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Analog Devices Inc. AD7880CN
- Part No.:
- AD7880CN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7880CN.pdf
- Description:
- IC ADC 12BIT MONO LP 24-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,636
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Product details
Overview
AD7880CN from Analog Devices is a 12-bit monolithic successive-approximation ADC operating from a single +5 V supply, featuring 66 kHz throughput rate, 12 µs conversion time, and 3 µs track/hold acquisition. It supports unipolar (0 V to +5 V, 0 V to +10 V) and bipolar (±5 V) input ranges using internal resistor networks, and is used in battery-powered portable instrumentation and DSP-based signal acquisition systems.
For engineers reviewing the AD7880CN datasheet, AD7880CN pinout, AD7880CN application, or AD7880CN equivalent, key selection considerations include its LC2MOS process, 70 dB SNR at 1 kHz, power-save mode (2 mW typ), fast 57 ns data access, and compatibility with microprocessor interfaces including ADSP-2100 and TMS320C25.
Technical Context
The AD7880CN integrates a charge-balanced comparator enabling inherent track/hold functionality, a 12-bit voltage-output DAC, and SAR logic synchronized to an external 2.5 MHz TTL-compatible CLKIN. Its conversion cycle initiates on the rising edge of CONVST and completes in ≤12 µs across 26–28 clock periods.
It uses a single +5 V supply with VREF typically tied to VDD, supporting three user-configurable analog input ranges via VINA/VINB routing. Digital interface employs standard active-low CS and RD with three-state DB0–DB11 outputs and BUSY status signaling - all compliant with industrial temperature range (–40°C to +85°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity digitization of analog signals. |
| Throughput Rate | 66 kHz - enables full-power sampling of up to 33 kHz sinusoidal inputs without aliasing. |
| SNR | 70 dB min (1 kHz input, 66 kHz sampling) - ensures clean spectral representation for speech and modem applications. |
| Conversion Time | 12 µs max - deterministic latency critical for real-time control loops and synchronized acquisition. |
| Track/Hold Acquisition | 3 µs max - captures 12-bit accurate samples of fast-changing inputs before conversion begins. |
| Power Dissipation (Normal) | 25 mW typ at +25°C - low thermal load suitable for compact, convection-cooled designs. |
| Power Dissipation (Power Save) | 2 mW typ at +25°C - extends battery life in handheld test equipment and portable sensors. |
| Analog Input Ranges | 0 V to +5 V, 0 V to +10 V, ±5 V - selectable via external pin connections, no external op amps required. |
Pinout & Package
AD7880CN is housed in a 24-pin plastic dual-in-line package (N-24), 0.3 inch wide, with through-hole mounting and industry-standard DIP footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA | Analog Input A | Primary analog signal input; configured with VINB and VREF to select 0–5 V, 0–10 V, or ±5 V range. |
| VINB | Analog Input B | Secondary analog reference node; determines polarity and scaling when paired with VINA and VREF. |
| AGND | Analog Ground | Separate ground return for analog circuitry to minimize noise coupling into sensitive sampling path. |
| VREF | Reference Input | Accepts 2.5 V to 5 V reference; typically tied to VDD to enable all three input ranges from single supply. |
| CS | Chip Select | Active-low enable for data bus; must be low with RD low to assert DB0–DB11 outputs. |
| CONVST | Convert Start | Rising-edge-triggered asynchronous command that initiates track-to-hold transition and conversion sequence. |
| RD | Read Strobe | Active-low control that latches conversion result onto DB0–DB11 when CS is also low. |
| BUSY | Status Output | Active-low open-drain signal indicating ongoing conversion; goes high when result is ready. |
| CLKIN | Master Clock Input | TTL/CMOS-compatible 2.5 MHz clock source; mark/space ratio 40/60 to 60/40 accepted. |
| DGND | Digital Ground | Isolated ground return for digital I/O to prevent switching noise from corrupting analog accuracy. |
| DB0–DB11 | Data Outputs | Three-state parallel 12-bit output bus; driven only when CS and RD are both low. |
