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CA3094 Datasheet(PDF) 4 Page - Intersil Corporation

Part No. CA3094
Description  30MHz, High Output Current Operational Transconductance Amplifier (OTA)
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
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3-15
Operating Considerations
The “Sink” Output (Terminal 8) and the “Drive” Output
(Terminal 6) of the CA3094 are not inherently current (or
power) limited. Therefore, if a load is connected between
Terminal 6 and Terminal 4 (V- or Ground), it is important to
connect a current limiting resistor between Terminal 8 and
Terminal 7 (V+) to protect transistor Q13 under shorted load
conditions. Similarly, if a load is connected between Terminal
8 and Terminal 7 (V+), the current limiting resistor should be
connected between Terminal 6 and Terminal 4 or ground. In
circuit applications where the emitter of the output transistor
is not connected to the most negative potential in the
system, it is recommended that a 100
Ω current limiting
resistor be inserted between Terminal 7 and the V+ supply.
1/F Noise Measurement Circuit
When using the CA3094, A, or B audio amplifier circuits, it is
frequently necessary to consider the noise performance of the
device. Noise measurements are made in the circuit shown in
Figure 20. This circuit is a 30dB, non-inverting amplifier with
emitter follower output and phase compensation from
Terminal 2 to ground. Source resistors (RS) are set to 0Ω or
1M
Ω for E noise and I noise measurements, respectively.
These measurements are made at frequencies of 10Hz,
100Hz and 1kHz with a 1Hz measurement bandwidth. Typical
values for 1/f noise at 10Hz and 50
µA IABC are:
and
.
E
N
18nV
Hz
=
I
N
1.8pA
Hz
=
Test Circuits
FIGURE 1. INPUT OFFSET VOLTAGE AND POWER SUPPLY REJECTION TEST CIRCUIT
FIGURE 2. INPUT OFFSET CURRENT TEST CIRCUIT
FIGURE 3. INPUT BIAS CURRENT TEST CIRCUIT
CA3094
2
3
1
4
8
6
5
7
EOUT
30V
15V
100
100
1k
100pF
10k
9.9k
300k
30V
NOTES:
3. Input Offset Voltage:
.
4. For Power Supply Rejection Test: (1) vary V+ by -2V; then (2)
vary V- by +2V.
5. Equations:
6. Power Supply Rejection:
.
Maximum Reading of Step 1 or Step 2
V
IO
E
OUT
100
-----------------
=
V+ Rejection
E
0
OUT
E
1
OUT
200
-------------------------------------------------
=
V- Rejection
E
0
OUT
E
2
OUT
200
-------------------------------------------------
=
(1)
(2)
dB
()
20
1
V
REJECTION
---------------------------------------------
log
=
CA3094
2
1
4
6
8
7
EOUT
15V
1M
220
0.001
µF
150k
1M
30V
3
5
RABC
NOTES:
7. PDISSIPATION = (V+)(I)
8. I
OS
E
OUT
106
VOLTS
AMPS
---------------------
--------------------------------
=
CA3094A
2
3
4
5
7
300k
30V
-
+
NOTE: I
I
I
2
---
=
15V
CA3094, CA3094A, CA3094B




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