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Home > Products > Integrated Circuits (ICs) > Data Acquisition > Analog to Digital Converters (ADC)

Analog Devices Inc. AD7870TQ

Name: AD7870TQ
Brand: Analog Devices Inc.
SKU: AD7870TQ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD7870TQ

Manufacturer:: Analog Devices Inc.

Category:: Analog to Digital Converters (ADC)

Package:: 24-CDIP (0.300", 7.62mm)

Datasheet:: AD7870TQ.pdf

Description:: IC ADC 12BIT SAR 24CDIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AD7870TQ from Analog Devices is a complete monolithic 12-bit successive approximation ADC with integrated track-and-hold amplifier, laser-trimmed internal clock, and on-chip 3 V buried Zener reference. It delivers 100 kHz sampling rate, 72 dB SNR at 10 kHz input, ±3 V bipolar input range, and 57 ns data access time. It operates from ±5 V supplies and targets precision data acquisition in industrial instrumentation and DSP systems.

For engineers reviewing the AD7870TQ datasheet, AD7870TQ pinout, AD7870TQ application, or AD7870TQ equivalent, this page provides verified technical context, real-world interface timing constraints, confirmed dynamic and dc accuracy specs, package-specific pin mapping, and two validated alternative parts for design continuity planning.

Technical Context

The AD7870TQ implements a SAR architecture with a fast-settling DAC, high-speed comparator, and internal 3 V temperature-compensated Zener reference. Its track-and-hold acquires signals to 12-bit accuracy in ≤2 μs, enabling full-power conversion up to 50 kHz.

It supports three digital output formats-12-bit parallel, two-byte, and serial-via configurable pins (12/8/CLK, HBEN, SSTRB, SCLK, SDATA). Conversion is initiated asynchronously by CONVST or CS, and BUSY/INT provides status signaling. Internal clock operation (6.5–9 μs conversion) eliminates external timing components.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	12-bit monotonic, no missing codes guaranteed - ensures unambiguous digital representation of analog input across full range.
Sampling Rate	100 kHz maximum - supports Nyquist-limited signal capture up to 50 kHz full-power bandwidth.
SNR	72 dB min at 10 kHz input - enables high-fidelity digitization for audio and sensor signal chains requiring >11.5 ENOB.
Input Range	±3 V bipolar - matches standard industrial transducer outputs and allows direct connection without external scaling.
Data Access Time	57 ns max (T grade) - compatible with fast 8/16-bit microprocessors and DSPs without wait-state insertion.
Reference Output	3.00 V ±10 mV, ±35 ppm/°C tempco - stable on-chip voltage source usable for external circuit biasing or scaling.
Power Dissipation	95 mW max at ±5 V - low quiescent consumption suitable for thermally constrained embedded systems.
Operating Temp	−55°C to +125°C - qualified for extended-temperature military, aerospace, and downhole applications.

Pinout & Package

AD7870TQ is supplied in a 24-pin, 0.3-inch-wide hermetic dual-in-line package (DIP), rated for −55°C to +125°C operation. Pin layout follows standard DIP numbering with Pin 1 identifier notch.

Pin/Terminal	Circuit Role	Design Meaning
1 RD	Active-low read strobe input	Enables three-state data bus output when asserted with CS; controls timing of parallel data availability.
2 BUSY/INT	Open-drain status output	Signals active conversion (BUSY) or completion (INT); requires external pull-up for logic-level compatibility.
3 CLK	External clock input / oscillator enable	Tie to VSS to activate internal laser-trimmed clock; accepts TTL-compatible external 2.5 MHz clock.
4 DB11/HBEN	MSB data output / high-byte enable	Functions as DB11 in 12-bit mode; becomes HBEN control for byte-mode interfacing with DB7–DB0.
24 CS	Active-low chip select	Selects device on shared bus; initiates conversion when CONVST is tied low.
23 CONVST	Asynchronous convert start	Rising edge triggers track-to-hold transition and starts conversion independent of clock phase.
22 12/8/CLK	Mode configuration input	+5 V = 12-bit parallel only; 0 V or −5 V = byte/serial mode with gated or continuous SCLK.
21 VSS	Negative supply rail	−5 V ±5% analog/digital supply; must be decoupled locally to minimize noise coupling into analog section.
20 VIN	Analog input terminal	Accepts ±3 V differential input; 15 kΩ typical input impedance; referenced to AGND.
19 REF OUT	Internal reference output	Provides 3.00 V ±10 mV; load limited to 500 μA; max 50 pF capacitance for stability.
18 AGND	Analog ground reference	Separate ground return for track-and-hold, DAC, and reference; must be star-connected to avoid digital noise injection.
17 VDD	Positive supply rail	+5 V ±5% analog/digital supply; requires local 0.1 μF ceramic + 10 μF tantalum decoupling.
12 DGND	Digital ground reference	Ground return for logic I/O; isolated from AGND except at single-point system ground.

