ISL28133FRUZ-T7 Intersil, ISL28133FRUZ-T7 Datasheet - Page 12

• Manufacturer Part Number: ISL28133FRUZ-T7
• Description: IC OPAMP CHOPPER RRIO 6TDFN
• Manufacturer: Intersil

Specifications of ISL28133FRUZ-T7

• Amplifier Type: Chopper (Zero-Drift)
• Number Of Circuits: 1
• Output Type: Rail-to-Rail
• Slew Rate: 0.2 V/µs
• Gain Bandwidth Product: 400kHz
• Current - Input Bias: 30pA
• Voltage - Input Offset: 2µV
• Current - Supply: 18µA
• Current - Output / Channel: 26mA
• Voltage - Supply, Single/dual (±): 1.65 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -

Long Term V
Figure 37 shows a plot of daily V
individual ISL28133 amplifiers over a continuous 572 day period
at +25°C. The 30 units were connected in a gain of 10k,
mounted on a single PC board and kept at room temp. The 30
amplifier outputs were measured daily by a DVM and scanner
under computer control. The daily V
subtracted from the initial V
The test board was powered from a UPS to maintain
uninterrupted power to the test units. Three instances of lost
measurement data ranging from 2 days to 2 weeks due to power
loss to the measurement scanner were detected, and data were
interpolated.
The change in amplifier V
amplifiers (see Figure 38) was less than ±100nV, and no clear
V
long term drift performance is a result of the chopper amplifier’s
ability to measure and correct V
error contribution due to changes in the long term stability of the
external components (see Figure 39).
OS
FIGURE 37. LONG TERM DRIFT (V
long term drift trend was evident in the data. The excellent
-0.2
-0.4
-0.6
-0.8
-1.0
1.0
0.8
0.6
0.4
0.2
0.0
0
FIGURE 39. LONG TERM DRIFT TEST CIRCUIT
30
60
OS
100kΩ
10Ω
10Ω
90 120 180 240 300 360 420 480 540 600
Drift
OS
OS
+
over the 572 day period for all 30
-
TIME (DAYS)
12
100kΩ
value to calculate the V
+2.5V
OS
-2.5V
OS
errors, leaving only the V
drift measurements of 30
OS
OS
measurements were
vs TIME) FOR 30 UNITS
A
CL
1kΩ
= 10kV/V
OS
V
shift.
OUT
ISL28133
OS
ISL28133 SPICE Model
Figure 40 shows the SPICE model schematic and Figure 41
shows the net list for the ISL28133 SPICE model. The model is a
simplified version of the actual device and simulates important
parameters such as noise, Slew Rate, Gain and Phase. The
model uses typical parameters from the ISL28133. The poles
and zeros in the model were determined from the actual open
and closed-loop gain and phase response. This enables the
model to present an accurate AC representation of the actual
device. The model is configured for ambient temperature of
+25°C.
Figures 42 through 49 show the characterization vs simulation
results for the Noise Density, Frequency Response vs Close Loop
Gain, Gain vs Frequency vs CL and Large Signal Step Response
(4V).
FIGURE 38. LONG TERM DRIFT (V
-0.2
-0.4
-0.6
-0.8
-1.0
1.0
0.8
0.6
0.4
0.2
0.0
0
30
60
90 120 180 240 300 360 420 480 540 600
TIME (DAYS)
OS
vs TIME) FOR A SINGLE UNIT
February 17, 2011
FN6560.4