MCP6S91 Microchip Technology, MCP6S91 Datasheet - Page 20

• Manufacturer Part Number: MCP6S91
• Description: (MCP6S91 - MCP6S93) Low-Gain PGA
• Manufacturer: Microchip Technology

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4.4
The V
impedance voltage source. The source driving the
V
0.1 to maintain reasonable gain accuracy. The supply
voltage V
R
circuit (Z
the gain. Any source driving the V
capable of driving a load as heavy as 0.16 k ||6 pF
(G = 32).
The absolute maximum voltages that can be applied to
the reference input pin (V
V
absolute maximum rating can cause excessive current
to flow into or out of this pin. Current beyond ±2 mA can
cause possible reliability problems. Because an
external series resistor cannot be used (for low gain
error), the external circuit must ensure that V
between V
The V
operation for the V
this region ensures proper operation of the PGA and its
surrounding circuitry.
4.5
These PGAs use a software shutdown command.
When the SPI interface sends a shutdown command,
the internal op amp is shut down and its output placed
in a High-Z state.
The resistive ladder is always connected between
V
output resistance will be on the order of 5 k , with a
path for output signals to appear at the input.
 2004 Microchip Technology Inc.
REF
DD
REF
LAD
+ 0.3V. Voltages on the inputs that exceed this
and V
pin should have an output impedance less than
presents a load at the V
REF
IVR_REF
IN_REF
Rail-to-Rail V
Shutdown Mode
SS
SS
input is intended to be driven by a low-
OUT
and V
– 0.3V and V
; even in shutdown. This means that the
spec shows the region of normal
(5 k /G)||(6 pF)), which depends on
DD
REF
usually meet this requirement.
pin (V
REF
DD
REF
SS
+ 0.3V.
REF
Input
) are V
to V
pin to the external
DD
REF
). Staying within
SS
pin must be
– 0.3V and
REF
is
MCP6S91/2/3
DS21908A-page 20