AMIS-52000 Datasheet, PDF (7/15 Pages) AMI SEMICONDUCTOR – Single-Chip Radio Transceiver

AMIS-52000 Single-Chip Radio Transceiver
Data Sheet
VDD, Supply Voltage
The VDD pin is the supply voltage for the AMIS-52000
circuits other than the RF output. It is typically 3.0V DC.
Please refer to section “Operating and Maximum
Specifications” of this specification for operating conditions.
GND, Analog/Digital Ground
The GND pin is a ground connection for all non-RF circuitry.
Table 12: Crystal Divider Control
Reg
0x03
0x04
Name
TX Crystal Trim
RX Crystal Trim
Register Function
Changing the value of
this changes the crystal frequency
Changing the value of
this changes the crystal frequency
NOTE:
The value of the external crystal load capacitors should be slightly
lower than for a typical crystal to allow for capacitor loading in the
trim function.
LPFILT, Loop Filter
The LPFILT pin connects the AMIS-52000 internal PLL
comparator to the external loop filter. The filter is required
to allow the internal PLL to lock to the crystal frequency
while producing the desired RF frequency. A simple second
order RC loop filter is typically sufficient for this purpose.
VCO1, VCO2, Voltage Controlled Oscillator Tune
The VCO1 and VCO2 pins connect a parallel capacitor
and inductor to the AMIS-52000 internal VCO (Voltage
RFGND, RF Ground
The RFGND pin is a ground connection for all the internal RF
circuitry.
X1, X2, Crystal Oscillator
X1 and X2 connect a parallel resonance oscillator crystal and
capacitors to the AMIS-52000. The AMIS-52000 is designed
with an internal trim function that is controlled by writing to
the AMIS-52000 registers.
Controlled Oscillator). The LC circuit tunes the VCO
frequency. The frequency of the VCO is twice the desired
TX or RX frequency and the range of the VCO is 520MHz to
1400MHz.
CLKOUT, Internal Clock Output
The CLKOUT pin output is either the internal RC oscillator,
the crystal oscillator, or a divided version of the crystal
oscillator.
Table 13: Crystal Divider Control TX/RX Pin Definition Control (Registers 0x05 and 0x08)
Register
Register
0x05
Register
0x08
Register
0x0F
BIT
7
4&5
0&1
Bit Name
CLKOUT
Enable
CLKOUT
Output
Select
CLKOUT
Frequency
Select
Bit State
0
1
00
01
10
11
00
01
10
11
Comments
CLKOUT is enabled
CLKOUT is disabled
Automatic control
RC oscillator is output
Xtal oscillator is output
CLKOUT output is off
Divide crystal by 4
Divide crystal by 3
Divide crystal by 2
Divide crystal by 1
CREF, Current Reference Bias
The CREF pin requires a resistor to ground to set the
bandgap BIAS CURRENT. IT IS CRITICAL THAT THE
RESISTOR BE 33.2K OHMS, 1% or better tolerance.
R(Bias) = 33.2 KΩ (1%)
I²CDATA, I²CCLK, I²C Control Interface Bus
2
The AMIS-52000 implements an I C serial 8 bit bi-directional
2
2
2
interface with the pins I CDATA and I CCLK. The I C bus
handshaking and protocol is implemented for a SLAVE
device. Because only a minimal configuration is supported,
clock stretching for slow peripherals, general call
addressing, and ten-bit extended addressing are not
implemented. The interface will support either normal (0 -
100 Kbits/second) or fast (0 - 400 Kbits/second) data
modes. The interface conforms to the Phillips specification
2
for the I C bus.
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