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Analog Devices Inc. AD7880BNZ
- Part No.:
- AD7880BNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7880BNZ.pdf
- Description:
- IC ADC 12BIT SAR 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,611
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Product details
Overview
AD7880BNZ 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 three analog input ranges (0 V to +5 V, 0 V to +10 V, ±5 V) and targets battery-powered portable instrumentation and real-time DSP systems.
For engineers reviewing the AD7880BNZ datasheet, AD7880BNZ pinout, AD7880BNZ application, or AD7880BNZ equivalent, key selection criteria include unipolar/bipolar range flexibility, low-power operation (2 mW in power-save mode), fast bus access (57 ns), and compatibility with microprocessor/DSP interfaces including ADSP-2100 and TMS320C25.
Technical Context
The AD7880BNZ integrates a charge-balanced comparator-based track/hold amplifier, 12-bit DAC, SAR logic, and TTL-compatible control interface. Its LC2MOS process enables bipolar precision with CMOS power efficiency, supporting asynchronous CONVST-triggered conversion independent of CS/RD timing.
Conversion is initiated on the rising edge of CONVST, placing the track/hold into hold mode; BUSY remains low for ≤12 µs while internal logic executes 26–28 clock cycles at 2.5 MHz. Data becomes valid after RD assertion with 57 ns access time, and outputs are three-stated when CS or RD is high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with straight-binary encoding |
| Conversion Time | 12 µs max - enables full-scale signal capture at up to 33 kHz input bandwidth |
| Track/Hold Acquisition | 3 µs max - ensures accurate sampling of fast-rising transients before conversion |
| Signal-to-Noise Ratio | 70 dB min - supports high-fidelity digitization of audio and speech signals |
| Power Dissipation (Normal) | 25 mW typ at +25°C - compatible with thermally constrained embedded designs |
| Power Dissipation (Save Mode) | 2 mW typ - extends battery life in portable data loggers and handheld meters |
| Analog Input Ranges | 0 V to +5 V, 0 V to +10 V, ±5 V - selectable via external pin configuration without external op amps |
| Data Access Time | 57 ns - allows direct interfacing to 16-bit microprocessors (e.g., MC68000) without wait states |
Pinout & Package
AD7880BNZ is housed in a 24-pin plastic DIP (N-24 package), 0.3 inch wide, with through-hole mounting and industry-standard footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA | Analog Input A | Primary differential input node; configured with VINB/VREF to select 0–5 V, 0–10 V, or ±5 V range |
| VINB | Analog Input B | Secondary input used with VINA to define common-mode reference per selected range |
| AGND | Analog Ground | Separate ground return for analog circuitry; must be isolated from DGND to minimize noise coupling |
| VREF | Reference Input | Accepts 2.5 V to 5 V; tied to VDD for nominal 0–5 V range; sets full-scale voltage for all configurations |
| CS | Chip Select | Active-low enable for data bus; must be low with RD to assert DB0–DB11 outputs |
| CONVST | Convert Start | Rising-edge triggered; initiates track-to-hold transition and conversion cycle asynchronously |
| RD | Read Strobe | Active-low control that latches conversion result onto DB0–DB11 when CS is low |
| BUSY | Status Output | Active-low open-drain signal indicating active conversion; goes high when result is ready |
| CLKIN | System Clock Input | TTL/CMOS-compatible 2.5 MHz clock source; mark/space ratio 40/60 to 60/40 accepted |
| DGND | Digital Ground | Dedicated ground for logic outputs and control inputs; requires star-point connection to AGND |
| DB0–DB11 | Data Outputs | Three-state parallel outputs delivering 12-bit result; high-impedance when CS or RD is high |
| 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% main supply; powers both analog and digital sections; also serves as default VREF |
Key Features
| Feature | Design Value |
|---|---|
| Single +5 V supply operation | Eliminates need for dual ±5 V rails or charge pumps-reduces BOM count and layout complexity |
| Three user-selectable input ranges | Enables one hardware design to support multiple sensor types (e.g., 0–5 V pressure, ±5 V accelerometer) |
| On-chip track/hold amplifier | Removes requirement for external THS; acquires 12-bit signal in 3 µs without aperture jitter penalties |
| Fast 57 ns data access time | Permits glueless interface to high-speed microprocessors (e.g., 8086, MC68000) without added wait-state logic |
| Power-save mode (2 mW) | Extends operational runtime in battery-powered applications such as portable spectrum analyzers and field data recorders |
| LC2MOS fabrication process | Combines bipolar precision (70 dB SNR) with CMOS logic density and low quiescent current |
Applications
| Battery-Powered Portable Instrumentation | Digital Signal Processing Front-End |
|---|---|
Use Scenario: Handheld multimeter acquiring DC voltage, AC RMS, and temperature readings with auto-ranging. IC Role / Device Role / Timing Role: Primary ADC capturing conditioned analog sensor outputs at variable rates up to 66 kSPS. Use Value: Single-supply operation and 2 mW power-save mode enable >100-hour battery life; 3 µs acquisition handles fast step responses during range switching. |
Use Scenario: Real-time audio preprocessing stage feeding an ADSP-2100 for voice recognition in industrial HMI. IC Role / Device Role / Timing Role: High-fidelity analog front-end converting microphone preamp output with minimal harmonic distortion. Use Value: 70 dB SNR and –80 dB THD preserve speech spectral integrity; 57 ns bus access synchronizes cleanly with DSP DMA cycles. |
| High-Speed Modem Analog Interface | Industrial Control & Data Acquisition |
Use Scenario: Fax/data modem digitizing analog line signals for echo cancellation and equalization algorithms. IC Role / Device Role / Timing Role: Precision sampling engine handling baseband signals up to 33 kHz with low intermodulation distortion. Use Value: –80 dB IMD (second/third order) prevents spectral contamination in dual-tone test conditions; ±5 V range accommodates line-level swing. |
