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Analog Devices Inc. AD7665AST
- Part No.:
- AD7665AST
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
AD7665AST.pdf
- Description:
- IC ADC 16BIT CMOS 5V 48-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:526
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Product details
Overview
AD7665AST from Analog Devices is a 16-bit, 570 kSPS charge redistribution SAR analog-to-digital converter operating from a single 5 V supply. It delivers ±2.5 LSB INL, 90 dB SNR at 180 kHz, and supports bipolar (±10 V, ±5 V) and unipolar (0–10 V) input ranges. It serves as the high-speed precision front-end ADC in data acquisition systems requiring no pipeline delay and simultaneous channel sampling.
For engineers reviewing the AD7665AST datasheet, AD7665AST pinout, AD7665AST application, or AD7665AST equivalent, this page provides verified specifications, validated LQFP-48 pin mapping, confirmed Warp/Normal/Impulse mode timing behavior, and two field-deployed alternative parts with documented functional trade-offs.
Technical Context
The AD7665AST implements a capacitor-based charge redistribution SAR architecture with internal resistor-scaler network enabling configurable analog input ranges. Its conversion core uses a 16-bit binary-weighted capacitive DAC and comparator with dummy capacitor for common-mode rejection.
It supports three hardware-selectable modes: Warp (1.75 µs cycle, 570 kSPS), Normal (2 µs cycle, 500 kSPS), and Impulse (2.25 µs cycle, 444 kSPS with throughput-scaled power). Interface flexibility includes parallel (8/16-bit, 5 V/3 V tolerant) and SPI/QSPI/MICROWIRE-compatible serial modes with selectable clock polarity and frame sync.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full code coverage across temperature. |
| Throughput Rate | 570 kSPS in Warp Mode - enables real-time spectral analysis of signals up to 180 kHz with 90 dB SNR. |
| INL | ±2.5 LSB max - ensures <0.0038% full-scale linearity error for precision instrumentation calibration. |
| Analog Input Ranges | Bipolar ±10 V / ±5 V / ±2.5 V and unipolar 0–10 V / 0–5 V / 0–2.5 V - selectable via external resistor network per Table I. |
| Power Dissipation | 64 mW typical at 570 kSPS - reduces thermal load in dense DAQ modules; drops to 15 µW in power-down mode. |
| Interface | Parallel (16-bit or byte-swapped 8-bit) and 2-wire serial - interoperates with both 3 V and 5 V host logic without level shifters. |
| Aperture Jitter | 5 ps rms - preserves ENOB >14.8 bits at 180 kHz input, critical for high-fidelity spectrum analysis. |
Pinout & Package
AD7665AST is supplied in a 48-lead LQFP package (ST-48 footprint) with exposed paddle thermally connected to AGND. Pin functions are electrically validated per Analog Devices' AD7665 Rev. C datasheet (pp. 5–7).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 36, AGND | Analog ground reference | Must be star-connected to analog section ground plane; separates noise-sensitive analog circuitry from digital return paths. |
| 2, AVDD | Analog power supply | 5 V ±5% supply for internal scaler, DAC, and comparator; requires local 10 µF + 100 nF decoupling. |
| 5, OB/2C | Output format select | HIGH = straight binary; LOW = twos complement - determines sign interpretation for bipolar inputs. |
| 6, WARP | High-speed mode control | HIGH (with IMPULSE LOW) enables 570 kSPS; mandates minimum conversion rate to maintain full accuracy. |
| 8, SER/PAR | Interface mode select | LOW = parallel bus active (D[15:0], RD, CS); HIGH = serial pins repurposed (SDOUT, SCLK, SYNC). |
| 17, OGND | I/O interface ground | Isolates OVDD-supplied digital interface from DVDD domain; prevents logic-level crosstalk. |
| 21, SDOUT | Serial data output | MSB-first, synchronous to SCLK; valid on both edges when EXT/INT = LOW (master mode). |
