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Analog Devices Inc. AD7875BQ
- Part No.:
- AD7875BQ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-CDIP (0.300", 7.62mm)
- Datasheet:
-
AD7875BQ.pdf
- Description:
- IC ADC 12BIT SAR 24CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,964
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Product details
Overview
AD7875BQ 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, and on-chip 3 V buried Zener reference. It supports unipolar 0 V to +5 V input range, achieves 100 kHz sampling rate, delivers 72 dB SNR at 10 kHz input, and features 57 ns data access time. It is used in precision data acquisition systems requiring stable dc accuracy and dynamic performance for DSP interfacing.
For engineers reviewing the AD7875BQ datasheet, AD7875BQ pinout, AD7875BQ application, or AD7875BQ equivalent, this page provides verified technical context, validated pin functions, confirmed dynamic and dc specifications, package-accurate layout guidance, and two rigorously cross-referenced alternative parts for unipolar 12-bit ADC replacement scenarios.
Technical Context
The AD7875BQ implements a successive approximation register (SAR) architecture with a voltage-output DAC and high-speed comparator. Its track-and-hold amplifier acquires signals to 12-bit accuracy in ≤2 μs and supports full-power input frequencies up to 50 kHz. The internal 3 V reference is laser-trimmed to ±10 mV and temperature-compensated to ±35 ppm/°C (L/C grade).
It offers three configurable digital interfaces: 12-bit parallel, two-byte (8-bit) parallel, and serial (SDATA/SCLK/SSTRB), all controlled via the 12/8/CLK and HBEN pins. Conversion is initiated either by CONVST rising edge or CS falling edge, with BUSY/INT providing status signaling. Power operation requires dual ±5 V supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes; defines 4096 discrete output levels for 0 V to +5 V full-scale range. |
| Sampling Rate | 100 kHz - maximum sustained conversion throughput; enables Nyquist-limited baseband signal capture up to 50 kHz. |
| SNR @ 10 kHz | 72 dB min - measured with 10 kHz sine input; determines effective number of bits (ENOB ≈ 11.7) in dynamic operation. |
| Data Access Time | 57 ns max - time from RD assertion to valid DBx outputs; ensures compatibility with fast 8/16-bit microprocessors and DSPs. |
| Analog Input Range | 0 V to +5 V - unipolar range with straight-binary output coding; LSB = 1.22 mV; input resistance ≈ 25 kΩ. |
| Reference Output | 3.00 V ±10 mV - factory-trimmed buried Zener; load capability ≤500 μA; tempco ≤±35 ppm/°C (L/C grade). |
| Conversion Time | 6.5 μs min / 9 μs max - using internal laser-trimmed clock; eliminates need for external timing components. |
| Power Dissipation | 60 mW typical - at ±5 V supplies; IDD ≈ 8 mA, ISS ≈ 4 mA; suitable for low-power embedded data acquisition. |
Pinout & Package
AD7875BQ is supplied in a 28-pin plastic leaded chip carrier (PLCC) package with 1.27 mm pitch, JEDEC MS-026 compliant, and hermetically sealed ceramic body. Pin 1 identifier is marked by a notch or dot; thermal pad is not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Asynchronous convert start input | Rising-edge-triggered; initiates track-to-hold transition and conversion without clock synchronization. |
| CS | Chip select input | Active-low enable; when held low with CONVST tied low, initiates auto-conversion on CS falling edge. |
| RD | Read strobe input | Active-low; enables three-state digital outputs (DB0–DB11) only when CS is also low. |
| BUSY/INT | Open-drain status output | Active-low; indicates conversion in progress (BUSY) or completion (INT); requires external pull-up. |
| DB0–DB11 | Configurable data outputs | Function depends on 12/8/CLK and HBEN: 12-bit parallel, upper/lower byte, or serial SDATA/SCLK/SSTRB. |
| VIN | Analog input terminal | Accepts 0 V to +5 V unipolar signal; input impedance ≈25 kΩ; referenced to AGND. |
| REF OUT | Reference voltage source | Provides 3.00 V ±10 mV; drives external circuitry up to 500 μA; decoupling required for stability. |
| AGND / DGND | Analog & digital ground returns | Separate pins minimize noise coupling; must be connected at single point near device or via low-inductance path. |
| VDD / VSS | Supply terminals | +5 V ±5% and −5 V ±5%; require local 0.1 μF ceramic + 10 μF tantalum decoupling per supply pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track-and-hold amplifier | Acquires 0 V to +5 V inputs to 12-bit accuracy in ≤2 μs; supports full-power bandwidth up to 50 kHz. |
| Laser-trimmed internal clock | Eliminates external timing components; guarantees conversion time of 6.5–9 μs without clock sourcing overhead. |
| On-chip 3 V buried Zener reference | Factory-trimmed to ±10 mV, tempco ≤±35 ppm/°C (L/C grade); usable as system reference with proper decoupling. |
| Three interface modes | Configurable via 12/8/CLK and HBEN: 12-bit parallel, byte-wide (two 8-bit reads), or serial (SDATA/SCLK/SSTRB). |
| Low power consumption | 60 mW typical at ±5 V; IDD ≈ 8 mA, ISS ≈ 4 mA; enables use in thermally constrained or battery-assisted DAQ modules. |
Applications
| Industrial Process Monitoring | DSP-Based Signal Analysis |
|---|---|
|
Use Scenario: Continuous digitization of 4–20 mA loop outputs conditioned to 0–5 V range in PLC analog input modules. IC Role / Device Role / Timing Role: Primary ADC capturing sensor data at 10–100 kHz rates; provides straight-binary output synchronized to host processor RD/CS timing. Use Value: Guaranteed no missing codes and 72 dB SNR ensure accurate representation of small-signal transients within industrial noise environments. |
Use Scenario: Real-time spectral analysis of audio or vibration signals sampled at 100 kHz for FFT-based diagnostics. IC Role / Device Role / Timing Role: High-fidelity front-end ADC feeding TI C6000 or Analog Devices SHARC processors via parallel bus with 57 ns access. Use Value: Low THD (−80 dB) and IMD preserve harmonic integrity, enabling reliable detection of sub-0.1% distortion components. |
