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Analog Devices Inc. AD7875KR
- Part No.:
- AD7875KR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7875KR.pdf
- Description:
- IC ADC 12BIT 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,820
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Product details
Overview
AD7875KR from Analog Devices is a complete monolithic 12-bit successive approximation analog-to-digital converter (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 provides parallel/byte/serial digital interfaces for microprocessor and DSP interfacing in data acquisition systems.
For engineers reviewing the AD7875KR datasheet, AD7875KR pinout, AD7875KR application, or AD7875KR equivalent, this page delivers verified technical context, real-world interface timing values, confirmed package mapping to 24-pin DIP, validated alternative parts with documented functional differences, and precise design meanings for dynamic and dc accuracy parameters - all specific to the AD7875KR variant.
Technical Context
The AD7875KR implements a SAR architecture with internal 3 V reference and 2 μs track-and-hold acquisition, enabling full-power signal conversion up to 50 kHz. Its internal clock is laser-trimmed to guarantee 6.5–9 μs conversion time without external components, and it supports three output formats: 12-bit parallel, two 8-bit bytes, or serial data via open-drain SCLK/SDATA/SSTRB outputs.
Digital control uses asynchronous CONVST for conversion start and active-low CS/RD for parallel read access, with BUSY/INT indicating conversion status. The device operates from ±5 V supplies and features separate AGND and DGND pins to maintain analog signal integrity during high-speed digital transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes; defines minimum quantization step of 1.22 mV for 0 V to +5 V input range. |
| Conversion Time | 8 μs max with 2.5 MHz external clock - sets maximum sampling rate at 100 kHz for continuous operation. |
| SNR | 72 dB min at 10 kHz input - ensures usable dynamic range for audio and instrumentation signals below Nyquist limit. |
| Analog Input Range | 0 V to +5 V unipolar - matches standard logic-level sensor outputs and eliminates need for level-shifting circuitry. |
| Data Access Time | 57 ns max after RD assertion - enables direct connection to fast 8-bit/16-bit microprocessors without wait-state insertion. |
| Reference Output | 3.00 V ±10 mV - stable internal Zener reference usable for external scaling or as system reference with ≤500 μA load. |
| Power Dissipation | 60 mW typical at ±5 V - supports low-heat-generation designs in space-constrained industrial modules. |
Pinout & Package
The AD7875KR is packaged in a 24-pin, 0.3 inch-wide plastic dual-in-line package (PDIP), with pin 1 identified by notch or dot. All pins are TTL-compatible and support mixed-signal PCB layout with separate analog/digital ground planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RD | Digital Read Control | Active-low signal enabling DB0–DB11 outputs; must be asserted after CS to latch valid conversion data. |
| BUSY/INT | Status Output | Open-drain active-low indicator: BUSY during conversion, INT upon completion - requires external pull-up. |
| CONVST | Asynchronous Start | Rising-edge-triggered conversion initiation; independent of CLK, enabling precise sampling timing control. |
| CS | Chip Select | Active-low enable for digital interface; when held low with CONVST tied low, initiates auto-conversion on each CS falling edge. |
| VIN | Analog Input | Unipolar 0 V to +5 V input node with 25 kΩ typical input resistance; referenced to AGND, not DGND. |
| REF OUT | Internal Reference | 3.00 V ±10 mV Zener output; capable of sourcing ≤500 μA; requires ≤50 pF capacitance for stability. |
| AGND | Analog Ground | Return path for track-and-hold, DAC, and reference circuits; must be isolated from DGND except at single-point star ground. |
| DGND | Digital Ground | Return path for logic outputs and control inputs; decoupled separately from AGND to prevent digital noise coupling. |
| VDD / VSS | Power Supplies | +5 V ±5% and −5 V ±5% analog supplies; require local 0.1 μF ceramic + 10 μF tantalum decoupling per supply pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Track-and-Hold | Acquires 0 V to +5 V input to 12-bit accuracy in ≤2 μs - eliminates need for external sample-hold IC in medium-speed DAQ systems. |
| Laser-Trimmed Internal Clock | Guarantees 6.5–9 μs conversion time without external timing components - reduces BOM count and layout complexity. |
| Three-Format Digital Interface | Supports 12-bit parallel, byte-mode (HBEN-controlled), and serial (SCLK/SDATA/SSTRB) outputs - enables flexible integration with legacy 8-bit buses or modern serial controllers. |
| On-Chip 3 V Buried Zener Reference | Factory-trimmed to ±10 mV accuracy with ±35 ppm/°C tempco - provides stable reference without external voltage source or trimming potentiometers. |
| Separate AGND/DGND Pins | Enables clean analog signal path isolation from digital switching noise - critical for achieving specified 72 dB SNR in mixed-signal PCB layouts. |
Applications
| Industrial Data Acquisition | Test & Measurement Equipment |
|---|---|
Use Scenario: High-accuracy voltage monitoring of PLC analog I/O modules operating in noisy factory environments. IC Role / Device Role / Timing Role: Primary ADC converting 0–5 V sensor outputs (e.g., pressure transducers, RTD conditioners) into digital data for microcontroller processing. Use Value: 72 dB SNR and ±1 LSB integral nonlinearity ensure <0.025% measurement error across full scale, meeting IEC 61000-4-3 immunity requirements. | Use Scenario: Digitizing waveform outputs from benchtop function generators and oscilloscope front-ends. IC Role / Device Role / Timing Role: Standalone sampling ADC capturing transient signals up to 50 kHz with precise trigger synchronization via CONVST. Use Value: 2 μs track-and-hold acquisition and 57 ns data access time allow accurate capture of fast edges without aperture jitter degradation. |
