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Analog Devices Inc. AD7880BRZ
- Part No.:
- AD7880BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7880BRZ.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,738
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Product details
Overview
AD7880BRZ 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, 70 dB SNR, and support for unipolar (0 V to 5 V / 0 V to 10 V) and bipolar (±5 V) input ranges. It serves as a high-speed sampling front-end in portable data acquisition and real-time DSP systems.
For engineers reviewing the AD7880BRZ datasheet, AD7880BRZ pinout, AD7880BRZ application, or AD7880BRZ equivalent, key selection considerations include its LC2MOS process-based low-power operation (2 mW in power-save mode), 66 kHz throughput rate, 24-lead SOIC package compatibility, and direct microprocessor/DSP interface via CS/CONVST/RD control logic.
Technical Context
The AD7880BRZ integrates a charge-balanced comparator enabling inherent track-and-hold functionality, a 12-bit voltage-output DAC, and TTL/CMOS-compatible digital interface logic. Its conversion cycle initiates on the rising edge of CONVST and completes in ≤12 µs using a 2.5 MHz external clock, with BUSY signaling active-low status during conversion.
It employs an internal resistor network to configure analog input ranges without external components-selecting 0 V to VREF, 0 V to 2×VREF, or ±VREF by connecting VINA/VINB/AGND/VREF per Figures 5–7. Reference input is typically tied to VDD (5 V), supporting operation down to 2.5 V with SNR degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit straight binary output; enables 4096 discrete levels for precision signal digitization. |
| Conversion Time | 12 µs max at 2.5 MHz CLKIN; defines minimum inter-sample interval for ≥66 kHz sustained sampling. |
| Track/Hold Acquisition | 3 µs max; ensures full 12-bit settling for dynamic signals before conversion starts. |
| SNR | 70 dB min (1 kHz sine, 66 kHz fs); supports >11.5 effective bits up to 12 kHz input frequency. |
| Power Dissipation | 25 mW typ in normal mode; 2 mW typ in power-save mode (MODE = 0 V); critical for battery-powered portables. |
| Analog Input Ranges | 0 V to 5 V, 0 V to 10 V, or ±5 V-all selectable with single +5 V supply and no external resistors. |
| DC Accuracy | ±1 LSB INL/DNL; monotonic; full-scale error ≤±15 LSB (B-grade), enabling calibrated measurement systems. |
Pinout & Package
AD7880BRZ is housed in a 24-lead Small Outline Integrated Circuit (SOIC) package with standard 0.3-inch width and 0.050-inch lead pitch, RoHS-compliant and suitable for automated PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA | Analog input A | Main signal input; configuration with VINB/AGND/VREF sets unipolar/bipolar range per datasheet Figures 5–7. |
| VINB | Analog input B | Reference node for input attenuation network; determines polarity and scaling of VINA path. |
| AGND | Analog ground | Separate ground return for analog circuitry; must be isolated from DGND to minimize noise coupling. |
| VREF | Reference voltage input | Nominally tied to VDD (5 V); sets full-scale range; tolerates 2.5 V–5 V but degrades SNR below 5 V. |
| 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; places track/hold into hold mode and initiates conversion asynchronously. |
| RD | Read strobe | Active-low control; latches conversion result onto DB0–DB11 when CS is also low. |
| BUSY | Status output | Active-low open-drain signal; indicates conversion in progress; used for interrupt or polling synchronization. |
| CLKIN | External clock input | TTL/CMOS-compatible; 2.5 MHz nominal; mark/space ratio 40/60 to 60/40; drives SAR logic and timing. |
| DGND | Digital ground | Dedicated ground for logic I/O; requires star-point connection to AGND at single point. |
| DB0–DB11 | Data bus outputs | Three-state, parallel 12-bit output; driven only when CS and RD are both low; 57 ns access time. |
| MODE | Power mode control | High = normal operation (25 mW); low = power-save mode (2 mW); enables rapid wake-up in portable systems. |
| VDD | Supply voltage | +5 V ±5%; powers analog and digital sections; supplies VREF when tied directly. |
Key Features
| Feature | Design Value |
|---|---|
| LC2MOS fabrication process | Combines precision bipolar analog circuitry with low-power CMOS logic, enabling high DC accuracy and low standby current. |
| Multiple input range selection | Hardware-configurable 0 V–5 V, 0 V–10 V, or ±5 V ranges using only VINA/VINB/VREF/AGND connections-no external components required. |
| Fast bus interface | 57 ns data access time and 70 ns bus relinquish time allow direct connection to 16-bit microprocessors (e.g., MC68000) and DSPs (e.g., ADSP-2100) without wait states. |
| Integrated track/hold amplifier | 3 µs acquisition time eliminates need for external track/hold IC, reducing board space and signal path complexity in high-speed sampling systems. |
| Power-save mode | Reduces IDD to 750 µA (2 mW) with MODE = 0 V; recovery time <1 µs-ideal for duty-cycled portable instrumentation. |
Applications
| Portable Data Loggers | DSP-Based Audio Processing |
|---|---|
Use Scenario: Battery-powered environmental sensor nodes acquiring temperature, pressure, and humidity at 10–50 kS/s. IC Role / Device Role / Timing Role: Primary sampling ADC front-end; digitizes conditioned analog sensor outputs with minimal power overhead. Use Value: 2 mW power-save mode extends battery life; 12-bit resolution and 70 dB SNR preserve signal fidelity across multi-decade dynamic range. | Use Scenario: Real-time audio preprocessing in voice recognition hardware, capturing microphone signals at 66 kHz. IC Role / Device Role / Timing Role: High-throughput analog input stage feeding ADSP-2100 or TMS320C25; synchronized via CONVST/BUSY handshake. Use Value: 12 µs conversion + 3 µs acquisition enables full 12-bit settling at Nyquist rates; THD ≤–80 dB minimizes harmonic distortion in spectral analysis. |
| Industrial Motor Control Feedback | High-Speed Modem Analog Front-End |
