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Analog Devices Inc. AD7875KP
- Part No.:
- AD7875KP
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-LCC (J-Lead)
- Datasheet:
-
AD7875KP.pdf
- Description:
- IC ADC 12BIT SAR 28PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,880
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Product details
Overview
AD7875KP 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 supports unipolar 0 V to +5 V analog input range, delivers 72 dB SNR at 10 kHz, achieves 8 μs conversion time with external 2.5 MHz clock, and features 57 ns data access time for direct interfacing with 8-/16-bit microprocessors in data acquisition systems.
For engineers reviewing the AD7875KP datasheet, AD7875KP pinout, AD7875KP application, or AD7875KP equivalent, this page provides verified technical context, package-validated pin functions, real-world interface timing constraints, and confirmed alternative options for unipolar 12-bit sampling ADC replacement in industrial instrumentation and DSP front-end designs.
Technical Context
The AD7875KP implements a SAR architecture with a fast-settling voltage-output DAC and high-speed comparator, paired with a 2 μs track-and-hold amplifier that acquires full-scale signals to 12-bit accuracy. Its internal 3 V reference is laser-trimmed to ±10 mV and temperature-compensated to ±35 ppm/°C (L/C grade), enabling stable dc accuracy without external trimming.
It supports three digital output formats-parallel 12-bit word, two 8-bit bytes, or serial data via SDATA/SCLK/SSTRB-and uses asynchronous CONVST-triggered conversion control. The 12/8/CLK pin selects interface mode, while HBEN enables byte-mode data partitioning across DB7–DB0 and DB11–DB8 pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes guaranteed - ensures monotonic transfer function for precision measurement. |
| Sampling Rate | 100 kHz maximum - supports full-power signal digitization up to 50 kHz per Nyquist criterion. |
| SNR | 72 dB min at 10 kHz input - enables >11.6 effective bits for low-distortion audio and sensor signal capture. |
| Conversion Time | 8 μs max with 2.5 MHz external clock - defines minimum inter-conversion interval in high-throughput systems. |
| Analog Input Range | 0 V to +5 V unipolar - matches standard single-supply sensor outputs and PLC analog inputs. |
| Data Access Time | 57 ns max - allows direct connection to 80 ns–100 ns bus cycles of Intel 80C186 or Motorola 68HC11 derivatives. |
| Power Dissipation | 95 mW max at ±5 V supplies - enables thermally constrained embedded designs without forced cooling. |
| Reference Output | 3.00 V ±10 mV, 500 μA load capability - provides stable excitation for external ratiometric sensors or scaling circuits. |
Pinout & Package
AD7875KP is packaged in a 28-pin plastic leaded chip carrier (PLCC) with 0.050-inch pitch and JEDEC MS-026AC outline. Pin 1 is identified by a corner notch; all pins are gold-plated with solderable finish. Thermal pad is not present; power dissipation is managed via top-surface convection and PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Asynchronous convert start input | Rising-edge triggered; initiates track-to-hold transition and conversion independently of clock domain. |
| CS | Chip select input | Active-low enable for parallel/byte read operations; also starts conversion when CONVST tied low. |
| RD | Read strobe input | Active-low control for latching valid data onto DB[11:0] during Mode 1 or Mode 2 interface timing. |
| BUSY/INT | Status output | Open-drain active-low signal indicating conversion in progress (BUSY) or completion (INT). |
| DB0–DB11 | Three-state data outputs | Configurable as full 12-bit parallel, upper/lower byte, or serial data depending on 12/8/CLK and HBEN states. |
| VIN | Analog input terminal | Accepts 0 V to +5 V unipolar signal with 25 kΩ typical input resistance; referenced to AGND. |
| REF OUT | Internal reference output | 3.00 V ±10 mV source for external circuitry; requires ≤50 pF capacitive load for stability. |
| AGND / DGND | Analog and digital ground | Separate ground pins must be connected at single point near device to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Complete monolithic ADC | Integrates track-and-hold, 12-bit SAR core, 3 V reference, and parallel/serial interface - eliminates external support components. |
| Laser-trimmed internal clock | Guarantees 6.5–9 μs conversion time without external timing components; overrides possible with TTL clock on CLK pin. |
| Flexible digital interface | Supports 12-bit parallel, two-byte, or serial output - enables compatibility with 8-bit buses, DSP host ports, and space-constrained layouts. |
| Dynamic performance spec | 72 dB SNR and −80 dB THD tested at 10 kHz - validated for demanding ac-coupled signal chain applications like vibration monitoring. |
| Unipolar input optimization | 0 V to +5 V range with straight-binary coding and 1.22 mV/LSB step - simplifies firmware scaling and matches industrial sensor outputs. |
Applications
| Industrial Data Acquisition | Test & Measurement Equipment |
|---|---|
|
Use Scenario: Digitizing 4–20 mA loop outputs conditioned to 0–5 V in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Primary sampling ADC providing synchronized 100 kHz channel scanning with deterministic 8 μs conversion latency. Use Value: Eliminates need for external reference and track-and-hold, reducing BOM count by ≥4 components and improving long-term gain drift stability. |
Use Scenario: Capturing transient waveforms in portable oscilloscopes and spectrum analyzers with 12-bit vertical resolution. IC Role / Device Role / Timing Role: Front-end ADC delivering 72 dB SNR at 10 kHz and supporting serial streaming to FPGA-based acquisition buffers. Use Value: Enables >11 ENOB performance without external dithering or averaging, preserving signal fidelity in battery-powered instruments. |
| DSP-Based Motor Control | Medical Sensor Interface |
|
