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PDF NCS2632 Data sheet ( Hoja de datos )
| Número de pieza | NCS2632 | |
| Descripción | Pop-Free 3 VRMS Audio Line Driver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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NCS2632
NOCAP], Pop-Free, 3 VRMS
Audio Line Driver with
Adjustable Gain
The NCS2632 is a pop −free stereo line driver . It uses
ON Semiconductor’s patented NOCAP technology which allows the
elimination of the external DC −blocking capacitors by providing
ground−referenced outputs through the generation of an internal
negative supply rail. The device can drive 3 VRMS into a 600 W load at
5 V power supply . By eliminating the two external heavy coupling
capacitors, the NOCAP approach of fers significant space and cost
savings compared to similar audio solutions.
The NCS2632 has dif ferential inputs and is available with an
external adjustable gain ranging from ±1 V/V to ±10 V/V. The gain is
adjusted with external resistors. The device can also be configured as a
2nd order low pass filter to complement DAC’s and SOC converters.
In addition to the NOCAP architecture, it contains specific circuitry to
prevent “Pop & Click” noise from occurring during Enable /
Shutdown transitions. The Signal-to-Noise Ratio reaches 105 dB,
offering high fidelity audio sound. The NCS2632 exhibits a high
power supply rejection with a typical value of 90 dB. This device also
features an Under−Voltage Protection (UVP) function which can be
adjusted using an external resistor bridge. The device is available in a
TSSOP−14 package.
http://onsemi.com
MARKING
DIAGRAM
14
1
TSSOP−14
CASE 948G
14
NCS
2632
ALYWG
G
1
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
(*Note: Microdot may be in either location)
*For additional marking information, refer to
Application Note AND8473/D.
Features
• NOCAP
♦ Eliminates Pop/Clicks
♦ Eliminates Output DC−Blocking Capacitors –
Provides Flat Frequency Response 20 Hz – 20 kHz
• Supply Voltage from 2.2 V to 5.5 V
• Low Noise and THD
♦ SNR = 105 dB
♦ Typical Vn at 8 mVrms, A−Weighted
♦ THD+N < 0.001% at 1 kHz
• Output Voltage into 600 W Load
♦ 2 VRMS with 3.3 V Supply Voltage
♦ 3 VRMS with 5 V Supply Voltage
• Adjustable Gain from ± 1 V/V to ± 10 V/V
• Differential Input
• High PSRR: 90 dB
• External Under−Voltage Detection Function
• Enhanced Pop & Click Suppression Function
• Offset Voltage ≤ ±400 mV
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
• Outputs pass ±8 kV contact discharge according to
IEC61000−4−2 under application conditions
• Available in a TSSOP−14 package
• These Devices are Pb−Free, Halogen Free/BFR Free
and are RoHS Compliant
Applications
• Set−Top Boxes
• PDP / LCD TV
• Blu−ray™ Player, DVD Players
• Home Theater in a Box
• Laptops, Notebook PCs
© Semiconductor Components Industries, LLC, 2013
October, 2013 − Rev. 4
1
Publication Order Number:
NCS2632/D
http://www.Datasheet4U.com
1 page  
NCS2632
TYPICAL CHARACTERISTICS
VDD = 3.3 V, TA = 25°C, RL = 2.5 kW, CVSS = 1 mF, CIN = 10 mF, RIN = 10 kW, Rfb = 20 kW (unless otherwise noted)
10
−40°C
25°C
1 85°C
125°C
10
−40°C
25°C
1 85°C
125°C
0.1 0.1
0.01 0.01
0.001
0.001
0.0001
0.01 0.1 1 10
VOUT (V)
Figure 3. THD+N vs. Output Voltage over
Temperature, RL = 2.5 kW, VDD = 3.3 V, f = 1 kHz
10
VDD = 2.0 V
VDD = 3.0 V
1 VDD = 3.3 V
VDD = 4.0 V
VDD = 4.2 V
0.1 VDD = 5.0 V
VDD = 5.5 V
0.01
0.0001
0.01 0.1 1 10
VOUT (V)
Figure 4. THD+N vs. Output Voltage over
Temperature, RL = 2.5 kW, VDD = 5 V, f = 1 kHz
10
VDD = 2.2 V
1
