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

Analog Devices Inc. AD7875LPZ

Name: AD7875LPZ
Brand: Analog Devices Inc.
SKU: AD7875LPZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD7875LPZ

Manufacturer:: Analog Devices Inc.

Category:: Analog to Digital Converters (ADC)

Package:: 28-LCC (J-Lead)

Datasheet:: AD7875LPZ.pdf

Description:: IC ADC 12BIT SAR 28PLCC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AD7875LPZ from Analog Devices is a complete monolithic 12-bit sampling analog-to-digital converter (ADC) with integrated track-and-hold amplifier, laser-trimmed internal clock, on-chip 3 V buried Zener reference, and parallel/byte/serial digital interface. It supports unipolar 0 V to +5 V analog input range, achieves 72 dB SNR at 10 kHz, and delivers 57 ns data access time. It is used in precision data acquisition systems requiring high dynamic performance and microprocessor compatibility.

For engineers reviewing the AD7875LPZ datasheet, AD7875LPZ pinout, AD7875LPZ application, or AD7875LPZ equivalent, key selection considerations include its unipolar input range, guaranteed dynamic specs (SNR, THD), 24-pin DIP package, 8 μs conversion time, and support for byte- and serial-mode interfacing with microcontrollers and DSPs.

Technical Context

The AD7875LPZ implements a successive approximation register (SAR) architecture with a fast-settling DAC and high-speed comparator. Its track-and-hold acquires signals to 12-bit accuracy in ≤2 μs, enabling full-power conversion up to 50 kHz while maintaining dc accuracy (±1 LSB INL max, ±5 LSB unipolar offset error).

It features a self-contained internal clock laser-trimmed to 2.5 MHz (6.5–9 μs conversion), but accepts external clocks via CLK pin. The 3 V reference is temperature-compensated (±60 ppm/°C max), factory-trimmed to ±10 mV, and provides up to 500 μA output current - sufficient for internal DAC bias and external scaling.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	12 bits - guarantees no missing codes; supports 4096 distinct digital output levels.
Input Range	0 V to +5 V unipolar - enables direct connection to standard 5 V sensor outputs without level-shifting.
SNR @ 10 kHz	72 dB min - ensures ≥11.6 effective bits of dynamic resolution for audio and instrumentation signals.
Conversion Time	8 μs max (external clock) - supports 100 kSPS sustained sampling rate with minimal dead time.
Data Access Time	57 ns max - compatible with fast 8-bit and 16-bit microprocessors (e.g., 80C51, TMS320C2x) without wait states.
Reference Output	3.00 V ±10 mV - stable, low-drift internal reference eliminates need for external voltage reference ICs.
Power Dissipation	60 mW typical (±5 V supplies) - suitable for low-power embedded systems with thermal constraints.

Pinout & Package

AD7875LPZ is housed in a 24-pin, 0.3 inch-wide plastic dual-in-line package (PDIP). Pin 1 is identified by a notch or dot; pins are numbered counterclockwise from the notch.

Pin/Terminal	Circuit Role	Design Meaning
1 RD	Read control input	Active-low signal enabling three-state data bus; synchronizes parallel data read with CS.
2 BUSY/INT	Status output	Active-low open-drain flag indicating conversion in progress (BUSY) or completion (INT).
3 CLK	Clock input	Accepts external TTL clock; tied to VSS to enable internal 2.5 MHz laser-trimmed oscillator.
4 DB11/HBEN	Multi-function I/O	DB11 output in 12-bit mode; HBEN (high-byte enable) control in byte mode for 8-bit bus interfacing.
5 DB10/SSTRB	Multi-function I/O	DB10 output in 12-bit mode; active-low serial strobe (SSTRB) for framing serial data transfers.
6 DB9/SCLK	Multi-function I/O	DB9 output in 12-bit mode; gated serial clock (SCLK) output requiring 2 kΩ pull-up resistor.
7 DB8/SDATA	Multi-function I/O	DB8 output in 12-bit mode; open-drain serial data (SDATA) output requiring 4.7 kΩ pull-up.
8–11 DB7/LOW–DB4/LOW	Configurable data outputs	Three-state outputs whose function (DB7–DB4 or upper byte) depends on 12/8/CLK and HBEN state.
12 DGND	Digital ground	Separate ground return for digital logic and interface circuitry to minimize noise coupling.
13–16 DB3/DB11–DB0/DB8	Configurable data outputs	Three-state outputs delivering LSB byte (DB3–DB0) or MSB byte (DB11–DB8) depending on mode.
17 VDD	Positive supply	+5 V ±5% supply for digital and analog circuitry; requires local 0.1 μF ceramic decoupling.
18 AGND	Analog ground	Isolated ground reference for track-and-hold, reference, and DAC; must be star-connected to DGND.
19 REF OUT	Reference output	3.00 V ±10 mV buried Zener reference; capable of sourcing 500 μA; max 50 pF capacitive load.
20 VIN	Analog input	Unipolar 0 V to +5 V input with 25 kΩ typical input resistance; accepts dc-coupled sensor signals.
21 VSS	Negative supply	−5 V ±5% supply for analog core; requires local 0.1 μF ceramic decoupling adjacent to pin.
22 12/8/CLK	Mode select input	Defines interface format: +5 V = 12-bit parallel only; 0 V/−5 V = byte or serial with gated/continuous SCLK.
23 CONVST	Convert start	Rising-edge-triggered asynchronous command initiating track-to-hold transition and conversion.
24 CS	Chip select	Active-low enable; when held low with CONVST tied low, initiates auto-conversion on CS falling edge.

