THAT1430 datasheet(3/8 Pages) ETC

3 / 8 page

Theory of Operation

OutSmartsÔ technology

The THAT 1420 and 1430 are similar devices,

both employing the OutSmarts topology, a variation

of circuitry originally developed at Audio Toys, Inc.

OutSmarts topology employs two negative-feedback

loops -- one to control the differential signal, and a

separate loop to control the common mode output

levels.

Figures 2 and 3 show the gain core common to

both the THAT 1420 and 1430. The gain core is a

single amplifier that includes two differential input

pairs, Cin+/- and Din+/-, and complementary outputs,

Vout+ and Vout-, related to each other by two gain ex-

pressions, AD(s) and AC(s). The first pair of differen-

tial inputs, Din+/-, are connected to the differential

feedback network between the outputs and the input

signal. The second differential input pair, Cin+/-,is

connected to a bridge circuit which generates an er-

ror signal that is used to servo the common-mode be-

havior of the outputs. The loop equations are then,

()

A D

OUT

where AD is the differential open-loop gain, and

()

A C

OUT

where AC is the common-mode open-loop gain.

THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA

Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com

Rev. 4/24/01

Page 3

Preliminary Information

Electrical Characteristics (cont’d.)

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Units

Differential Output Offset

VOOD

RL=600W

-10

±4

Differential Output

Voltage Swing,Pos

VIN = ±18V

VCC-2

Differential Output

Voltage Swing,Neg

VIN = ±18V

VEE+2

Output Impedance

Quiescent Supply Current

Unloaded, VIN = 0

5.2

Short Circuit Output Current

ISC

Voltage Supply Range

±4

±18

Din+

Cin+

Cin-

Din-

Out-

Sens+

Out+

Sens-

Vcc

In+

Vee

Gnd

Dout-

Dout+

10k

20k

10p

THAT 1420

CEXT

Figure 2. THAT 1420 Equivalent Circuit Diagram

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