ISL28470 Intersil Corporation, ISL28470 Datasheet - Page 10

• Manufacturer Part Number: ISL28470
• Description: (ISL28270 - ISL28470) Rail-to-Rail Input and Output (RRIO) Instrumentation Amplifier
• Manufacturer: Intersil Corporation

Pin Descriptions
16 Ld QSOP
ISL28270
2, 15
3, 14
4, 13
5, 12
6, 11
7, 10
FB-
1, 9
IN-
16
8
FB-
IN-
CIRCUIT 1A
16 Ld QSOP
CIRCUIT 1B
ISL28273
2, 15
3, 14
4, 13
5, 12
6, 11
7, 10
1, 9
16
8
28 Ld QSOP
ISL28470
V+
IN+
FB+
V-
16, 28
17, 27
18, 26
19, 25
20, 24
21, 23
10
14,15
1, 13
2, 12
3, 11
4, 10
V+
V-
5, 9
6, 8
IN+
FB+
22
7
PIN NAME
LOGIC
OUT_A,B
FB+_A,B
FB-_A,B
IN+_A,B
EN_A,B
PIN
IN-_A,B
C_D
C_D
C_D
C_D
C_D
C_D
NC
V
V-
ISL28270, ISL28273, ISL28470
+
CIRCUIT 2
EQUIVALENT
Circuit 1A,
Circuit 1A,
Circuit 1A,
Circuit 1A,
Circuit 1B
Circuit 1B
Circuit 1B
Circuit 1B
CIRCUIT
Circuit 3
Circuit 2
Circuit 4
Circuit 4
V+
V-
Output Voltage. A complementary Class AB common-source output
stage drives the output of each channel. When disabled, the outputs are
in a high impedance state
Positive Feedback high impedance terminals. ISL28270 and ISL28470
input circuit is shown in Circuit 1A, and the ISL28273 input circuit is
shown in Circuit 1B.
ISL28273: to avoid offset drift, it is recommended that the terminals of
the ISL28273 are not overdriven beyond 1V and the input current must
never exceed 5mA.
Negative Feedback high impedance terminals. The FB- pins connect to
an external resistor divider to individually set the desired gain of the in-
amp. ISL28270 and ISL28470 input circuit is shown in Circuit 1A, and the
ISL28273 input circuit is shown in Circuit 1B.
ISL28273: to avoid offset drift, it is recommended that the terminals of
the ISL28273 are not overdriven beyond 1V and the input current must
never exceed 5mA.
High impedance Inverting input terminals. Connect to the low side of the
input source signal. ISL28270 and ISL28470 input circuit is shown in
Circuit 1A, and the ISL28273 input circuit is shown in Circuit 1B.
ISL28273: to avoid offset drift, it is recommended that the terminals of
the ISL28273 are not overdriven beyond 1V and the input current must
never exceed 5mA.
High impedance Non-inverting input terminals. Connect to the high side
of the input source signal. ISL28270 and ISL28470 input circuit is shown
in Circuit 1A, and the ISL28273 input circuit is shown in Circuit 1B.
ISL28273: to avoid offset drift, it is recommended that the terminals of
the ISL28273 are not overdriven beyond 1V and the input current must
never exceed 5mA.
Active LOW logic pins. When pulled above 2V, the corresponding
channel turns off and OUT is high impedance. A channel is enabled
when pulled below 0.8V. Built-in pull downs define each EN pin LOW
when left floating.
Positive Supply terminal shared by all channels.
Negative Supply terminal shared by all channels. Grounded for single
supply operation.
No Connect, pins can be left floating or grounded
CIRCUIT 3
V-
OUT
V+
PIN FUNCTION
V+
V-
CIRCUIT 4
CAPACITIVELY
COUPLED
ESD CLAMP
April 13, 2007
FN6260.2