Use Scenario: Sampling current feedback signals from shunt resistors in servo drive inverters using isolated amplifiers with 0–5 V output. IC Role / Device Role / Timing Role: High-speed ADC interfaced directly to TMS320F28335 EMIF bus with 57 ns access time and RD/CS handshaking. Use Value: Matches processor bus timing without wait states, enabling real-time current loop update rates up to 25 kHz per phase. |
Use Scenario: Converting amplified ECG or EEG bio-potential signals in patient monitors where low-noise, dc-coupled acquisition is required. IC Role / Device Role / Timing Role: Precision ADC with 3 V internal reference used to ratiometrically scale sensor gain stages and reject supply ripple. Use Value: Provides ±1 LSB integral nonlinearity and <±5 LSB offset error over 0°C to +70°C - meets IEC 60601-2-27 linearity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit unipolar sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7870KP | Bipolar ±3 V input range; twos-complement output; same pinout and timing but incompatible input scaling. | Requires level-shifting for 0–5 V sensors; unsuitable for direct replacement without analog front-end redesign. | Select only if system already uses bipolar signal conditioning and can accommodate twos-complement arithmetic. |
| ADS7822U | 12-bit SAR ADC with SPI interface only; 200 kSPS max; no internal reference; requires external 2.5 V reference. | Lower power (12 mW), smaller MSOP-8 package, but lacks parallel/byte modes and on-chip reference. | Prefer for new ultra-low-power or space-constrained designs where SPI interface is acceptable and external reference is available. |
Compared with AD7875KP, AD7870KP demands analog signal re-biasing and firmware sign-extension handling, while ADS7822U reduces board area and power but increases BOM complexity and removes microprocessor bus compatibility.
Availability
AD7875KP is available at Aetrix Electronics and suitable for industrial data acquisition, test equipment, and motor control applications requiring stable component supply, long-lifecycle assurance, and traceable sourcing from original manufacturer channels.
Supply support for AD7875KP 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control systems.
The AD787x family was designed for high-accuracy, self-contained data acquisition in industrial and instrumentation environments where integration, dynamic performance, and supply simplicity are critical.
FAQ
What is the maximum recommended capacitive load on the REF OUT pin of the AD7875KP?
The AD7875KP REF OUT pin must be loaded with ≤50 pF capacitance for stable operation. Exceeding this value risks oscillation or reference voltage droop during conversion. If external filtering is needed, use a 200 Ω series resistor followed by a parallel 10 μF tantalum and 0.1 μF ceramic capacitor - as specified in the AD7875KP datasheet Figure 6. This configuration isolates switching transients while maintaining regulation.
Does the AD7875KP support simultaneous sampling across multiple channels?
No, the AD7875KP is a single-channel ADC and does not support simultaneous sampling. It performs successive approximation on one analog input (VIN) per conversion cycle. For multi-channel systems, external multiplexing or multiple AD7875KP units with synchronized CONVST signals are required. Its 2 μs track-and-hold acquisition time applies only to the selected channel.
Can the AD7875KP operate with only a +5 V supply, or does it require dual ±5 V rails?
The AD7875KP requires both +5 V (VDD) and −5 V (VSS) supplies for proper operation - it cannot function on +5 V alone. The negative rail powers the internal track-and-hold amplifier and comparator circuitry. Operating with only +5 V will result in undefined behavior, failure to acquire, or permanent damage due to violation of absolute maximum ratings.
What is the meaning of the 'KP' suffix in AD7875KP?
The 'KP' suffix in AD7875KP denotes the 28-pin plastic leaded chip carrier (PLCC) package with commercial temperature range (0°C to +70°C) and lead-free finish. It corresponds to the 'K' grade (0°C to +70°C) and 'P' package type per Analog Devices' ordering guide - distinct from 'KPZ' (tape-and-reel) or 'KQ' (ceramic DIP) variants.
How is the 12-bit output formatted for the AD7875KP when using unipolar 0 V to +5 V input?
The AD7875KP outputs straight-binary code for unipolar input: 0x000 (0 V) maps to decimal 0, and 0xFFF (+5 V) maps to decimal 4095. Each LSB equals 1.22 mV (5 V / 4096). This differs from the AD7870KP's twos-complement format and ensures intuitive firmware interpretation without sign-bit handling.
AD7875KP 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:
- -
AD7875KP FAQ
1.How can I place an order for AD7875KP through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7875KP 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 AD7875KP reliable?
The price and inventory of AD7875KP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7875KP is usually 5 days.
3.What payment methods are accepted for AD7875KP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7875KP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7875KP?
AD7875KP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7875KP 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 AD7875KP?
For technical support, including AD7875KP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7875KP requirements.
6.How does Aetrix verify that AD7875KP is sourced from the original manufacturer or authorized distributors?
All AD7875KP 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 AD7875KP meets industry standards.
7.What is the process for return or replacement of AD7875KP?
All AD7875KP units undergo pre-shipment inspection (PSI). If there is an issue with AD7875KP, 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 AD7875KP part is unused and in its original packaging.
Return procedure for AD7875KP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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