THAT1206 Datasheet, PDF (4/10 Pages) List of Unclassifed Manufacturers – InGenius High-CMRR Balanced Input Line Receiver

Page 4
InGenius Balanced Line Receiver
Preliminary Information
Electrical Characteristics (Cont’d)
Parameter
Output Short Circuit Current
Minimum Resistive Load
Maximum Capacitive Load
Symbol
I_SC
I_CMSC
R_Lmin
R_LCMmin
C_Lmax
C_LCMmax
Conditions
R_L = R_Lcm = 0 W
At CM output
At CM output
At CM output
Min
Typ
Max
—
±25
—
—
±10
—
2
—
—
10
—
—
—
—
300
—
—
50
Units
mA
mA
kW
kW
pF
pF
In-
R3
600R
In+
R1
200k
R2
200k
Ext. DC Source
Gnd
Cb
100u
C1
56p
Vcc
C4
2 _In- ⁸ _{7 100n}
CMout
5
Vcc
CMin
Out
Ref
6
3 Vee
In+ 1
R4
4
U1
2k
THAT120x
C3
100n
Vee
R5
100R
R6
100R
C2
300p
CM Out
Gnd
Main Out
Gnd
Figure 2. THAT1200-series test circuit
Applications
RFI Protection
Figure 3 shows the THAT 1200 configured with
robust RFI input protection. In applications where
RFI rejection is of less concern, the circuit shown Fig-
ure 4 provides a less aggressive approach.
Bootstrap coupling capacitor
Referring to Figure 3, electrolytic capacitor Cb
provides the feedback path for the boostrap circuit.
The capacitor value is chosen to be high enough to
present a sufficiently small impedance to signals at
the low end of the audio spectrum. Its voltage rating
is dependent on the topology of the surrounding cir-
cuitry, as described in the following paragraphs.
AC signals presented to the input stage cause the
two ends of capacitor Cb to swing in tandem so that
virtually no voltage appears across the capacitor.
Consequently, capacitors with small DC working volt-
ages may be used when the previous stage is AC cou-
pled to the input of the THAT 1200.
THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA
Tel: [phone]; Fax: [phone]; Web: www.thatcorp.com