ICL7621DCPA Intersil, ICL7621DCPA Datasheet - Page 4

• Manufacturer Part Number: ICL7621DCPA
• Description: IC OPAMP DUAL 0.5MHZ CMOS 8-DIP
• Manufacturer: Intersil

Specifications of ICL7621DCPA

• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Slew Rate: 0.16 V/µs
• Gain Bandwidth Product: 480kHz
• Current - Input Bias: 1pA
• Voltage - Input Offset: 15000µV
• Current - Supply: 100µA
• Current - Output / Channel: 1mA
• Voltage - Supply, Single/dual (±): 2 V ~ 16 V, ±1 V ~ 8 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Output Type: -
• -3db Bandwidth: -
• Other names: ICL7621DCPAIS

Application Information
Static Protection
All devices are static protected by the use of input diodes.
However, strong static fields should be avoided, as it is
possible for the strong fields to cause degraded diode
junction characteristics, which may result in increased input
leakage currents.
Latchup Avoidance
Junction-isolated CMOS circuits employ configurations
which produce a parasitic 4-layer (PNPN) structure. The
4-layer structure has characteristics similar to an SCR, and
under certain circumstances may be triggered into a low
impedance state resulting in excessive supply current. To
avoid this condition, no voltage greater than 0.3V beyond the
supply rails may be applied to any pin. In general, the op
amp supplies must be established simultaneously with, or
before any input signals are applied. If this is not possible,
the drive circuits must limit input current flow to 2mA to
prevent latchup.
Choosing the Proper I
Each device in the ICL76XX family has a similar I
scheme, which allows the amplifier to be set to nominal
quiescent currents of 10µA, 100µA or 1mA. These current
settings change only very slightly over the entire supply voltage
range. The ICL7611/12 have an external I
permitting user selection of each amplifiers’ quiescent current.
The ICL7621 has a fixed I
NOTE: Low leakage currents allow integration times up to
several hours.
V
IN
FIGURE 3.
λ
FIGURE 1. SIMPLE FOLLOWER
PHOTOCURRENT INTEGRATOR
+
-
ICL76XX
Q
-
+
Q
setting of 100µA.
1µF
ICL76XX
4
+
Q
control terminal,
R
L
≥ 10kΩ
Q
V
setup
OUT
V
OUT
ICL7621
Output Stage and Load Driving Considerations
Each amplifiers’ quiescent current flows primarily in the
output stage. This is approximately 70% of the I
This allows output swings to almost the supply rails for
output loads of 1MΩ, 100kΩ, and 10kΩ, using the output
stage in a highly linear class A mode. In this mode,
crossover distortion is avoided and the voltage gain is
maximized. However, the output stage can also be operated
in Class AB for higher output currents (see graphs in “Typical
Performance Curves” beginning on page 6). During the
transition from Class A to Class B operation, the output
transfer characteristic is nonlinear and the voltage gain
decreases.
Frequency Compensation
The ICL76XX are internally compensated, and are stable
for closed loop gains as low as unity with capacitive loads
up to 100pF.
Typical Applications
The user is cautioned that, due to extremely high input
impedances, care must be exercised in layout, construction,
board cleanliness, and supply filtering to avoid hum and
noise pickup.
V
NOTE: Since the output range swings exactly from rail to rail,
frequency and duty cycle are virtually independent of power supply
variations.
IN
100kΩ
FIGURE 4.
1/2
ICL7621
+
-
+5
WAVEFORM GENERATOR
FIGURE 2. LEVEL DETECTOR
TRIANGLE/SQUARE WAVE GENERATOR
1MΩ
V-
1MΩ
DUTY CYCLE
+
-
680kΩ
+5
1MΩ
ICL76XX
1/2
ICL7621
+
-
1MΩ
V+
V
TO CMOS OR
LPTTL LOGIC
Q
OUT
settings.
March 4, 2010
FN3403.5