onsemi NE570DR2G

Overview

NE570DR2G from onsemi is a dual-channel analog compandor IC designed for dynamic range compression and expansion in audio signal paths. It integrates two independent full-wave rectifiers, temperature-compensated variable gain cells, and operational amplifiers per channel, with 110 dB dynamic range, ±20 mA output drive, and operation from 6.0 V to 24 V DC. It is used in cellular radio transceivers, telephone trunk companding, and satellite audio receive systems.

For engineers reviewing the NE570DR2G datasheet, pinout, applications, or equivalent options, key selection criteria include its dual-channel compandor architecture, THD trim capability (0.05% typical trimmed), ±0.2 dB tracking error over temperature, and SOIC-16 WB package compatibility with legacy NE570 designs.

Technical Context

The NE570DR2G implements a dual-channel analog compandor using full-wave averaging rectifiers that generate gain control currents proportional to input signal amplitude. Each channel's linearized, temperature-compensated transconductance multiplier provides distortion-free gain control with internal 1.8 V bandgap reference biasing.

Its op amp stage features internally compensated 1 MHz bandwidth, ±20 mA output current, and DC bias set via external R3/R4 networks. Gain response speed is externally adjustable via rectifier filter capacitors (CRECT pins), enabling trade-offs between attack/decay time and harmonic distortion.

Key Specifications

Pinout & Package

NE570DR2G is housed in a Pb-free SOIC-16 WB (Case 751G) package, 7.5 mm body width, with standard 1.27 mm pitch and exposed pad not present. Pin numbering follows top-view convention with Pin 1 at bottom-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog compandor applications.

Compared with NE570DR2, the NE570DR2G offers identical performance in a RoHS-compliant package; compared with LM13700N, it eliminates 12 discrete components and achieves 0.05% THD without manual trimming - reducing design cycle time by ~3 weeks.

Availability

NE570DR2G is available at Aetrix Electronics and suitable for cellular radio transceivers, telephone trunk compandors, and satellite audio receivers requiring stable component supply across multi-year production cycles.

Supply support for NE570DR2G 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, and communications markets.

The NE570DR2G belongs to onsemi's legacy analog signal conditioning product line, engineered specifically for telecom-grade companding in voice-band audio systems operating from 6 V to 24 V.

FAQ

What is the maximum supply voltage rating for the NE570DR2G?

The NE570DR2G has a maximum operating voltage of 24 VDC, as specified in its Absolute Maximum Ratings table. Operation beyond this voltage risks permanent damage to the internal bandgap reference, rectifier transistors, and op amp stages. For reliable long-term use, design margins should maintain VCC ≤ 22 V under worst-case ripple and transient conditions. The NE570DR2G functions correctly down to 6.0 VDC, making it compatible with both 12 V and 15 V legacy telecom supplies.

Does the NE570DR2G support dual-channel independent operation?

Yes, the NE570DR2G integrates two fully independent compandor channels - Channel 1 (Pins 1–8) and Channel 2 (Pins 9–16) - with separate rectifier inputs, gain cell inputs, THD trim terminals, and outputs. No shared signal paths exist between channels except for common VCC and GND. This allows simultaneous compression on one channel and expansion on the other, as required in full-duplex cellular radio architectures. Channel separation exceeds 60 dB, preventing crosstalk in sensitive audio applications.

How is THD trimmed on the NE570DR2G?

THD trimming on the NE570DR2G is performed per channel using the dedicated THD_TRIM_1 (Pin 8) and THD_TRIM_2 (Pin 9) terminals. A simple external network - typically a 20 kΩ potentiometer referenced to VCC and grounded, with ~200 pF bypass - injects a nulling current to cancel internal offset voltages causing second-harmonic distortion. When properly adjusted, this reduces THD from 0.3% untrimmed to 0.05% typical at 0 dBm. The NE570DR2G datasheet Figure 14 provides the exact schematic and procedure for achieving minimum distortion.

What is the purpose of the RECT_CAP pins on the NE570DR2G?

The RECT_CAP_1 (Pin 1) and RECT_CAP_2 (Pin 16) pins connect external capacitors that form the averaging filter for each channel's full-wave rectifier. These capacitors determine the time constant governing gain response speed: smaller values (e.g., 1 nF) yield fast attack/decay for transient-heavy signals like speech, while larger values (e.g., 100 nF) provide smoother gain control for music. The NE570DR2G's rectifier accuracy remains within ±0.2 dB across 0°C to +70°C regardless of CRECT value, enabling predictable dynamic behavior without recalibration.

Is the NE570DR2G pin-compatible with earlier NE570 variants?

Yes, the NE570DR2G is fully pin-compatible with NE570D, NE570DG, and NE570DR2 in the SOIC-16 WB package (Case 751G). All share identical pinout, electrical specifications, thermal characteristics (R_JA = 105°C/W), and mechanical dimensions. The "G" suffix denotes Pb-free terminations only - no functional or layout changes were made. Customers can migrate existing designs to NE570DR2G without PCB revision, provided solder profile adjustments accommodate lead-free reflow requirements.