Philips Semiconductors
Product specification
Call progress decoder
NE5900
DESCRIPTION
The NE5900 call progress decoder (CPD) is a low cost, low power
CMOS integrated circuit designed to interface with a
microprocessor-controlled smart telephone capable of making
preprogrammed telephone calls. The call progress decoder
information to permit microprocessor decisions whether to initiate,
continue, or terminate calls. A tri-state, 3-bit output code indicates
the presence of dial tone, audible ring-back, busy signal, or re-order
tones.
A front-end bandpass filter is accomplished with switched
capacitors. The bandshaped signal is detected and the cadence is
measured prior to output decoding. In addition to the three data bits,
a buffered bandpass output and envelope output are available. All
logic inputs and outputs can interface with LSTTL, CMOS and
NMOS.
Circuit features include low power consumption and easy
application. Few and inexpensive external components are
required. A typical application requires a 3.58MHz crystal or clock,
470k鈩?resistor, and two bypass capacitors. The NE5900 is effective
where traditional call progress tones, PBX tones, and precision call
progress tones must be correctly interpreted with a single circuit.
PIN CONFIGURATION
D
1
and N Packages
INPUT
VREF
EXT CLOCK IN/XTAL1
XTAL2
TEST IN
CLEAR IN
COUNT IN PROGRESS
0V
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
5V
ANALOG OUT
TRI-STATE ENABLE
ENVELOPE
BIT 1
BIT 2
BIT 3
DATA VALID
TOP VIEW
NOTE:
1. SOL 鈥?Released in large SO package only.
SR01142
Figure 1. Pin Configuration
APPLICATIONS
FEATURES
鈥?/div>
Fully decoded tri-state call progress status output
鈥?/div>
Works with traditional, precision, or PBX call progress tones
鈥?/div>
Low power consumption
鈥?/div>
Low cost 3.58MHz crystal or clock
鈥?/div>
No calibration or adjustment
鈥?/div>
Interfaces with LSTLL, CMOS, NMOS
鈥?/div>
Easy application
ORDERING INFORMATION
DESCRIPTION
16-Pin Plastic Small Outline (SOL) Package
16-Pin Plastic Dual In-Line (DIP) Package
鈥?/div>
Modems
鈥?/div>
PBXs
鈥?/div>
Security equipment
鈥?/div>
Auto dialers
鈥?/div>
Answering machines
鈥?/div>
Remote diagnostics
鈥?/div>
Pay telephones
TEMPERATURE RANGE
0 to +70
擄
C
0 to +70
擄
C
ORDER CODE
NE5900DK
NE5900N
DWG #
SOT162-1
SOT38-4
1986 May 8
1
853-0842 83667
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