Overview
The AD6644ASTZ-40, produced by Analog Devices Inc., is a high-speed, high-performance 14-bit analog-to-digital converter (ADC) designed for multichannel, multimode receivers. It is part of the Analog Devices SoftCell® transceiver chipset and integrates all necessary functions, including track-and-hold (TH) and reference, on a single chip. This ADC is built on Analog Devices' high-speed complementary bipolar process (XFCB) and utilizes an innovative multipass circuit architecture. The AD6644ASTZ-40 is packaged in a 52-lead plastic low profile quad flat package (LQFP) and operates over a temperature range of –25°C to +85°C.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Maximum Conversion Rate | 40 | - | 65 | MSPS |
| Minimum Conversion Rate | 15 | - | 15 | MSPS |
| ENCODE Pulse Width High | 10 | 6.5 | - | ns |
| ENCODE Pulse Width Low | 10 | 6.5 | - | ns |
| Encode Period @ 65 MSPS | - | 15.4 | - | ns |
| Encode Period @ 40 MSPS | - | 25 | - | ns |
| Analog Input | - | Differential | - | - |
| Digital Output Format | - | Twos Complement | - | - |
| Power Supply | - | AVCC = 5 V, DVCC = 3.3 V | - | - |
| Power Dissipation | - | 1.3 W | - | - |
Key Features
- High-speed, 14-bit analog-to-digital conversion with guaranteed sample rates of up to 65 MSPS.
- Fully differential analog input stage for improved noise rejection and signal integrity.
- CMOS-compatible digital outputs, allowing easy interface to digital ASICs with a 3.3 V supply.
- Complete conversion solution including on-chip reference and track-and-hold functions.
- Exceptional noise performance with a typical signal-to-noise ratio of 74 dB and 100 dB multitone SFDR through the Nyquist band.
- Compact packaging in a 52-lead plastic low profile quad flat package (LQFP).
Applications
- Multichannel, multimode receivers for various wireless standards such as AMPS, IS-136, CDMA, GSM, and WCDMA.
- Single channel digital receivers in wide-channel bandwidth systems.
- Antenna array processing and communications instrumentation.
- Radar and infrared imaging systems.
- General instrumentation where high-speed, high-accuracy ADCs are required.
Q & A
- What is the maximum conversion rate of the AD6644ASTZ-40?
The maximum conversion rate of the AD6644ASTZ-40 is 65 MSPS. - What type of analog input does the AD6644ASTZ-40 use?
The AD6644ASTZ-40 uses a fully differential analog input stage. - What is the typical signal-to-noise ratio (SNR) of the AD6644ASTZ-40?
The typical signal-to-noise ratio (SNR) of the AD6644ASTZ-40 is 74 dB. - What is the power dissipation of the AD6644ASTZ-40?
The power dissipation of the AD6644ASTZ-40 is 1.3 W. - What are the operating temperature ranges for the AD6644ASTZ-40?
The AD6644ASTZ-40 operates over a temperature range of –25°C to +85°C. - What type of packaging is used for the AD6644ASTZ-40?
The AD6644ASTZ-40 is packaged in a 52-lead plastic low profile quad flat package (LQFP). - What are some common applications of the AD6644ASTZ-40?
Common applications include multichannel, multimode receivers, single channel digital receivers, antenna array processing, communications instrumentation, and radar/infrared imaging systems. - What is the digital output format of the AD6644ASTZ-40?
The digital output format of the AD6644ASTZ-40 is twos complement. - Is the AD6644ASTZ-40 compatible with CMOS digital ASICs?
Yes, the AD6644ASTZ-40 is CMOS-compatible with digital outputs that can be run on a 3.3 V supply. - What is the significance of the 100 dB multitone SFDR in the AD6644ASTZ-40?
The 100 dB multitone SFDR through the Nyquist band indicates exceptional performance in terms of spurious-free dynamic range, which is crucial for multimode digital receivers.
