Data Sheet

• PLL Lock Time: <50us

• Selectable Data Filter: up to 20kHz

• Internal Trim Function:

o

TX power (-3 to +12dBm)

o

Antenna impedance match (two independent channels)

o

Xtal for frequency and Quick Start

o

RC oscillator frequency

o

Sniff Mode for data threshold

o

Data slice

• Clock and Data Recovery (reduced Data jitter)

• Serial Interface: Data input/output

• Low Frequency IF

• Internal IF Filtering

• Package: 20-lead, 209mm SSOP

4.0 Functional Block Diagram

The AMIS-52100 is a dual channel receiver and a transmitter in a single small outline package. The receiver provides two independent

receive channels with the signals combined in the data detection circuit. Summing the signals allows the two channels to be used for

antenna diversity without complex protocols to select the strongest channel. The AMIS-52100 can be programmed to be a single

channel or a dual channel receiver. There are internal trim functions for the RF receiver frequency, tuning each input port, setting the

internal filters to match the data rate, and to set the threshold level for acquiring an incoming signal. The receiver converts the received

RF signal to a low frequency IF. An RSSI circuit determines the strength of the received signal. A level detector samples the RSSI

signal level and compares that level to the slice threshold to recover data. The slice threshold can either be set to a fixed level or the

AMIS-52100 can determine the threshold level from the incoming data.

The transmitter is a high efficiency PA that is simply turned on or off by the serial data. The output power level is adjustable. The

frequency of the RF output can be tuned with an internal crystal trim function that allows the AMIS-52100 to abide component and

manufacturing tolerances. There are a number of unique circuit features. The AMIS-52100 can be placed in a very low power state with

the crystal oscillator off and a low power RC oscillator maintaining operations. There is an application wakeup mode where the AMIS-

52100 “sleeps” until either the application wakeup timer wakes the device or an external controller wakes the device. The receiver can

be used in a low power Sniff Mode where the AMIS-52100 is programmed to wake at times to “sniff” for received RF signals and then

return to “sleep” if a signal is not detected. The AMIS-52100 contains a Quick Start circuit that allows the crystal oscillator to return to

full operation in an extremely short time which allows the AMIS-52100 to consume much less power than comparable products. The

AMIS-52100 uses a programmable PLL to synchronize a data clock to the received data. This circuit can remove much of the jitter on

the data signal.

These functions will be described in more detail later in this document.

2

AMI Semiconductor – Rev 4.0, Mar. 06 – M-20535-004

www.amis.com