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Analog Devices Inc. AD6644ASTZ-65
- Part No.:
- AD6644ASTZ-65
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 52-LQFP
- Datasheet:
-
AD6644ASTZ-65.pdf
- Description:
- IC ADC 14BIT PIPELINED 52LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,561
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Product details
Overview
AD6644ASTZ-65 from Analog Devices is a monolithic 14-bit, 65 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, and delivers CMOS-compatible 3.3 V digital outputs for direct interfacing to ASICs in wideband receiver front-ends.
For engineers reviewing the AD6644ASTZ-65 datasheet, AD6644ASTZ-65 pinout, AD6644ASTZ-65 application, or AD6644ASTZ-65 equivalent, this page provides verified specifications, validated pin functions, confirmed LQFP-52 package mapping, real-world communication receiver use cases, and two technically documented alternative ADCs for multichannel IF sampling designs.
Technical Context
The AD6644ASTZ-65 implements 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, all coordinated by digital error correction logic. Its differential ENCODE/ENCODE interface requires <300 fs sampling jitter to maintain 14-bit accuracy at 65 MSPS.
It operates with dual supplies: 5 V AVCC for analog circuitry (including internal 2.4 V reference and TH amplifiers) and 3.3 V DVCC for CMOS output drivers. The analog input stage accepts ±0.55 V differential swing around 2.4 V, yielding 2.2 V p-p full-scale range, and features 1 kΩ differential input resistance and 1.5 pF capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 discrete amplitude levels for high-fidelity digitization of wideband IF signals. |
| Sample Rate | 65 MSPS - supports Nyquist sampling of up to 32.5 MHz baseband or undersampling of higher IF bands (e.g., 70–250 MHz). |
| Two-Tone SFDR | 100 dBFS - enables detection of weak signals amid strong interferers in CDMA/WCDMA multimode receivers. |
| SNR @ 2.2 MHz | 74.5 dB - ensures >73 dB effective number of bits (ENOB ≈ 12.1) for clean signal capture in instrumentation and radar IF chains. |
| Analog Input BW | 250 MHz - allows direct digitization of L-band and S-band IF signals without external anti-alias filtering. |
| Power Dissipation | 1.3 W - split as 276 mA @ 5 V (AVCC) and 36 mA @ 3.3 V (DVCC), enabling thermal management on standard 6-layer PCBs. |
| Aperture Jitter | 0.2 ps rms - limits SNR degradation at high input frequencies; critical for maintaining >70 dB SNR above 15 MHz. |
Pinout & Package
AD6644ASTZ-65 is housed in a 52-lead plastic low-profile quad flat package (LQFP), RoHS-compliant, rated for −25°C to +85°C operation. Thermal resistance is θJA = 33°C/W on a 6-layer board with solid ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN / AIN | Differential analog input pair | Accepts ±0.55 V swing centered at 2.4 V; 1 kΩ || 1.5 pF impedance enables transformer or capacitor coupling without external bias. |
| ENCODE / ENCODE | Differential encode clock inputs | Trigger conversion on rising edge; require <300 fs jitter; internally biased-no external termination needed. |
| D0–D13 | Parallel digital output bus | 14-bit twos complement format, CMOS-compatible at 3.3 V DVCC; D0 = LSB, D13 = MSB. |
| 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 range-enables real-time clipping detection in software radios. |
| VREF / C1 / C2 | Reference and compensation nodes | VREF = 2.4 V internal reference; C1/C2 require 0.1 µF microwave capacitors to ground for stability. |
| DMID | Digital output midpoint reference | Provides DVCC/2 ≈ 1.65 V for receiver ASIC input threshold alignment; buffered and low-impedance. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed 65 MSPS sample rate | Validated across −25°C to +85°C; enables deterministic timing in synchronized multimode base stations. |
| On-chip track-and-hold + reference | Eliminates need for external TH or precision voltage reference ICs-reducing BOM count and layout area. |
| Differential analog & encode interfaces | Rejects common-mode noise on PCB traces and improves jitter immunity versus single-ended clocking. |
| CMOS-compatible 3.3 V outputs | Directly interfaces to FPGA I/O banks or ASIC digital cores without level-shifting circuitry. |
| Pin compatibility with AD6645 | Enables drop-in upgrade path to higher-performance ADCs within same PCB footprint and routing. |
Applications
| CDMA/WCDMA Base Station IF Sampling | Antenna Array Digital Beamforming |
|---|---|
Use Scenario: Digitizing 20–30 MHz IF signals from multiple RF front-ends in a macrocell BTS with simultaneous AMPS/IS-136/CDMA/WCDMA support. IC Role / Device Role / Timing Role: Primary IF ADC capturing wide instantaneous bandwidth for real-time channelization and demodulation in SoftCell® transceiver chipset. Use Value: 100 dB two-tone SFDR prevents intermodulation masking of adjacent channels; 65 MSPS enables oversampling to relax analog filter requirements. |
Use Scenario: Coherent sampling of phase-aligned signals across 8–32 antenna elements in phased-array radar or 5G mmWave test equipment. IC Role / Device Role / Timing Role: Synchronized ADC per RF chain providing time-aligned 14-bit samples for real-time FFT-based beam steering computation. Use Value: 250 MHz analog bandwidth supports direct digitization of X-band IF; low aperture jitter preserves phase coherence across channels. |
| Radar Pulse Detection System | Communications Signal Analyzer |
