PIC18F87J72-I/PT Microchip Technology, PIC18F87J72-I/PT Datasheet - Page 434

• Manufacturer Part Number: PIC18F87J72-I/PT
• Description: IC PIC MCU 8BIT 14KB FLSH 80TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F87J72-I/PT

• Program Memory Type: FLASH
• Program Memory Size: 128KB (64K x 16)
• Package / Case: 80-TQFP
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 48MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, LVD, POR, PWM, WDT
• Number Of I /o: 51
• Ram Size: 3.8K x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 3.6 V
• Data Converters: A/D 12x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: SPI, USART, SPI, I2C
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 51
• Number Of Timers: 4
• Operating Supply Voltage: 2 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 14
• Controller Family/series: PIC18F
• No. Of I/o's: 51
• Ram Memory Size: 3923Byte
• Cpu Speed: 48MHz
• No. Of Timers: 4
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

PIC18F87J72 FAMILY
APPENDIX B:
B.1
B.1.1
The dual-channel Analog Front End (AFE) contains two
synchronous sampling Delta-Sigma Analog-to-Digital
Converters (ADC), two PGAs, phase delay compensa-
tion block, internal voltage reference, modulator output
block and high-speed 20 MHz SPI compatible serial
interface. The converters contain a proprietary dithering
algorithm for reduced Idle tones and improved THD.
The internal register map contains 24-bit wide ADC
data words, as well as six writable control registers to
program gain, oversampling ratio, phase, resolution,
dithering,
features. The communication is largely simplified with
various continuous read modes that can be accessed
by the DMA of an external device, and with a separate
Data Ready (DR) pin that can directly be connected to
an IRQ input of an external microcontroller.
The AFE is capable of interfacing to a large variety of
voltage and current sensors, including shunts, current
transformers, Rogowski coils and Hall effect sensors.
B.1.2
The AFE incorporates two Delta-Sigma ADCs with a
multi-bit architecture. A Delta-Sigma ADC is an
oversampling converter that incorporates a built-in
modulator which is digitizing the quantity of charge
integrated by the modulator loop. The quantizer is the
block
conversion. The quantizer is typically 1-bit or a simple
comparator which helps to maintain the linearity
performance of the ADC (the DAC structure is in this
case inherently linear).
Multi-bit quantizers help to lower the quantization error
(the error fed back in the loop can be very large with
1-bit quantizers) without changing the order of the
modulator or the OSR which leads to better SNR
figures. However, typically, the linearity of such
architectures is more difficult to achieve since the DAC
is no more simple to realize and its linearity limits the
THD of such ADCs.
DS39979A-page 434
that
Introduction
DESCRIPTION
shutdown,
DELTA-SIGMA ADC
ARCHITECTURE
is
performing
DUAL-CHANNEL,
24-BIT AFE
REFERENCE
Reset
the
and
analog-to-digital
communication
Preliminary
The 5-level quantizer is a Flash ADC composed of
4 comparators, arranged with equally spaced thresh-
olds and a thermometer coding. The AFE also includes
proprietary, 5-level DAC architecture that is inherently
linear for improved THD figures.
B.1.3
• Two synchronous sampling 16/24-bit resolution
• 91 dB SINAD, -104 dBc THD (up to 35
• Programmable data rate of up to 64 ksps
• Ultra Low-Power Shutdown mode with <2 µA
• -133 dB crosstalk between the two channels
• Low drift internal voltage reference: 12 ppm/°C
• Differential voltage reference input pins
• High gain PGA on each channel (up to 32V/V)
• Phase delay compensation between the two
• Separate modulator outputs for each channel
• High-speed addressable 20 MHz SPI interface
• Independent analog and digital power supplies
• Low-power consumption (14 mW typical at 5V)
B.1.4
• Energy Metering and Power Measurement
• Automotive
• Portable Instrumentation
• Medical and Power Monitoring
Delta-Sigma A/D Converters with proprietary
multi-bit architecture
109 dB SFDR for each channel
channels with 1 µs time resolution
with Mode 0,0 and 1,1 compatibility
4.5V-5.5V SAV
FEATURES
APPLICATIONS
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 2010 Microchip Technology Inc.
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