ISL28274 Datasheet, PDF (15/18 Pages) Intersil Corporation – Micropower, Single Supply, Rail-to-Rail Input-Output Instrumentation Amplifier and Precision Operational Amplifier

ISL28274, ISL28474
Pin Descriptions
ISL28274
ISL28474
(16 LD QSOP) (24 LD QSOP)
1, 9, 13, 14
11, 14
2
1, 24
3
2, 23
4
3, 22
5
4, 21
6
5, 20
7
6, 19
8
18
10
8, 17
11
9, 16
12
10, 15
15
12, 13
16
7
IA = Instrumentation Amplifier
PIN NAME
NC
IA OUT
IA OUT_1
IA OUT_2
IA FB+
IA FB+_1
IA FB+_2
IA FB-
IA FB-_1
IA FB-_2
IA IN-
IA IN-_1
IA IN-_2
IA IN+
IA IN+_1
IA IN+_2
DNC
V-
DNC
IN+
IN+ 1
IN+ 2
IN-
IN- 1
IN- 2
OUT
OUT 1
OUT 2
V+
V₊
IN-
IN+
V_-
CIRCUIT 1
EQUIVALENT
CIRCUIT
DESCRIPTION
No internal connection
Circuit 2 Instrumentation Amplifier output
Circuit 1 Instrumentation Amplifier Feedback from non-inverting output
Circuit 1 Instrumentation Amplifier Feedback from inverting output
Circuit 1 Instrumentation Amplifier inverting input
Circuit 1 Instrumentation Amplifier non-inverting input
Circuit 3
Circuit 1
Do Not Connect, Internal connection - Must be left floating
Negative power supply
Do Not Connect, Internal connection - Must be left floating
Amplifier non-inverting input
Circuit 1 Amplifier inverting input
Circuit 2 Amplifier output
Circuit 3 Positive power supply
V₊
OUT
V_-
CIRCUIT 2
V+
CAPACITIVELY
COUPLED
ESD CLAMP
V-
CIRCUIT 3
Description of Operation and Application
Information
Product Description
The ISL28274 and ISL28474 provide both a micropower
instrumentation amplifier (Amp A) and a low power precision
amplifier (Amp B) in the same package. The amplifiers
deliver rail-to-rail input amplification and rail-to-rail output
swing on a single 2.4V to 5V supply. They also deliver
excellent DC and AC specifications while consuming only
60µA typical supply current per amplifier. Because the
instrumentation amplifiers provide an independent pair of
feedback terminals to set the gain and to adjust the output
level, the in-amp achieves high common-mode rejection
ratio regardless of the tolerance of the gain setting resistors.
The instrumentation amplifier is internally compensated for a
minimum closed loop gain of 100 or greater.
Input Protection
The input and feedback terminals have internal ESD
protection diodes to both positive and negative supply rails,
limiting the input voltage to within one diode drop beyond the
supply rails. If overdriving the inputs is necessary, the
external input current must never exceed 5mA. An external
series resistor may be used as a protection to limit excessive
external voltage and current from damaging the inputs.
15
FN6345.3
May 14, 2009