NE5900 Philipss, NE5900 Datasheet - Page 3

• Manufacturer Part Number: NE5900
• Description: Call progress decoder
• Manufacturer: Philipss

1. 0dB = 0.775V
2. By design; not tested.
Philips Semiconductors
DC ELECTRICAL CHARACTERISTICS
V
NOTE:
The NE5900 uses the signal in the call progress tone passband and
the cadence of interrupt rate of the signal to determine which call
progress tone is present.
Figure 3 shows a detailed block diagram of the NE5900.
The signal input from the phone line is coupled through a 470k
resistor which, together with two internal capacitors and an internal
resistor, form an anti-aliasing filter. This passive low pass filter
strongly rejects AM radio interference. Insertion loss is typically
1.5dB at 460Hz. The 470k resistor also provides protection from
the transients. The input (Pin 1) DC voltage can be derived from
V
capacitor (10nF minimum).
Following this is a switched capacitor bandpass filter which accepts
call progress tones and inhibits tones not in the call progress band
of 300Hz to 630Hz. The bandpass limits are determined by the
1986 May 8
SYMBOL
SYMBOL
CC
REF
Call progress decoder
V
R
V
V
V
V
V
V
V
I
= +3.3V, T
I
I
OZ
REF
REF
DD
IH
OH
IL
OL
IH
IH
(Pin 2) or allowed to self-bias through a series coupling
IL
IL
Power supply voltage
Quiescent current
Input threshold
Signal rejection
Low frequency
High frequency
Logic 1 level
Logic 0 level
Logic 1 input current
Logic 0 input current
Logic 1 input voltage
Logic 0 input voltage
Logic 0 output voltage
Logic 1 output voltage
Tri-state leakage
Filter output gain
Filter frequency response
Input impedance
Reference voltage
Reference resistance
Envelope response time
A
RMS
= 25 C; unless otherwise stated.
PARAMETER
PARAMETER
2
2
rejection
rejection
As above from 300Hz to 630Hz, refer-
460Hz – 20dB (V
Time from removal or application of
V
V
V
V
Pin 1 level, frequency = 460Hz,
Pin 1 level, frequency = 300Hz,
As above with no output loads
DD
Pin 3 External Clock In/XTAL
Pin 3 External Clock In/XTAL
DD
DC
DC
Pin 1, frequency = 460MHz
Pin 1 frequency, 0dB max.,
Pin 1 frequency, 0dB max.,
Input Pin 1, 460Hz – 20dB,
V
DC
= V
Pins 7, 9, 10, 11, 12, 13
Pins 7, 9, 10, 11, 12, 13
= V
= V
= V
to response of Pin 13
TEST CONDITIONS
TEST CONDITIONS
Pins 3, 6, 14 = V
Pins 10, 11, 12, 13,
V
Pins 3, 6, 14 = 0V
I
= V
REF
SOURCE
enced to 460Hz
Pin 2, V
REF
REF
REF
OUT
I
R
Pin 14 = V
Pin 5, 6 = 0V
SINK
Pin 14 = 0V
LOAD
REF
Pins 6, 14
Pins 6, 14
Output Pin 13 = V
Pin 16
Output Pin 13 = 0V
Output Pin 13 = 0V
Output Pin 13 = 0V
= V
Pin 2
3
= 1.6mA
DC
Output Pin 15,
DD
= 0.5mA
= 1M
DD
= V
input clock frequency of 3.58MHz. An on-board inverter between
Pins 3 and 4 can be used either as a crystal oscillator or as a buffer
for an external 3.58MHz clock signal. The switched capacitor filters
provide typical rejection of greater than 40dB for frequencies below
120Hz and above 1.6kHz.
The decoder responds to signals between 300Hz and 630Hz with a
threshold of -39dB typical (0dB = 0.775V
respond to any signal below -50dB or to tones up to 0dB which are
below 180Hz or above 800Hz. Dropouts of 20ms or bursts of only
20ms duration are ignored. A gap of 40ms or a valid tone of 40ms is
detected.
The buffered output of the switched capacitor filter is available at the
analog output, Pin 15. A logic output representing the detected
envelope of this signal is available at the envelope output, Pin 13.
= 5V
or 0V
DD
REF
DD
on Pin 1)
DD
V
V
DD
DD
MIN
800
-1.0
-1.0
-3.0
-1.0
4.5
2.0
6.5
2.4
0
0
0
1
– 0.4
– 1
LIMITS
TYP
5.0
2.0
-39
8.5
2.5
38
5
RMS
). The decoder will not
Product specification
MAX
10.5
V
V
180
5.5
4.0
-35
-50
0.8
1.0
1.0
1.0
0.4
3.0
1.0
2.6
15
NE5900
DD
DD
UNITS
UNITS
dBmo
dB
dB
mA
M
Hz
Hz
dB
ms
V
V
V
V
V
V
V
V
A
A
A
1
1