KH600AI datasheet(8/13 Pages) CADEKA

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DATA SHEET

KH600

REV. 2 January 2004

Figure 5: Gain with Single-Ended Input Applied to IN1

Supply Current

The KH600 draws supply current from the 2 Vs pins as well

as the 3 Vb 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

Figure 6: Vb Supply Currents vs. +Vb1

Changing the voltage on the +Vb1 pin will alter the supply

current for +Vb1 only, +Vb2 and -Vb stay constant at typically

11mA and 22mA respectively. See Figure 6. The same principle

applies for +Vb2. And Figure 7 illustrates the effect of

changing -Vb.

Figure 7: Vb Supply Currents vs -Vb

Power Dissipation

The KH600 runs at “constant” power, which may be calculated

by (Total Is)(Vs – (-Vs)). 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.

Power Supply Rejection Ratio (PSRR)

The KH600 has 5 supply pins, +Vs, -Vs, +Vb1, +Vb2, and

-Vb. All of these sources must be considered when measuring

the PSRR. Figure 8 shows the response of +Vs and -Vs,

looking at OUT2. +Vs and -Vs have the same effect on OUT1.

Figure 8: ±Vs PSRR

Figure 9 shows the response of OUT1 and OUT2 when +Vb1

changes. The PSRR of the Vb 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 +Vb1

has a greater effect on OUT1 than it does on OUT2.

Changing +Vb1 has a direct effect on OUT1. Changing +Vb2

has a direct effect on OUT2. See the Trimming Differential

Output Offset Voltage section for more details.

Figure 9: +Vb PSRR

Frequency (Hz)

100M

10M

OUT2

OUT1

-5

+Vb1 (V)

-25

-15

-10

-5

-20

-Vb

+Vb2

+Vb1

pply Currents vs. -Vb

-Vb (V)

-2

-6

-8

-4

+Vb1 , +Vb2

-Vb

-40

-25

-20

-10

-5

-30

-15

-35

-140

-120

-100

-80

-60

-40

-20

Frequency (Hz)

100k

100M

10M

+Vs

-Vs

±V

b = ±5V

-140

-120

-100

-80

-60

-40

-20

Frequency (Hz)

100k

100M

10M

OUT1

OUT2

±V

s = ±5V

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