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Analog Devices Inc. AD6644ASTZ-40
- Part No.:
- AD6644ASTZ-40
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 52-LQFP
- Datasheet:
-
AD6644ASTZ-40.pdf
- Description:
- IC ADC 14BIT PIPELINED 52LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,021
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Product details
Overview
AD6644ASTZ-40 from Analog Devices is a monolithic 14-bit, 40 MSPS analog-to-digital converter (ADC) with differential analog inputs, 100 dB two-tone SFDR, 74 dB SNR at 2.2 MHz, and 250 MHz analog input bandwidth. It integrates on-chip track-and-hold and 2.4 V reference, operates from 5 V AVCC and 3.3 V DVCC, and targets IF sampling in multichannel digital receivers.
For engineers reviewing the AD6644ASTZ-40 datasheet, AD6644ASTZ-40 pinout, AD6644ASTZ-40 application, or AD6644ASTZ-40 equivalent, key selection considerations include guaranteed 40 MSPS sample rate, differential encode interface, CMOS-compatible 3.3 V digital outputs, aperture jitter < 0.3 ps rms, and LQFP-52 packaging for RF receiver signal chains.
Technical Context
The AD6644ASTZ-40 employs a three-stage subrange architecture with pipelined track-and-hold stages (TH1–TH5), 5-bit coarse ADC1 + DAC1 (laser-trimmed), 5-bit ADC2 + DAC2, and final 6-bit ADC3. Digital error correction logic combines outputs to deliver 14-bit twos-complement data.
It features fully differential analog input stage (AIN/AIN, ±0.55 V around 2.4 V common-mode), differential encode inputs (ENCODE/ENCODE), and internal timing generation. The 250 MHz analog input bandwidth supports wideband IF sampling up to Nyquist, while 100 dB two-tone SFDR enables high-fidelity multitone signal capture in CDMA/WCDMA systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 quantization levels for high dynamic range digitization of IF signals. |
| Sample Rate | 40 MSPS - guaranteed maximum conversion rate; supports Nyquist zone up to 20 MHz without aliasing. |
| Two-Tone SFDR | 100 dBFS - enables clean separation of closely spaced interferers in multimode receiver front ends. |
| SNR @ 2.2 MHz | 74.5 dB - defines minimum detectable signal level above quantization + thermal noise floor. |
| Analog Input BW | 250 MHz - allows direct sampling of IF signals up to 250 MHz, supporting wide-channel CDMA/WCDMA. |
| Aperture Jitter | 0.2 ps rms - limits sampling uncertainty-induced noise degradation at high input frequencies. |
| Power Dissipation | 1.3 W - total supply power (276 mA AVCC @ 5 V + 36 mA DVCC @ 3.3 V) for thermal management planning. |
| Digital Interface | 3.3 V CMOS - compatible with standard ASIC/FPGA I/O banks without level-shifting circuitry. |
Pinout & Package
AD6644ASTZ-40 is housed in a 52-lead plastic low-profile quad flat package (LQFP), RoHS-compliant, rated for −25°C to +85°C ambient operation. Thermal resistance θJA = 33°C/W on a 6-layer PCB with solid ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN / AIN | Differential analog input | Accepts ±0.55 V swing around 2.4 V common-mode; 2.2 V p-p full-scale differential input range. |
| ENCODE / ENCODE | Differential clock input | Conversion initiated on rising edge; requires low-jitter differential source (e.g., transformer-coupled). |
| VREF | Analog reference output | Stable 2.4 V reference; must be bypassed to GND with 0.1 µF microwave capacitor. |
| C1 / C2 | Internal reference compensation | Bypass pins for internal voltage reference stability; each requires 0.1 µF microwave capacitor to GND. |
| D0–D13 | Parallel digital output | 14-bit twos-complement CMOS outputs (D0 LSB to D13 MSB); 3.3 V logic compatible. |
| DRY | Data ready strobe | Inverted, delayed version of ENCODE; indicates valid data window for latching D0–D13. |
| OVR | Overrange flag | Active-high signal indicating analog input exceeded ±FS; used for AGC or clipping detection. |
| DMID | Digital output midpoint | Approximately DVCC/2 (1.65 V); provides reference for data valid window timing. |
| AVCC (Pins 8,9,14,16,18,22,26,28,30) | Analog power supply | 5 V ±2.5% supply for analog core; multiple pins reduce IR drop and improve PSRR. |
