ADG4612BCPZ-REEL7 Datasheet ADG4612BCPZ-REEL7, ADG4613BRUZ, ADG4613BCPZ-REEL7 | P16-P18

ADG4612/ADG4613

Rev. 0 | Page 16 of 24

TERMINOLOGY

represents the positive supply current.

represents the negative supply current.

, V

and V

represent the analog voltage on Terminal D and

Ter minal S, res p ectively.

represents the ohmic resistance between Terminal D and

Ter minal S.

ΔR

represents the difference between the R

of any two

channels.

FLAT (ON)

Flatness that is defined as the difference between the maximum

and minimum value of on resistance measured over the specified

analog signal range is represented by R

FLAT (ON)

(Off)

(Off) is the source leakage current with the switch off.

(Off)

(Off) is the drain leakage current with the switch off.

(On), I

(On)

(On) and I

(On) represent the channel leakage currents with

the switch on.

INL

is the maximum input voltage for Logic 0.

INH

is the minimum input voltage for Logic 1.

INL

, I

INH

INL

and I

INH

represent the low and high input currents of the

digital inputs.

(Off)

(Off) represents the off switch drain capacitance, which is

measured with reference to ground.

(Off)

(Off) represents the off switch source capacitance, which is

measured with reference to ground.

(On), C

(On)

(On) and C

(On) represent on switch capacitances, which

are measured with reference to ground.

is the digital input capacitance.

represents the delay between applying the digital control

input and the output switching on.

OFF

represents the delay between applying the digital control

input and the output switching off.

represents the off time measured between the 80% point of

both switches when switching from one address state to

another.

Fault Response Time

Fault response time is the delay between a fault condition (V

) on an analog input and the corresponding output below V

Fault Recovery Time

Fault recovery time is, in recovering from a fault condition, the

delay between 50% of the input signal to 90% of the output

signal.

Charge Injection

A measure of the glitch impulse transferred from the digital

input to the analog output during switching.

Off Isolation

Off isolation is a measure of unwanted signal coupling through

an off switch.

Charge Injection

Charge injection is a measure of the glitch impulse transferred

from the digital input to the analog output during switching.

Crosstalk

Crosstalk is a measure of unwanted signal that is coupled

through from one channel to another as a result of parasitic

capacitance.

Bandwidth

Bandwidth is the frequency at which the output is attenuated

by 3 dB.

On Response

On response is the frequency response of the on switch.

Insertion Loss

Insertion loss is the loss due to the on resistance of the switch.

Total Harmonic Distortion + Noise (THD + N)

The ratio of the harmonic amplitude plus noise of the signal to

the fundamental is represented by THD + N.

AC Power Supply Rejection Ratio (ACPSRR)

ACPSRR is the ratio of the amplitude of signal on the output to

the amplitude of the modulation. This is a measure of the ability

of the part 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.

ADG4612/ADG4613

Rev. 0 | Page 17 of 24

THEORY OF OPERATION

The ADG4612/ADG4613 contain four independent single-

pole/single-throw (SPST) switches. Each switch is rail-to-rail

and conducts equally well in both directions when on.

The ADG4612/ADG4613 has two modes of operation: normal

mode and isolation mode.

The operation modes are made possible by a special detection

circuitry that monitors the voltage levels at the source or drain

terminals and V

relative to ground. Depending on these

voltage levels, the device operates in normal mode or isolation

mode accordingly.

Isolation mode is a useful feature that isolates the inputs from

the outputs where input signals may be present before supplies

or during positive fault conditions that can occur in applications.

Normal Mode

In normal mode, the switch functions as a normal 4 × SPST

switch, whereby the switch is controlled by the logic input pins,

IN1 to IN4.

The following three conditions need to be satisfied for the

switch to be in the on condition;

• V

≥ 2.7 V; and

• Input signal, V

, V

< V

+ V

; and

• Logic input, INx set to on level

When the switch is in the on condition, if the signal range is

from V

to −5.5 V, the signals present on the switch inputs are

passed through to the switch output. If the analog input exceeds

by a threshold voltage, V

, the switch turns off and is in

isolation mode.

