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Analog Devices Inc. AD7880BR
- Part No.:
- AD7880BR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7880BR.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,088
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Product details
Overview
AD7880BR from Analog Devices is a 12-bit monolithic successive-approximation ADC with single +5 V supply operation, 66 kHz throughput rate, 12 µs conversion time, and 3 µs track/hold acquisition - used in battery-powered portable systems and digital signal processing for high-fidelity analog-to-digital conversion of ±5 V, 0–5 V, or 0–10 V input signals.
For engineers reviewing the AD7880BR datasheet, AD7880BR pinout, AD7880BR application, or AD7880BR equivalent, this page delivers verified technical context, real-world interface timing constraints, dynamic performance metrics (70 dB SNR, –80 dB THD), package-specific layout guidance (SOIC-24), and validated alternative options for industrial and embedded signal acquisition designs.
Technical Context
The AD7880BR integrates a charge-balanced comparator-based track/hold amplifier, 12-bit voltage-output DAC, and SAR logic - enabling inherent 12-bit acquisition in ≤3 µs without external hold capacitors. Its LC2MOS process combines bipolar precision with CMOS low-power logic.
It supports three user-configurable analog input ranges (±VREF, 0 to VREF, 0 to 2×VREF) using internal resistor networks, all operating from a single +5 V supply with VREF typically tied to VDD. Conversion is initiated asynchronously by CONVST rising edge, independent of CS and RD, with BUSY indicating active conversion status.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with straight-binary encoding |
| Throughput Rate | 66 kHz - enables full-power sampling of up to 33 kHz sinusoidal signals |
| Conversion Time | 12 µs max - deterministic latency critical for real-time control loops |
| Track/Hold Acquisition | 3 µs max - ensures accurate capture of fast-changing inputs before conversion |
| Signal-to-Noise Ratio | 70 dB min - measured at 1 kHz input, fSAMPLE = 66 kHz; supports >11.5 ENOB up to 12 kHz |
| Power Dissipation (Normal) | 25 mW typ at +25°C - enables thermal management in dense PCB layouts |
| Power Dissipation (Save Mode) | 2 mW typ at +25°C - extends battery life in portable instrumentation |
| Analog Input Ranges | ±5 V, 0–5 V, or 0–10 V - selectable via external pin connections, no external op amps required |
Pinout & Package
AD7880BR is housed in a 24-lead Small Outline Integrated Circuit (SOIC) package with standard 0.3-inch width, gull-wing leads, and JEDEC MS-013AC footprint - compatible with automated SMT assembly and reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA | Analog Input A | Primary differential input terminal; connects to signal source in ±VREF, 0–VREF, or 0–2VREF configurations |
| VINB | Analog Input B | Secondary input for bipolar mode (tied to VREF) or unipolar reference (tied to AGND) |
| AGND | Analog Ground | Separate ground return for analog circuitry; must be isolated from DGND at single point |
| VREF | Reference Input | Accepts 2.5–5 V; typically tied to VDD; sets full-scale range and LSB size (e.g., 1.22 mV @ 0–5 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 low |
| BUSY | Status Output | Active-low open-drain indicator; remains low during 12 µs conversion; used for interrupt or polling |
| CLKIN | Master Clock Input | TTL/CMOS-compatible; 2.5 MHz nominal; mark/space ratio 40/60 to 60/40 accepted |
| DGND | Digital Ground | Dedicated return for logic I/O; connected to system digital ground plane |
| DB0–DB11 | Data Outputs | Three-state parallel outputs; high-impedance when CS or RD is high; 57 ns access time after RD |
| MODE | Power Mode Control | High = normal operation (25 mW); low = power-save mode (2 mW); direct logic-level control |
| VDD | Supply Voltage | +5 V ±5%; powers both analog and digital sections; decoupling capacitor required near pin |
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 |
| Configurable Input Ranges | Hardware-selectable ±5 V, 0–5 V, or 0–10 V modes via VINA/VINB/VREF wiring - no external gain/attenuation |
| Low-Power Power-Save Mode | 2 mW typical consumption with MODE = 0 V - extends runtime in handheld test equipment |
| Fast Parallel Interface | 57 ns data access time and 3-state outputs enable direct connection to 16-bit microprocessors (e.g., MC68000, TMS320C25) |
| On-Chip Track/Hold | 3 µs acquisition time eliminates external sample-and-hold IC - reduces BOM count and board area |
| Dynamic Performance Guaranteed | 70 dB SNR and –80 dB THD specified at 66 kHz sampling - validated for speech, modem, and radar signal chains |
Applications
| Battery-Powered Data Loggers | DSP-Based Motor Control |
|---|---|
Use Scenario: Continuous monitoring of temperature, pressure, and current in field-deployed environmental sensors powered by Li-ion batteries. IC Role / Device Role / Timing Role: Primary ADC capturing multi-channel analog sensor outputs at 10–50 kHz rates with minimal power overhead. Use Value: 2 mW power-save mode extends operational life beyond 6 months per charge; SOIC-24 footprint enables compact PCB layout. |
Use Scenario: Real-time acquisition of motor phase currents and back-EMF for closed-loop field-oriented control in industrial inverters. IC Role / Device Role / Timing Role: High-speed analog front-end feeding DSP (e.g., ADSP-2100) with synchronized 66 kHz sampling for torque ripple suppression. Use Value: 12 µs conversion + 3 µs acquisition enables <15 µs total throughput - meets sub-20 µs control loop deadlines. |
| Telecom Line Card Monitoring | Audio Digitization in Voice Gateways |
Use Scenario: Supervisory voltage/current sensing on PSTN line cards to detect off-hook, ring detection, and fault conditions. IC Role / Device Role / Timing Role: Dual-input ADC measuring tip/ring differential and common-mode voltages across multiple lines. Use Value: ±5 V bipolar range supports legacy telephony signaling levels; 70 dB SNR ensures clean detection in noisy central office environments. |
