MCP3551-E/SN Microchip Technology, MCP3551-E/SN Datasheet - Page 13

• Manufacturer Part Number: MCP3551-E/SN
• Description: IC ADC 22BIT 2.7V 1CH SPI 8SOIC
• Manufacturer: Microchip Technology

Specifications of MCP3551-E/SN

• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Number Of Bits: 22
• Sampling Rate (per Second): 13.75
• Data Interface: Serial, SPI™
• Number Of Converters: 1
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Architecture: Delta-Sigma
• Conversion Rate: 0.014 KSPs
• Input Type: Voltage
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MCP355XDV-MS1 - BOARD DEV SENSOR APP MCP355XMCP355XDM-TAS - BOARD DEMO TINY APP SNSR MCP355X
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

3.0
The descriptions of the pins are listed in
TABLE 3-1:
3.1
The MCP3550/1/3 devices accept single-ended
reference voltages from 0.1V to V
converter output noise is dominated by thermal noise,
which is independent of the reference voltage, the
output
diminishing the reference voltage at the V
A reduced voltage reference will significantly improve
the INL performance (see
error is proportional to V
3.2
The MCP3550/1/3 devices accept a fully differential
analog input voltage to be connected on the V
V
converted is defined by V
differential voltage range specified for ensured
accuracy is from -V
converter will still output valid and usable codes with
the inputs overranged by up to 12% (see Section 5.0
“Serial Interface”) at room temperature. This
overrange is clearly specified by two overload bits in
the output code.
The absolute voltage range on these input pins extends
from V
below this range will create leakage currents through
the Electrostatic Discharge (ESD) diodes. This current
will increase exponentially, degrading the accuracy and
noise performance of the device. The common mode of
the analog inputs should be chosen such that both the
differential analog input range and the absolute voltage
range on each pin are within the specified operating
range
Characteristics”.
© 2009 Microchip Technology Inc.
Type Identification: I = Input; O = Output; P = Power
IN
- input pins. The differential voltage that is
MCP3550/1/3
MSOP, SOIC
SS
noise
PIN DESCRIPTIONS
Voltage Reference (V
Analog Inputs (V
defined
– 0.3V to V
1
2
3
4
5
6
7
8
is
PIN FUNCTION TABLE
not
in
DD
REF
REF
+ 0.3V. Any voltage above or
SDO/RDY
significantly
Symbol
Section 1.0
2
to +V
V
V
SCK
Figure
V
V
V
.
CS
IN
REF
IN
IN
DD
SS
IN
+
-
= V
+, V
REF
2-4); the INL max
REF
IN
. However, the
IN
+ – V
DD
improved
-)
Table
)
REF
. Since the
“Electrical
input pin.
IN
3-1.
I/O/P
IN
-. The
O
P
P
+ and
I
I
I
I
I
by
Reference Voltage Analog Input Pin
Non-inverting Analog Input Pin
Inverting Analog Input Pin
Ground Pin
Serial Clock Digital Input Pin
Data/Ready Digital Output Pin
Chip Select Digital Input Pin
Positive Supply Voltage Pin
3.3
V
circuitry within the MCP3550/1/3. This pin requires an
appropriate bypass capacitor of 0.1 µF. The voltage on
this pin should be maintained in the 2.7V to 5.5V range
for specified operation. V
current return path for both analog and digital circuitry
of the MCP3550/1/3. If an analog ground plane is
available, it is recommended that this device be tied to
the analog ground plane of the Printed Circuit Board
(PCB).
3.4
SCK synchronizes data communication with the
device. The device operates in both SPI mode 1,1 and
SPI mode 0,0. Data is shifted out of the device on the
falling edge of SCK. Data is latched in on the rising
edge of SCK. During CS high times, the SCK pin can
idle either high or low.
3.5
SDO/RDY is the output data pin for the device. Once a
conversion is complete, this pin will go active-low,
acting as a ready flag. Subsequent falling clock edges
will then place the 24-bit data word (two overflow bits
and 22 bits of data, see Section 5.0 “Serial
Interface”) on the SPI bus through the SDO pin. Data
is clocked out on the falling edge of SCK.
DD
is the power supply pin for the analog and digital
Supply Voltage (V
Serial Clock (SCK)
Data Output (SDO/RDY)
Description
MCP3550/1/3
SS
is the ground pin and the
DD
, V
DS21950E-page 13
SS
)