Analog Devices Inc. ADA4320-1ACPZ-RL

Overview

ADA4320-1ACPZ-RL from Analog Devices is a DOCSIS 3.0 upstream CATV line driver IC optimized for reverse-channel transmission in cable modems and E-MTAs. It delivers programmable gain (−27 dB to +32 dB), ultralow distortion (−66 dBc ACPR for QPSK), 5 V single-supply operation, and current-scaled output stage supporting up to 260 mA at maximum gain. Its 24-lead LFCSP package enables high-density placement in CPE RF front-ends.

For engineers reviewing the ADA4320-1ACPZ-RL datasheet, ADA4320-1ACPZ-RL pinout, ADA4320-1ACPZ-RL application, or ADA4320-1ACPZ-RL equivalent, key selection criteria include its 59 dB programmable gain range, 85 MHz bandwidth with flat response, DOCSIS 3.0-compliant ACPR performance, SPI-controlled current scaling, and 75 Ω single-ended output drive capability via external transformer.

Technical Context

The ADA4320-1ACPZ-RL integrates a differential preamplifier, vernier gain stage, and digitally controlled 6-bit coarse attenuator with current-scaling output driver. Its architecture supports simultaneous gain and current-level programming via an 8-bit SPI-compatible serial word (Bits[7:6] = current level CL3–CL0; Bits[5:0] = gain code 01–60).

It maintains constant 300 Ω differential output impedance across enable/disable/sleep states and achieves >100 dB input-to-output isolation in transmit-disable mode. The device operates over −40°C to +85°C and uses internal compensation with external 0.1 μF capacitor on COMP pin.

Key Specifications

Pinout & Package

ADA4320-1ACPZ-RL is housed in a RoHS-compliant 4 mm × 5 mm 24-lead LFCSP with exposed thermal pad. The package requires soldering of the EPAD to PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar upstream CATV line driver applications.

Compared with MAX11216ETX+T and LMH6554QML-SP, the ADA4320-1ACPZ-RL uniquely integrates DOCSIS 3.0–validated ACPR performance, 59 dB SPI-programmable gain, current-scaling power management, and production-ready 24-lead LFCSP packaging-reducing design risk and time-to-market for cable modem and E-MTA platforms.

Availability

ADA4320-1ACPZ-RL is available at Aetrix Electronics and suitable for DOCSIS 3.0 cable modems, E-MTA lifeline systems, and set-top box reverse-channel amplifiers requiring stable component supply across extended product lifecycles.

Supply support for ADA4320-1ACPZ-RL 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 Wilmington, MA.

The ADA4320-1ACPZ-RL belongs to Analog Devices' CATV line driver product line, engineered specifically for upstream RF signal conditioning in CableLabs®-compliant customer premises equipment with emphasis on DOCSIS 3.0 spectral purity and power efficiency.

FAQ

What is the maximum output power capability of the ADA4320-1ACPZ-RL?

The ADA4320-1ACPZ-RL achieves a 1 dB compression point (P1dB) of 70 dBmV at 10 MHz under maximum gain (Gain Code 60) and current level 3 conditions. This corresponds to approximately +21.8 dBm into a 75 Ω load when referenced to the transformer output, enabling compliance with DOCSIS 3.0 upstream power limits across the full 5–85 MHz band.

How does the ADA4320-1ACPZ-RL implement gain and current control?

The ADA4320-1ACPZ-RL uses an 8-bit SPI-compatible serial interface where Bits[7:6] select one of four current levels (CL3–CL0) and Bits[5:0] set the gain code (01–60). A single 8-bit word updates both parameters simultaneously; the device latches new settings on the rising edge of DATEN after MSB-first clocking on SDATA.

Can the ADA4320-1ACPZ-RL drive a 75 Ω load directly without a transformer?

No-the ADA4320-1ACPZ-RL has a 300 Ω differential output impedance and is specified for driving a 75 Ω single-ended load only through a 4:1 impedance transformer (e.g., Coilcraft PWB-4-BL). Direct connection to 75 Ω would cause severe mismatch, degraded return loss, and compromised ACPR performance.

What is the purpose of the RAMP pin on the ADA4320-1ACPZ-RL?

The RAMP pin (Pin 6) accepts an external capacitor to control the slew rate of output voltage during gain transitions, minimizing transient glitches. While optional, a properly sized capacitor reduces output switching transients to <2 mV_p-p at minimum gain and <20 mV_p-p at maximum gain-critical for meeting DOCSIS 3.0 burst timing masks.

Does the ADA4320-1ACPZ-RL support differential input configuration?

Yes-the ADA4320-1ACPZ-RL accepts true differential input signals with 640 Ω input impedance and requires 180° phase-matched, equal-amplitude inputs. Its functional block diagram confirms balanced preamp and vernier stages; single-ended operation (320 Ω input) is also supported but with reduced common-mode rejection and linearity.