L64724 LSI Logic Corporation, L64724 Datasheet - Page 28

• Manufacturer Part Number: L64724
• Description: Satellite Receiver
• Manufacturer: LSI Logic Corporation

2.8 Microcontroller Interface
2-8
ADCVDDI/Q
ADCVREFI
ADCVREFNI
ADCVREFQ
ADCREFNQ
ADCVSSI/Q
IBIAS
QBIAS
The Microcontroller Interface connects the L64724 to a microcontroller
such as the 64008.
A[2:0]
L64724 Signal Definitions
ADC Power
ADCVDDI/Q are the analog power supply pins for the
ADC module and are normally connected to the system
power (V
ADC I Reference
This pin supplies VDD to the internal reference generator.
ADC Negative I Reference
This pin supplies VREFN to the internal ADC cells.
ADC Q Reference
This pin is not used and should be left unconnected. Any
other connection will cause unpredictable and unreliable
operation of the device.
ADC Negative Q Reference
This pin supplies the ground to the internal ADC cell.
ADC Analog Ground
ADCVSSI/Q are the analog ground pins for the ADC
module and are normally connected to the system
ground plane.
Current Bias I
The IBIAS pin supplies the current bias for the ADCs.
Current Bias Q
This pin is used by LSI Logic for internal purposes, and
should be connected as shown in Figure D.2. Any other
connection will cause unpredictable and unreliable
operation of the device.
Address
The A[2:0] signals form the receiver address bus. The
address bus is used in conjunction with an 8-bit data bus
D[7:0], a read/write strobe (READ/WRITE), a chip select
strobe (CS), and an address strobe (AS) to select, read,
and write internal registers.
DD
) plane.
Input
Input
Input
Input
Input
Input
Input
Input
Input