CS3011-ISZR Cirrus Logic Inc, CS3011-ISZR Datasheet - Page 10

• Manufacturer Part Number: CS3011-ISZR
• Description: IC OPAMP SGL PREC LOW-V 8-SOIC
• Manufacturer: Cirrus Logic Inc

Specifications of CS3011-ISZR

• Amplifier Type: Instrumentation
• Number Of Circuits: 1
• Output Type: Rail-to-Rail
• Slew Rate: 2 V/µs
• Current - Input Bias: 50pA
• Voltage - Input Offset: 10µV
• Current - Supply: 900µA
• 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: -

3.2
3.2.1
The CS3011 and CS3012 achieve ultra-high open
loop gain.
non-inverting gain configuration. Th e ope n lo op
gain and phase plo ts indicate that the amplifier is
stable for closed-loop gains less than 50 V/V. For
a gain of 50, the phase margin is between 40° and
60° de pending upon the load ing conditions. As
shown in
input ca pacitance at the + and – signal input s of
typically 50 pF. This capacitance adds an addition-
10
Open Loop Gain and Stability Compensation
Discussion
Figure 16 on page
Figure 15
il lustrates the ampl ifier in a
11, the op amp has an
V in
Figure 15. Non-Inverting Gain Configuration
R
S
R 1
al pole in the loop gain transfer function at a fre-
quency of f = 1/(2πR*C
combination of R1 and R2 (R1 || R2). A higher val-
ue for R produces a pole at a lower freq uency, thus
reducing the phase margin. R1 is recommended to
be less than or equal to 100 ohms, which results in
a pole at 30 MHz or higher. If a higher value of R1
is desired, a compensation capacitor (C2) should
be added in parallel with R2. C2 should be chosen
such that R2*C2 ≥ R1*C
R 2
V o
in
in
) where R is t he para llel
.
CS3012
CS3011
DS597F6