MCP3551-E/SN Microchip Technology, MCP3551-E/SN Datasheet - Page 17

• 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

:
FIGURE 4-2:
MCP3550-50 Device.
:
FIGURE 4-3:
MCP3550-60 Device.
:
FIGURE 4-4:
MCP3551 Device, Simultaneous 50/60 Hz
Rejection.
© 2009 Microchip Technology Inc.
-100
-120
-100
-120
-100
-110
-120
-20
-40
-60
-80
-20
-40
-60
-80
-10
-20
-30
-40
-50
-60
-70
-80
-90
0
0
0
0
0
0
10 20 30 40 50 60 70 80 90 100 110
50
60
SINC Filter Response,
SINC Filter Response,
SINC Filter Response,
Frequency (Hz)
Frequency (Hz)
Frequency (Hz)
100
120
150
180
200
240
FIGURE 4-5:
Integer Multiples of the Sampling Frequency (f
4.3
The MCP3550/1/3 devices include a highly stable and
accurate internal oscillator that provides clock signals
to the delta-sigma ADC with minimum jitter. The
oscillator is a specialized structure with a low
temperature coefficient across the full range of
specified operation. See
frequencies.
The conversion time is an integer multiple of the
internal clock period and, therefore, has the same
accuracy as the internal clock frequency. The internal
oscillator frequency is 102.4 kHz ±1% for the
MCP3550-50, 112.64 kHz ±1% for the MCP3551, and
122.88 kHz ±1% for the MCP3550-60 and MCP3553
devices, across the full power supply voltage and
specified temperature ranges.
The notch of the digital filter is proportional to the
internal oscillator frequency, with the exact notch
frequency equivalent to the oscillator accuracy
(< 1% deviation). This high accuracy, combined with
wide notches, will ensure that the MCP3551 will have
simultaneous 50 Hz and 60 Hz line frequency rejection
and the MCP3550-50 or MCP3550-60 devices will
have greater than 120 dB rejection (at either 50 or
60 Hz) by the digital filtering, even when jitter is
present.
The internal oscillator is held in the reset condition
when the part is in Shutdown mode to ensure very low
power consumption (< 1 µA in Shutdown mode). The
internal oscillator is independent of all serial digital
interface edges (i.e., state machine processing the
digital SPI interface is asynchronous with respect to the
internal clock edges).
-100
-120
-140
-20
-40
-60
-80
0
0
Internal Oscillator
28160
56320
84480 112640 140800 168960 197120 225280 253440
MCP3550/1/3
SINC Filter Response at
Frequency (Hz)
Table 4-1
DS21950E-page 17
for oscillator
s
).