| 29, BUSY | Conversion status flag | HIGH during conversion; falling edge signals latched result ready - usable as data-ready strobe in FPGA interfaces. |
| 35, CNVST | Conversion start trigger | Falling edge initiates sample-and-hold hold phase; in Impulse Mode, held LOW triggers immediate conversion post-acquisition. |
| 37, REF | Reference voltage input | Accepts 2.3–2.5 V external reference; sets full-scale range - e.g., 2.5 V REF yields ±10 V input range with 4R scaling. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Immediate data availability after BUSY falls - eliminates latency-induced phase errors in closed-loop control. |
| Hardware-calibrated INL | Factory-trimmed to ±2.5 LSB max across –40°C to +85°C - removes need for system-level linearity correction. |
| Configurable input scaling | Resistor network (IND/INC/INB/INA) selects ±10 V, ±5 V, 0–10 V, etc. - enables single BOM for multiple sensor signal ranges. |
| Multi-voltage interface | OVDD supports 2.7–5.25 V - allows direct connection to 3 V microcontrollers or 5 V FPGAs without level translation. |
| Three power-performance modes | Warp (570 kSPS), Normal (500 kSPS), Impulse (444 kSPS with linear power scaling) - matches throughput to application demand. |
Applications
| Data Acquisition Systems | Communications Test Equipment |
|---|---|
Use Scenario: High-channel-count industrial DAQ module acquiring synchronized voltage/current waveforms from 16 sensors at 500 kSPS. IC Role / Device Role / Timing Role: Primary SAR ADC with zero-latency conversion and hardware-triggered CNVST for deterministic sampling alignment. Use Value: Enables simultaneous multi-channel capture without inter-channel skew; 90 dB SNR preserves dynamic range for low-amplitude fault signatures. | Use Scenario: 5G NR base station receiver test set measuring EVM and ACLR across 100 MHz bandwidth. IC Role / Device Role / Timing Role: Digitizer front-end capturing IF samples at 570 kSPS in Warp Mode with precise aperture jitter control. Use Value: 5 ps rms aperture jitter maintains >14.8 ENOB at 180 kHz, ensuring measurement fidelity meets 3GPP conformance limits. |
| Spectrum Analyzers | Medical Imaging Signal Chain |
Use Scenario: Portable handheld spectrum analyzer performing real-time FFT on 180 kHz RF input with 4096-point resolution. IC Role / Device Role / Timing Role: High-SNR ADC feeding FPGA-based FFT engine; uses parallel 16-bit interface for burst data transfer. Use Value: 90 dB SNR and –100 dB THD suppress spurious artifacts below –100 dBc, enabling clean spectral display down to noise floor. | Use Scenario: Ultrasound beamformer digitizing echo returns from 128 transducer elements with time-aligned sampling. IC Role / Device Role / Timing Role: Channel ADC in multi-chip array; leverages BUSY falling edge as hardware strobe for FPGA timestamping. Use Value: Use Value: No missing codes and ±2.5 LSB INL ensure accurate amplitude reconstruction of weak echo signals across full dynamic range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed precision ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7664ASTZ | 16-bit, 500 kSPS, same LQFP-48 package; lacks Warp Mode; INL ±3 LSB max. | Lower throughput and slightly reduced linearity - suitable where 500 kSPS suffices and cost sensitivity outweighs 70 kSPS gain. | Select AD7664ASTZ if system does not require >500 kSPS and budget constraints favor legacy qualification. |
| AD7671ASTZ | 16-bit, 1 MSPS, higher power (120 mW), different pinout (no BYTESWAP, OB/2C); requires external reference buffer. | Higher speed but incompatible interface and layout - demands PCB redesign and added support components. | Choose AD7671ASTZ only when 1 MSPS is mandatory and board revision is feasible. |
Compared with AD7665AST, AD7664ASTZ offers identical form factor and lower cost at 500 kSPS, while AD7671ASTZ delivers higher throughput at the expense of pin compatibility and increased system complexity.
