概要

The ADG5208/ADG5209 are monolithic CMOS analog multiplexers comprising eight single channels and four differential channels, respectively. The ADG5208 switches one of eight inputs to a common output, as determined by the 3-bit binary address lines, A0, A1, and A2. The ADG5209 switches one of four differential inputs to a common differential output, as determined by the 2-bit binary address lines, A0 and A1. An EN input on both devices enables or disables the device. When EN is disabled, all channels switch off. The ultralow capacitance and charge injection of these switches make them ideal solutions for data acquisition and sample-and-hold applications, where low glitch and fast settling are required. Fast switching speed coupled with high signal bandwidth make these devices suitable for video signal switching.

Each switch conducts equally well in both directions when on, and each switch has an input signal range that extends to the power supplies. In the off condition, signal levels up to the supplies are blocked.The ADG5208/ADG5209 do not have VL pins; instead, the logic power supply is generated internally by an on-chip voltage generator.

 

特徴

Latch-up proof

2.9 pF off source capacitance

34 pF off drain capacitance

0.2 pC charge injection

Low on resistance: 160 Ω typical

±9 V to ±22 V dual-supply operation

9 V to 40 V single-supply operation

48 V supply maximum ratings

Fully specified at ±15 V, ±20 V, +12 V, and +36 V

VSS to VDD analog signal range

Human body model (HBM) ESD rating

8 kV I/O port to supplies

2 kV I/O port to I/O port

8 kV all other pins

 

アプリケーション

Automatic test equipment

Data acquisition

計装

Avionics

Audio and video switching

Communication systems

 

製品ハイライト

  1. Trench Isolation Guards Against Latch-Up. A dielectric trench separates the P and N channel transistors to prevent latch-up even under severe overvoltage conditions.
  2. 0.2 pC Charge Injection.
  3. Dual-Supply Operation. For applications where the analog signal is bipolar, the ADG5208/ADG5209 can be operated from dual supplies of up to ±22 V.
  4. Single-Supply Operation. For applications where the analog signal is unipolar, the ADG5208/ADG5209 can be operated from a single rail power supply of up to 40 V.
  5. 3 V Logic-Compatible Digital Inputs. VINH = 2.0 V, VINL = 0.8 V.
  6. No VL Logic Power Supply Required.

 

AC Power Supply Rejection Ratio (ACPSRR)

ACPSRR is a measure of the ability of a device to avoid coupling noise and spurious signals that appear on the supply voltage pin to the output of the switch. The dc voltage on the device is modulated by a sine wave of 0.62 V p-p. The ratio of the amplitude of signal on the output to the amplitude of the modulation is the ACPSRR.

 

TRENCH ISOLATION

In the ADG5208/ADG5209, an insulating oxide layer (trench) is placed between the NMOS and the PMOS transistors of each CMOS switch. Parasitic junctions, which occur between the transistors in junction isolated switches, are eliminated, and the result is a completely latch-up proof switch.In junction isolation, the N and P wells of the PMOS and NMOS transistors form a diode that is reverse-biased under normal operation. However, during overvoltage conditions, this diode can become forward-biased. A silicon controlled rectifier (SCR) type circuit is formed by the two transistors, causing a significant amplification of the current that, in turn, leads to latch-up. With trench isolation, this diode is removed, and the result is a latch-up proof switch.

 

アプリケーション情報

The low capacitance latch-up immune family of switches and multiplexers provides a robust solution for instrumentation, industrial, automotive, aerospace, and other harsh environments that are prone to latch-up, which is an undesirable high current state that can lead to device failure and persist until the power supply is turned off. The ADG5208/ADG5209 high voltage switches allow single-supply operation from 9 V to 40 V and dual-supply operation from ±9 V to ±22 V.