NTE1859
Integrated Circuit
dbx TV Noise Reduction Integrated Circuit
Description:
The NTE1859 is an integrated circuit designed for the dbx–TV noise reduction decode circuit for multi-
channel TV sound systems. This device contains a voltage controlled amplifier, a variable de–empha-
sis circuit with new configuration and RMS detectors with completely integrated active band pass fil-
ters, and offers the complete dbx–TV noise reduction decoder only with a few external components.
Features:
DIntegrated Band Pass Filters using Active Filtering Technique and Thin Film Structure with
High Capacitance
DVariable De–emphasis Circuit with New Circuit Configuration
DMinimum Number of External Components
DWide Operation Voltage Range: 4.7V to 16V
Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
Power Supply Voltage, VCC 17V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Allowable Power Dissipation, PD715mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range, Topr –20° to +75°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, Tstg –55° to +150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Operating Voltage:
Power Supply Voltage, VCC 5V to 15V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics: (TA = +25°C, VCC = +9V Reference Level: 0dB = –5dBm (436mVrms)
unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Unit
Consumption Current ICC No Signal 4.0 5.0 6.3 mA
Decode Characteristics Vod–1 Vi = –5dB, f = 300Hz 5.5 7.0 8.5 dB
Vod–2 Vi = –15dB, f = 300Hz –14.5 –13.0 –11.5 dB
Vod–3 Vi = –30dB, f = 300Hz –44.5 –43.0 –41.5 dB
Vod–4 Vi = 0dB, f = 1kHz 1.3 3.3 5.3 dB
Vod–5 Vi = –10dB, f = 1kHz –19.4 –17.4 –15.4 dB
Vod–6 Vi = –20dB, f = 1kHz –39.6 –37.6 –35.6 dB
Vod–7 Vi = 0dB, f = 8kHz –4.3 –1.8 0.7 dB
Vod–8 Vi = –10dB, f = 8kHz –30.9 –28.4 –25.9 dB
Vod–9 Vi = –20dB, f = 8kHz –45.2 –42.7 –40.2 dB
Electrical Characteristics (Cont’d): (TA = +25°C, VCC = +9V Reference Level: 0dB = –5dBm
(436mV rms) unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Unit
VCA Filter Characteristics Vfp–1f = 3kHz, Vi = 0dB, refer to 1kHz –5.5 –4.0 –2.5 dB
Vfp–2f = 8kHz, Vi = 0dB, refer to 1kHz –13.0 –11.0 –9.0 dB
Vemp. Filter Characteristics Vfg–1f = 5kHz, Vi = 0dB, refer to 8kHz –9.4 –7.4 –5.4 dB
Vfg–2f = 2kHz, Vi = 0dB, refer to 8kHz –32.3 –28.8 –25.3 dB
Total Harmonic Distortion Ratio THD f = 1kHz, Vi = –3dB –0.1 0.3 %
Maximum Output Voltage Vom–1f = 300Hz, THD = 1.5% 11.0 12.5 –dB
Vom–2f = 8kHz, THD = 1.5% –2.0 1.0 –dB
Output Noise Level Von A weight – –104 –80 dB
Timing Current Itime (7.1) 7.5 (7.9) µA
Center Potential VCC/2 4.3 4.5 4.7 V
Electrical Characteristics: (TA = +25°C, VCC = +9V Reference Level: 0dB = –5dBm (436mVrms)
Note 1 unless otherwise specified)
Switch Condition
Parameter Symbol 1 2 3 4 5 6 7
Consumption Current ICC OFF ––––b b
Decoding Characteristics
300Hz, –5dB Vod–1 ON –b b b b b
300Hz, –15dB Vod–2 ON –b b b b b
300Hz, –30dB Vod–3 ON –b b b b b
1kHz, 0dB Vod–4 ON –b b b b b
1kHz, –10dB Vod–5 ON –b b b b b
1kHz, –20dB Vod–6 ON –b b b b b
8kHz, 0dB Vod–7 ON –b b b b b
8kHz, –10dB Vod–8 ON –b b b b b
8kHz, –15dB Vod–9 ON –b b b b b
VCA Filter Characteristics
3kHz Vfp–1 ON a a b b b b
8kHz Vfp–2 ON a a b b b b
Vemp Filter Characteristics
5kHz Vfg–1 ON b a b b b b
2kHz Vfg–2 ON b a b b b b
Total Harmonic Distortion Ratio THD ON –b b b b b
Maximum Output Voltage
300Hz Vom–1 ON –b b b b b
8kHz Vom–2 ON –b b b b b
Output Noise Level Von OFF –b a a b b
Middle Point Potential VCC/2 OFF ––––b b
Note 1. It suffices that a or b is inserted into (–).
VCC 1
VCC 2
Pin Connection Diagram
.260 (6.6) Max
16 9
18
.785 (19.9) Max
.200 (5.08)
Max
.245
(6.22)
Min
.300 (7.62)
.700 (17.7)
.100 (2.54)
VE WGTVE TC
VCA FB
VCA TC
GND
VCA WGT
Time VE Output
REF
VCA Output
VCA Input
VE INT
Detector Input
1
2
3
4
5
6
7
8
16
15
14
13
VE Input
12
11
10
9
