Analog Devices Inc. ADA4922-1ACPZ-RL

Overview

ADA4922-1ACPZ-RL from Analog Devices is a high-voltage, fixed-gain (G = 2) single-ended-to-differential ADC driver optimized for 16-bit to 18-bit precision data acquisition. It delivers 40 V p-p differential output swing on ±12 V supplies, −99 dBc HD2/HD3 at 100 kHz, and 12 nV/√Hz differential output noise - enabling high-SNR signal conditioning in industrial instrumentation and spectrum analysis systems.

For engineers reviewing the ADA4922-1ACPZ-RL datasheet, ADA4922-1ACPZ-RL pinout, ADA4922-1ACPZ-RL application, or ADA4922-1ACPZ-RL equivalent, key selection criteria include its 7.2 MHz large-signal bandwidth at 40 V p-p, 580 ns 0.01% settling time, disable feature with 78 ns turn-on, and LFCSP package thermal performance (θJC = 17°C/W).

Technical Context

The ADA4922-1ACPZ-RL integrates dual matched amplifiers with internal 600 Ω feedback resistors to achieve precise G = 2 differential gain without external components. Its H-bridge input stage and rail-to-rail output architecture support wide common-mode input range (±10.7 V on ±12 V) and high output current (±40 mA), enabling direct drive of high-input-impedance ADCs.

Operation relies on REF pin biasing to match input midswing level - critical for minimizing differential offset. The DIS pin enables active-low power-down (1.5–2.0 mA quiescent current), while internal feedback network power dissipation must be included in thermal design due to up to 135 mW per resistor under DC load conditions.

Key Specifications

Pinout & Package

ADA4922-1ACPZ-RL is housed in an 8-lead, 3 mm × 3 mm LFCSP with exposed paddle for enhanced thermal performance (θJC = 17°C/W). The package is RoHS-compliant and rated for −40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage differential ADC driver applications.

Compared with ADA4927-1ACPZ-R7 and THS4561IRGET, the ADA4922-1ACPZ-RL uniquely balances high-voltage output (40 V p-p), ultra-low distortion (−99 dBc), and precision gain (0.05% error) - making it the only option qualified for 18-bit industrial DAQ where both amplitude headroom and spectral fidelity are mandatory.

Availability

ADA4922-1ACPZ-RL is available at Aetrix Electronics and suitable for high-voltage data acquisition systems, industrial process monitoring, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADA4922-1ACPZ-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 ADA4922-1ACPZ-RL belongs to Analog Devices' precision high-voltage amplifier product line, engineered specifically to simplify and improve the accuracy of differential ADC driving in industrial, instrumentation, and test equipment applications.

FAQ

What is the maximum differential output voltage swing supported by the ADA4922-1ACPZ-RL?

The ADA4922-1ACPZ-RL delivers up to 40 V p-p differential output swing when operated on ±12 V supplies, with each single-ended output swinging ±10.65 V into 1 kΩ. This enables direct interfacing to ADCs with ±20 V input ranges without external attenuation or level-shifting circuitry, preserving full dynamic range and SNR.

Does the ADA4922-1ACPZ-RL require external gain-setting components?

No, the ADA4922-1ACPZ-RL features an internal fixed-gain architecture with precisely trimmed 600 Ω feedback resistors, delivering a nominal gain of +2 V/V with only −0.05% gain error. This eliminates external resistors, reduces layout sensitivity, and avoids drift-related inaccuracies common in discrete gain networks - a core design advantage of the ADA4922-1ACPZ-RL.

How does the REF pin function in the ADA4922-1ACPZ-RL, and what happens if it is misconfigured?

The REF pin sets the dc baseline for the inverting output (OUT−) path in the ADA4922-1ACPZ-RL. When tied to the input signal's midswing level (e.g., ground for bipolar signals), it ensures zero differential offset. If misconfigured - such as connecting REF to midsupply while the input swings asymmetrically - a dc offset appears between OUT+ and OUT−, wasting output dynamic range and degrading ADC effective resolution.

What thermal considerations apply to the ADA4922-1ACPZ-RL in its LFCSP package?

The ADA4922-1ACPZ-RL in 3 mm × 3 mm LFCSP has θJC = 17°C/W and requires the exposed paddle to be soldered to a thermally robust PCB copper plane. Internal 600 Ω feedback resistors can dissipate up to 135 mW each under DC load conditions - this power must be included in junction temperature calculations alongside quiescent (10.1 mA) and load-driven dissipation to ensure TJ remains below 150°C.

Can the ADA4922-1ACPZ-RL drive capacitive loads, and what is its stability limit?

Yes, the ADA4922-1ACPZ-RL is specified to drive up to 20 pF capacitive load with ≤30% overshoot. Beyond this, phase margin erodes - verified in Figure 11 and Figure 14 of the datasheet. For heavier loads (e.g., ADC input capacitance + PCB trace), a small series resistor (10–22 Ω) at the output is recommended to maintain stability without compromising bandwidth or settling performance of the ADA4922-1ACPZ-RL.