Key Features

Feature	Design Value
Integrated track-and-hold	Acquires ±3 V signals to 12-bit accuracy in ≤2 μs - eliminates need for external THA and simplifies front-end design.
Laser-trimmed internal clock	Guarantees 6.5–9 μs conversion time without external timing components - reduces BOM count and layout complexity.
On-chip 3 V Zener reference	±10 mV initial accuracy and ±35 ppm/°C tempco - enables stable dc-coupled measurements over full military temperature range.
Three interface modes	Parallel (12-bit), byte (two 8-bit), and serial (SCLK/SSTRB/SDATA) - supports legacy 8-bit buses and space-constrained PCB layouts.
Asynchronous conversion trigger	CONVST rising edge initiates conversion independently of clock - allows precise timing alignment with external events or sensors.
Hermetic DIP packaging	24-pin 0.3″ DIP with glass-sealed construction - ensures long-term reliability in high-humidity, corrosive, or vacuum environments.

Applications

Industrial Process Monitoring	Avionics Sensor Acquisition
Use Scenario: Continuous digitization of pressure, temperature, and flow transducer outputs in PLC-based control cabinets. IC Role / Device Role / Timing Role: Primary ADC capturing ±3 V analog sensor signals at 100 kHz with minimal external support circuitry. Use Value: Eliminates external reference and clock components, reducing calibration drift and improving long-term measurement stability over −55°C to +125°C.	Use Scenario: High-reliability data capture from accelerometers and gyroscopes in flight control units. IC Role / Device Role / Timing Role: Hermetically sealed ADC providing deterministic 57 ns data access for real-time closed-loop feedback. Use Value: Guaranteed 12-bit linearity and 72 dB SNR ensure accurate inertial measurement under vibration and thermal cycling.
Test & Measurement Equipment	DSP-Based Signal Analysis
Use Scenario: Digitizing calibrated analog waveforms in benchtop oscilloscopes and spectrum analyzers. IC Role / Device Role / Timing Role: Precision ADC with verified dynamic specs (THD ≤ −80 dB, IMD ≤ −80 dB) for waveform fidelity validation. Use Value: On-chip reference and laser-trimmed clock reduce system-level gain/offset drift during multi-hour calibration sequences.	Use Scenario: Real-time analog input conditioning for fixed-point DSP algorithms in radar and sonar front ends. IC Role / Device Role / Timing Role: Low-latency ADC delivering 12-bit samples directly to TI C5000 or Analog Devices SHARC processors. Use Value: Byte and serial interface options allow flexible memory-mapped or DMA-driven data transfer without FPGA glue logic.

Industrial Process Monitoring

Avionics Sensor Acquisition

Use Scenario: Continuous digitization of pressure, temperature, and flow transducer outputs in PLC-based control cabinets.

IC Role / Device Role / Timing Role: Primary ADC capturing ±3 V analog sensor signals at 100 kHz with minimal external support circuitry.

Use Value: Eliminates external reference and clock components, reducing calibration drift and improving long-term measurement stability over −55°C to +125°C.

Use Scenario: High-reliability data capture from accelerometers and gyroscopes in flight control units.

IC Role / Device Role / Timing Role: Hermetically sealed ADC providing deterministic 57 ns data access for real-time closed-loop feedback.

Use Value: Guaranteed 12-bit linearity and 72 dB SNR ensure accurate inertial measurement under vibration and thermal cycling.

Test & Measurement Equipment

DSP-Based Signal Analysis

Use Scenario: Digitizing calibrated analog waveforms in benchtop oscilloscopes and spectrum analyzers.

IC Role / Device Role / Timing Role: Precision ADC with verified dynamic specs (THD ≤ −80 dB, IMD ≤ −80 dB) for waveform fidelity validation.

Use Value: On-chip reference and laser-trimmed clock reduce system-level gain/offset drift during multi-hour calibration sequences.

Use Scenario: Real-time analog input conditioning for fixed-point DSP algorithms in radar and sonar front ends.

IC Role / Device Role / Timing Role: Low-latency ADC delivering 12-bit samples directly to TI C5000 or Analog Devices SHARC processors.

Use Value: Byte and serial interface options allow flexible memory-mapped or DMA-driven data transfer without FPGA glue logic.

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
AD7870KPZ	Same die, plastic DIP package, 0°C to +70°C rating - lacks hermetic seal and extended temperature qualification.	Suitable for commercial-grade test equipment but not for aerospace or downhole use where moisture ingress or thermal shock is a risk.	Select AD7870TQ when long-term reliability under extreme environmental stress is required; AD7870KPZ suffices for benign lab environments.
ADS7800U	12-bit SAR ADC with 10 μs conversion time, ±5 V input, no internal reference - requires external 5 V reference and clock.	Designed for higher-voltage industrial inputs; lacks integrated reference and track-and-hold, increasing external component count.	Choose ADS7800U only if ±5 V input range is mandatory and board space permits external reference/clock; AD7870TQ offers superior integration for ±3 V systems.

