ISL28166 Datasheet, PDF (9/12 Pages) Intersil Corporation – 39uA Micropower Single and Dual Rail-to-Rail Input-Output Low Input Bias Current (RRIO) Op Amps

Pin Descriptions
ISL28166
(6 Ld SOT-23)
4
ISL28166
(8 Ld SO)
1, 5
2
3
3
2
4
1
6
ISL28166, ISL28266
ISL28266
(8 Ld SO)
(8 Ld MSOP)
2 (A)
6 (B)
3 (A)
5 (B)
4
1 (A)
7 (B)
PIN NAME
NC
IN-
FUNCTION
Not connected
Inverting input
EQUIVALENT CIRCUIT
V+
IN+
V-
OUT
IN-
Non-inverting
input
(See circuit 1)
Negative supply
Output
Circuit 1
IN+
V-
V+
OUT
6
7
5
8
8
V+
Positive supply
ENABLE Chip enable
V-
Circuit 2
V+
CE
Applications Information
Introduction
The ISL28166 is a single BiMOS rail-to-rail input, output
(RRIO) operational amplifier with an enable feature. The
ISL28266 is a dual version without the enable feature. Both
devices are designed to operate from single supply (2.4V to
5.0V) or dual supplies (±1.2V to ±2.5V) while drawing only
39μA of supply current per amplifier. This combination of low
power and precision performance makes this device suitable
for a variety of low power applications including battery
powered systems.
Rail-to-Rail Input/Output
These devices feature bipolar inputs which have an input
common mode range that extends to the rails, and CMOS
outputs that can typically swing to within about 4mV of the
supply rails with a 100kΩ load. The NMOS sinks current to
swing the output in the negative direction. The PMOS sources
current to swing the output in the positive direction.
V-
Circuit 3
Input Protection
All input terminals have internal ESD protection diodes to
both positive and negative supply rails, limiting the input
voltage to within one diode beyond the supply rails. They
also contain back-to-back diodes across the input terminals.
For applications where the input differential voltage is
expected to exceed 0.5V, external series resistors must be
used to ensure the input currents never exceed 5mA (Figure
35).
-
R_IN
V_IN
+
R_L
V_OUT
FIGURE 35. INPUT CURRENT LIMITING
Enable/Disable Feature
The ISL28166 offers an EN pin that disables the device
when pulled up to at least 2.0V. In the disabled state (output
in a high impedance state), the part consumes typically
10µA. By disabling the part, multiple ISL28166 parts can be
connected together as a MUX. In this configuration, the
outputs are tied together in parallel and a channel can be
9
FN6155.2
February 27, 2007