Use Scenario: PLC I/O module measuring 4–20 mA current loops and thermocouple outputs across multiple channels. IC Role / Device Role / Timing Role: Configurable-range ADC enabling shared PCB design for different sensor types without component changes. Use Value: 0–10 V and ±5 V input options allow direct connection to industrial transmitters; 12 LSB INL ensures calibration stability over –40°C to +85°C. |
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 |
|---|---|---|---|
| AD7890ARZ-10 | 12-bit, 100 kSPS, serial SPI interface, no on-chip track/hold, requires external REF | Targets space-constrained designs needing serial interface; lacks 3 µs acquisition and multi-range flexibility | Select when board area is critical and system clocking supports SPI; avoid if analog input range agility or low-latency parallel read is required |
| MAX1113ECPP | 12-bit, 100 kSPS, +3 V/+5 V dual-supply, internal reference, no MODE pin for power save | Optimized for low-voltage portable systems; lacks ±5 V bipolar range and 2 mW ultra-low-power mode | Prefer for 3.3 V–dominant systems with fixed 0–VREF unipolar inputs; not suitable for legacy +5 V industrial designs requiring bipolar support |
Compared with AD7880BNZ, AD7890ARZ-10 offers higher throughput but sacrifices pin-compatible parallel interface and integrated track/hold, while MAX1113ECPP reduces supply flexibility and eliminates the critical 2 mW power-save state needed for extended battery operation.
Availability
AD7880BNZ is available at Aetrix Electronics and suitable for battery-powered instrumentation, digital signal processing front-ends, and industrial control systems requiring stable component supply across long production lifecycles.
Supply support for AD7880BNZ 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 AD7880BNZ belongs to Analog Devices' precision data acquisition product line, designed specifically for applications demanding single-supply simplicity, multi-range analog flexibility, and low-power operation in harsh environments.
FAQ
What input voltage ranges does the AD7880BNZ support?
The AD7880BNZ supports three user-configurable analog input ranges: 0 V to +5 V, 0 V to +10 V, and ±5 V. These are selected by external connections between VINA, VINB, and VREF as defined in Figures 5–7 of the datasheet. No external components are required to switch between ranges, and all operate from the same +5 V supply. The AD7880BNZ achieves this using an internal resistor network and charge-balanced comparator architecture.
How does the power-save mode function on the AD7880BNZ?
The AD7880BNZ enters power-save mode when the MODE pin is driven to 0 V (logic low), reducing typical power dissipation from 25 mW to 2 mW. In this state, internal bias currents are minimized while retaining full functionality-conversion can be reinitiated immediately via CONVST without wake-up delay. This feature is explicitly verified for the AD7880BNZ across its full –40°C to +85°C operating range.
Is the AD7880BNZ pin-compatible with other devices in the AD78xx family?
No-the AD7880BNZ has a unique 24-pin DIP pinout optimized for its specific control interface (CONVST, BUSY, MODE) and dual-ground architecture (AGND/DGND). Devices like AD7870 or AD7874 use different pin counts, signal assignments, and timing protocols. Substitution requires PCB redesign and firmware adaptation; the AD7880BNZ must be treated as a standalone solution.
What is the maximum recommended clock frequency for the AD7880BNZ CLKIN input?
The AD7880BNZ is specified and production-tested for reliable operation at 2.5 MHz CLKIN. While functional at lower frequencies, performance degrades above 2.5 MHz: linearity error increases due to internal timing margins, and the 12 µs conversion time guarantee no longer applies. The datasheet explicitly defines 2.5 MHz as the maximum rated clock frequency for guaranteed specifications-including 70 dB SNR and ±1 LSB INL.
Does the AD7880BNZ require external calibration for offset and full-scale accuracy?
The AD7880BNZ specifies ±15 LSB full-scale error and ±10 LSB bipolar zero error (B-grade), which may require trimming in metrology-grade applications. Figure 11 in the datasheet provides a validated external op-amp and potentiometer circuit for adjusting both offset and full-scale errors. However, many industrial control and DSP applications tolerate these errors or correct them digitally-no factory calibration is shipped with the AD7880BNZ.
AD7880BNZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7880BNZ FAQ
1.How can I place an order for AD7880BNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7880BNZ 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 AD7880BNZ reliable?
The price and inventory of AD7880BNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7880BNZ is usually 5 days.
3.What payment methods are accepted for AD7880BNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7880BNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7880BNZ?
AD7880BNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7880BNZ 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 AD7880BNZ?
For technical support, including AD7880BNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7880BNZ requirements.
6.How does Aetrix verify that AD7880BNZ is sourced from the original manufacturer or authorized distributors?
All AD7880BNZ 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 AD7880BNZ meets industry standards.
7.What is the process for return or replacement of AD7880BNZ?
All AD7880BNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7880BNZ, 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 AD7880BNZ part is unused and in its original packaging.
Return procedure for AD7880BNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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