VDD = 3.0 V
VDD = 3.3 V
VDD = 3.6 V
0.1
VDD = 4.2 V
VDD = 5.0 V
VDD = 5.5 V
0.01
0.001
0.001
0.0001
0.01
0.1
1
0.0001
10 0.01
0.1
1 10
VOUT (V)
Figure 5. THD+N vs. Output Voltage over
Supply, RL = 2.5 kW, f = 1 kHz
VOUT (V)
Figure 6. THD+N vs. Output Voltage over
Supply, RL = 600 W, f = 1 kHz
0.1
VDD = 5 V, VOUT = 3 V
VDD = 3.3 V, VOUT = 2 V
VDD = 2.2 V, VOUT = 1.4 V
0.1
VDD = 3.3 V, VOUT = 2.2 V
VDD = 5 V, VOUT = 3.3 V
0.01 0.01
0.001
0.001
0.0001
20
200
2000
20,000
FREQUENCY (Hz)
Figure 7. THD+N vs. Frequency, RL = 2.5 kW
0.0001
20
200
2000
20,000
FREQUENCY (Hz)
Figure 8. THD+N vs. Frequency, RL = 600 W
http://onsemi.com
5
5 Page 
NCS2632
Table 1. RECOMMENDED RESISTOR VALUES
Input Resistor Val-
ue, RIN
Feedback Resistor Val-
ue, RFB
Differential Input Gain
22 kW
22 kW
1.0 V/V
22 kW
33 kW
1.5 V/V
33 kW
68 kW
2.06 V/V
10 kW
100 kW
10.0 V/V
Inverting Input Gain
–1.0 V/V
–1.5 V/V
–2.06 V/V
–10.0 V/V
Non Inverting Input
Gain
2.0 V/V
2.5 V/V
3.1 V/V
11.0 V/V
INPUT CAPACITOR
The input coupling capacitor blocks the DC voltage at the
amplifier input terminal. This capacitor creates a high−pass
filter with RIN. The size of the capacitor must be lar ge
enough to couple at low frequencies without severe
attenuation in the audio bandwidth (20 Hz − 20 kHz).
The cut off frequency for the input high−pass filter is:
fc
+
1
2pRinCin
(eq. 12)
A fc < 20 Hz is recommended.
CHARGE PUMP CAPACITOR SELECTION
It is recommended to use ceramic capacitors with low
ESR for better performances. X5R or X7R capacitors are
recommended. The flying capacitor C fly (1 mF) serves to
transfer char ge during the generation of the negative
voltage. The VSS reservoir capacitor CVSS must be equal at
least to the Cfly capacitor to allow maximum charge transfer.
The 1 mF capacitors have to be connected as close as
possible to the corresponding pins.
Lower value capacitors can be used but the device may not
operate to specifications.
POWER SUPPLY DECOUPLING CAPACITORS
The NCS2632 is a True Ground amplifier that requires an
adequate decoupling capacitor on VDD to reduce noise and
THD+N. Use a X5R / X7R ceramic capacitor and place it
close to the VDD pin. A value of 1mF is recommended. For
filtering lower frequency noise signals, a 10 mF or greater
capacitor placed near the audio power amplifier would also
help.
SHUTDOWN FUNCTION
The device enters shutdown mode when Enable signal is
low. During the shutdown mode, the internal charge pump
is shut down, and the DC quiescent current of the circuit does
not exceed 500 nA. The output is pulled to ground through
a low output impedance of about 40 ohms.
USING THE NCS2632 AS A 2nd ORDER FILTER
Audio DACs can require an external low-pass filter to
remove out-of-band noise. This is possible with the
NCS2632, which can be used as a standard Operational
Amplifier with the advantage of better performances
including “pop & click” noise behavior.
Single-ended and differential topologies can be
implemented. In Figures 25 and 26, a Multiple-FeedBack
(MFB) topoplogy, with differential inputs and single-ended
inputs is shown. The two topologies use AC-Coupling
capacitors (CIN) to block the DC-signal component coming
from the source; they contribute to reducing the output offset
voltage.
RFB
CIN RIN
Vin−
RINT
CINT
CDIFF
Vin+
CIN RIN
RINT
CINT
Vout
RFB
Figure 25. 2nd Order Active Low Pass Filter − Differential Input
http://onsemi.com
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| PDF Descargar | [ Datasheet NCS2632.PDF ] | |
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