| MODE | Power Mode Control | Logic-high (VDD) enables normal operation; logic-low (0 V) activates 2 mW power-save mode. |
| VDD | Supply Voltage | +5 V ±5% single supply powering both analog and digital sections; powers internal reference and logic. |
Key Features
| Feature | Design Value |
|---|---|
| LC2MOS Process Integration | Combines precision bipolar analog front-end with low-power CMOS logic - enabling single-supply 12-bit performance without external support components. |
| Configurable Input Ranges | Hardware-selectable 0–5 V, 0–10 V, and ±5 V ranges via VINA/VINB/VREF interconnection - eliminates need for external gain/level-shift circuitry. |
| Fast Bus Interface | 57 ns data access time and 5 ns bus relinquish time - directly compatible with ADSP-2100, TMS320C25, and MC68000 without wait states. |
| Low-Power Power-Save Mode | 750 µA IDD and 2 mW dissipation at +25°C - reduces system-level power budget during idle intervals in portable instruments. |
| Guaranteed Monotonicity | Differential nonlinearity ≤ ±1 LSB across full temperature range - ensures no code misses in closed-loop feedback or servo applications. |
| Dynamic Performance Specification | 70 dB SNR, –80 dB THD, and –80 dB IMD measured at 1 kHz and 66 kHz sampling - validated for audio, sonar, and telecom signal chains. |
Applications
| Battery-Powered Portable Instrumentation | Digital Signal Processing Front-End |
|---|---|
Use Scenario: Handheld multimeter or field-deployable sensor node acquiring analog voltage/current with limited battery capacity. IC Role / Device Role / Timing Role: Primary 12-bit digitizer capturing conditioned sensor outputs at up to 66 kSPS while maintaining <2 mW standby draw. Use Value: Enables >24-hour operation on AA batteries by leveraging power-save mode between measurements and eliminating external level-shifting components. |
Use Scenario: Real-time spectrum analyzer or adaptive filter platform processing audio or vibration signals. IC Role / Device Role / Timing Role: High-fidelity analog front-end feeding ADSP-2100 or TMS320C25 with synchronized 12-bit samples at 66 kHz. Use Value: 70 dB SNR and –80 dB THD preserve signal integrity for FFT-based analysis; 57 ns access time avoids processor wait states. |
| Speech Recognition System | High-Speed Modem Analog Interface |
Use Scenario: Embedded voice-command module in industrial HMI requiring low-latency analog capture of microphone signals. IC Role / Device Role / Timing Role: Low-noise, low-power ADC converting pre-amplified audio band (20 Hz–4 kHz) with minimal group delay. Use Value: 3 µs track/hold acquisition and 12 µs conversion ensure accurate sampling of transient phonemes; 70 dB SNR supports robust feature extraction. |
Use Scenario: Fax/data modem board digitizing analog line signals for demodulation in telecommunication infrastructure. IC Role / Device Role / Timing Role: Precision sampling engine meeting ITU-T V.22/V.32 linearity and distortion requirements at 66 kHz. Use Value: ±1 LSB INL/DNL and –80 dB IMD meet stringent spectral purity demands; ±5 V bipolar range accommodates AC-coupled line signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7888BRZ | 12-bit, 100 kSPS, SPI interface, internal reference, SOIC-24 package; requires serial interface redesign. | Best for space-constrained PCBs needing lower pin count and integrated reference; not pin-compatible. | Select when migrating to serial interface and accepting layout change; verify timing alignment with host controller. |
| MAX195BCNG+ | 16-bit, 100 kSPS, parallel interface, ±5 V supply, 85 dB SNR; higher resolution but dual-supply (+5 V/–5 V) required. | Suitable for high-dynamic-range measurement where 12-bit quantization noise is limiting; incompatible with single +5 V systems. | Choose only if 4-bit ENOB improvement justifies dual-supply complexity and cost increase; not drop-in. |
Compared with AD7880CN, AD7888BRZ offers faster throughput and serial simplicity but sacrifices parallel bus compatibility, while MAX195BCNG+ delivers superior resolution and SNR at the cost of supply flexibility and pinout compatibility - neither is pin- or software-compatible without hardware and firmware revision.
