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Analog Devices Inc. AD7880CQ
- Part No.:
- AD7880CQ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-CDIP (0.300", 7.62mm)
- Datasheet:
-
AD7880CQ.pdf
- Description:
- IC ADC 12BIT MONO LP 24-CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:660
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Product details
Overview
AD7880CQ from Analog Devices is a 12-bit monolithic successive-approximation ADC with LC2MOS process technology, operating from a single +5 V supply. It delivers 66 kHz throughput, 12 µs conversion time, and 3 µs track/hold acquisition, supporting unipolar (0 V to 5 V / 0 V to 10 V) and bipolar (±5 V) input ranges. It is used in battery-powered portable instrumentation requiring low power and high-speed sampling.
For engineers reviewing the AD7880CQ datasheet, AD7880CQ pinout, AD7880CQ application, or AD7880CQ equivalent, key selection factors include its ±5 LSB full-scale error (C grade), 70 dB SNR at 1 kHz, 57 ns data access time, and compatibility with microprocessor interfaces including ADSP-2100, TMS320C25, and MC68000.
Technical Context
The AD7880CQ integrates a charge-balanced comparator-based track/hold amplifier, 12-bit DAC, and SAR logic - enabling inherent track-and-hold functionality without external components. Its conversion cycle requires 26–28 clock periods at 2.5 MHz CLKIN, with BUSY output signaling completion asynchronously to CONVST.
It supports three user-configurable analog input ranges via internal resistor network: 0 V to VREF, 0 V to 2×VREF, and ±VREF - all achievable with VREF = VDD = +5 V. Logic interface uses TTL-compatible inputs (CS, CONVST, RD) and three-state CMOS outputs (DB0–DB11), with MODE pin controlling power save mode (2.5 mW typical).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete digital codes for precise amplitude quantization. |
| Throughput Rate | 66 kHz - enables real-time sampling of signals up to 33 kHz per Nyquist criterion. |
| Conversion Time | 12 µs max - defines minimum inter-conversion interval for high-speed sequencing. |
| Track/Hold Acquisition | 3 µs max - ensures full 12-bit settling before conversion starts, critical for wideband inputs. |
| Signal-to-Noise Ratio | 70 dB min - guarantees ≥11.5 effective number of bits (ENOB) for clean spectral analysis. |
| Power Dissipation (Normal) | 25 mW typ at +25°C - compatible with thermally constrained portable designs. |
| Power Dissipation (Save Mode) | 2 mW typ - extends battery life during idle intervals without losing configuration state. |
| Data Access Time | 57 ns - allows direct interfacing to fast microprocessors (e.g., ADSP-2100, TMS320C25) without wait states. |
Pinout & Package
AD7880CQ is housed in a 24-lead Cerdip (Q-24) package - hermetically sealed, ceramic dual-in-line with 0.3-inch width, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA / VINB | Differential analog input pair | Configurable for unipolar (0–5 V, 0–10 V) or bipolar (±5 V) ranges using internal resistor network. |
| AGND / DGND | Analog and digital ground references | Separate ground pins minimize noise coupling between analog signal path and digital switching. |
| VREF | Reference voltage input | Accepts 2.5 V to 5 V; tied to VDD for nominal 0–5 V range; sets full-scale quantization step (1.22 mV LSB). |
| CONVST | Asynchronous conversion start | Rising edge initiates track→hold transition and conversion; independent of CS/RD timing. |
| CS / RD | Chip select and read strobe | Active-low control pair enables three-state data bus output only when both are low. |
| BUSY | Status output | Active-low open-drain signal indicates ongoing conversion; used for interrupt-driven or polling read sequences. |
| DB0–DB11 | Parallel 12-bit data outputs | Three-state CMOS outputs deliver straight-binary result; compatible with 5 V TTL/CMOS logic families. |
| MODE | Power mode control | Logic high (VDD) enables normal operation; logic low (0 V) activates 2 mW power-save mode. |
| CLKIN | External clock input | Accepts 2.5 MHz TTL/CMOS clock; mark/space ratio 40/60 to 60/40; determines conversion timing precision. |
Key Features
| Feature | Design Value |
|---|---|
| Single +5 V supply operation | Eliminates need for dual ±5 V rails or charge pumps - simplifies power design in portable systems. |
| Multiple input range support | Hardware-selectable 0–5 V, 0–10 V, and ±5 V ranges via VINA/VINB connections - no external op amps required. |
| Integrated track/hold amplifier | 3 µs acquisition time with inherent charge-balancing architecture - avoids external THA component and layout complexity. |
| TTL/CMOS-compatible interface | Standard control inputs (CS, CONVST, RD) and three-state outputs enable plug-in replacement in existing 16-bit MPU/DSP designs. |
| LC2MOS process technology | Combines precision bipolar front-end with low-power CMOS logic - achieves 70 dB SNR and 2 mW standby simultaneously. |
Applications
| Portable Data Acquisition | DSP-Based Signal Processing |
|---|---|
Use Scenario: Handheld multimeter or field sensor node acquiring voltage, temperature, or vibration signals under battery power. IC Role / Device Role / Timing Role: Primary sampling engine performing synchronized 12-bit digitization at up to 66 kHz with minimal power overhead. Use Value: 2 mW power-save mode extends runtime; 3 µs track/hold captures transient events; 0–10 V range accommodates industrial transducer outputs directly. | Use Scenario: Real-time audio or sonar preprocessing stage feeding ADSP-2100 or TMS320C25 for FFT or filtering. IC Role / Device Role / Timing Role: High-speed analog front-end providing low-latency, deterministic sample delivery to DSP memory-mapped I/O. Use Value: 57 ns data access time eliminates wait states; BUSY-interrupt handshake ensures precise sample alignment with algorithm execution. |
| High-Speed Modem Front-End | Industrial Control Loop Sampling |