Use Scenario: Closed-loop servo drives monitoring phase currents and rotor position in brushless DC motor systems. IC Role / Device Role / Timing Role: Simultaneous dual-channel sampling (via multiplexed VINA/VINB) for current sensing and encoder interpolation. Use Value: Bipolar ±5 V input range accommodates bidirectional current measurements; 66 kHz throughput supports PWM switching harmonics up to 33 kHz. | Use Scenario: Analog signal conditioning in V.34/V.90 modems digitizing line signals up to 4 kHz bandwidth with oversampling. IC Role / Device Role / Timing Role: Precision ADC in receive path; interfaces directly to TI TMS32010 via RD/CS/CONVST timing. Use Value: 70 dB SNR and –80 dB IMD ensure clean FFT bins for QAM constellation decoding; 24-pin SOIC eases layout in space-constrained modem PCBs. |
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 |
|---|---|---|---|
| AD7888ARZ | Successor device with same 24-pin SOIC package; adds internal reference (2.5 V), SPI interface, and improved SNR (72 dB). | Eliminates need for external VREF tie to VDD; simplifies design where SPI is preferred over parallel bus. | Select AD7888ARZ if system uses SPI, requires integrated reference, or needs marginally better dynamic performance. |
| MAX195BCNG+ | 16-bit, serial-output ADC; 100 kSPS; ±5 V input; requires external reference and clock; different pinout and interface protocol. | Higher resolution for precision instrumentation; serial interface reduces PCB trace count but increases firmware overhead. | Select MAX195BCNG+ only when 16-bit resolution is mandatory and SPI/I²C interface is acceptable. |
Compared with AD7880BRZ, AD7888ARZ offers enhanced integration and slightly better SNR in the same footprint, while MAX195BCNG+ trades parallel simplicity for higher resolution and serial flexibility-neither is pin-compatible, requiring layout and firmware changes.
Availability
AD7880BRZ is available at Aetrix Electronics and suitable for portable instrumentation, DSP-based audio processing, industrial motor control feedback, and high-speed modem analog front-end applications requiring stable component supply and long-term lifecycle support.
Supply support for AD7880BRZ 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, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7880BRZ belongs to Analog Devices' legacy LC2MOS precision ADC product line, designed specifically for low-power, high-speed data acquisition in battery-operated and real-time embedded systems where single-supply operation and flexible input ranging are essential.
FAQ
What is the maximum sampling rate supported by the AD7880BRZ?
The AD7880BRZ supports a maximum throughput rate of 66 kHz, achieved with a 2.5 MHz CLKIN and 15 µs total throughput time (12 µs conversion + 3 µs track/hold acquisition). This allows full-power signal conversion up to 33 kHz under Nyquist criteria. The part remains functional at lower clock frequencies, though linearity may degrade slightly below 2.5 MHz due to hold capacitor leakage.
Does the AD7880BRZ require an external reference voltage?
No-the AD7880BRZ is specified for optimal performance when VREF is tied directly to VDD (+5 V), eliminating the need for an external reference. It can operate with VREF as low as 2.5 V, but SNR degrades progressively below 5 V (e.g., ~62 dB at 2.5 V per Figure 3). No external reference IC or resistor network is required for standard unipolar or bipolar input configurations.
How does the MODE pin affect power consumption in the AD7880BRZ?
The MODE pin controls power state: when pulled high to VDD, the AD7880BRZ operates in normal mode (25 mW typical); when pulled low to 0 V, it enters power-save mode (2 mW typical). Power-save mode retains all register states and enables wake-up in <1 µs upon MODE transition, making it ideal for duty-cycled portable systems where conversion occurs intermittently.
Can the AD7880BRZ interface directly with a microcontroller without glue logic?
Yes-the AD7880BRZ features TTL/CMOS-compatible control inputs (CS, CONVST, RD) and three-state data outputs (DB0–DB11), enabling direct connection to 8/16-bit microcontrollers such as the MC68000 or 8086. Timing diagrams in the datasheet confirm compatibility with standard read/write strobes; no level shifters or bus transceivers are needed when VDD = 5 V and logic thresholds match.
What analog input configurations does the AD7880BRZ support, and how are they selected?
The AD7880BRZ supports three hardware-configured input ranges: 0 V to 5 V, 0 V to 10 V, and ±5 V-all using only VINA, VINB, VREF, and AGND connections per datasheet Figures 5–7. Selection is made by wiring: for 0 V–5 V, connect VINA to signal, VINB to VIN, VREF to VDD; for ±5 V, connect VINA to signal, VINB to VREF, VREF to VDD. No external resistors or switches are required.
AD7880BRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 66k
- Number of Inputs:
- 2
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Supply
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7880BRZ FAQ
1.How can I place an order for AD7880BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7880BRZ 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 AD7880BRZ reliable?
The price and inventory of AD7880BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7880BRZ is usually 5 days.
3.What payment methods are accepted for AD7880BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7880BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7880BRZ?
AD7880BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7880BRZ 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 AD7880BRZ?
For technical support, including AD7880BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7880BRZ requirements.
6.How does Aetrix verify that AD7880BRZ is sourced from the original manufacturer or authorized distributors?
All AD7880BRZ 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 AD7880BRZ meets industry standards.
7.What is the process for return or replacement of AD7880BRZ?
All AD7880BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7880BRZ, 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 AD7880BRZ part is unused and in its original packaging.
Return procedure for AD7880BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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