AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 545

• Manufacturer Part Number: AT91SAM7S256D-AU
• Description: ARM Microcontrollers - MCU 256K Flash SRAM 64K ARM based MCU
• Manufacturer: Atmel
• Series: SAM7S256r

Specifications of AT91SAM7S256D-AU

• Rohs: yes
• Core: ARM
• Processor Series: AT91SAM
• Data Bus Width: 16 bit/32 bit
• Maximum Clock Frequency: 55 MHz
• Program Memory Size: 256 KB
• Data Ram Size: 64 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 3 V to 3.6 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: LQFP-64
• Mounting Style: SMD/SMT
• Interface Type: 2-Wire, I2S, SPI, USART
• Length: 7 mm

36.5.7
ADC Timings
Each ADC has its own minimal Startup Time that is programmed through the field STARTUP in the Mode Register
ADC_MR.
In the same way, a minimal Sample and Hold Time is necessary for the ADC to guarantee the best converted final
value between two channels selection. This time has to be programmed through the bitfield SHTIM in the Mode
Register ADC_MR.
Warning: No input buffer amplifier to isolate the source is included in the ADC. This must be taken into consider-
ation to program a precise value in the SHTIM field. See the section, ADC Characteristics in the product datasheet.
SAM7S Series [DATASHEET]
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6175M–ATARM–26-Oct-12