7221

NTE7221
Integrated Circuit
Dual 5W Audio Power Amp
w/Stand−By & Volume Function
Description:
The NTE7221 is an integrated circuit in a 12−Lead SIP type package. This BTL 5W/Ch Power Amplifier
has both stand−by and volume functions which make it an excellant choice for lo frequency amplifier
applications.
Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
Supply Voltage (At No Signal), VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.4V
Supply Current, ICC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.0A
Power Dissipation (TA = +70°C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.92W
Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −25° to +70°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55° to +150°C
Electrical Characteristics: (VCC = 8V, f = 1kHz, RL = 8Ω, TA = +25°C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Quiescent Circui Current
ICQ
Vin = 0V, VO1 = 0V
−
45
100
mA
Stand−By Current
ISTB
Vin = 0V, VO1 = 0V
−
1
10
μA
Output Noise Voltage
VNO
Rg = 10kΩ, VO1 = 0V, Note 1
−
0.1
0.4
mVrms
Voltage Gain
GV
PO = 0.5W, VO1 = 1.25V
31
33
35
dB
Total Harmonic Distortion
THD
PO = 0.5W, VO1 = 1.25V
−
0.1
0.5
%
Maximum Power Output
PO
THD = 10%, VO1 = 1.25V
2.4
3.0
−
W
VCC = 11V, THD = 10%, VO1 = 1.25V
4.0
5.0
−
W
30
50
−
dB
−250
0
250
mV
Ripple Rejection Ratio
RR
Rg = 10kΩ, VO1 = 0V, Vr = 0.5Vrms,
f = 120Hz, Note 1
Output Offset Voltage
Voff
Rg = 10kΩ, VO1 = 0V
Volume Attenuation Ratio
Att
PO = 0.5W, VO1 = 0V, Note 1
70
85
−
dB
Channel Balance
CB
PO = 0.5W, VO1 = 1.25V
−1
0
1
dB
PO = 0.5W, VO1 = 0.6V
−2
0
2
dB
GVm
PO = 0.5W, VO1 = 0.6V
20.5
CT
PO = 0.5W, VO1 = 1.25V
40
55
−
dB
Middle Voltage Gain
Channel Crosstalk
23.5 26.5
dB
Stand−By Pin Current
ISTB2
Vin = 0V, VSTB = 3V
−
−
25
μA
Volume Pin Current
IVOL
Vin = 0V, VO1 = 0V
−12
−
−
μA
Vin = ±0.3VDC
24
30
36
kΩ
Input Impedance
Zi
Note 1. For this measurement, use the BPF = 15Hz to 30kHz (12dB/OCT)
Pin Connection Diagram
(Front View)
12
11
10
9
8
7
6
5
4
3
2
1
Ch 2 Output (+)
GND (Ch 2 Output)
Ch 2 Output (−)
Volume
Ch 1 Input
GND (Input)
Ch 1 Input
Stand−By
Ch 1 Output (−)
GND (Ch 1 Output)
Ch 1 Output (+)
VCC
1.179 (29.96)
.138
(3.5)
1.102 (28.0)
.071 (1.8) R
.142 (3.6) Dia
.252
(6.4)
.303
(7.7)
1
12
.100 (2.54)
.307
(7.8)