ml2722 Sirenza Microdevices, ml2722 Datasheet - Page 12

• Manufacturer Part Number: ml2722
• Description: 900mhz Low-if 1.5mbps Fsk Transceiver
• Manufacturer: Sirenza Microdevices

DS2722-F-06
SERIAL BUS SIGNALS
15
26
28
4
5
6
VTUNE
VBG
RSSI/TPI
EN
DATA
CLK
I (CMOS)
I (CMOS)
I (CMOS)
O
O
I
Enable pin for the three-wire serial
VCO Tuning Voltage input from the PLL
loop filter. This pin is very sensitive to
noise coupling and leakage currents.
Internal Bandgap Reference Voltage.
Decoupled to ground with a 220nF
capacitor.
Buffered Analog RSSI output with a
nominal sensitivity of 35mV/dB. An RF
input signal range of –95 to –20 dBm
gives an RSSI voltage output of zero to
2.7 V.
control bus that sets the operating
frequency and programmable options.
The control registers are loaded on a
low-to-high transition of the signal. Serial
control bus data is ignored when this
signal is high. This is a CMOS input, and
the thresholds are referenced to VDD
and VSS.
Serial Control Bus Data. 16-bit words,
which include programming data and the
two-bit address of a control register. This
is a CMOS input, and the thresholds are
referenced to VDD and VSS.
Serial control bus data is clocked in on
the rising edge when EN is low. This is a
CMOS input; the thresholds are
referenced to VDD and VSS.
FINAL DATASHEET
DATA
VTUNE
VTUNE
CLK
EN
4
5
6
RSSI
OP
AMP
15
15
VDD
VSS
31
8
MUX
MUX
RSSI
TPI
5.5k
VCC2
VCC2
VSS
VSS
13
13
8
8
DECEMBER 2005
100 Ω
3.7k
3.7k
1.7p
ML2722
VCC5
VSS
24
8
1.25V
1.25V
28 RSSI/TPI
12