THS4501CDG4 datasheet(23/48 Pages) TI1

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OUT) +

IN)(1–β)–VIN–(1–β) ) 2VOCMβ

OUT– +

–V

IN)(1–β) ) VIN–(1–β) ) 2VOCMβ

N + VIN–(1–β) ) V OUT)β

VOCM

+VS

RG1

RG2

RF1

RF2

β +

F ) RG

P + VIN)(1–β) ) VOUT–β

VOCM

VOUT

VOUT+

VIN+

VIN

VOCM

+VS

RG1

RG2

RF1

RF2

THS4500

THS4501

www.ti.com

SLOS350F

– APRIL 2002 – REVISED OCTOBER 2011

(1)

(2)

(3)

Where:

(4)

Figure 98. Application Circuit for the THS4500

and THS4501, Featuring Single-Supply Operation

NOTE: The equations denote the device inputs as VN and VP, and

the circuit inputs as VIN+ and VIN–.

(5)

With a Ground-Reference Input Signal

Figure 100. Diagram For Input Common-Mode

Figure 99. Application Circuit for the THS4500

Range Equations

and THS4501, Featuring Split-Supply Operation

With an Input Signal Referenced at the Midrail

Table 1 and Table 2 depict the input common-mode

range requirements for two different input scenarios,

Equation 1 through Equation 5 are used to calculate

an input referenced around the negative rail and an

the required input common-mode range for a given

input referenced around midrail. The tables highlight

set of input conditions.

the differing requirements on input common-mode

range, and illustrate the reasoning to choose either

The

equations

allow

calculation

the

input

the THS4500/1 or the THS4502/3. For signals

common-mode range requirements, given information

referenced around the negative power supply, the

about the input signal, the output voltage swing, the

THS4500/1 should be chosen because its input

gain,

and

the

output

common-mode

voltage.

common-mode range includes the negative supply

Calculating the maximum and minimum voltage

rail. For all other situations, the THS4502/3 offers

required for VN and VP (the amplifier input nodes)

slightly improved distortion and noise performance for

determines whether or not the input common-mode

applications with input signals centered between the

range is violated or not. Four equations are required:

power-supply rails.

two calculate the output voltages and two calculate

the node voltages at VN and VP (note that only one of

these nodes needs calculation, because the amplifier

forces a virtual short between the two nodes).

Table 1. Negative-Rail Referenced

Gain

VIN+

VIN–

VIN

VOCM

VOD

VNMIN

VNMAX

(V/V)

(V)

(VPP)

(V)

(VPP)

(V)

–2.0 to 2.0

2.5

0.75

1.75

–1.0 to 1.0

2.5

0.5

1.167

–0.5 to 0.5

2.5

0.3

0.7

–0.25 to 0.25

0.5

2.5

0.167

0.389

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