| DVCC (Pins 1,33,43) | Digital power supply | 3.3 V ±10% supply for output drivers only; decoupling critical for noise-sensitive CMOS outputs. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed 40 MSPS sample rate | Enables deterministic timing budget allocation in real-time IF sampling systems without derating. |
| On-chip track-and-hold and 2.4 V reference | Eliminates external TH and reference ICs, reducing BOM count and layout sensitivity to clock feedthrough. |
| Differential analog and encode interfaces | Rejects common-mode noise from RF front ends and clock distribution paths, improving SNR in dense layouts. |
| 100 dB two-tone SFDR over Nyquist band | Supports simultaneous reception of multiple carriers in software-defined radios without analog prefiltering. |
| CMOS-compatible 3.3 V digital outputs | Direct interfacing to Xilinx Virtex or Intel Stratix FPGA I/O banks without level translators or bus buffers. |
| 52-lead LQFP surface-mount package | Enables compact RF module integration with standard reflow assembly and thermal vias under exposed pad (if present). |
Applications
| CDMA/WCDMA Base Station IF Sampling | Antenna Array Digital Beamforming |
|---|---|
Use Scenario: Digitizing 10–20 MHz IF signals from multi-carrier CDMA/WCDMA transceivers prior to digital downconversion and channelization. IC Role / Device Role / Timing Role: High-linearity ADC capturing wide instantaneous bandwidth with minimal harmonic distortion and spurious content. Use Value: 100 dB two-tone SFDR prevents intermodulation masking of adjacent channels; 250 MHz input bandwidth supports direct IF sampling without image-reject filtering. |
Use Scenario: Synchronizing digitized signals across 8–32 antenna elements for real-time phase alignment and beam steering in phased-array radar or 5G mMIMO systems. IC Role / Device Role / Timing Role: Low-jitter, deterministic-latency ADC enabling precise time-of-arrival measurement across distributed channels. Use Value: 0.2 ps rms aperture jitter ensures sub-degree phase coherence across array elements at 2 GHz carrier frequencies. |
| Radar Pulse Compression Receiver | Communications Test Instrumentation |
Use Scenario: Capturing wideband linear FM (chirp) pulses in pulsed radar receivers for matched filtering and target resolution. IC Role / Device Role / Timing Role: High-SFDR ADC preserving pulse fidelity and suppressing range sidelobes during digital pulse compression. Use Value: 74.5 dB SNR at 2.2 MHz and 100 dB SFDR minimize noise floor elevation and spurious artifacts that degrade range resolution. |
Use Scenario: Signal acquisition stage in vector signal analyzers and base station test sets requiring accurate modulation error ratio (MER) and EVM measurements. IC Role / Device Role / Timing Role: Reference-grade ADC serving as digitization engine for calibrated RF signal analysis up to 250 MHz. Use Value: Guaranteed 14-bit no-missing-codes performance and ±0.5 LSB INL ensure traceable amplitude accuracy for compliance testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD6644ASTZ-65 | Same architecture and pinout; guaranteed 65 MSPS sample rate; higher power (1.5 W) and tighter encode timing requirements. | Required for Nyquist zones >20 MHz or oversampling ratios >2× in WCDMA receivers. | Select AD6644ASTZ-65 when system-level timing budget permits faster encode rates and thermal design accommodates +0.2 W dissipation. |
| AD6645ASTZ | 14-bit, 80 MSPS; different architecture (interleaved pipeline); 64-lead LQFP; no integrated reference; requires external REF. | Used where higher sample rate justifies added complexity of external reference and clock distribution. | Choose AD6645ASTZ only if 80 MSPS is mandatory and board space allows external 2.4 V reference and additional decoupling. |
Compared with AD6644ASTZ-65, the AD6644ASTZ-40 offers lower power and relaxed timing margins at the cost of reduced Nyquist bandwidth; compared with AD6645ASTZ, it trades sample rate for integration and ease of use in fixed-rate IF sampling systems.