Availability
AD7880CN is available at Aetrix Electronics and suitable for battery-powered instrumentation, digital signal processing front-ends, and speech recognition systems requiring stable component supply across extended production lifecycles.
Supply support for AD7880CN 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 AD7880CN belongs to Analog Devices' LC2MOS precision ADC product line, designed specifically for single-supply, low-power, high-speed data acquisition in portable and embedded systems where size, power, and interface simplicity are critical.
FAQ
What is the maximum sampling frequency supported by the AD7880CN?
The AD7880CN supports a maximum throughput rate of 66 kHz, corresponding to a minimum total acquisition-and-conversion time of 15 µs (3 µs track/hold + 12 µs conversion). This allows full-power sampling of input signals up to 33 kHz while satisfying the Nyquist criterion. The part is specified with a 2.5 MHz CLKIN, and performance degrades gradually below this frequency due to hold capacitor leakage.
Does the AD7880CN require external components for basic operation?
No, the AD7880CN requires only an external 2.5 MHz clock source on CLKIN and standard power supply decoupling capacitors (typically 0.1 µF ceramic near VDD and AGND/DGND pins). It contains an on-chip track/hold amplifier, 12-bit DAC, comparator, SAR logic, and configurable input range network - no external op amps, references, or resistors are needed for any of its three input ranges.
How does the MODE pin affect power consumption in the AD7880CN?
When MODE = 0 V, the AD7880CN enters power-save mode, reducing IDD to 750 µA max at +25°C (2.5 mW typical). When MODE = VDD (+5 V), it operates in normal mode with IDD ≤ 7.5 mA (25 mW typical). The transition is immediate and asynchronous; no setup time is required. Power-save mode disables internal clocks and analog biasing but retains pin states and register contents.
Can the AD7880CN interface directly with the ADSP-2100 DSP without glue logic?
Yes, the AD7880CN interfaces directly with the ADSP-2100 using its native parallel bus timing. The BUSY output drives an interrupt (via inverter), and CONVST is triggered by a timer - no address decoding or wait-state generation is needed. The AD7880CN's 57 ns data access time and 5 ns bus relinquish time align with ADSP-2100's memory read cycle, enabling zero-wait-state transfers using the MR0 = DM(ADC) instruction.
What are the absolute maximum ratings for analog input voltage on the AD7880CN?
For the AD7880CN, the absolute maximum analog input voltage depends on configuration: for 0 V to +5 V range (Figure 5), VINA/VINB must stay within –0.3 V to VDD + 0.3 V; for 0 V to +10 V range (Figure 6), VINA may swing to –0.6 V to 2×VDD + 0.6 V; for ±5 V range (Figure 7), VINA may reach –VDD – 0.3 V to VDD + 0.3 V. Exceeding these risks permanent damage per Absolute Maximum Ratings table.
AD7880CN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-DIP (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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7880CN FAQ
1.How can I place an order for AD7880CN through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7880CN 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 AD7880CN reliable?
The price and inventory of AD7880CN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7880CN is usually 5 days.
3.What payment methods are accepted for AD7880CN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7880CN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7880CN?
AD7880CN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7880CN 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 AD7880CN?
For technical support, including AD7880CN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7880CN requirements.
6.How does Aetrix verify that AD7880CN is sourced from the original manufacturer or authorized distributors?
All AD7880CN 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 AD7880CN meets industry standards.
7.What is the process for return or replacement of AD7880CN?
All AD7880CN units undergo pre-shipment inspection (PSI). If there is an issue with AD7880CN, 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 AD7880CN part is unused and in its original packaging.
Return procedure for AD7880CN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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