Key Features

Feature	Design Value
Complete monolithic ADC	Integrates track-and-hold, SAR core, 3 V reference, and interface logic - no external components required beyond decoupling caps.
Laser-trimmed internal clock	Guarantees 6.5–9 μs conversion time without external timing components; reduces BOM count and layout complexity.
Three interface modes	Supports 12-bit parallel, two-byte (8-bit) parallel, and serial output - simplifies integration with diverse host processors and FPGAs.
72 dB SNR at 10 kHz	Validated dynamic performance enables high-fidelity digitization of audio, vibration, and sensor signals in industrial DAQ systems.
Unipolar 0 V to +5 V input	Matches standard industrial sensor and PLC output ranges; eliminates need for external level-shifting or biasing networks.

Applications

Industrial Data Acquisition	Test & Measurement Equipment
Use Scenario: Digitizing outputs from 4–20 mA transmitters, thermocouples, and strain gauges in programmable logic controllers (PLCs) and distributed I/O modules. IC Role / Device Role / Timing Role: Primary ADC capturing analog sensor data at up to 100 kSPS with 12-bit resolution and low harmonic distortion. Use Value: Enables direct interface to 0–5 V sensor outputs without signal conditioning; 72 dB SNR preserves signal integrity in noisy factory environments.	Use Scenario: Capturing waveforms in portable oscilloscopes, spectrum analyzers, and automated test equipment (ATE) with real-time processing. IC Role / Device Role / Timing Role: High-speed sampling front-end providing synchronized, low-latency digitization for FFT-based analysis. Use Value: 57 ns data access time allows tight timing alignment with FPGA or DSP controllers; serial interface reduces pin count in compact instruments.
DSP-Based Signal Processing	Medical Instrumentation
Use Scenario: Acquiring biomedical signals (ECG, EEG) in embedded digital signal processors where dynamic range and low distortion are critical. IC Role / Device Role / Timing Role: Precision ADC feeding real-time FIR/IIR filters and spectral analysis algorithms in resource-constrained platforms. Use Value: Guaranteed 72 dB SNR and −80 dB THD ensure accurate representation of low-amplitude physiological signals without aliasing artifacts.	Use Scenario: Digitizing pressure, flow, and oxygen saturation sensor outputs in patient monitors and infusion pumps requiring FDA-compliant accuracy. IC Role / Device Role / Timing Role: Safety-critical analog input stage delivering traceable dc accuracy (±1 LSB INL) and stable reference over temperature. Use Value: On-chip 3 V reference with ±60 ppm/°C tempco eliminates drift-related calibration errors across clinical operating temperatures (0°C to +50°C).

Industrial Data Acquisition

Test & Measurement Equipment

Use Scenario: Digitizing outputs from 4–20 mA transmitters, thermocouples, and strain gauges in programmable logic controllers (PLCs) and distributed I/O modules.

IC Role / Device Role / Timing Role: Primary ADC capturing analog sensor data at up to 100 kSPS with 12-bit resolution and low harmonic distortion.

Use Value: Enables direct interface to 0–5 V sensor outputs without signal conditioning; 72 dB SNR preserves signal integrity in noisy factory environments.

Use Scenario: Capturing waveforms in portable oscilloscopes, spectrum analyzers, and automated test equipment (ATE) with real-time processing.

IC Role / Device Role / Timing Role: High-speed sampling front-end providing synchronized, low-latency digitization for FFT-based analysis.

Use Value: 57 ns data access time allows tight timing alignment with FPGA or DSP controllers; serial interface reduces pin count in compact instruments.

DSP-Based Signal Processing

Medical Instrumentation

Use Scenario: Acquiring biomedical signals (ECG, EEG) in embedded digital signal processors where dynamic range and low distortion are critical.

IC Role / Device Role / Timing Role: Precision ADC feeding real-time FIR/IIR filters and spectral analysis algorithms in resource-constrained platforms.

Use Value: Guaranteed 72 dB SNR and −80 dB THD ensure accurate representation of low-amplitude physiological signals without aliasing artifacts.

Use Scenario: Digitizing pressure, flow, and oxygen saturation sensor outputs in patient monitors and infusion pumps requiring FDA-compliant accuracy.

