THS4504 datasheet(21/38 Pages) TI

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OUT) +

IN)(1–β)–VIN–(1–β) ) 2VOCMβ

OUT– +

–V

IN)(1–β) ) VIN–(1–β) ) 2VOCMβ

(1)

(2)

N + VIN–(1–β) ) V OUT)β

Where:

β +

F ) RG

P + VIN)(1–β) ) VOUT–β

(3)

(4)

(5)

VOCM

+VS

Rg1

Rg2

Rf1

Rf2

−

Application Circuit for the THS4500 and THS4501,

Featuring Single-Supply Operation With a

Ground-Referenced Input Signal

VOCM

−

VOUT−

VOUT+

VIN+

VIN−

Diagram For Input Common-Mode Range Equations

VOCM

+VS

Rg1

Rg2

Rf1

Rf2

−

−VS

Application Circuit for the THS4500 and THS4501,

Featuring Split-Supply Operation With an Input

Signal Referenced at the Midrail

THS4504

THS4505

SLOS363C – AUGUST 2002 – REVISED MARCH 2004

NOTE:

Figure 75.

The equations denote the

device inputs as VN and

VP, and the circuit inputs

as VIN+ and VIN-.

Figure 77.

Table 1 and Table 2 show the input common-mode

Figure 76.

range requirements for two different input scenarios,

an input referenced around the negative rail and an

Equations 1-5 allow calculation of the required input

input referenced around midrail. The tables highlight

common-mode range for a given set of input con-

the differing requirements on input common-mode

ditions.

range, and illustrate reasoning for choosing either the

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

The equations allow calculation of the input common-

around the negative power supply, the THS4500/1

mode range requirements given information about the

should be chosen since its input common-mode

input signal, the output voltage swing, the gain, and

range includes the negative supply rail. For all other

the output common-mode voltage. Calculating the

situations, the THS4502/3 offers slightly improved

maximum and minimum voltage required for VN and

distortion and noise performance for applications with

VP (the amplifier's input nodes) determines whether

input signals centered between the power supply

or not the input common-mode range is violated or

rails.

not. Four equations are required. Two calculate the

output voltages and two calculate the node voltages

at VN and VP (note that only one of these needs

calculation, as the amplifier forces a virtual short

between the two nodes).

Table 1. Negative-Rail Referenced

Gain (V/V)

VIN+ (V)

VIN- (V)

VIN (VPP)

VOCM (V)

VOD (VPP)

VNMIN (V)

VNMAX (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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