Availability
AD7665AST is available at Aetrix Electronics and suitable for data acquisition, communications test equipment, and medical imaging systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for AD7665AST 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, headquartered in Norwood, MA.
The AD7665AST belongs to the PulSAR® family of precision SAR ADCs, designed specifically for high-throughput, low-latency, wide-dynamic-range applications in instrumentation, spectrum analysis, and industrial DAQ.
FAQ
What is the maximum sampling rate of the AD7665AST and under what conditions is it achieved?
The AD7665AST achieves a maximum sampling rate of 570 kSPS in Warp Mode, which requires WARP = HIGH and IMPULSE = LOW. This mode mandates a minimum conversion rate to maintain full specified accuracy; timing must adhere to t2 ≤ 1 ms between conversions per the datasheet's Table III. The AD7665AST sustains this rate with 90 dB SNR at 180 kHz input and consumes 64 mW typical power.
Does the AD7665AST support both bipolar and unipolar analog input ranges, and how are they configured?
Yes, the AD7665AST supports bipolar (±10 V, ±5 V, ±2.5 V) and unipolar (0–10 V, 0–5 V, 0–2.5 V) input ranges. Configuration is accomplished by connecting the four analog input terminals (IND, INC, INB, INA) to either the input signal, INGND, or REF per Table I in the datasheet. For example, ±10 V range uses IND = VIN, INC = INGND, INB = INGND, INA = REF with 4R scaling network.
What interface options does the AD7665AST provide, and are they compatible with 3 V logic systems?
The AD7665AST provides both parallel (16-bit or byte-swapped 8-bit) and serial (SPI/QSPI/MICROWIRE/DSP-compatible) interfaces. Its OVDD pin accepts 2.7–5.25 V, allowing direct interfacing with 3 V microcontrollers or FPGAs without level shifters. In serial mode, SDOUT, SCLK, and SYNC operate at OVDD logic levels, and the device tolerates 3 V–5 V digital signaling per VIH/VIL specs.
How does the AD7665AST handle power management, and what is its lowest power state?
The AD7665AST features three operational modes (Warp, Normal, Impulse) and a dedicated power-down mode. In power-down mode (PD = HIGH), it draws ≤7 µW - verified across –40°C to +85°C. Power scales linearly with throughput in Impulse Mode, dropping to 15 µW at 100 SPS. All modes retain configuration registers and require no reinitialization upon wake-up.
Is the AD7665AST pin-to-pin compatible with other devices in its family, and which ones?
Yes, the AD7665AST is pin-to-pin compatible with the AD7663ASTZ and AD7664ASTZ in the same 48-lead LQFP package. This allows drop-in upgrades: AD7663ASTZ (true bipolar, 500 kSPS) and AD7664ASTZ (differential input, 500 kSPS) share identical pinout, power, and interface signaling - enabling migration without PCB changes when enhanced performance or feature set is required.
AD7665AST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 48-LQFP
- Packaging:
- Bag
- Product Status:
- Obsolete
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 570k
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 48-LQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7665AST FAQ
1.How can I place an order for AD7665AST through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7665AST 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 AD7665AST reliable?
The price and inventory of AD7665AST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7665AST is usually 5 days.
3.What payment methods are accepted for AD7665AST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7665AST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7665AST?
AD7665AST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7665AST 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 AD7665AST?
For technical support, including AD7665AST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7665AST requirements.
6.How does Aetrix verify that AD7665AST is sourced from the original manufacturer or authorized distributors?
All AD7665AST 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 AD7665AST meets industry standards.
7.What is the process for return or replacement of AD7665AST?
All AD7665AST units undergo pre-shipment inspection (PSI). If there is an issue with AD7665AST, 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 AD7665AST part is unused and in its original packaging.
Return procedure for AD7665AST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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