Baseband Processor For Mixed Mode Land Mobile Radio
CMX880
AC Parameters (cont.)
Notes
Min.
Typ.
Max.
Units
Auxiliary RSSI Monitor
8 Bit ADC Mode
Resolution
8
Bits
V
ms
Input Range
Conversion time
41
42
VSS(A)
VDD(A)
12.5
Input impedance
Resistance
Capacitance
10
5
MW
pF
Zero error
ü
þ
(input offset to give ADC output = 0)
Input rate of change
Integral Non-linearity
Differential Non-linearity
Source output impedance
- 20
+20
1.1
2.0
1.0
24
mV
mV/µs
LSB
LSB
kW
43
44
45
Level Threshold Detect Mode
Threshold Resolution
Upper threshold range (VTH)
Lower threshold range (VTL)
RSSI change to IRQ
8
Bits
V
V
ms
ms
46
46
47
48
VTL
VSS(A)
VDD(A)
VTH
120
RSSI change to Receiver-Turn-On
60
Notes:
41.
42
At VDD = 5.0V only. Signal levels and currents are proportional to VDD.
With clock frequency of 15.36MHz. Conversion time is dependent on A-to-D clock
frequency.
43.
44.
45.
Linear rate of change of input to ensure < 1 bit error.
Guaranteed monotonic with no missing codes.
Denotes output impedance of the driver of the RSSI input, to ensure < 1 bit
additional error under nominal conditions.
46.
47.
Upper threshold > Lower threshold
Time from RSSI rising above Upper Threshold or falling below Lower Threshold, to
IRQN being asserted.
48.
Time from RSSI rising above Upper Threshold to receiver path powering up,
settling and starting automatic signal type identification.
ã 2001 Consumer Microcircuits Limited
72
D/880/1
CMLMICRO [ CML MICROCIRCUITS ]
