ucb1200 NXP Semiconductors, ucb1200 Datasheet - Page 23

• Manufacturer Part Number: ucb1200
• Description: Advanced Modem/audio Analog Front-end
• Manufacturer: NXP Semiconductors

Philips Semiconductors
The applied voltage on the four analog inputs of the UCB1200 (AD0 - AD3) is attenuated before it is applied to the ADC
input multiplexer using on chip resistive dividers.These high voltage inputs are optimized to handle voltages larger than
the applied supply voltage. The built-in resistive voltage dividers are only activated if the corresponding analog input is
selected. The resistive dividers are made floating when the input is not selected by the ADC input multiplexer, such that
the input leakage of these high voltage analog pins is minimized. This makes these analog inputs very suitable to monitor
battery voltage voltages.
1998 Jul 22
Advanced modem/audio analog front-end
AD[n]
Fig.18 Block diagram of resistive dividers AD0 - AD3.
MUX
adc
input
23
ADC_INPUT[n]
Product specification
UCB1200