADS7816UBG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7816UBG4, 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 ADS7816UBG4 part is unused and in its original packaging.
Return procedure for ADS7816UBG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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