IC Role / Device Role / Timing Role: Safety-critical analog input stage delivering traceable dc accuracy (±1 LSB INL) and stable reference over temperature.

Use Value: On-chip 3 V reference with ±60 ppm/°C tempco eliminates drift-related calibration errors across clinical operating temperatures (0°C to +50°C).

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit sampling ADC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD7870LN	Bipolar ±3 V input range; identical pinout, timing, and interface; same 72 dB SNR but different transfer function (two's complement).	Requires level-shifting for unipolar sensors; suited for differential or ac-coupled inputs in instrumentation amplifiers.	Select AD7870LN only if bipolar input range and two's complement coding are required; not drop-in for AD7875LPZ.
ADS7822U	12-bit SAR ADC with SPI interface only; 200 kSPS max; single +5 V supply; no internal reference (requires external 2.5 V ref).	Lower power (12 mW), smaller SO-8 package; lacks parallel/byte modes and integrated reference - increases system component count.	Choose ADS7822U for space-constrained, low-power designs where SPI is preferred and external reference is acceptable.

Compared with AD7875LPZ, AD7870LN offers bipolar input capability but requires redesign for unipolar signal chains, while ADS7822U reduces size and power but sacrifices interface flexibility and reference integration - making AD7875LPZ optimal for legacy microprocessor-based DAQ systems needing plug-and-play analog input.

Availability

AD7875LPZ is available at Aetrix Electronics and suitable for industrial data acquisition, test equipment, and medical instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD7875LPZ 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD787x family was designed as complete, easy-to-use 12-bit sampling ADCs for industrial and instrumentation applications demanding integrated references, flexible interfaces, and guaranteed dynamic performance - eliminating external timing and reference components.

FAQ

What is the analog input voltage range supported by the AD7875LPZ?

The AD7875LPZ supports a unipolar analog input range of 0 V to +5 V. This matches standard industrial sensor outputs and eliminates the need for external level-shifting circuitry. Input resistance is typically 25 kΩ, and the device maintains 12-bit linearity across this full range with ±5 LSB unipolar offset error and ±8 LSB full-scale error at +25°C.

Does the AD7875LPZ require an external clock source?

No, the AD7875LPZ does not require an external clock source. It includes a laser-trimmed internal oscillator that operates at approximately 2.5 MHz, guaranteeing conversion times of 6.5 μs minimum and 9 μs maximum. However, an external TTL-compatible clock can be applied to the CLK pin if precise timing synchronization or non-standard sample rates are needed.

What digital interface options does the AD7875LPZ support?

The AD7875LPZ supports three digital interface formats selected via the 12/8/CLK pin: 12-bit parallel word output, two 8-bit byte reads (with HBEN control), and serial data output using SDATA, SCLK, and SSTRB signals. All modes use standard control signals (CS, RD, CONVST) and are compatible with common microprocessors and DSPs without additional glue logic.

What is the purpose of the REF OUT pin on the AD7875LPZ?

The REF OUT pin on the AD7875LPZ provides a stable, temperature-compensated 3.00 V ±10 mV reference voltage derived from an on-chip buried Zener diode. It serves as the internal reference for the DAC and comparator, and can supply up to 500 μA to external circuitry - such as op-amp bias networks or scaled reference generation - provided the capacitive load remains ≤50 pF.

How is the AD7875LPZ packaged, and what are its thermal characteristics?

The AD7875LPZ is supplied in a 24-pin plastic dual-in-line package (PDIP) with 0.3 inch body width. Its absolute maximum junction temperature is +150°C, and it dissipates 60 mW typical power under ±5 V supplies. Power dissipation derates at 10 mW/°C above +75°C ambient, supporting reliable operation in industrial environments up to +70°C (J-grade) or +85°C (B/C-grade variants).

AD7875LPZ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 28-LCC (J-Lead)

Packaging:: Tube

Product Status:: Obsolete

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:: 0°C ~ 70°C

Supplier Device Package:: 28-PLCC (11.51x11.51)

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

AD7875LPZ FAQ

1.How can I place an order for AD7875LPZ through Aetrix?

Please submit a Request for Quotation (RFQ) for AD7875LPZ 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 AD7875LPZ reliable?

The price and inventory of AD7875LPZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7875LPZ is usually 5 days.

3.What payment methods are accepted for AD7875LPZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7875LPZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD7875LPZ?

AD7875LPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD7875LPZ 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 AD7875LPZ?

For technical support, including AD7875LPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7875LPZ requirements.

6.How does Aetrix verify that AD7875LPZ is sourced from the original manufacturer or authorized distributors?

All AD7875LPZ 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 AD7875LPZ meets industry standards.

7.What is the process for return or replacement of AD7875LPZ?

All AD7875LPZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7875LPZ, 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 AD7875LPZ part is unused and in its original packaging.

Return procedure for AD7875LPZ:

1.Submit a request within 90 days.

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

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