If the analog input signal exceeds the negative supply, V

, when

the switch is off, the switch blocks a signal up to −5.5 V. If the

switch is on, the switch remains on, and this signal is passed to

the output. See the Negative Fault Condition; Negative Signal

Handling section for more details.

Isolation Mode

In isolation mode, all switches are in the off condition. The

switch inputs are isolated from the switch outputs. The switch

inputs are high impedance inputs with greater than 475 kΩ

impedance to V

ground and across the switch. This prevents

any current from flowing that can damage the switch. This is

very useful in applications where analog signals may be present

at the switch inputs before power is present or where the user

has no control over the power supply sequence.

The switch is in isolation mode when

• No power supplies are present, that is, when V

is floating

or V

≤ 1 V; or

• Input signal, V

, V

> V

+ V

The negative supply rail, V

, can be floating or 0 V to −5.5 V.

The ground pin must be connected to the ground potential.

Table 11. Switch Operation Mode

GND

, V

(Input Voltage, Sx or Dx) Switch Condition

Switch

Mode

Floating X 0 V −5.5 V to +10.5 V All switches off Isolation

0 V to 16 V Inputs isolated from outputs

0 V to 0.8 V X 0 V −5.5 V to +10.5 V All switches off Isolation

0 V to 16 V Inputs isolated from outputs

≥ 2.7 V X 0 V V

, V

> V

+ V

All switches off Isolation

Inputs isolated from outputs

≥ 2.7 V to 16 V 0 V to −5.5 V 0 V V

to V

– 16 V Switch state is determined by logic

levels, INx

Normal

X = don’t care; for example, floating, 0 V to −5.5 V.

ADG4612/ADG4613

Rev. 0 | Page 18 of 24

BIPOLAR OPERATION AND SINGLE-SUPPLY

OPERATION

The ADG4612/ADG4613 have a maximum operational range

from V

of 16 V. The maximum signal range from source

to drain, V

to V

, is also 16 V. During operation of the device,

the signal range can exceed the power supply rails, but the voltage

between the most negative voltage on the device (V

or V

)

should be within 16 V of the most positive voltage (V

, V

, INx,

or V

). These voltage ratings should be adhered to at all times

for guaranteed functionality. See Table 5 for guaranteed supply

ranges. Signal ranges and power supply ranges exceeding 16 V

may affect the long-term reliability of the device.

The ground pin must always be connected to the GND

potential to ensure proper functionality in isolation and

normal operation mode.

The minimum V

voltage that the part is guaranteed operational

is 2.7 V. The maximum recommended V

voltage is 16 V.

The minimum supply voltage recommended on V

is −5.5 V,

and the maximum voltage allowable on V

is 0 V. Therefore,

given that the V

to V

range is 16 V maximum when, V

−5.5 V, the V

= +10.5 V maximum.

Positive Fault Condition

If the analog input exceeds V

by a threshold voltage, V

, then

the switch turns off and is in isolation mode. The part can handle a

fault of up to 16 V, referenced to the most negative signal. For

example, if V

= 5 V, V

= 0 V, then the switch protects against

an overvoltage of up to 16 V. If V

= −5 V and V

= +5 V, then

the switch protects against an overvoltage of up to +11 V.

Negative Fault Condition; Negative Signal Handling

The ADG4612/ADG4613 are not damaged if the analog inputs

exceed the negative supply, V

. If the switch is in the off condition,

the switch blocks a signal up to −5.5 V. If the switch is in the on

condition, the switch remains on, and the negative signal is passed

to the output; therefore, the ADG4612/ADG4613 can pass a

negative signal up to −5.5 V with V

= 0 V. The user must ensure

that the downstream circuitry can handle this signal level. Also,

the user should ensure the voltage between the most negative

voltage on the device (V

or V

) is within 16 V of the most

positive voltage (V

, V

, INx, or V

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24

ADG4612BCPZ-REEL7

Mfr. #:

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Manufacturer:

Analog Devices Inc.

Description:

Analog Switch ICs Power Off Protect 5V/12V Quad SPST

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