Datasheet

4
Signal Chain Design Guide
Operational Amplifiers (Op Amps)
Microchip Technology offers a broad portfolio of op amp
families built on advanced CMOS technology. These
families are offered in single, dual and quad configurations,
which are available in space saving packages.
These op amp families include devices with Quiescent
Current (Iq) per amplifier between 0.45 µA and 6 mA,
with a Gain Bandwidth Product (GBWP) between 9 kHz
and 60MHz, respectively. The op amp with lowest supply
voltage (Vdd) operates between 1.4V and 6.0V, while the op
amp with highest Vdd operates between 6.5V and 16.0V.
These op amp families fall into the following categories:
General Purpose, Precision (including EPROM Trimmed and
mCal Technology) and Zero-Drift.
Instrumentation Amplifiers (INA)
Microchip has expanded its portfolio of amplifiers with the
industry’s first instrumentation amplifier featuring mCal
technology. The MCP6N11 features rail-to-rail input and
output, 1.8V operation and low offset/offset drift.
Comparators
Microchip offers a broad portfolio of low-power and
high-speed comparators. The MCP6541 and MCP6561
family of comparators provide ultra low power, 600 nA
typical, and higher speed with 40 ns propagation delay,
respectively. Both families of comparators are available
with single, dual and quad, as well as with push-pull and
open-drain output options (for MCP6546 and MCP6566).
The MCP65R41 and MCP65R46 family of push-pull and
open-drain output comparators are offered with integrated
reference voltages of 1.21V and 2.4V receptively. This
family provides ±1% typical tolerance while consuming
2.5 μA and high speed with 4μs propagation delay. These
comparators operate with a single-supply voltage as low
as 1.8V to 5.5V, which makes them ideal for low cost
and/or battery powered applications.
Product Overviews
Programmable Gain Amplifier (PGA)
The MCP6S21/2/6/8 and MCP6S91/2/3 PGA families
give the designer digital control over an amplifier using
a serial interface (SPI bus). An input analog multiplexer
with 1, 2, 6 or 8 inputs can be set to the desired input
signal. The gain can be set to one of eight non-inverting
gains: + 1, 2, 4, 5, 8, 10, 16 and 32 V/V. In addition, a
software shutdown mode offers significant power savings
for portable embedded designs. This is all achieved in
one simple integrated part that allows for considerably
greater bandwidth, while maintaining a low supply current.
Systems with multiple sensors are significantly simplified.
The MCP6G01 family are analog Selectable Gain Amplifiers
(SGA). The Gain Select input pin(s) set a gain of + 1V/V,
+10 V/V and + 50 V/V. The Chip Select pin on the
MCP6G03 puts it into shutdown to conserve power.
Analog-to-Digital Converters (ADC)
Microchip offers a broad portfolio of high-precision
Delta-Sigma, SAR and Dual Slope A/D Converters. The
MCP3550/1/3 Delta-Sigma ADCs offer up to 22-bit
resolution with only 120 μA typical current consumption
in a small 8-pin MSOP package. The MCP3421 is a single
channel 18-bit Delta-Sigma ADC and is available in a small
6-pin SOT-23 package. It includes a voltage reference
and PGA. The user can select the conversion resolution
up to 18 bits. The MCP3422/3 and the MCP3424 are
two channel and four channel versions, respectively, of
the MCP3421 device. The MCP300X (10-bit), MCP320X
(12-bit) and MCP330X (13-bit) SAR ADCs combine high
performance and low power consumption in a small
package, making them ideal for embedded control
applications. The MCP3911 analog front end offer two
simultaneously sampled 24-bit Delta-Sigma ADCs making
it ideal for voltage and current measurement, and other
data acquisition applications.
The “Analog-to-Digital Converter Design Guide” (Microchip
Document No. 21841) shows various application
examples of the ADC devices.
Microchip also offers many high accuracy energy metering
devices which are based on the Delta-Sigma ADC cores.
The “Complete Utility Metering Solution Guide” (Microchip
Document No: 24930) offers detailed solutions for
metering applications.