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LM346M Datasheet(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM346M
Description  Programmable Quad Operational Amplifiers
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM346M Datasheet(HTML) 8 Page - National Semiconductor (TI)

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Application Hints (Continued)
Input Capacitance: The input capacitance, C
IN,ofthe
LM146 is approximately 2 pF; any stray capacitance, C
S,
(due to external circuit circuit layout) will add to C
IN. When
resistive or active feedback is applied, an additional pole is
added to the open loop frequency response of the device.
For instance with resistive feedback (
Figure 2), this pole oc-
curs at 12
π (R1||R2) (C
IN +CS). Make sure that this pole oc-
curs at least 2 octaves beyond the expected −3 dB fre-
quency corner of the closed loop gain of the amplifier; if not,
place a lead capacitor in the feedback such that the time
constant of this capacitor and the resistance it parallels is
equal to the R
I(CS +CIN), where RI is the input resistance of
the circuit.
Temperature Effect on the GBW: The GBW (gain band-
width product), of the LM146 is directly proportional to I
SET
and inversely proportional to the absolute temperature.
When using resistors to set the bias current, I
SET, of the de-
vice, the GBW product will decrease with increasing tem-
perature. Compensation can be provided by creating an I
SET
current directly proportional to temperature (see typical ap-
plications).
Isolation Between Amplifiers: The LM146 die is isother-
mally layed out such that crosstalk between
all 4 amplifiers is
in excess of −105 dB (DC). Optimum isolation (better than
−110 dB) occurs between amplifiers A and D, B and C; that
is, if amplifier A dissipates power on its output stage, ampli-
fier D is the one which will be affected the least, and vice
versa. Same argument holds for amplifiers B and C.
LM146 Typical Performance Summary: The LM146 typical
behaviour is shown in
Figure 3. The device is fully predict-
able. As the set current, I
SET, increases, the speed, the bias
current, and the supply current increase while the noise
power decreases proportionally and the V
OSremains con-
stant. The usable GBW range of the op amp is 10 kHz to
3.5−4 MHz.
Low Power Supply Operation: The quad op amp operates
down to ±1.3V supply. Also, since the internal circuitry is bi-
ased through programmable current sources, no degrada-
tion of the device speed will occur.
Speed vs Power Consumption: LM146 vs LM4250 (single
programmable). Through
Figure 4, we observe that the
LM146’s power consumption has been optimized for GBW
products above 200 kHz, whereas the LM4250 will reach a
GBW of no more than 300 kHz. For GBW products below
200 kHz, the LM4250 will consume less power.
DS005654-9
FIGURE 2.
DS005654-8
FIGURE 3. LM146 Typical Characteristics
DS005654-10
FIGURE 4. LM146 vs LM4250
www.national.com
8


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