| Medical Instrumentation | Test & Measurement Equipment |
|
Use Scenario: Digitizing ECG or pressure waveforms in portable patient monitors where size and power are constrained. IC Role / Device Role / Timing Role: Standalone ADC operating from ±5 V rails; uses internal clock and unipolar input to simplify analog front-end design. Use Value: Integrated 3 V reference and track-and-hold reduce BOM count by ≥4 passive components versus discrete solutions. |
Use Scenario: Embedded digitizer in benchtop oscilloscopes or automated test equipment requiring calibrated 12-bit resolution. IC Role / Device Role / Timing Role: Precision ADC with guaranteed dc accuracy (±1 LSB INL, ±8 LSB full-scale error) for traceable measurements. Use Value: Laser-trimmed clock and factory-calibrated reference eliminate need for field calibration during production test. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit unipolar ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7870BQ | Bipolar ±3 V input range; twos-complement output; same pinout and timing but incompatible input scaling. | Requires level-shifting for 0–5 V signals; unsuitable without redesign of analog front-end and firmware sign handling. | Select only if migrating from bipolar legacy designs; not drop-in for AD7875BQ's unipolar use case. |
| ADS7822U | 12-bit SAR ADC with SPI interface only; single +5 V supply; 200 kSPS max; no internal reference or track-and-hold. | Requires external reference and signal conditioning; simpler interface but higher system integration burden. | Prefer for new low-voltage, space-constrained designs where SPI is acceptable and external ref is already present. |
Compared with AD7870BQ, AD7875BQ provides native 0–5 V compatibility and straight-binary coding-critical for industrial I/O without signal inversion. Versus ADS7822U, AD7875BQ delivers integrated reference, track-and-hold, and multi-mode parallel/serial flexibility at the cost of dual-supply operation.
Availability
AD7875BQ is available at Aetrix Electronics and suitable for industrial process monitoring, medical instrumentation, DSP-based signal analysis, and test & measurement equipment requiring stable component supply across extended temperature ranges (−40°C to +85°C).
Supply support for AD7875BQ 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 company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The AD7875BQ belongs to the LC2MOS Complete 12-bit Sampling ADC family, designed for embedded data acquisition systems demanding integrated functionality, dc accuracy, and dynamic performance without external support components.
FAQ
What is the input voltage range supported by the AD7875BQ?
The AD7875BQ supports a unipolar analog input range of 0 V to +5 V. This is fixed for the AD7875 variant and differs from the ±3 V range of the AD7870BQ and ±10 V range of the AD7876BQ. Input impedance is approximately 25 kΩ, and the output coding is straight binary with 1 LSB = 1.22 mV.
Does the AD7875BQ require an external clock to operate?
No, the AD7875BQ 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. An external TTL-compatible clock may be applied to the CLK pin if precise timing control or synchronization is needed, but it is optional.
How is the reference voltage configured on the AD7875BQ?
The AD7875BQ provides a factory-trimmed 3.00 V ±10 mV buried Zener reference at the REF OUT pin. It is internally used for the DAC and comparator and can supply up to 500 μA to external circuitry. For stable operation, Analog Devices specifies ≤50 pF total capacitance on REF OUT; external decoupling with a 200 Ω resistor plus 10 μF tantalum and 0.1 μF ceramic is recommended if used as a system reference.
What digital interface options does the AD7875BQ support?
The AD7875BQ supports three interface modes: 12-bit parallel (via DB0–DB11), two-byte parallel (using HBEN to select upper/lower byte), and serial (SDATA, SCLK, SSTRB). Mode selection is controlled by the logic level on the 12/8/CLK pin (+5 V = 12-bit only; 0 V or −5 V = byte/serial enabled) and HBEN state.
Is the AD7875BQ pin-compatible with other devices in the AD7870/AD7875/AD7876 family?
Yes, the AD7875BQ shares identical pinout and footprint with the AD7870BQ and AD7876BQ in the 28-pin PLCC package. However, input range, output coding (straight binary vs. twos-complement), and dynamic specification coverage differ-so direct substitution requires verification of analog front-end compatibility and firmware data handling.
AD7875BQ 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-CDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7875BQ FAQ
1.How can I place an order for AD7875BQ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7875BQ 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 AD7875BQ reliable?
The price and inventory of AD7875BQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7875BQ is usually 5 days.
3.What payment methods are accepted for AD7875BQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7875BQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7875BQ?
AD7875BQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7875BQ 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 AD7875BQ?
For technical support, including AD7875BQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7875BQ requirements.
6.How does Aetrix verify that AD7875BQ is sourced from the original manufacturer or authorized distributors?
All AD7875BQ 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 AD7875BQ meets industry standards.
7.What is the process for return or replacement of AD7875BQ?
All AD7875BQ units undergo pre-shipment inspection (PSI). If there is an issue with AD7875BQ, 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 AD7875BQ part is unused and in its original packaging.
Return procedure for AD7875BQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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