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Analog Devices Inc. AD7886JP
- Part No.:
- AD7886JP
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-LCC (J-Lead)
- Datasheet:
-
AD7886JP.pdf
- Description:
- IC ADC 12BIT FLASH 28PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,600
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Product details
Overview
AD7886JP from Analog Devices is a 12-bit, LC2MOS sampling ADC with 750 kHz throughput rate, 1 µs conversion time, and ±2 LSB integral linearity over 0°C to +70°C. It features a built-in sample-and-hold amplifier, on-chip clock oscillator, and three-state parallel digital interface-designed for high-speed data acquisition in DSP servo control and spectrum analysis systems.
For engineers reviewing the AD7886JP datasheet, AD7886JP pinout, AD7886JP application, or AD7886JP equivalent, this page delivers verified technical context, real-world timing behavior, analog input range configuration options (0 V–5 V / 0 V–10 V / ±5 V), dynamic performance metrics (65 dB SNR at 100 kHz), and microprocessor interface timing compliance (57 ns max data access).
Technical Context
The AD7886JP implements a triple-pass flash architecture using 15 comparators and a 4096-resistor DAC to achieve 12-bit accuracy in 950 ns typical conversion time. Its track-and-hold amplifier acquires signals to 12-bit accuracy in ≤333 ns, enabling a total throughput interval of 1.333 µs.
Conversion is initiated by CONVST falling edge (track-to-hold transition), with full conversion beginning on the rising edge; BUSY goes low during conversion and returns high when data is latched and ready. The device requires ±5 V supplies, supports pin-strappable unipolar/bipolar input ranges, and uses an internal –3.5 V reference derived via on-chip R1/R2 resistors (9 kΩ/6.3 kΩ) from external +5 V references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - guarantees no missing codes across operating temperature range. |
| Throughput Rate | 750 kHz - enables ≥1.333 µs minimum sampling interval for continuous high-speed acquisition. |
| SNR @ 100 kHz | 65 dB min - defines usable dynamic range for speech recognition and spectral analysis inputs. |
| Integral Linearity | ±2 LSB max - ensures monotonic transfer function and predictable code transitions. |
| Power Dissipation | 250 mW typ - achieved via LC2MOS process, supporting low-thermal-load embedded designs. |
| Data Access Time | 57 ns max - allows direct interfacing with modern microprocessors and DSPs without wait states. |
| Analog Input Ranges | 0 V to 5 V, 0 V to 10 V, or ±5 V - selected via VIN2 pin strapping, eliminating external scaling circuitry. |
Pinout & Package
AD7886JP is supplied in a 28-pin Plastic Leaded Chip Carrier (PLCC, package code P-28A2) with gull-wing leads and exposed thermal pad (not electrically connected). Pin 1 is located at the index corner; pin numbering proceeds counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pins 10, 19) | Positive Power Supply | +5 V ±5% supply rail; both pins must be tied together and decoupled locally. |
| VSS (Pins 15, 24) | Negative Power Supply | –5 V ±5% supply rail; both pins must be tied together and decoupled locally. |
| AGND (Pins 16, 23) | Analog Ground Reference | Return path for analog circuitry; must be isolated from DGND except at single-point star ground. |
| DGND (Pin 5) | Digital Ground Reference | Return path for logic outputs and control inputs; separate from AGND to minimize noise coupling. |
| VIN1 / VIN2 (Pins 17, 18) | Configurable Analog Inputs | VIN1 is primary signal input; VIN2 selects range: tied to VIN1 (0–5 V), AGND (0–10 V), or +5REF (±5 V). |
| +5REF (Pin 20) | +5 V Reference Input | External +5 V reference source used with SUM and VREF to generate internal –3.5 V reference. |
| SUM (Pin 21) | Reference Summing Node | Internal node for resistor-divider network (R1/R2) that scales +5REF to required –3.5 V reference. |
| VREF (Pin 22) | Voltage Reference Input | Accepts –3.5 V ±2%; internally referenced to all analog conversions and DAC ladder. |
| DB0–DB11 (Pins 1–4, 6–9, 25–28) | Three-State Parallel Data Outputs | 12-bit natural binary output (DB11 = MSB); enabled only when CS and RD are low. |
| BUSY (Pin 11) | Conversion Status Indicator | Active-low open-drain output; low during conversion, high when data is valid and latched. |
| CS (Pin 12) | Chip Select Input | Active-low enable for data bus drivers; must be low before RD to avoid bus contention. |
| RD (Pin 13) | Read Strobe Input | Active-low signal that gates DB0–DB11 onto data bus; controls output enable timing. |
| CONVST (Pin 14) | Conversion Start Input | Falling edge initiates track-to-hold; rising edge triggers conversion start; pulse width ≥50 ns. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip clock oscillator | Eliminates need for external timing components; provides precise staging for triple-pass flash conversion. |
| Pin-strappable input ranges | Supports 0 V–5 V, 0 V–10 V, and ±5 V configurations via VIN2 connection-no external op amps required. |
| Fast microprocessor interface | 57 ns max data access time and standard CS/RD control signals enable direct connection to TMS320C10, ADSP-2100, and similar DSPs. |
| LC2MOS fabrication | Combines bipolar precision with CMOS logic density and low power (250 mW typ), enabling high-speed operation without thermal throttling. |
| Dynamic performance specification | Guaranteed 65 dB SNR, –75 dB THD, and –80 dB IMD at 100 kHz input-validated for DSP signal integrity requirements. |
Applications
| Digital Signal Processing | Spectrum Analysis |
|---|---|
Use Scenario: Real-time capture of baseband audio or IF signals sampled at 750 kHz for FFT-based processing. IC Role / Device Role / Timing Role: High-throughput ADC providing synchronized 12-bit samples to DSP memory-mapped address space via CS/RD handshake. Use Value: 65 dB SNR and ±2 LSB linearity preserve signal fidelity across Nyquist band, enabling accurate spectral bin resolution. |
Use Scenario: Acquisition of RF or vibration sensor outputs for frequency-domain characterization in test equipment. IC Role / Device Role / Timing Role: Precision sampling front-end with programmable input range selection to match transducer output swing. Use Value: Pin-strappable 0 V–10 V range accommodates high-dynamic-range sensors without external gain stages. |
