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Texas Instruments ADS7816PB
- Part No.:
- ADS7816PB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADS7816PB.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,911
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Product details
Overview
ADS7816PB from Burr-Brown (now Texas Instruments) is a 12-bit, 200kHz 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 - optimized for battery-powered remote data acquisition systems requiring micro-power precision.
For engineers reviewing the ADS7816PB datasheet, ADS7816PB pinout, ADS7816PB application, or ADS7816PB equivalent, this page provides verified technical context, package-specific pin functions, real-world use-value in isolated sensing, and validated alternative options for low-power 12-bit ADC selection.
Technical Context
The ADS7816PB implements a capacitive redistribution successive approximation register (SAR) architecture on 0.6µm CMOS, integrating sample-and-hold functionality. It requires an external clock (10kHz–3.2MHz), single +5V supply, and external reference - with conversion timing fully synchronized to DCLOCK falling edges.
Its differential input (+In/–In) captures voltage difference during hold mode without resampling –– the –In pin is restricted to ±200mV range and serves primarily as remote ground sense. Serial output is straight binary, MSB-first, with null bit preceding 12-bit result on DOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete codes; LSB = VREF/4096 (e.g., 1.22mV at 5V ref). |
| Sampling Rate | 200kHz maximum - supports real-time monitoring of fast transients in sensor interfaces. |
| Power Consumption | 1.9mW at 200kHz; drops to 150µW at 12.5kHz - enables multi-channel battery operation. |
| Shutdown Current | 3µA max - achieved by pulling CS/SHDN high; critical for duty-cycled remote nodes. |
| Integral Linearity | ±2 LSB (max) - ensures monotonicity and <1 LSB code-width variation across full scale. |
| Reference Range | 0.1V to 5V - allows scaling input sensitivity (e.g., 100mV ref for thermocouple mV-level signals). |
| Input Type | Differential - rejects common-mode noise up to ±200mV on –In; +In valid from –0.2V to VCC+0.2V. |
Pinout & Package
ADS7816PB is packaged in an 8-pin plastic mini-DIP (PDIP), per drawing 006. Pin spacing is 0.300", body width 0.355", and lead count matches SOIC/MSOP variants but with through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VREF | Reference voltage input | Accepts 0.1V–5V external reference; sets full-scale span and LSB weight; draws 2.4–100µA depending on sample rate and code. |
| 2 +In | Non-inverting analog input | Differential input node; voltage range –0.2V to VCC+0.2V; 25pF capacitance; must settle within 1.5 clock cycles. |
| 3 –In | Inverting analog input | Remote ground sense point; limited to ±200mV deviation from local GND; not resampled mid-conversion. |
| 4 GND | Analog ground reference | Must connect to clean analog ground plane; separate from digital ground to avoid noise coupling into SAR decision windows. |
| 5 CS/SHDN | Chip select / shutdown control | Active-low conversion trigger; HIGH forces full shutdown (3µA), disabling both analog and digital sections. |
| 6 DOUT | Serial data output | MSB-first 12-bit straight binary; data valid on falling edge of DCLOCK; tri-states after LSB when CS rises. |
| 7 DCLOCK | Data clock input | Synchronizes sampling, conversion, and serial output; min pulse width 150ns; frequency sets throughput (fCLK = 16×fSAMPLE). |
| 8 +VCC | Positive supply | +4.5V to +5.25V; powers internal logic and analog circuitry; requires 0.1µF ceramic bypass placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Micro-power operation | 1.9mW at 200kHz sampling enables >1-year battery life in 10s-of-µA average-current remote nodes. |
| Programmable reference | 0.1V–5V range allows direct interfacing with low-output sensors (e.g., thermocouples) without gain amplification. |
| Differential input architecture | Fixed –In offset window (±200mV) enables rejection of ground potential shifts in long-cable or isolated acquisitions. |
| Short-cycle conversion | CS can be raised mid-transfer to terminate early - reduces power when only coarse resolution (e.g., 4–8 bits) suffices. |
| CMOS-compatible interface | VIH ≥3V, VOL ≤0.4V at 250µA - interoperates directly with 5V microcontrollers without level-shifting. |
Applications
| Thermocouple Monitoring | Isolated Industrial Sensor Node |
|---|---|
Use Scenario: Measuring temperature from K-type thermocouples (output ~41µV/°C) in factory-floor environments with EMI and ground loops. IC Role / Device Role / Timing Role: ADC front-end with 100mV reference scaling; differential input rejects common-mode noise from motor drives and switching supplies. Use Value: Eliminates need for instrumentation amplifier stage; ±2 LSB INL preserves calibration accuracy over –40°C to +85°C industrial range. |
Use Scenario: Remote analog signal digitization across opto-isolators or transformer-coupled barriers in PLC I/O modules. IC Role / Device Role / Timing Role: Low-power SAR ADC operating behind isolation barrier; shutdown mode minimizes isolated-side power draw. Use Value: 3µA shutdown current extends lifetime of isolated DC-DC converters; serial interface reduces isolation channel count vs parallel bus. |
| Battery-Powered Data Logger | Multi-Channel Sensor Hub |
Use Scenario: Portable environmental monitor logging temperature, humidity, and gas sensor outputs on AA batteries for 6+ months. IC Role / Device Role / Timing Role: Primary ADC with adaptive sampling - runs at 12.5kHz (150µW) during idle, bursts to 200kHz for event-triggered capture. Use Value: 150µW quiescent power at low rate enables ultra-low average current; no external oscillator needed. |