| Medical Instrumentation | DSP-Based Signal Processing |
Use Scenario: Analog front-end for portable ECG monitors requiring low power and high dc accuracy. IC Role / Device Role / Timing Role: Unipolar ADC digitizing amplified biopotential signals (0–5 V range) with minimal external components. Use Value: Integrated 3 V reference and on-chip track-and-hold eliminate calibration drift and reduce component count versus discrete solutions. | Use Scenario: Real-time spectral analysis in embedded audio analyzers using fixed-point DSPs. IC Role / Device Role / Timing Role: High-fidelity ADC feeding 100 kSPS data streams into TI C5000 or Analog Devices SHARC processors via parallel bus. Use Value: 57 ns access time and guaranteed timing specs over −40°C to +85°C enable deterministic interrupt-driven sampling without FIFO buffering. |
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 |
|---|---|---|---|
| AD7870KR | Bipolar ±3 V input range; identical pinout, timing, and package; same 72 dB SNR but different transfer function (two's complement). | Requires input signal centering at 0 V; unsuitable for unipolar sensors without external level-shifting. | Select AD7870KR only when interfacing bipolar transducers (e.g., accelerometers) and maintaining backward compatibility with existing ±3 V designs. |
| AD7876KR | Bipolar ±10 V input range; same architecture and timing; higher full-scale step (4.88 mV) and different input impedance (33 kΩ). | Designed for industrial process control with 4–20 mA loop receivers; incompatible with 0–5 V sensor outputs without attenuation. | Choose AD7876KR for high-voltage industrial analog inputs; avoid for AD7875KR's native 0–5 V domain due to input range mismatch. |
Compared with AD7870KR and AD7876KR, the AD7875KR uniquely supports unipolar 0–5 V inputs with straight-binary coding, eliminating level-shifting circuitry and simplifying firmware handling for microcontrollers expecting unsigned integer data.
Availability
AD7875KR is available at Aetrix Electronics and suitable for industrial data acquisition, test equipment, medical instrumentation, and DSP-based signal processing requiring stable component supply across extended temperature ranges.
Supply support for AD7875KR 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, with design centers worldwide.
The AD787x family was engineered for precision, medium-speed data acquisition in resource-constrained embedded systems - emphasizing integration (on-chip reference, clock, T/H), low power, and flexible digital interfacing without external support components.
FAQ
What is the analog input voltage range supported by the AD7875KR?
The AD7875KR supports a unipolar analog input range of 0 V to +5 V referenced to AGND. This is distinct from the AD7870KR (±3 V) and AD7876KR (±10 V). Input resistance is typically 25 kΩ, and the output code format is straight binary with 1 LSB = 1.22 mV. Exceeding this range may cause clipping or damage per absolute maximum ratings.
Does the AD7875KR require an external clock to operate?
No, the AD7875KR does not require an external clock. It includes a laser-trimmed internal oscillator that guarantees conversion times of 6.5 μs minimum and 9 μs maximum. However, an external 2.5 MHz TTL-compatible clock can be applied to the CLK pin for tighter timing control or synchronization with system clocks - in which case conversion time is 8 μs maximum.
How is the reference voltage used in the AD7875KR?
The AD7875KR provides a 3.00 V ±10 mV buried Zener reference at the REF OUT pin, used internally for the DAC and comparator. It can source up to 500 μA for external scaling circuits (e.g., generating 5 V or 10 V references via resistor dividers), but total capacitance on REF OUT must not exceed 50 pF to ensure stability during conversion cycles.
What digital interface modes does the AD7875KR support?
The AD7875KR supports three digital interface modes selected via the 12/8/CLK pin: (1) 12-bit parallel output (12/8/CLK = +5 V), (2) two 8-bit byte transfers controlled by HBEN (12/8/CLK = 0 V), and (3) serial output using SDATA, SCLK, and SSTRB (12/8/CLK = −5 V). All modes use RD, CS, and BUSY/INT for handshaking.
What is the purpose of separate AGND and DGND pins on the AD7875KR?
The AD7875KR uses separate AGND and DGND pins to isolate analog signal paths from digital switching noise. AGND serves as the return for VIN, REF OUT, and internal analog circuitry; DGND serves digital outputs and control inputs. They must connect at a single point (typically near power supply decoupling) to prevent ground loops while maintaining SNR performance - critical for achieving the specified 72 dB SNR.
AD7875KR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7875KR FAQ
1.How can I place an order for AD7875KR through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7875KR 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 AD7875KR reliable?
The price and inventory of AD7875KR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7875KR is usually 5 days.
3.What payment methods are accepted for AD7875KR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7875KR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7875KR?
AD7875KR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7875KR 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 AD7875KR?
For technical support, including AD7875KR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7875KR requirements.
6.How does Aetrix verify that AD7875KR is sourced from the original manufacturer or authorized distributors?
All AD7875KR 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 AD7875KR meets industry standards.
7.What is the process for return or replacement of AD7875KR?
All AD7875KR units undergo pre-shipment inspection (PSI). If there is an issue with AD7875KR, 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 AD7875KR part is unused and in its original packaging.
Return procedure for AD7875KR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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