Use Scenario: Capturing short-duration, high-dynamic-range radar pulses (e.g., pulsed Doppler) in electronic warfare receivers. IC Role / Device Role / Timing Role: High-SFDR ADC front-end feeding FPGA-based pulse compression and CFAR processing. Use Value: 100 dB SFDR resolves weak return echoes near strong clutter; overrange (OVR) flag flags pulse saturation for adaptive gain control. |
Use Scenario: Real-time spectrum analysis of modulated carriers (GSM, LTE) in benchtop instrumentation with >10 MHz instantaneous bandwidth. IC Role / Device Role / Timing Role: Wideband digitizer core enabling 1M-point FFTs with minimal spectral leakage due to high linearity. Use Value: 74.5 dB SNR and ±0.5 LSB INL ensure accurate EVM and ACLR measurements; DRY strobe simplifies data capture synchronization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed IF sampling applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD6645ASTZ-80 | 14-bit, 80 MSPS; improved SFDR (103 dB); higher power (1.9 W); same LQFP-52 pinout. | Supports wider IF bandwidths (up to 40 MHz Nyquist) and tighter adjacent-channel rejection in next-gen 4G/LTE systems. | Select when >65 MSPS throughput or >100 dB SFDR is required; verify thermal margin for 1.9 W dissipation. |
| ADS5463IPFP | 13-bit, 500 MSPS; 64-pin HTQFP; 1.8 V/3.3 V supplies; 69 dB SNR @ 100 MHz input. | Targets direct RF sampling (DC–250 MHz) rather than IF sampling; requires external reference and TH. | Choose for ultra-wideband direct-conversion architectures; not pin-compatible-requires new layout and driver design. |
Compared with AD6645ASTZ-80, AD6644ASTZ-65 offers lower power and proven thermal behavior in dense base station modules; compared with ADS5463IPFP, it provides integrated reference/TH and superior SFDR at IF frequencies, reducing system complexity for multimode receiver designs.
Availability
AD6644ASTZ-65 is available at Aetrix Electronics and suitable for CDMA/WCDMA infrastructure, radar signal acquisition, and communications test equipment requiring stable component supply across extended product lifecycles.
Supply support for AD6644ASTZ-65 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, with R&D focused on precision data conversion and RF integration.
The AD6644 belongs to Analog Devices' SoftCell® transceiver chipset family, engineered specifically for multichannel, multimode wireless infrastructure receivers where dynamic range, sampling fidelity, and integration density are critical.
FAQ
What is the guaranteed maximum sample rate for AD6644ASTZ-65?
The AD6644ASTZ-65 is guaranteed to operate at 65 MSPS across its full temperature range (−25°C to +85°C). This is explicitly specified in Table 3 of the Rev. D datasheet under "Maximum Conversion Rate" for the AD6644AST-65 variant. Performance metrics including SFDR and SNR are validated at this rate.
Does AD6644ASTZ-65 include an internal voltage reference?
Yes, AD6644ASTZ-65 integrates a 2.4 V internal reference (VREF), as confirmed in the General Description and Pin Function Descriptions (Pin 3). It requires a 0.1 µF microwave capacitor to ground for stability, and drives internal circuitry including the analog input stage and track-and-hold amplifiers.
What package type and lead count does AD6644ASTZ-65 use?
AD6644ASTZ-65 uses a 52-lead plastic low-profile quad flat package (LQFP), as stated in the General Description and verified in the Pin Configuration diagram (Figure 3) and Thermal Resistance table (θJA = 33°C/W for 52-lead LQFP).
Is AD6644ASTZ-65 pin-compatible with any other Analog Devices ADCs?
Yes, AD6644ASTZ-65 is pin-compatible with the AD6645, as highlighted in the FEATURES section ("Pin compatible to AD6645") and confirmed in the Product Highlights. This enables hardware reuse and migration paths within the same LQFP-52 footprint.
What digital output format does AD6644ASTZ-65 use?
AD6644ASTZ-65 outputs data in twos complement format, as specified in both the FEATURES list and Table 2 (Digital Specifications). The 14-bit parallel bus (D0–D13) delivers signed integer values directly usable by DSPs and FPGAs without format conversion.
AD6644ASTZ-65 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 52-LQFP
- Packaging:
- Tray
- 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-65 FAQ
1.How can I place an order for AD6644ASTZ-65 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD6644ASTZ-65 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-65 reliable?
The price and inventory of AD6644ASTZ-65 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD6644ASTZ-65 is usually 5 days.
3.What payment methods are accepted for AD6644ASTZ-65?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD6644ASTZ-65 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD6644ASTZ-65?
AD6644ASTZ-65 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD6644ASTZ-65 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-65?
For technical support, including AD6644ASTZ-65 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD6644ASTZ-65 requirements.
6.How does Aetrix verify that AD6644ASTZ-65 is sourced from the original manufacturer or authorized distributors?
All AD6644ASTZ-65 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-65 meets industry standards.
7.What is the process for return or replacement of AD6644ASTZ-65?
All AD6644ASTZ-65 units undergo pre-shipment inspection (PSI). If there is an issue with AD6644ASTZ-65, 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-65 part is unused and in its original packaging.
Return procedure for AD6644ASTZ-65:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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