DATA SHEET
KH600
12
10
OUT1
Power Dissipation
The KH600 runs at “constant” power, which may be calculated
by (Total I
s
)(V
s
– (-V
s
)). Under standard operating conditions,
the power is 890mW. The power dissipated in the package is
completely constant, independent of signal level. In other
words, the KH600 runs class A.
Gain (dB)
8
6
4
2
0
1M
10M
100M
1G
OUT2
Power Supply Rejection Ratio (PSRR)
The KH600 has 5 supply pins, +V
s
, -V
s
, +V
b1
, +V
b2
, and
-V
b
. All of these sources must be considered when measuring
the PSRR. Figure 8 shows the response of +V
s
and -V
s
,
looking at OUT2. +V
s
and -V
s
have the same effect on OUT1.
-20
±V
b
=
±5V
Frequency (Hz)
Figure 5: Gain with Single-Ended Input Applied to IN1
Supply Current
The KH600 draws supply current from the 2 V
s
pins as well
as the 3 V
b
pins. Under Standard Conditions, the total supply
current is typically 89mA. Changing the voltages on the bias
voltage pins will change their respective supply currents as
shown in Figures 6 and 7
25
-25
-V
b
-40
-60
dB
-80
+V
s
-V
s
-100
-120
+V
b
Supply Currents (mA)
-V
b
Supply Currents (mA)
20
15
+V
b2
-20
-15
-10
+V
b1
-140
100k
1M
10M
100M
1G
Frequency (Hz)
10
5
0
-5
0
2
4
6
8
Figure 8: ±V
s
PSRR
Figure 9 shows the response of OUT1 and OUT2 when +V
b1
changes. The PSRR of the V
b
pins is “bad”, which means
that they have a large effect on the response of the KH600
when their voltages are changed. This is the desired effect of
the bias voltage pins. As Figure 9 indicates, changing +V
b1
has a greater effect on OUT1 than it does on OUT2.
Changing +V
b1
has a direct effect on OUT1. Changing +V
b2
has a direct effect on OUT2. See the Trimming Differential
Output Offset Voltage section for more details.
0
-20
-40
OUT1
±V
s
=
±5V
.
-5
0
5
+V
b1
(V)
Figure 6: V
b
Supply Currents vs. +V
b1
Changing the voltage on the +Vb1 pin will alter the supply
current for +V
b1
only, +V
b2
and -V
b
stay constant at typically
11mA and 22mA respectively. See Figure 6. The same principle
applies for +V
b2
. And Figure 7 illustrates the effect of
changing -V
b
.
pply Currents vs. -V
b
40
-40
-35
-30
-V
b
-60
+V
b
Supply Currents (mA)
35
30
25
20
15
+V
b1
, +V
b2
dB
-80
-100
-120
-140
100k
1M
10M
100M
1G
-V
b
Supply Currents (mA)
OUT2
-25
-20
-15
-10
-5
0
0
-2
-4
-6
-8
10
5
0
Frequency (Hz)
Figure 9: +V
b
PSRR
-V
b
(V)
Figure 7: V
b
Supply Currents vs -V
b
8
REV. 2 January 2004
CADEKA [ CADEKA MICROCIRCUITS LLC. ]
