Analog Devices Inc. AD6600ASTZ

Overview

AD6600ASTZ from Analog Devices is a dual-channel, gain-ranging 11-bit analog-to-digital converter with integrated RSSI detection, designed for direct IF sampling in 70–250 MHz cellular/PCS receivers. It delivers 20 MSPS single-channel or 10 MSPS per channel in diversity mode, 90+ dB total signal range (30 dB AGC + 60 dB ADC), and CMOS-compatible digital outputs at 3.3 V or 5 V. It is used in GSM, CDMA, and wireless local loop base stations.

For engineers reviewing the AD6600ASTZ datasheet, AD6600ASTZ pinout, AD6600ASTZ application, or AD6600ASTZ equivalent, this page provides verified technical context, real-world timing constraints, confirmed package mapping to 44-lead LQFP, validated dual-channel gain-ranging behavior, and two field-validated alternative parts for diversity receiver designs.

Technical Context

The AD6600ASTZ implements a dual-path analog front end with independent 0 dB/–12 dB/–24 dB step attenuators per channel, followed by a 12 dB/18 dB programmable gain amplifier and a 450 MHz track-and-hold stage. Each channel includes a high-speed synchronous peak detector feeding 3-bit RSSI logic that adjusts attenuation on a clock-by-clock basis to maintain optimal SNR across >90 dB input dynamic range.

Digital output comprises 11-bit two's complement ADC data (D10–D0), 3-bit RSSI word, A/B channel indicator (AB_OUT), and 2× encode clock (CLK2×). All digital signals are CMOS-compatible and support DVCC = 3.3 V or 5 V, with timing referenced to differential ENC/ENC inputs operating up to 20 MSPS.

Key Specifications

Pinout & Package

AD6600ASTZ is housed in a 44-lead Low-Profile Quad Flatpack (LQFP), surface-mount package (ST-44 option), with exposed pad thermal design and industrial temperature rating (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel IF sampling applications.

Compared with AD6600ASTZ, AD6620 serves as a digital companion rather than functional substitute, while AD9218BSTZ-65 trades integrated gain control and dual-channel capability for raw speed and resolution-making it unsuitable for diversity or wide-dynamic-range IF digitization without added circuitry.

Availability

AD6600ASTZ is available at Aetrix Electronics and suitable for cellular base station development, wireless local loop infrastructure, and proprietary air interface receiver designs requiring stable component supply and long-term industrial temperature support.

Supply support for AD6600ASTZ 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, serving communications, industrial, and instrumentation markets since 1965.

The AD6600ASTZ belongs to Analog Devices' high-dynamic-range IF receiver IC product line, engineered specifically for zero-IF and low-IF sampling in cellular/PCS infrastructure where automatic gain control, diversity support, and wideband analog input fidelity are essential.

FAQ

What is the maximum analog input frequency supported by the AD6600ASTZ?

The AD6600ASTZ supports analog input frequencies from 70 MHz to 250 MHz, with full 450 MHz analog input bandwidth enabled by its internal track-and-hold circuit. At 250 MHz, it maintains 2.86 V p-p differential input voltage range and 7.7 dBm full-scale input power, making it suitable for direct IF sampling in modern cellular infrastructure.

Does the AD6600ASTZ require external analog AGC circuitry?

No, the AD6600ASTZ integrates automatic gain-ranging functionality using on-chip 0 dB/–12 dB/–24 dB step attenuators and a 12 dB/18 dB programmable gain amplifier. Its 3-bit RSSI output drives real-time gain adjustments on a per-sample basis, eliminating the need for external analog AGC loops in most IF receiver designs.

Can the AD6600ASTZ operate with a 3.3 V digital supply?

Yes, the AD6600ASTZ supports DVCC = 3.3 V for all digital outputs (D10–D0, RSSI[2:0], AB_OUT, CLK2×), while maintaining full CMOS compatibility and specified timing margins. AVCC must remain at 5 V for analog circuitry, enabling mixed-supply system integration with 3.3 V FPGAs or DSPs.

What is the purpose of the FLT and FLT pins on the AD6600ASTZ?

The FLT and FLT pins form a differential resonant port for connecting an external LC noise filter. This stage shapes the analog signal before the track-and-hold, improving SNR by suppressing out-of-band noise. The port presents 630 Ω differential resistance and 1.75 pF capacitance, defining filter Q and center frequency in conjunction with external components.

How does the AD6600ASTZ handle diversity versus dual-independent signal modes?

The AD6600ASTZ supports both modes: in diversity mode, it alternates sampling between AIN/AIN and BIN/BIN at 10 MSPS per channel with AB_OUT flagging active channel; in dual-independent mode, A_SEL and B_SEL pins configure static channel selection, allowing simultaneous use of both paths with external time-division control logic.