Analog Devices Inc. AD9742ACPRL7

Overview

AD9742ACPRL7 from Analog Devices is a 12-bit, 210 MSPS current-output digital-to-analog converter optimized for wideband transmit signal paths in communication systems. It delivers 70 dB SNR at 5 MHz output with 2–20 mA programmable full-scale current, on-chip 1.2 V band gap reference, and CMOS-compatible 3.3 V digital interface - deployed in base station IF upconversion and direct digital synthesis.

For engineers reviewing the AD9742ACPRL7 datasheet, AD9742ACPRL7 pinout, AD9742ACPRL7 application, or AD9742ACPRL7 equivalent, this page provides verified specifications, package mapping to 32-lead LFCSP, functional role in differential current output generation, and validated alternative options for high-speed DAC selection.

Technical Context

The AD9742ACPRL7 implements a segmented PMOS current source architecture: 31 equal-current sources for DB11–DB3 (MSBs), 15 scaled sources for DB2–DB0 (middle bits), and binary-weighted LSB switches - minimizing glitch impulse (5 pV·s) and enhancing SFDR. Its edge-triggered latches support single-ended or differential clocking up to 210 MSPS with 1 ns propagation delay and 11 ns settling time.

Dual-supply operation (AVDD/DVDD/CLKVDD = 2.7–3.6 V) isolates analog and digital domains; internal 1.2 V reference (±50 ppm/°C drift) feeds a reference control amplifier that sets IOUTFS via external RSET on FS ADJ pin. Full-scale current scales linearly from 2 mA to 20 mA, directly impacting SNR (e.g., +8 dB improvement when reduced from 20 mA to 5 mA at 65 MSPS).

Key Specifications

Pinout & Package

AD9742ACPRL7 is packaged in a 32-lead LFCSP (5 mm × 5 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per Analog Devices Rev. C datasheet Figure 4 and Table 6.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed DAC applications.

Compared with AD9742ACPRL7, AD9744ACPZ offers higher resolution at identical speed and package, while AD9767ASTZ trades speed and integration for legacy SOIC compatibility - making AD9742ACPRL7 optimal for new 12-bit, space-constrained, low-power IF DAC designs.

Availability

AD9742ACPRL7 is available at Aetrix Electronics and suitable for base station transmitters, direct digital synthesis equipment, wireless local loop infrastructure, and digital radio links requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD9742ACPRL7 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 AD9742ACPRL7 belongs to the TxDAC family of transmit-optimized DACs - designed specifically for high-SFDR, low-power IF and RF signal generation in wireless infrastructure and instrumentation.

FAQ

What is the maximum clock frequency supported by the AD9742ACPRL7?

The AD9742ACPRL7 supports a maximum update rate of 210 MSPS, verified in the Rev. C datasheet Table 2. This applies to both single-ended (CLOCK pin) and differential (CLK+/CLK−) clock configurations. At 210 MSPS, SFDR remains 67 dBc at 40 MHz output and 60 dBc at 69 MHz output - confirming real-time capability for wideband IF synthesis. The AD9742ACPRL7 achieves this using edge-triggered latches with 1 ns propagation delay and robust clock domain isolation.

Does the AD9742ACPRL7 include an internal voltage reference?

Yes, the AD9742ACPRL7 integrates a 1.2 V temperature-compensated band gap reference with ±50 ppm/°C drift and 1.14–1.26 V output range. When REFLO is tied to ACOM, REFIO becomes a 1.2 V output requiring a 0.1 µF decoupling capacitor. The reference drives the internal reference control amplifier, which sets full-scale current via FS ADJ. Disabling the internal reference (by tying REFLO to AVDD) allows use of an external precision reference without performance penalty.

How is the full-scale output current adjusted on the AD9742ACPRL7?

The AD9742ACPRL7 full-scale current (IOUTFS) is set from 2 mA to 20 mA using an external resistor (RSET) connected to the FS ADJ pin. The internal reference control amplifier generates IREF = VREFIO / RSET, and IOUTFS = 32 × IREF. For example, a 60 kΩ RSET yields IREF = 20 µA → IOUTFS = 640 µA (below spec min); a 6 kΩ RSET gives IREF = 200 µA → IOUTFS = 6.4 mA. Datasheet Table 1 confirms nominal 20 mA operation with appropriate RSET value.

What package type is used for the AD9742ACPRL7?

The AD9742ACPRL7 uses a 32-lead LFCSP package (5 mm × 5 mm, 0.5 mm pitch) with exposed thermal pad, as confirmed in the Rev. C datasheet Ordering Guide and Figure 4. This differs from SOIC/TSSOP variants (e.g., AD9742ARUZ). The LFCSP variant provides superior thermal resistance (θJA = 32.5 °C/W) and high-frequency performance due to shorter bond wires and optimized grounding - critical for maintaining SFDR above 70 dBc in RF applications.

Can the AD9742ACPRL7 operate with different digital input data formats?

Yes, the AD9742ACPRL7 supports both straight binary and twos complement data formats, selected via the MODE pin. Tie MODE to DCOM for straight binary (0x000 = 0 mA, 0xFFF = full scale); tie MODE to DVDD for twos complement (0x800 = 0 mA, 0xFFF = negative full scale, 0x7FF = positive full scale). This flexibility simplifies interface with FPGAs or DSPs using either representation, without requiring external logic translation. Input setup/hold times (2.0 ns / 1.5 ns) are specified for both modes.