DF3048X16V Renesas Electronics America, DF3048X16V Datasheet - Page 580

• Manufacturer Part Number: DF3048X16V
• Description: MCU 5V 128K,PB-FREE 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300Hr

Specifications of DF3048X16V

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 16MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Section 15 A/D Converter
8. Allowable Signal-Source Impedance: The analog inputs of the H8/3048 Group are designed to
Rev. 7.00 Sep 21, 2005 page 554 of 878
REJ09B0259-0700
assure accurate conversion of input signals with a signal-source impedance not exceeding 10
k . The reason for this rating is that it enables the input capacitor in the sample-and-hold
circuit in the A/D converter to charge within the sampling time. If the sensor output impedance
exceeds 10 k , charging may be inadequate and the accuracy of A/D conversion cannot be
guaranteed.
If a large external capacitor is provided in scan mode, then the internal 10-k input resistance
becomes the only significant load on the input. In this case the impedance of the signal source
is not a problem.
A large external capacitor, however, acts as a low-pass filter. This may make it impossible to
track analog signals with high dv/dt (e.g. a variation of 5 mV/µs) (figure 15.11). To convert
high-speed analog signals or to use scan mode, insert a low-impedance buffer.
Figure 15.10 A/D Converter Accuracy Definitions (2)
Digital
output
characteristic
conversion
Ideal A/D
Offset error
Actual A/D conversion
characteristic
Nonlinearity
error
Analog input
voltage
Full-scale
error
FS