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Analog Devices Inc. AD7880BQ
- Part No.:
- AD7880BQ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-CDIP (0.300", 7.62mm)
- Datasheet:
-
AD7880BQ.pdf
- Description:
- IC ADC 12BIT MONO LP 24-CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:190
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Product details
Overview
AD7880BQ from Analog Devices is a 12-bit monolithic successive-approximation ADC operating from a single +5 V supply, featuring 12 µs conversion time, 3 µs track/hold acquisition, and 70 dB SNR at 66 kHz sampling rate. It supports unipolar (0 V to 5 V, 0 V to 10 V) and bipolar (±5 V) input ranges and targets high-speed data acquisition in portable instrumentation and DSP systems.
For engineers reviewing the AD7880BQ datasheet, AD7880BQ pinout, AD7880BQ application, or AD7880BQ equivalent, key selection criteria include its LC2MOS process-based low-power operation (2 mW in power-save mode), 24-pin Cerdip package compatibility, three-state parallel interface timing (57 ns data access), and verified dynamic performance across speech, modem, and control applications.
Technical Context
The AD7880BQ integrates a charge-balanced comparator for inherent track-and-hold functionality, a 12-bit voltage-output DAC, and TTL/CMOS-compatible control logic synchronized to an external 2.5 MHz CLKIN. Its conversion cycle initiates on the rising edge of CONVST and completes in ≤12 µs using 26–28 clock periods.
Input range selection is achieved via external connections of VINA, VINB, and VREF - no internal register programming required. The MODE pin enables hardware-controlled power-down (MODE = 0 V), reducing IDD to 750 µA while preserving state for fast wake-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit straight binary output; delivers 4096 discrete codes with 1.22 mV LSB (0–5 V range). |
| Conversion Time | 12 µs max at 2.5 MHz CLKIN; enables 66 kHz sustained throughput for real-time signal capture. |
| Track/Hold Acquisition | 3 µs max; ensures full 12-bit settling for input signals up to ~100 kHz bandwidth. |
| Signal-to-Noise Ratio | 70 dB min at 1 kHz input, 66 kHz sampling; confirms usable dynamic range for audio and telecom signals. |
| Power Dissipation | 2 mW typ in power-save mode (MODE = 0 V); enables battery operation in handheld test equipment. |
| Analog Input Ranges | Three user-configurable ranges: 0–5 V, 0–10 V, ±5 V - all supported with single +5 V supply and no external op amps. |
| Data Access Time | 57 ns max after RD assertion; compatible with 16-bit microprocessors (e.g., MC68000, TMS320C25) without wait states. |
Pinout & Package
AD7880BQ is housed in a 24-lead Cerdip (Q-24) package with 0.3-inch DIP footprint, hermetically sealed for industrial reliability across –40°C to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA / VINB | Differential analog input pair | Selects input range configuration (unipolar/bipolar) via external wiring per Figures 5–7. |
| AGND / DGND | Separate analog and digital ground pins | Enables noise isolation between sensitive analog front-end and noisy digital bus drivers. |
| CONVST | Asynchronous conversion start trigger | Rising-edge initiated; independent of CS/RD timing - allows precise sampling synchronization with external timers or DSPs. |
| RD / CS | Parallel bus enable controls | CS low + RD low activates DB0–DB11 outputs; three-state when inactive - prevents bus contention. |
| BUSY | Active-low conversion status flag | Stays low during conversion; transitions high to signal data readiness - usable as interrupt source (e.g., ADSP-2100 IRQ). |
| MODE | Power mode selector | Logic high (VDD) = normal operation; logic low (0 V) = power-save mode (750 µA IDD). |
| DB0–DB11 | 12-bit parallel data outputs | Three-state, TTL-compatible; driven only when CS and RD are both asserted low. |
Key Features
| Feature | Design Value |
|---|---|
| Single +5 V supply operation | Eliminates need for dual ±5 V rails or reference buffers - simplifies power design in portable systems. |
| Hardware-selectable input ranges | 0–5 V, 0–10 V, and ±5 V configured by external pin wiring - no software overhead or calibration registers. |
| LC2MOS process integration | Combines precision bipolar front-end with low-power CMOS logic - achieves 70 dB SNR with 25 mW typical dissipation. |
| Fast 15 µs total throughput time | Sum of 12 µs conversion + 3 µs acquisition - supports full-power 33 kHz sine wave digitization at 66 kHz sample rate. |
| Standard microprocessor interface | TTL/CMOS-compatible CONVST, RD, CS, BUSY, and DB0–DB11 - directly interfaces to ADSP-2100, TMS320C25, MC68000, and 8086 without glue logic. |
Applications
| Portable Data Loggers | Digital Signal Processing Front-End |
|---|---|
Use Scenario: Battery-powered environmental sensor nodes capturing temperature, pressure, and vibration waveforms over extended field deployments. IC Role / Device Role / Timing Role: Primary analog-to-digital converter acquiring synchronized multi-channel samples at 10–50 kHz rates with minimal power draw. Use Value: 2 mW power-save mode extends battery life; 3 µs track/hold ensures accurate capture of transient mechanical events. | Use Scenario: Real-time spectral analysis in voice recognition modules where analog microphone signals require high-fidelity digitization prior to FFT processing. IC Role / Device Role / Timing Role: High-SNR front-end ADC feeding fixed-point DSPs (e.g., TMS320C25) with deterministic 15 µs latency per sample. Use Value: 70 dB SNR and –80 dB THD preserve signal integrity for sub-12 kHz voice band analysis without post-processing correction. |
| High-Speed Modem Analog Interface | Industrial Control Loop Sampling |