| Speech Recognition | DSP Servo Control |
Use Scenario: Digitizing microphone preamp outputs in embedded voice command systems operating at ambient temperature. IC Role / Device Role / Timing Role: Low-power, high-SNR ADC interfaced to microcontroller via parallel bus; triggered by timer-driven CONVST pulses. Use Value: 250 mW typical dissipation enables fanless operation; 1.333 µs throughput supports >700 kSPS frame rates for MFCC extraction. |
Use Scenario: Closed-loop position/velocity feedback sampling in industrial motor drives requiring deterministic latency. IC Role / Device Role / Timing Role: Synchronized acquisition node where BUSY interrupt signals completion to DSP for PID computation. Use Value: Guaranteed 57 ns data access and 100 ns BUSY-to-CONVST timing ensure sub-microsecond control loop jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7886KP | Same package and pinout; higher SNR (67 dB vs. 65 dB) and same ±2 LSB linearity, rated for same 0°C to +70°C range. | Preferred where improved dynamic range is critical (e.g., low-level signal detection in spectrum analyzers). | Select AD7886KP if system-level SNR margin is constrained and 2 dB improvement justifies cost premium. |
| AD7886BD | DIP package (D-28), wider –40°C to +85°C temperature range, identical 67 dB SNR and ±2 LSB linearity. | Suitable for industrial environments requiring extended thermal stability and through-hole assembly. | Choose AD7886BD for ruggedized designs needing broader operating temperature and legacy DIP compatibility. |
Compared with AD7886JP, AD7886KP offers higher SNR in identical packaging for enhanced signal fidelity, while AD7886BD trades PLCC for DIP and extends temperature range-neither is pin-compatible with AD7886JP due to differing packages, but all share identical functional interface and timing behavior.
Availability
AD7886JP is available at Aetrix Electronics and suitable for digital signal processing, spectrum analysis, and DSP servo control applications requiring stable component supply, long-term obsolescence management, and traceable sourcing for industrial OEM programs.
Supply support for AD7886JP 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD7886JP belongs to Analog Devices' precision high-speed ADC product line, engineered for demanding data acquisition systems where speed, linearity, and dynamic range must coexist within tight power and thermal budgets.
FAQ
What is the maximum sampling rate supported by the AD7886JP?
The AD7886JP is specified for a 750 kHz throughput rate, corresponding to a minimum sampling interval of 1.333 µs. This includes both conversion time (950 ns typ) and track/hold acquisition time (≤333 ns). While a 1 MHz version exists per the datasheet footnote, the AD7886JP variant is rated and tested exclusively at 750 kHz under all conditions including temperature and supply variation.
How do I configure the AD7886JP for ±5 V analog input range?
To configure the AD7886JP for ±5 V input, connect VIN2 (Pin 18) to the +5REF pin (Pin 20). VIN1 (Pin 17) becomes the signal input, and the internal resistor network scales the input to match the –3.5 V reference. This configuration yields offset binary output coding with 2.44 mV/LSB resolution and full-scale span of 10 V centered at 0 V.
Does the AD7886JP require an external clock source?
No, the AD7886JP contains an integrated clock oscillator and timer circuit that generates all internal timing signals for the triple-pass flash conversion sequence. No external clock is needed-only the CONVST signal is required to initiate each conversion cycle. This simplifies system design and eliminates clock distribution skew concerns.
What is the purpose of the SUM and +5REF pins on the AD7886JP?
The +5REF (Pin 20) accepts an external +5 V reference voltage, which-combined with the internal R1 (9 kΩ) and R2 (6.3 kΩ) resistors and the SUM (Pin 21) node-forms a precision divider network to generate the required –3.5 V reference at VREF (Pin 22). This eliminates need for external negative reference ICs while maintaining ±2% accuracy over temperature.
Can the AD7886JP interface directly with a TMS320C10 DSP processor?
Yes, the AD7886JP is explicitly validated for direct interface with the TMS320C10 DSP. Its 57 ns max data access time, active-low BUSY interrupt, and standard CS/RD control protocol align with the C10's memory-mapped peripheral timing. Application diagrams in the datasheet (Figures 15–16) confirm this integration, using BUSY to trigger CPU interrupts and CS/RD to read DB0–DB11 after conversion completion.
AD7886JP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 750k
- 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:
- Flash
- Reference Type:
- External
- Voltage - Supply, Analog:
- ±5V
- Voltage - Supply, Digital:
- ±5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-PLCC (11.51x11.51)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7886JP FAQ
1.How can I place an order for AD7886JP through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7886JP 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 AD7886JP reliable?
The price and inventory of AD7886JP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7886JP is usually 5 days.
3.What payment methods are accepted for AD7886JP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7886JP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7886JP?
AD7886JP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7886JP 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 AD7886JP?
For technical support, including AD7886JP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7886JP requirements.
6.How does Aetrix verify that AD7886JP is sourced from the original manufacturer or authorized distributors?
All AD7886JP 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 AD7886JP meets industry standards.
7.What is the process for return or replacement of AD7886JP?
All AD7886JP units undergo pre-shipment inspection (PSI). If there is an issue with AD7886JP, 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 AD7886JP part is unused and in its original packaging.
Return procedure for AD7886JP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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