SPM and Security Subsystem
FX651
Package
D4
Pin No.
10
Name
AMPOP
Signal
Type
O/P
Description
The input amplifier's output. External
components are used in conjunction with the
amplifier to couple the line signal into the device.
Both inputs are available to allow a differential
configuration because a two wire input is
assumed.
The input amplifier's inverting input.
The input amplifier's non inverting input.
The logic output of the 18kHz channel which is
active in Rx mode. Logic "0" signals the
presence on the line of 18kHz tone within
specified frequency and amplitude limits.
The logic output of the 12kHz channel. It goes
to logic "0" when a 12kHz tone within specified
frequency and amplitude limits has been
detected for a minimum length of time.
The positive supply rail. Levels and voltages are
dependent upon this supply. This pin should be
decoupled to V
SS
by a capacitor
(see Figure 1).
No internal connection: leave open circuit.
11
12
13
NEGIP
POSIP
DETECT
18kHz
I/P
I/P
O/P
14
DETECT
12kHz
O/P
16
V
DD
POWER
3, 15
N/C
Notes:
I/P =
O/P =
Input
Output
©
1997 Consumer Microcircuits Limited
5
D/651/4
CMLMICRO [ CML MICROCIRCUITS ]
