Analog Devices Inc. AD9709ASTRL

Overview

AD9709ASTRL from Analog Devices is a dual-channel, 8-bit, 125 MSPS current-output digital-to-analog converter (DAC) optimized for I/Q signal synthesis in communications systems. It integrates two TxDAC+® cores, on-chip 1.2 V bandgap reference, independent gain control, and dual-port/interleaved digital interface in a 48-lead LQFP package. Key confirmed specs: 66 dBc SFDR @ 5 MHz output, 0.1% gain matching, 20 mA nominal full-scale current per channel, and 380 mW power dissipation at 5 V.

For engineers reviewing the AD9709ASTRL datasheet, AD9709ASTRL pinout, AD9709ASTRL application, or AD9709ASTRL equivalent, this page delivers verified technical context for base station transmitters, quadrature modulators, and high-speed digital synthesis where dual-channel timing coherence, low distortion, and flexible data interfacing are critical selection criteria.

Technical Context

The AD9709ASTRL employs a segmented PMOS current source architecture with proprietary switching to minimize glitch energy and maximize dynamic accuracy. Each DAC features independent double-buffered latches, separate clock (CLK1/IQCLK, CLK2/IQRESET) and write (WRT1/IQWRT, WRT2/IQSEL) inputs, and supports both dual-port operation (independent I/Q streams) and interleaved mode (demuxing single high-speed stream into I/Q).

Full-scale current (IOUTFS) is set via external resistors on FSADJ1/FSADJ2 pins and scaled by internal 32× replication of IREF; GAINCTRL selects master/slave resistor configuration. The analog section uses AVDD (3.3 V or 5 V), while digital sections use DVDD1/DVDD2 (2.7–5.5 V), enabling mixed-supply system integration with >100 kΩ output resistance and ±1.25 V output compliance range.

Key Specifications

Pinout & Package

AD9709ASTRL is housed in a 48-lead LQFP (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per Analog Devices Rev. B datasheet Figure 3 and Table 6.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9717BCPZ and MAX5895ETM+, the AD9709ASTRL delivers optimal trade-off of matching precision, power efficiency, and interface flexibility for 8-bit communications DAC applications-without requiring external reference or complex power sequencing.

Availability

AD9709ASTRL is available at Aetrix Electronics and suitable for base station transmitters, quadrature modulators, and digital synthesis equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD9709ASTRL 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 DSP technologies, serving communications, industrial, and healthcare markets since 1965.

The AD9709ASTRL belongs to the TxDAC+® family of dual transmit DACs designed specifically for I/Q signal generation in wireless infrastructure and instrumentation-emphasizing channel matching, low distortion, and flexible data interfacing.

FAQ

What is the maximum clock frequency supported by the AD9709ASTRL?

The AD9709ASTRL supports a maximum update rate of 125 MSPS per DAC channel, as confirmed in the Dynamic Specifications table (Table 2) of the Rev. B datasheet. This applies to both CLK1/IQCLK and CLK2/IQRESET inputs under standard operating conditions (AVDD = 3.3 V or 5 V, IOUTFS = 20 mA). Operation beyond 125 MSPS is not characterized and may degrade SFDR or cause timing violations.

Does the AD9709ASTRL require an external reference voltage?

No, the AD9709ASTRL includes an on-chip 1.20 V temperature-compensated bandgap reference accessible at the REFIO pin. A 0.1 µF capacitor to ACOM suffices for internal reference use. An external reference can be applied to REFIO if improved accuracy or drift performance is needed, but it is not required for basic operation of the AD9709ASTRL.

How is full-scale current configured on the AD9709ASTRL?

Full-scale current (IOUTFS) on the AD9709ASTRL is set via external resistors connected to FSADJ1 and FSADJ2 pins, with scaling determined by internal 32× replication of IREF. GAINCTRL pin selects independent resistor control (high) or shared resistor (low). Nominal IOUTFS is 20 mA, adjustable down to 2 mA, as specified in Table 1 DC Specifications.

What package type and lead count does the AD9709ASTRL use?

The AD9709ASTRL uses a 48-lead LQFP package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad, as documented in the Outline Dimensions section (Page 32) and Pin Configuration diagram (Figure 3) of the Rev. B datasheet. This package is RoHS-compliant and compatible with standard surface-mount assembly processes.

Can the AD9709ASTRL operate from a single 3.3 V supply?

Yes, the AD9709ASTRL supports single-supply operation at either 3.3 V or 5 V on AVDD, DVDD1, and DVDD2, as stated in the General Description and Power Supply specifications (Table 1). At 3.3 V, analog supply current is 71–75 mA and digital supply current is 5–7 mA, resulting in total power dissipation below 300 mW - verified in the Power Dissipation section (Page 3).