Use Scenario: Analog baseband section of V.34 modem converting filtered line signals prior to digital equalization. IC Role / Device Role / Timing Role: Precision ADC capturing 0–5 V or ±5 V baseband waveforms with <±5 LSB full-scale error (C grade) and 70 dB SNR. Use Value: Low harmonic distortion (–80 dB THD) preserves signal integrity; single-supply operation reduces board space vs. legacy ±15 V solutions. | Use Scenario: Closed-loop motor controller monitoring current/voltage feedback in PLC or servo drive with thermal constraints. IC Role / Device Role / Timing Role: Isolated analog input conditioner digitizing ±5 V isolated sensor outputs at 33 kHz sustained rate. Use Value: Bipolar input support eliminates level-shifting circuitry; 24-pin DIP/SOIC footprint allows drop-in upgrade from AD7870/AD7874. |
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 |
|---|---|---|---|
| AD7874BN | 12-bit, 100 kHz throughput, 8 µs conversion, but requires ±12 V analog supply and +5 V digital supply. | Not suitable for single-supply portable systems; higher power (120 mW), larger SOIC-28 package. | Select AD7874BN only if higher speed and dual-supply infrastructure already exist. |
| ADS7822U | 12-bit, 200 kSPS, SPI interface, +2.7 V to +5.5 V supply, but only unipolar 0–VREF input and no built-in track/hold. | Requires external THA and reference buffer; lacks bipolar range and parallel bus interface. | Choose ADS7822U for space-constrained, low-voltage, serial-interface designs where system-level THA is acceptable. |
Compared with AD7874BN and ADS7822U, the AD7880CQ uniquely combines single +5 V operation, integrated track/hold, bipolar input capability, and parallel microprocessor interface - making it optimal for retrofitting legacy 16-bit MPU systems while maintaining low power and wide dynamic range.
Availability
AD7880CQ is available at Aetrix Electronics and suitable for portable instrumentation, DSP front-ends, and industrial control systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7880CQ 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, founded in 1965 and headquartered in Wilmington, MA.
The AD7880 belongs to Analog Devices' precision data acquisition IC product line, designed specifically for high-speed, low-power, single-supply sampling applications in portable test equipment, communications infrastructure, and real-time control systems.
FAQ
What is the maximum sampling frequency supported by the AD7880CQ?
The AD7880CQ supports a maximum throughput rate of 66 kHz, corresponding to a minimum conversion period of 15 µs (12 µs conversion + 3 µs track/hold acquisition). This allows full-power signal sampling up to 33 kHz per the Nyquist–Shannon theorem. Performance remains specified at this rate with 70 dB SNR and –80 dB THD when driven by a 2.5 MHz CLKIN and operated within its –40°C to +85°C temperature range.
Does the AD7880CQ require an external track-and-hold amplifier?
No, the AD7880CQ does not require an external track-and-hold amplifier. Its charge-balanced comparator architecture provides an inherent track/hold function with guaranteed 3 µs acquisition time to 12-bit accuracy. This eliminates external components, PCB area, and matching errors - a key differentiator versus earlier-generation ADCs like the AD7874 that mandate external THA circuits.
How does the AD7880CQ achieve bipolar (±5 V) input operation from a single +5 V supply?
The AD7880CQ achieves ±5 V bipolar input operation using an internal resistor network that configures VINA and VINB relative to VREF = VDD = +5 V. As shown in Figure 7 of the datasheet, connecting VINB to VREF and VINA to the signal source establishes the ±VREF range. The on-chip DAC and comparator topology allow signed-digit encoding without external level-shifting, delivering straight-binary output where 0x800 represents 0 V and full scale spans –5 V to +5 V.
What is the significance of the MODE pin on the AD7880CQ?
The MODE pin on the AD7880CQ controls power state: logic high (VDD) enables normal operation (25 mW typical), while logic low (0 V) activates power-save mode (2 mW typical). Unlike shutdown modes that reset internal state, the AD7880CQ retains configuration and reference bias in save mode - allowing rapid wake-up (<1 µs) without recalibration. This feature is essential for duty-cycled portable instruments where conversion occurs intermittently.
Can the AD7880CQ interface directly with the TMS320C25 DSP?
Yes, the AD7880CQ can interface directly with the TMS320C25 DSP, as confirmed in Analog Devices Application Note AN-282 and Figure 17 of the AD7880 datasheet. The interface uses CONVST triggered by an external timer, BUSY-to-INTn interrupt signaling, and RD generation from STRB/R/W logic. The AD7880CQ's 57 ns data access time and three-state DB0–DB11 outputs align with the C25's memory-read timing, enabling reliable IN D,ADC instruction execution without added wait states.
AD7880CQ 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:
- -
AD7880CQ FAQ
1.How can I place an order for AD7880CQ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7880CQ 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 AD7880CQ reliable?
The price and inventory of AD7880CQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7880CQ is usually 5 days.
3.What payment methods are accepted for AD7880CQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7880CQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7880CQ?
AD7880CQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7880CQ 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 AD7880CQ?
For technical support, including AD7880CQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7880CQ requirements.
6.How does Aetrix verify that AD7880CQ is sourced from the original manufacturer or authorized distributors?
All AD7880CQ 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 AD7880CQ meets industry standards.
7.What is the process for return or replacement of AD7880CQ?
All AD7880CQ units undergo pre-shipment inspection (PSI). If there is an issue with AD7880CQ, 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 AD7880CQ part is unused and in its original packaging.
Return procedure for AD7880CQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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