ADGS1212BCPZ datasheet(20/24 Pages) AD

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ADGS1212

Data Sheet

Rev. 0 | Page 20 of 24

APPLICATIONS INFORMATION

BREAK-BEFORE-MAKE SWITCHING

The ADGS1212 exhibits break-before-make switching. This

feature allows the use of the device in multiplexer applications.

Using the device like a multiplexor can be accomplished by

externally hardwiring the device into the desired mux

configuration, as shown in Figure 40.

4 × SPST

SCLK SDI CS RESET/VL

SPI

INTERFACE

4:1 MUX

Figure 40. A SPI Controlled Switch Configured into a 4:1 Mux

POWER SUPPLY RAILS

To guarantee correct operation of the ADGS1212, 0.1 µF

decoupling capacitors are required.

The ADGS1212 can operate with bipolar supplies between

±4.5 V and ±16.5 V. The supplies on VDD and VSS do not have to

be symmetrical; however, the VDD to VSS range must not exceed

33 V. The ADGS1212 can also operate with single supplies

between 5 V and 16.5 V with VSS connected to GND.

The voltage range that can be supplied to VL is from 2.7 V to 5.5 V.

The device is fully specified at ±15 V and +12 V analog supply

voltage ranges.

POWER SUPPLY RECOMMENDATIONS

Analog Devices, Inc., has a wide range of power management

products to meet the requirements of most high performance

signal chains.

An example of a bipolar power solution is shown in Figure 41.

The ADP5070 (dual switching regulator) generates a positive and

negative supply rail for the ADGS1212, amplifier, and/or a

precision converter in a typical signal chain. Also shown in

Figure 41 are two optional low dropout (LDO) regulators

(ADP7118 and ADP7182 positive and negative LDOs

respectively) that can be used to reduce the output ripple of the

ADP5070 in ultralow noise sensitive applications.

The ADM7160 can be used to generate the VL voltage that is

required to power digital circuitry within the ADGS1212.

ADM7160

LDO

+3.3V

ADP7118

LDO

+15V

ADP7182

LDO

–15V

+16.5V

–16.5V

ADP5070

+5V

INPUT

Figure 41. Bipolar Power Solution

Table 9. Recommended Power Management Devices

Product

Description

ADP5070

1 A/0.6 A, dc-to-dc switching regulator with

independent positive and negative outputs

ADM7160

5.5 V, 200 mA, ultralow noise, linear regulator

ADP7118

20 V, 200 mA, low noise, CMOS LDO linear regulator

ADP7182

−28 V, −200 mA, low noise, LDO linear regulator

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