Use Scenario: Fax/data modems requiring precise analog line signal conditioning and echo cancellation feedback paths. IC Role / Device Role / Timing Role: Dual-role ADC for simultaneous receive-path digitization and transmit-path monitoring at 66 kHz sampling. Use Value: Configurable ±5 V input range accommodates line driver/receiver swing; 57 ns data access enables tight timing margins in full-duplex designs. | Use Scenario: Closed-loop motor control systems sampling current, voltage, and position feedback in real time for PWM update cycles. IC Role / Device Role / Timing Role: Deterministic latency ADC interfaced to microcontrollers (e.g., MC68000) via standard parallel bus for jitter-free sampling triggers. Use Value: Asynchronous CONVST allows precise alignment with PWM zero-crossing events; BUSY flag enables interrupt-driven read without polling overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit parallel-output ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7880CN | Same architecture and pinout; tighter DC accuracy (±5 LSB full-scale error vs. ±15 LSB for AD7880BQ). | Preferred for precision measurement systems requiring calibrated offset/FS adjustment; same power and speed specs. | Select AD7880CN when system-level calibration budget is constrained and higher initial accuracy is mandatory. |
| MAX195BCNG+ | 16-bit resolution, serial SPI interface, 1.25 µs conversion; requires external reference and level-shifting for +5 V systems. | Suited for higher-resolution, lower-throughput applications where board space and serial interface are prioritized over parallel bus simplicity. | Choose MAX195BCNG+ only if resolution >12 bits is required and system can accommodate SPI timing and reference management overhead. |
Compared with AD7880CN, AD7880BQ trades initial DC accuracy for broader industrial tolerance and cost efficiency; compared with MAX195BCNG+, it offers deterministic parallel timing and simpler +5 V system integration at the expense of resolution and conversion speed.
Availability
AD7880BQ is available at Aetrix Electronics and suitable for portable instrumentation, digital signal processing front-ends, and industrial control loop sampling requiring stable component supply across extended production lifecycles.
Supply support for AD7880BQ 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 AD7880 product line was designed for high-speed, low-power data acquisition in resource-constrained embedded systems - emphasizing single-supply operation, hardware-configurable ranges, and direct microprocessor interoperability.
FAQ
What is the maximum sampling rate supported by the AD7880BQ?
The AD7880BQ supports a maximum sustained sampling rate of 66 kHz, enabled by its 12 µs conversion time and 3 µs track/hold acquisition, yielding a total throughput time of 15 µs. This allows full-power digitization of input signals up to 33 kHz under Nyquist criteria. The part is specified with a 2.5 MHz CLKIN, and performance degrades gradually at lower clock frequencies due to hold capacitor leakage.
Does the AD7880BQ require an external reference voltage?
No, the AD7880BQ does not require an external reference voltage for basic operation. Its VREF pin is typically tied to VDD (+5 V), enabling all three input ranges (0–5 V, 0–10 V, ±5 V) from a single supply. While it can operate with VREF as low as 2.5 V, SNR degrades below 5 V - Figure 3 in the datasheet shows SNR dropping from 70 dB at 5 V to ~62 dB at 2.5 V.
How does the MODE pin affect power consumption in the AD7880BQ?
The MODE pin directly controls power state: when pulled to VDD, the AD7880BQ operates in normal mode (7.5 mA IDD typ, 37.5 mW). When pulled to 0 V, it enters power-save mode, reducing IDD to 750 µA typ (3.75 mW) while retaining ability to resume conversion within microseconds. This feature is critical for battery-powered AD7880BQ applications like handheld meters and remote sensors.
Can the AD7880BQ interface directly with a TMS320C25 DSP?
Yes, the AD7880BQ interfaces directly with the TMS320C25 DSP as documented in Figure 17 of the datasheet. Conversion is triggered by an external timer driving CONVST, and completion is signaled via BUSY → INTn. Since the TMS320C25 lacks a dedicated RD pin, the AD7880BQ's RD signal is synthesized from STRB and R/W using OR logic, with MSC providing one WAIT state for correct timing alignment.
What package type is used for the AD7880BQ and how does it differ from the AD7880BN?
The AD7880BQ uses a 24-lead Cerdip (Q-24) package - a ceramic dual-in-line package offering hermetic sealing and enhanced thermal/mechanical stability for industrial environments. In contrast, the AD7880BN uses a plastic DIP (N-24). Both share identical pinout, electrical specifications, and temperature range (–40°C to +85°C), but AD7880BQ provides superior moisture resistance and long-term reliability in harsh conditions.
AD7880BQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 66k
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- Parallel
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-CDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7880BQ FAQ
1.How can I place an order for AD7880BQ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7880BQ 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 AD7880BQ reliable?
The price and inventory of AD7880BQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7880BQ is usually 5 days.
3.What payment methods are accepted for AD7880BQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7880BQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7880BQ?
AD7880BQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7880BQ 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 AD7880BQ?
For technical support, including AD7880BQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7880BQ requirements.
6.How does Aetrix verify that AD7880BQ is sourced from the original manufacturer or authorized distributors?
All AD7880BQ 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 AD7880BQ meets industry standards.
7.What is the process for return or replacement of AD7880BQ?
All AD7880BQ units undergo pre-shipment inspection (PSI). If there is an issue with AD7880BQ, 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 AD7880BQ part is unused and in its original packaging.
Return procedure for AD7880BQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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