Use Scenario: Digitizing analog voice signals in VoIP gateways prior to G.711/G.729 encoding. IC Role / Device Role / Timing Role: Low-distortion ADC providing 8 kHz Nyquist-sampled audio with minimal harmonic artifacts. Use Value: –80 dB THD and 70 dB SNR preserve voice clarity; 0–5 V unipolar mode matches standard codec input drive requirements. |
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 |
|---|---|---|---|
| AD7890BRZ-1 | 12-bit, 100 kSPS, serial SPI interface, integrated reference, 24-lead SOIC - higher speed but no parallel bus | Requires SPI controller instead of MPU data bus; lacks CONVST/BUSY handshake for deterministic timing | Select when board space is constrained and microcontroller has SPI; avoid when interfacing legacy 16-bit parallel buses |
| MAX195BCPP | 16-bit, 100 kSPS, serial interface, ±5 V supply, 20-lead PDIP - higher resolution but no power-save mode | Higher ENOB (>14 bits) but consumes 120 mW continuously; incompatible pinout and control protocol | Choose for precision instrumentation needing >12-bit accuracy; reject for battery-powered or timing-critical systems |
Compared with AD7880BR, AD7890BRZ-1 offers faster sampling and smaller footprint but sacrifices parallel interface determinism, while MAX195BCPP delivers superior resolution at significantly higher power and no low-power sleep state - making AD7880BR optimal for cost-sensitive, timing-critical, and battery-operated 12-bit acquisition.
Availability
AD7880BR is available at Aetrix Electronics and suitable for battery-powered portable systems, digital signal processing subsystems, and speech recognition hardware requiring stable component supply and long-term industrial temperature support (–40°C to +85°C).
Supply support for AD7880BR 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 AD7880BR belongs to Analog Devices' LC2MOS precision data acquisition product line, designed specifically for low-power, single-supply, high-throughput 12-bit SAR ADC applications in portable instrumentation and real-time control systems.
FAQ
What is the maximum clock frequency supported by the AD7880BR?
The AD7880BR is specified for reliable operation at 2.5 MHz CLKIN. While it may function at slightly higher frequencies, accuracy degrades due to track/hold capacitor leakage - linearity error increases above 3 MHz per Figure 10. For guaranteed 12-bit performance, maintain CLKIN at exactly 2.5 MHz with 40/60 to 60/40 duty cycle. The AD7880BR datasheet confirms 12 µs conversion time assumes 2.5 MHz clocking.
Does the AD7880BR require external calibration components?
No, the AD7880BR operates without external trim components for basic functionality. Offset and full-scale adjustments are optional and only needed in high-precision applications - Figure 11 shows an external op-amp and potentiometer circuit for fine-tuning, but the AD7880BR delivers ±15 LSB full-scale error and ±10 LSB bipolar zero error without them. These errors are within spec for most DSP and control uses.
Can the AD7880BR interface directly with a 3.3 V microcontroller?
Yes - the AD7880BR's logic inputs (CS, CONVST, RD, MODE, CLKIN) accept TTL/CMOS levels: VINH ≥ 2.4 V and VINL ≤ 0.8 V. Its outputs (DB0–DB11, BUSY) drive to ≥4.0 V high and ≤0.4 V low under load, so level-shifting is unnecessary when interfacing with 3.3 V controllers that tolerate 5 V-tolerant inputs. However, ensure DGND is referenced correctly and avoid exceeding absolute max ratings on digital pins.
What analog input configuration does the AD7880BR use for ±5 V operation?
For ±5 V bipolar input, the AD7880BR requires VREF = VDD = +5 V, VINA connected to the signal source, and VINB tied to VREF (pin 4). This configures the internal resistor network per Figure 7, yielding a 10 V full-scale range centered at 0 V, with straight-binary output where 0x800 = 0 V and 0xFFF = +4.998 V. The AD7880BR achieves ±10 LSB bipolar zero error over –40°C to +85°C.
Is the AD7880BR pin-compatible with other AD7880 variants like AD7880BN or AD7880CQ?
Yes - all AD7880 variants (BN, BQ, BR, CN, CQ, CR) share identical 24-pin SOIC (R), plastic DIP (N), and CERDIP (Q) footprints and pinouts. The suffix denotes grade (B/C), temperature range (–40°C to +85°C), and package type only. AD7880BR uses the same SOIC-24 lead frame and electrical pin functions as AD7880BN and AD7880CQ, enabling drop-in replacement where performance tolerances allow.
AD7880BR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- -
AD7880BR FAQ
1.How can I place an order for AD7880BR through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7880BR 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 AD7880BR reliable?
The price and inventory of AD7880BR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7880BR is usually 5 days.
3.What payment methods are accepted for AD7880BR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7880BR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7880BR?
AD7880BR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7880BR 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 AD7880BR?
For technical support, including AD7880BR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7880BR requirements.
6.How does Aetrix verify that AD7880BR is sourced from the original manufacturer or authorized distributors?
All AD7880BR 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 AD7880BR meets industry standards.
7.What is the process for return or replacement of AD7880BR?
All AD7880BR units undergo pre-shipment inspection (PSI). If there is an issue with AD7880BR, 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 AD7880BR part is unused and in its original packaging.
Return procedure for AD7880BR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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