ADG419BRZ: Technical Guide to Analog Devices' Precision SPDT Analog Switch

Introduction

The ADG419BRZ is a precision single-pole double-throw (SPDT) analog switch manufactured by Analog Devices, featuring low on-resistance (4Ω typical), fast switching speed (85ns), and wide signal range (±15V) in SOIC-8 package, designed for signal routing, multiplexing, and precision measurement applications requiring high performance and reliability.

This CMOS analog switch provides break-before-make switching action to prevent signal short-circuits during transitions, operates from single (+5V to +36V) or dual (±5V to ±18V) supplies, and offers low leakage current (<1nA) with excellent signal integrity for audio, instrumentation, data acquisition, and automatic test equipment applications.

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Technical Overview

Core Specifications

Parameter	Specification
Configuration	SPDT (1-pole, 2-throw)
On-Resistance (Ron)	4Ω typical, 7Ω max
Switching Time	85ns (ton), 50ns (toff)
Signal Range	±15V (dual supply)
Supply Voltage	5V to 36V (single), ±5V to ±18V (dual)
Leakage Current	<1nA typical
Package	SOIC-8
Operating Temp	-40°C to +85°C

Part Number Decoder

ADG419BRZ:

• ADG = Analog Devices analog switch family
• 419 = SPDT model designation
• B = Specification grade
• R = SOIC package
• Z = Tape-and-reel packaging

Key Features

Low On-Resistance:

• 4Ω typical Ron
• Minimal signal attenuation
• Low power dissipation
• Suitable for precision applications

Fast Switching:

• 85ns turn-on time
• 50ns turn-off time
• Enables high-speed multiplexing
• Minimal signal distortion

Break-Before-Make:

• Prevents momentary shorts
• Critical for signal integrity
• Protects sensitive circuits
• Reliable switching action

Wide Supply Range:

• Single supply: +5V to +36V
• Dual supply: ±5V to ±18V
• Flexible power options
• Compatible with various systems

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Complete Specifications

Switching Characteristics

Parameter	Typical	Maximum	Unit
On-Resistance (Ron)	4	7	Ω
Ron Flatness	0.5	-	Ω
Ron Match	0.2	-	Ω
Turn-On Time (ton)	85	-	ns
Turn-Off Time (toff)	50	-	ns
Break-Before-Make Delay	10	-	ns

Signal Specifications

Parameter	Value
Analog Signal Range (VS = ±15V)	±15V
Analog Signal Range (VS = +15V)	0V to +15V
Off Leakage Current	<1nA
On Leakage Current	<1nA

Digital Interface

Parameter	Value
Logic Input High (VIH)	2.0V min
Logic Input Low (VIL)	0.8V max
Input Capacitance	5pF typical

Power Specifications

Parameter	Typical	Maximum	Unit
Supply Voltage (Single)	-	+36V	V
Supply Voltage (Dual)	-	±18V	V
Supply Current (IS+)	0.01	0.5	μA
Supply Current (IS-)	0.01	0.5	μA

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Pin Configuration

SOIC-8 Package:

Top View:

    IN    1 ●─────● 8  VDD
          │       │
    D     2 ●     │
          │       │
    VSS   3 ●     │
          │       │
    S     4 ●─────● 5  NC
          │       │
    NC    6,7 (No Connect)

Pin 1: IN (Logic control input)
Pin 2: D (Drain - common terminal)
Pin 3: VSS (Negative supply or GND)
Pin 4: S (Source - switched terminal A)
Pin 5: NC (No connect)
Pin 6: NC (No connect)
Pin 7: NC (No connect)
Pin 8: VDD (Positive supply)

Note: Actual pinout may vary - consult datasheet

Truth Table:

IN (Logic)	Connection
LOW (0V)	D connected to S (Pin 4)
HIGH (VDD)	D connected to NC pin

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Application Circuits

1. Signal Routing

Audio/Signal Multiplexer:

Signal A ──► S (Pin 4)
             │
             ├── D (Pin 2) ──► Output
             │
Signal B ──► NC

Control ──► IN (Pin 1)

When IN = LOW: Output = Signal A
When IN = HIGH: Output = Signal B

Applications:

• Audio signal switching
• Sensor multiplexing
• Test point selection
• Signal path routing

2. Instrumentation Switching

Precision Measurement:

Reference ──► S
              │
              ├── D ──► ADC Input
              │
DUT Signal ─► NC

Control selects reference or DUT
Minimal Ron ensures measurement accuracy

3. Automatic Gain Control

AGC Circuit:

Input ──┬──► Gain Stage 1 ──► S
        │                     │
        └──► Gain Stage 2 ──► NC
                              │
                              ├── D ──► Output

Digital control selects gain path
Fast switching enables dynamic range adjustment

4. Bidirectional Switching

Bidirectional Communication:

Device A ◄──► D ◄──► S ◄──► Device B
                │
               IN (Control)

Break-before-make prevents bus contention
Low Ron minimizes signal degradation

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Design Guidelines

Power Supply Decoupling

Single Supply (e.g., +15V):

+15V ──┬── 10μF ──┬── 0.1μF ──┬── VDD (Pin 8)
       │          │           │
      GND        GND         GND ── VSS (Pin 3)

Dual Supply (e.g., ±15V):

+15V ──┬── 10μF ──┬── 0.1μF ──┬── VDD (Pin 8)
       │          │           │
      GND        GND    Analog GND
       │                      │
-15V ──┴── 10μF ──┴── 0.1μF ──┴── VSS (Pin 3)

Signal Integrity

Minimize Ron Impact:

• Keep source impedance low
• Account for 4-7Ω in signal path
• For high-impedance sources, buffer before switch

Control Signal:

• Use CMOS/TTL logic levels
• Fast edges minimize switching time
• Pull-up/pull-down if needed for defined state

PCB Layout

Best Practices:

• Keep analog traces short
• Separate digital control from analog signals
• Ground plane under analog paths
• Bypass capacitors close to supply pins

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Comparison and Selection

ADG4xx Family

Part	Config	Ron (typ)	Supply	Speed	Use Case
ADG417	SPST	4Ω	±15V	85ns	Single switch
ADG419BRZ	SPDT	4Ω	±18V	85ns	2-way routing
ADG420	SPDT	25Ω	±15V	50ns	Lower Ron critical

Competitive Alternatives

Manufacturer	Part	Config	Ron	Package
Analog Devices	ADG419BRZ	SPDT	4Ω	SOIC-8
TI	TS5A3159	SPDT	0.6Ω	SOIC-8
Maxim	MAX4644	SPDT	4Ω	SOIC-8
Vishay	DG419	SPDT	4Ω	SOIC-8

ADG419BRZ Advantages:

• Proven reliability (ADI quality)
• Wide supply range
• Low leakage (<1nA)
• Break-before-make guaranteed

Conclusion

The ADG419BRZ delivers precision SPDT analog switching with low 4Ω on-resistance, fast 85ns switching, and wide ±15V signal range in reliable SOIC-8 package. With break-before-make action, low leakage (<1nA), and flexible power supply options, it enables reliable signal routing for instrumentation, audio, data acquisition, and test equipment applications.

Key Advantages:

✅ Low Ron: 4Ω typical minimizes signal loss
✅ Fast Switching: 85ns enables high-speed multiplexing
✅ Break-Before-Make: Prevents signal shorts
✅ Wide Signal Range: ±15V handles diverse signals
✅ Low Power: <0.5μA supply current
✅ Proven Quality: Analog Devices reliability

Designing precision switching systems? Visit AiChipLink.com for technical resources and analog design consultation.

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Written by Jack Elliott from AIChipLink.

 

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