AT32UC3B1128-AUT Atmel, AT32UC3B1128-AUT Datasheet - Page 570

• Manufacturer Part Number: AT32UC3B1128-AUT
• Description: IC MCU AVR32 128KB FLASH 48-TQFP
• Manufacturer: Atmel
• Series: AVR®32 UC3r

Specifications of AT32UC3B1128-AUT

• Core Processor: AVR
• Core Size: 32-Bit
• Speed: 60MHz
• Connectivity: I²C, IrDA, SPI, SSC, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 28
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Data Converters: A/D 6x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-TQFP, 48-VQFP
• Package: 48TQFP
• Device Core: AVR32
• Family Name: AT32
• Maximum Speed: 60 MHz
• Operating Supply Voltage: 1.8|3.3 V
• Data Bus Width: 32 Bit
• Number Of Programmable I/os: 28
• Interface Type: I2S/SPI/TWI/USART/USB
• On-chip Adc: 6-chx10-bit
• Number Of Timers: 3
• For Use With: ATSTK600-TQFP48 - STK600 SOCKET/ADAPTER 48-TQFPATAVRONEKIT - KIT AVR/AVR32 DEBUGGER/PROGRMMR770-1008 - ISP 4PORT ATMEL AVR32 MCU SPIATEVK1101 - KIT DEV/EVAL FOR AVR32 AT32UC3B
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

26. Audio Bitstream DAC (ABDAC)
26.1
26.2
32059K–03/2011
Features
Overview
Rev: 1.0.1.1
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The Audio Bitstream DAC converts a 16-bit sample value to a digital bitstream with an average
value proportional to the sample value. Two channels are supported, making the Audio Bit-
stream DAC particularly suitable for stereo audio. Each channel has a pair of complementary
digital outputs, DATAn and DATANn, which can be connected to an external high input imped-
ance amplifier.
The output DATAn and DATANn should be as ideal as possible before filtering, to achieve the
best SNR and THD quality. The outputs can be connected to a class D amplifier output stage to
drive a speaker directly, or it can be low pass filtered and connected to a high input impedance
amplifier. A simple 1st order low pass filter that filters all the frequencies above 50kHz should be
adequate when applying the signal to a speaker or a bandlimited amplifier, as the speaker or
amplifier will act as a filter and remove high frequency components from the signal. In some
cases high frequency components might be folded down into the audible range, and in that case
a higher order filter is required. For performance measurements on digital equipment a minimum
of 4th order low pass filter should be used. This is to prevent aliasing in the measurements.
For the best performance when not using a class D amplifier approach, the two outputs DATAn
and DATANn, should be applied to a differential stage amplifier, as this will increase the SNR
and THD.
Digital Stereo DAC
Oversampled D/A conversion architecture
Digital bitstream outputs
Parallel interface
Connected to DMA Controller for background transfer without CPU intervention
– Oversampling ratio fixed 128x
– FIR equalization filter
– Digital interpolation filter: Comb4
– 3rd Order Sigma-Delta D/A converters
AT32UC3B
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