Compared with AD7870KPZ, AD7870TQ provides hermetic sealing and −55°C to +125°C operation essential for mission-critical hardware; compared with ADS7800U, it delivers full functional integration - eliminating reference, clock, and THA - while maintaining identical 12-bit resolution and 100 kHz throughput.

Availability

AD7870TQ is available at Aetrix Electronics and suitable for industrial process monitoring, avionics sensor acquisition, and test & measurement equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7870TQ 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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7870TQ belongs to the LC2MOS 12-bit SAR ADC product line, designed specifically for high-accuracy, low-power, and environmentally robust data acquisition in military, aerospace, and industrial control systems.

FAQ

What is the maximum analog input frequency supported by the AD7870TQ?

The AD7870TQ can accurately convert full-power analog signals up to 50 kHz, consistent with its 100 kHz sampling rate and Nyquist criterion. Its track-and-hold amplifier has a 0.1 dB cutoff typically at 500 kHz, ensuring minimal acquisition error even at high input frequencies. This capability is confirmed in the General Description and Converter Details sections of the AD7870TQ datasheet Rev. C.

Does the AD7870TQ require external components to operate?

No, the AD7870TQ is a complete monolithic ADC requiring only power supply decoupling capacitors - no external reference, clock, or track-and-hold amplifier is needed. Its on-chip 3 V buried Zener reference, laser-trimmed internal clock, and integrated track-and-hold enable standalone operation. External pull-up resistors are required only for open-drain outputs (BUSY/INT, SSTRB, SDATA, SCLK) per Figure 4 and Figure 5 in the AD7870TQ datasheet.

How does the AD7870TQ handle bipolar offset and full-scale errors?

The AD7870TQ specifies bipolar zero error ≤±5 LSB and positive/negative full-scale error ≤±5 LSB (max) over temperature. These errors are measured with respect to the internal reference and include bipolar offset. Adjustment is optional and recommended only for applications demanding full dynamic range utilization; offset must be trimmed before full-scale. The AD7870TQ datasheet Rev. C details adjustment procedures in the Offset And Full-Scale Adjustment-AD7870 section.

What digital interface options does the AD7870TQ support?

The AD7870TQ supports three mutually exclusive digital output formats: 12-bit parallel (via DB11–DB0), two-byte (via HBEN-controlled DB7–DB0 and DB11–DB8), and serial (via SSTRB, SCLK, and SDATA). Interface mode is selected using the 12/8/CLK pin voltage level (+5 V, 0 V, or −5 V), and all timing parameters-including 57 ns data access-are production-tested across the −55°C to +125°C range per Table 3 in the AD7870TQ datasheet.

Is the AD7870TQ pin-compatible with other members of the AD7870/AD7875/AD7876 family?

No, the AD7870TQ is not pin-compatible with AD7875TQ or AD7876TQ. Although all three share the same 24-pin DIP footprint, their analog input structures differ fundamentally: AD7870TQ uses ±3 V bipolar input with 15 kΩ impedance, AD7875TQ uses 0 V to +5 V unipolar input, and AD7876TQ uses ±10 V bipolar input with 33 kΩ impedance and different internal scaling resistors. Swapping devices without redesigning the analog front end will result in incorrect code mapping and saturation.

AD7870TQ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 24-CDIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Active

Number of Bits:: 12

Sampling Rate (Per Second):: 100k

Number of Inputs:: 1

Input Type:: Single Ended

Data Interface:: SPI, Parallel

Configuration:: S/H-ADC

Ratio - S/H:ADC:: 1:1

Number of A/D Converters:: 1

Architecture:: SAR

Reference Type:: Internal

Voltage - Supply, Analog:: ±5V

Voltage - Supply, Digital:: ±5V

Features:: -

Operating Temperature:: -55°C ~ 125°C

Supplier Device Package:: 24-CDIP

Mounting Type:: Through Hole

Grade:: -

Qualification:: -

AD7870TQ FAQ

1.How can I place an order for AD7870TQ through Aetrix?

Please submit a Request for Quotation (RFQ) for AD7870TQ 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 AD7870TQ reliable?

The price and inventory of AD7870TQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7870TQ is usually 5 days.

3.What payment methods are accepted for AD7870TQ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7870TQ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD7870TQ?

AD7870TQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD7870TQ 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 AD7870TQ?

For technical support, including AD7870TQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7870TQ requirements.

6.How does Aetrix verify that AD7870TQ is sourced from the original manufacturer or authorized distributors?

All AD7870TQ 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 AD7870TQ meets industry standards.

7.What is the process for return or replacement of AD7870TQ?

All AD7870TQ units undergo pre-shipment inspection (PSI). If there is an issue with AD7870TQ, 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 AD7870TQ part is unused and in its original packaging.

Return procedure for AD7870TQ:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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