Availability
AD6644ASTZ-40 is available at Aetrix Electronics and suitable for multichannel receivers, antenna array processing, and communications instrumentation requiring stable component supply across extended production lifecycles.
Supply support for AD6644ASTZ-40 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 AD6644 belongs to Analog Devices' SoftCell® transceiver chipset family, designed specifically for multichannel, multimode digital receivers requiring high SFDR, low jitter, and integrated analog front-end functionality.
FAQ
What is the guaranteed maximum sample rate for AD6644ASTZ-40?
The AD6644ASTZ-40 is guaranteed to operate at 40 MSPS across its full temperature range (−25°C to +85°C). This is distinct from the AD6644ASTZ-65 variant, which guarantees 65 MSPS. Sample rate is determined by the differential ENCODE/ENCODE clock frequency, and timing parameters such as tENC (25 ns) and tENCH (≥10 ns) are specified for 40 MSPS operation in the datasheet Rev. D.
Does AD6644ASTZ-40 include an internal voltage reference?
Yes, the AD6644ASTZ-40 integrates a precision 2.4 V internal reference (VREF pin), which is buffered and available for external use. Pins C1 and C2 require 0.1 µF microwave capacitors to ground for stability. No external reference is needed for basic operation, distinguishing it from later-generation ADCs like the AD6645 that require external reference circuitry.
What package type and lead count does AD6644ASTZ-40 use?
The AD6644ASTZ-40 is packaged in a 52-lead plastic low-profile quad flat package (LQFP), with exposed thermal pad option not indicated in the datasheet. Pin 1 identifier is marked, and the package is RoHS-compliant. Thermal resistance is θJA = 33°C/W on a 6-layer PCB with solid ground plane, per datasheet Rev. D Table 7.
How is the digital output formatted on AD6644ASTZ-40?
The AD6644ASTZ-40 outputs 14-bit parallel data in twos-complement format, with D0 as LSB and D13 as MSB. Outputs are CMOS-compatible and driven from a 3.3 V DVCC supply. The DRY (Data Ready) signal is an inverted, delayed version of ENCODE and serves as a strobe for latching valid data; OVR indicates overrange condition.
Can AD6644ASTZ-40 be used with single-ended encode clocks?
No - the AD6644ASTZ-40 requires differential encode signaling on ENCODE/ENCODE pins for specified AC performance. The functional block diagram and switching specifications assume differential drive. Single-ended clocks introduce common-mode noise and degrade SFDR and SNR; transformer or AC-coupled differential clock generation is mandatory per the "Applying the AD6644" section of the datasheet.
AD6644ASTZ-40 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 52-LQFP
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 65M
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Pipelined
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 3V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -25°C ~ 85°C
- Supplier Device Package:
- 52-LQFP (10x10)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD6644ASTZ-40 FAQ
1.How can I place an order for AD6644ASTZ-40 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD6644ASTZ-40 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 AD6644ASTZ-40 reliable?
The price and inventory of AD6644ASTZ-40 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD6644ASTZ-40 is usually 5 days.
3.What payment methods are accepted for AD6644ASTZ-40?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD6644ASTZ-40 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD6644ASTZ-40?
AD6644ASTZ-40 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD6644ASTZ-40 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 AD6644ASTZ-40?
For technical support, including AD6644ASTZ-40 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD6644ASTZ-40 requirements.
6.How does Aetrix verify that AD6644ASTZ-40 is sourced from the original manufacturer or authorized distributors?
All AD6644ASTZ-40 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 AD6644ASTZ-40 meets industry standards.
7.What is the process for return or replacement of AD6644ASTZ-40?
All AD6644ASTZ-40 units undergo pre-shipment inspection (PSI). If there is an issue with AD6644ASTZ-40, 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 AD6644ASTZ-40 part is unused and in its original packaging.
Return procedure for AD6644ASTZ-40:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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