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Analog Devices Inc. AD7880BRZ-REEL
- Part No.:
- AD7880BRZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7880BRZ-REEL.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,533
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Product details
Overview
AD7880BRZ-REEL 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. It supports unipolar (0 V to 5 V, 0 V to 10 V) and bipolar (±5 V) input ranges using internal resistor networks, and targets portable instrumentation and real-time DSP systems.
For engineers reviewing the AD7880BRZ-REEL datasheet, AD7880BRZ-REEL pinout, AD7880BRZ-REEL application, or AD7880BRZ-REEL equivalent, key selection considerations include its LC2MOS process-based low-power operation (2 mW in power-save mode), 24-pin SOIC package compatibility, three-state parallel data interface, and support for microprocessor/DSP interfacing without external components beyond clock and decoupling capacitors.
Technical Context
The AD7880BRZ-REEL integrates a charge-balanced comparator that inherently provides track/hold functionality, eliminating need for external sample-and-hold circuitry. Its SAR architecture uses a fast-settling 12-bit voltage-output DAC and operates with a 2.5 MHz TTL-compatible CLKIN, supporting throughput up to 66 kHz.
Control logic accepts asynchronous CONVST rising-edge triggers and coordinates BUSY status signaling, CS/RD–gated three-state data output enablement, and MODE-driven power-save entry (MODE = 0 V). Input range selection is achieved via external pin configuration (VINA/VINB/VREF connections), not register programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes with straight-binary output format |
| Conversion Time | 12 µs max - enables full-scale signal capture within one cycle of 66 kHz sampling rate |
| Track/Hold Acquisition | 3 µs max - ensures accurate sampling of bandwidth-limited analog inputs before conversion |
| Signal-to-Noise Ratio | 70 dB min - supports high-fidelity digitization of audio and sensor signals up to ~12 kHz effective bandwidth |
| Power Dissipation (Normal) | 25 mW typ at +25°C - compatible with thermally constrained embedded designs |
| Power Dissipation (Power-Save) | 2 mW typ at +25°C - extends battery life in portable systems during idle intervals |
| Analog Input Ranges | 0 V to 5 V, 0 V to 10 V, ±5 V - selectable via external pin wiring, no external op amps required |
| Data Interface | Parallel 12-bit three-state outputs (DB0–DB11) with CS/RD control - directly interfaces to 8086, MC68000, ADSP-2100 buses |
Pinout & Package
AD7880BRZ-REEL is housed in a 24-lead Small Outline Integrated Circuit (SOIC) package, 0.3 inch wide, RoHS-compliant, with standard JEDEC MS-013AC footprint and moisture sensitivity level (MSL) 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA | Analog Input A | Primary analog signal input; used with VINB and VREF to configure unipolar/bipolar ranges per Figures 5–7 |
| VINB | Analog Input B | Reference node for input attenuator network; tied to AGND (0 V to 10 V) or VREF (±5 V) per range selection |
| AGND | Analog Ground | Separate ground return for analog circuitry; must be isolated from DGND except at single-point star ground |
| VREF | Reference Input | Accepts 2.5 V to 5 V reference; typically tied to VDD for 0 V–5 V/0 V–10 V/±5 V operation |
| 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; initiates track→hold transition and conversion sequence |
| RD | Read Strobe | Active-low control synchronized with CS; gates three-state drivers to place conversion result on data bus |
| BUSY | Status Output | Active-low open-drain indicator; remains low during conversion, 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 | Ground return for logic I/O; requires separate trace from AGND, joined only at system-level ground point |
| DB0–DB11 | Data Outputs | Three-state parallel bus; outputs valid within 57 ns after RD falling edge (t7) |
| MODE | Power Mode Control | High = normal operation (25 mW); low = power-save mode (2 mW); no sequencing required |
| VDD | +5 V Supply | Nominal +5 V ±5%; powers both analog and digital sections; decoupling capacitor required at pin |
Key Features
| Feature | Design Value |
|---|---|
| LC2MOS Process Integration | Combines precision bipolar analog front-end with low-power CMOS logic-enables single-supply 12-bit performance without laser trimming |
| Inherent Track/Hold Function | Charge-balanced comparator eliminates need for external S/H IC or op amp, reducing BOM count and layout area |
| Multiple Input Range Support | Hardware-configurable 0 V–5 V, 0 V–10 V, and ±5 V ranges using only VINA/VINB/VREF wiring-no external resistors or switches needed |
| Fast Parallel Interface | 57 ns data access time and 70 ns bus relinquish time allow direct connection to 16-bit microprocessors (8086, MC68000) and DSPs (ADSP-2100) |
| Low-Power Power-Save Mode | 750 µA IDD (1 mA max over temperature) reduces standby current by >90% versus normal mode-critical for battery-powered telemetry |
| Dynamic Performance Guarantee | 70 dB SNR, –80 dB THD, and –80 dB IMD specified at 66 kHz sampling-validated for speech, modem, and sonar signal chain applications |
Applications
| Portable Data Acquisition | DSP-Based Motor Control |
|---|---|
Use Scenario: Battery-powered handheld oscilloscope capturing transient waveforms in field service environments. IC Role / Device Role / Timing Role: Primary analog-to-digital converter acquiring 12-bit samples at up to 66 kHz with onboard track/hold. Use Value: 2 mW power-save mode extends runtime between charges; 3 µs acquisition captures fast edges without external S/H. |
Use Scenario: Real-time current/voltage sensing in industrial servo drives using ADSP-2100 for closed-loop torque regulation. IC Role / Device Role / Timing Role: High-speed ADC feeding position and phase feedback into DSP for PWM update cycles. Use Value: 12 µs conversion time aligns with 15 µs total throughput, enabling deterministic 66 kHz control loop execution. |
