MAS9178 MAS, MAS9178 Datasheet - Page 6

• Manufacturer Part Number: MAS9178
• Description: Stand-alone am Receiver ic
• Manufacturer: MAS

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DA9178.000
22 Apr, 2003
TYPICAL APPLICATION (Continued)
Note 3: Power Down / Fast Startup Control
Both power down and fast startup are controlled using the PDN pin. The device is in power down (turned off) if
PDN = VDD and in power up (turned on) if PDN = VSS. Fast startup is triggered by the falling edge of PDN
signal, i.e., controlling device from power down to power up. The startup time without using the fast startup
control can be several minutes but with fast startup it is shortened typically to 12 s.
Note 4: Optional Control for AGC On/Hold
AON control pin has internal pull up which turns AGC circuit on all the time if AON pin is left unconnected.
Optionally AON control can be used to hold and release AGC circuit. Stepper motor drive etc. can produce
disturbing amount of noise which can shift the input amplifier gain to unoptimal level. This can be avoided by
controlling AGC hold (AON=VSS) during stepper motor drive periods and releasing AGC (AON=VDD) when
motors are not driven.
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