High-Performance, Stand-Alone ADCs for a Variety of Embedded Systems Applications
4 ADC Converter Function Pack Design Guide
ADC Converter Function Pack Design Guide 5
High-Performance, Stand-Alone ADCs for a Variety of Embedded Systems Applications
SAR CONVERTERS – INDUSTRY’S LOWEST-POWER ADCs IN SOT-23A PACKAGES
The MCP3021 and MCP3221 are low-power, tiny 10- and
12-bit SAR ADCs that are ideal for battery powered or
portable data acquisition systems. Based on advanced CMOS
architecture, these devices draw only 180 µA at 400 kHz
I
2
C™ clock. With a 33 kHz I
2
C clock, the current drops to less
than 30 µA. With only 1 µA standby current, the MCP3221 is
currently the world’s lowest-power, 12-bit ADC in a small SOT-
23A package. Communication to either device is performed
using a 2-wire I
2
C compatible interface.
MCP3021 and MCP3221 Applications:
n Data Logging
n Multi-zone Monitoring
n Hand-held Portable Applications
n Battery-powered Test Equipment
n Remote or Isolated Data Acquisition
n Voice-band AC Applications up to 8 kHz
MCP3021 and MCP3221 Key Features:
n 10-bit resolution (MCP3021)
n 12-bit resolution (MCP3221)
n 22 ksps in I
2
C™ Fast Mode
n ±1 LSB DNL, ±1 LSB INL max. (MCP3021)
n ±1 LSB DNL, ±2 LSB INL max. (MCP3221)
n On-chip sample and hold
n I
2
C compatible serial interface with up to 8 devices on a
single 2-wire bus:
- 100 kHz I
2
C Standard Mode
- 400 kHz I
2
C Fast Mode
n Single-supply specified operation: 2.7V to 5.5V
n Low-power CMOS technology:
- 5 nA standby current
- 250 µA active current at 5V, 100 ksps
n Temperature range:
- Industrial: -40°C to +85°C (MCP3221)
- Extended: -40°C to +125°C
An on-chip conversion clock enables independent timing
between the conversion clock, and the serial communication
data rate.
The devices are also addressable, allowing up to eight devices
on a single 2-wire bus. The MCP3021 and MCP3221 run on a
single supply voltage that operates over a broad voltage range
of 2.7V to 5.5V. Accuracy is superb, providing less than
±1 LSB of differential non-linearity (DNL) and less than
±2 LSB of integral non-linearity (INL).
ADC Product Specifications
Device
Resolution
(bits)
Maximum
Sampling
Rate
(samples/sec)
# of
Input
Channels Input Type Interface
Input
Voltage
Range
(V)
Active
Current
Max.
(µA)
Max.
INL
Temperature Range
(C°) Packages
MCP3021 10 22 1 Single-ended I
2
C™ 2.7 to 5.5 250 +1 LSB -40 to +85 5 SOT-23A
MCP3221 12 22 1 Single-ended I
2
C 2.7 to 5.5 250 ±2 LSB
-40 to +125
5 SOT-23A
MCP3221 Functional Block Diagram and DNL vs. Digital Code Graph
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