| Telecom Modem Front-End | Audio Signal Digitization |
Use Scenario: High-speed modem board digitizing analog line signals for echo cancellation and equalization algorithms. IC Role / Device Role / Timing Role: Precision ADC providing 70 dB SNR and –80 dB THD for clean baseband signal reconstruction. Use Value: Specified dynamic performance ensures compliance with ITU-T V.34 spectral mask requirements up to 33 kHz input bandwidth. |
Use Scenario: Voice recording module in security system capturing ambient sound for keyword detection. IC Role / Device Role / Timing Role: Low-power ADC sampling microphone output at 66 kHz with programmable gain amplifier interface. Use Value: Unipolar 0 V–5 V range matches typical electret mic preamp output swing; 25 mW normal mode supports continuous operation. |
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 |
|---|---|---|---|
| AD7888ARZ | 8-channel, serial SPI interface, 100 kSPS, 2.7–5.25 V supply; smaller 20-lead TSSOP package | Replaces parallel interface with serial; suited for space-constrained multi-sensor systems requiring channel multiplexing | Select AD7888ARZ when board area is limited and microcontroller supports SPI; AD7880BRZ-REEL preferred for legacy parallel bus compatibility |
| ADS7822U | 12-bit, 200 kSPS, SPI interface, 2.7–5.25 V, internal reference; 8-lead SOIC package | Lacks bipolar input support and hardware-configurable ranges; requires external reference for full-scale flexibility | Choose ADS7822U for cost-sensitive, single-ended unipolar applications where 200 kSPS and small footprint outweigh range versatility |
Compared with AD7880BRZ-REEL, AD7888ARZ offers higher channel density and serial interface at lower power but sacrifices parallel bus simplicity and bipolar input capability; ADS7822U delivers faster sampling and smaller size but lacks hardware-selectable input ranges and requires external reference for ±5 V operation.
Availability
AD7880BRZ-REEL is available at Aetrix Electronics and suitable for portable instrumentation, DSP-based motor control, telecom modem front-ends, and audio digitization requiring stable component supply across industrial temperature range (–40°C to +85°C).
Supply support for AD7880BRZ-REEL 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 AD7880BRZ-REEL belongs to Analog Devices' precision SAR ADC product line, designed specifically for applications demanding low-power, single-supply, hardware-configurable analog input acquisition with minimal external components.
FAQ
What is the maximum sampling frequency supported by the AD7880BRZ-REEL?
The AD7880BRZ-REEL supports a maximum sampling frequency of 66 kHz, corresponding to a minimum total throughput time of 15 µs (12 µs conversion + 3 µs track/hold acquisition). This is achievable with a 2.5 MHz CLKIN and proper timing alignment of CONVST and RD signals as defined in the timing diagram (Figure 1).
Does the AD7880BRZ-REEL require an external reference voltage?
The AD7880BRZ-REEL does not require an external reference voltage for basic operation: VREF is typically tied to VDD (+5 V), enabling all three input ranges (0 V–5 V, 0 V–10 V, ±5 V). However, it can accept an external reference from 2.5 V to 5 V; performance degrades below 2.5 V, with SNR dropping as shown in Figure 3 of the datasheet.
How is bipolar input range (±5 V) configured on the AD7880BRZ-REEL?
The ±5 V bipolar input range on the AD7880BRZ-REEL is configured by connecting VINA to the signal source, VINB to VREF, and VREF to VDD (+5 V), per Figure 7 in the datasheet. This arrangement uses the internal resistor network to center the 12-bit code range at mid-scale (0x800), yielding LSB = 2.44 mV and full-scale span of 10 V.
Can the AD7880BRZ-REEL interface directly with an 8086 microprocessor?
Yes, the AD7880BRZ-REEL interfaces directly with the 8086 microprocessor using its parallel three-state data bus and standard control signals. As shown in Figure 19 of the datasheet, the 8086 WR signal is gated with address decode to generate CONVST, while CS and RD are driven from address/data bus controls-no glue logic is required beyond basic NAND/OR gates.
What is the power consumption of the AD7880BRZ-REEL in power-save mode?
In power-save mode (MODE = 0 V), the AD7880BRZ-REEL draws 750 µA typical (1 mA max over temperature) from the +5 V supply, resulting in 3.75 mW typical (5 mW max) power dissipation. This state disables the internal clock oscillator and analog circuitry while retaining register state, allowing wake-up in <1 µs upon MODE reassertion.
AD7880BRZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-REEL FAQ
1.How can I place an order for AD7880BRZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7880BRZ-REEL 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-REEL reliable?
The price and inventory of AD7880BRZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7880BRZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7880BRZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7880BRZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7880BRZ-REEL?
AD7880BRZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7880BRZ-REEL 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-REEL?
For technical support, including AD7880BRZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7880BRZ-REEL requirements.
6.How does Aetrix verify that AD7880BRZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7880BRZ-REEL 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-REEL meets industry standards.
7.What is the process for return or replacement of AD7880BRZ-REEL?
All AD7880BRZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7880BRZ-REEL, 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-REEL part is unused and in its original packaging.
Return procedure for AD7880BRZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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