Use Scenario: Simultaneous acquisition from 8+ analog sensors (e.g., strain gauges, pressure transducers) in compact test equipment. IC Role / Device Role / Timing Role: One ADC per channel with shared DCLOCK and CS lines; differential inputs reject crosstalk in dense PCB layouts. Use Value: 8-pin mini-DIP footprint allows tight channel spacing; 200kHz rate supports >1kS/s aggregate throughput across channels. |
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 |
|---|---|---|---|
| ADS7816U | Same architecture and specs, but in SOIC-8 package (vs PDIP); ±2 LSB INL (same grade as PB) | Surface-mount assembly required; better thermal performance and board density | Select ADS7816U for automated SMT production; ADS7816PB remains optimal for prototyping, through-hole legacy systems, or high-vibration environments. |
| ADS7822U | 12-bit, 200kHz SAR ADC with internal reference (2.5V); consumes 2.5mW at full rate; no VREF pin | Eliminates external reference design complexity but fixes full-scale range; lacks differential input | Choose ADS7822U when system-level reference stability is hard to guarantee; ADS7816PB preferred when flexible scaling or noise-rejecting differential input is mandatory. |
Compared with ADS7816U and ADS7822U, the ADS7816PB uniquely combines through-hole reliability, user-programmable reference, and true differential input - making it irreplaceable in ruggedized or precision-scaled remote sensing where layout control and signal integrity are constrained.
Availability
ADS7816PB is available at Aetrix Electronics and suitable for battery-powered data loggers, isolated industrial sensor nodes, thermocouple monitoring systems, and multi-channel sensor hubs requiring stable component supply across extended product lifecycles.
Supply support for ADS7816PB 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
Burr-Brown Corporation, acquired by Texas Instruments in 2000, specialized in high-precision analog ICs including data converters, op amps, and interface solutions for industrial and instrumentation markets.
The ADS7816PB belongs to Burr-Brown's micro-power SAR ADC family, designed specifically for remote, isolated, and battery-operated data acquisition where low standby current and flexible reference scaling outweigh raw speed or integration.
FAQ
What is the maximum sampling rate of the ADS7816PB?
The ADS7816PB achieves a maximum sampling rate of 200kHz when driven by a 3.2MHz DCLOCK signal (fCLK = 16 × fSAMPLE). At this rate, it consumes 1.9mW and maintains ±2 LSB integral linearity. Lower rates (e.g., 12.5kHz) reduce power to 150µW while preserving specification compliance across the –40°C to +85°C temperature range.
Does the ADS7816PB have an internal reference voltage?
No, the ADS7816PB requires an external reference voltage applied to the VREF pin. It accepts 0.1V to 5V, enabling full-scale span adjustment - for example, 100mV for thermocouple signals or 5V for general-purpose sensing. This external reference also determines LSB size (VREF/4096) and directly impacts noise, offset, and gain error scaling.
What package type is used for the ADS7816PB?
The ADS7816PB is supplied in an 8-pin plastic mini-DIP (PDIP) package, per drawing number 006. It features 0.300" lead spacing and through-hole mounting - distinct from the SOIC-8 (ADS7816U) and MSOP-8 (ADS7816E) variants of the same device family.
How does the differential input of the ADS7816PB function in practice?
The ADS7816PB's differential input uses +In and –In pins to capture voltage difference during hold mode, with –In restricted to ±200mV relative to local ground. This configuration is intended for remote ground sensing - e.g., connecting –In to the shield or ground at a distant sensor to reject ground-loop offsets - not for wide common-mode rejection.
Can the ADS7816PB be powered down between conversions to save energy?
Yes - asserting CS/SHDN HIGH places the ADS7816PB into full shutdown mode, reducing supply current to ≤3µA. This feature is essential for battery-powered applications. The device exits shutdown automatically on the next CS LOW transition, with no wake-up delay, and begins sampling within 1.5 clock cycles.
ADS7816PB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
ADS7816PB FAQ
1.How can I place an order for ADS7816PB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7816PB 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 ADS7816PB reliable?
The price and inventory of ADS7816PB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7816PB is usually 5 days.
3.What payment methods are accepted for ADS7816PB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7816PB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7816PB?
ADS7816PB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7816PB 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 ADS7816PB?
For technical support, including ADS7816PB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7816PB requirements.
6.How does Aetrix verify that ADS7816PB is sourced from the original manufacturer or authorized distributors?
All ADS7816PB 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 ADS7816PB meets industry standards.
7.What is the process for return or replacement of ADS7816PB?
All ADS7816PB units undergo pre-shipment inspection (PSI). If there is an issue with ADS7816PB, 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 ADS7816PB part is unused and in its original packaging.
Return procedure for ADS7816PB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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