CS3001-ISZR Cirrus Logic Inc, CS3001-ISZR Datasheet - Page 11

• Manufacturer Part Number: CS3001-ISZR
• Description: IC OPAMP SGL PREC LOW-V 8-SOIC
• Manufacturer: Cirrus Logic Inc

Specifications of CS3001-ISZR

• Amplifier Type: Instrumentation
• Number Of Circuits: 1
• Output Type: Rail-to-Rail
• Slew Rate: 5 V/µs
• Current - Input Bias: 100pA
• Voltage - Input Offset: 10µV
• Current - Supply: 2.1mA
• Voltage - Supply, Single/dual (±): 2.7 V ~ 6.7 V, ±1.35 V ~ 3.35 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC
• For Use With: 598-1495 - BOARD EVAL OPAMP FOR CS30XX
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output / Channel: -
• -3db Bandwidth: -
• Gain Bandwidth Product: -

The loop gain plot shown in
the unity gain configuration, and indicates how this
is modified when using the amplifier in a higher
gain configuration with compensation. If it is con-
figured for higher gain, for example, 60 dB, the
x–axis will move up by 60 dB (line B). Capacitor
C2 adds a zero and a pole. The modified plot indi-
cates the effects of introducing the pole and zero
due to capacitor C2. The pole can be located at any
frequency higher than the hand-over frequency, the
zero has to be at a frequency lower than the hand-
over frequency so as to provide adequate gain mar-
DS490F9
Figure 18. Loop Gain Plot: Unity Gain and with Pole-zero Compensation
Figure 18
illustrates
-20 dB/dec
FREQUENCY
-100 dB/dec
50kHz
X
z
Margin
1
gin. The separation between the pole and the zero
is governed by the closed loop gain. The zero (z
occurs at the intersection of the –100 dB/decade
and –80 dB/decade slopes. The point X in the fig-
ure should be at closed loop gain plus 20 dB gain
margin. The value for C2 = 1/(2π R1 P1). Setting
the pole of the filter to P1 = 1 MHz works very well
and is independent of gain. As the closed loop gain
is changed, the zero location is also modified if R1
remains fixed. Capacitor C2 can be increased in
value to limit the amplifier’s rising noise above
2 kHz.
-80 dB/dec
1MHz
Desired Closed
5MHz
Loop Gain
p
1
B
CS3001
CS3002
11
1
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