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PDF RUA631 Data sheet ( Hoja de datos )
| Número de pieza | RUA631 | |
| Descripción | Differential Input Cap-Free Line Driver | |
| Fabricantes | Ruichips | |
| Logotipo |  |
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RUA631
Stereo, Differential Input Cap-Free Line Driver
MOSFET
Features
l Operating Voltage: 3V~3.6V
l Differential Input
l Ground Reference Output
- No Output Capacitor Required (for DC
Blocking)
- Save the PCB Space
- Reduce the BOM Costs
- Improve the Low Frequency Response
l Low Noise and THD+N
- SNR > 108dB
- Noise < 8mVrms
- THD+N < 0.02%at 20Hz~20kHz
l Output Voltage Swing Can Reach 2.1Vrms/Ch
into 2.5kW at VDD=3.3V
l High PSRR: 80dB at 217Hz
l Fast Start-up Time: 500ms
l Integrate the De-Pop Circuitry
l Thermal and Short-Circuit Protection
l Surface-Mount Packaging
- SOP-14
- TSSOP-14
l Lead Free and Green Devices Available
(RoHSCompliant)
General Description
The RUA631 is a stereo, differential input, single supply,
and cap-free line driver, which is available in SOP-14
and
TSSOP-14 packages.
The RUA631 is ground-reference output, and doesn’t
need the output capacitors for DC blocking. The
advantages
of eliminating the output capacitor are saving the
cost, eliminating component height, and improving the
low frequency response.
The external gain setting is recommended using from
±1V/V to ±10V/V. High PSRR provides increased
immunity
to noise and RF rectification. RUA631 has shutdown
and under-voltage detector function for Depop solution.
The RUA631 is capable of driving 2.1Vrms at 3.3V into
2.5kW load, and provides short-circuit and thermal
protection.
Applications
l · Set-Top Boxes
l · CD/DVD Players
l · LCD TVs
l · HTIBs (Home Theater in Box)
Typical application
1 page  
RUC631
GW
VSR
VOS
VN
Tstart-up
PSRR
CL
VESD
Unity Gain Bandwidth
Slew Rate
Output Offset Voltage
Output Noise
Start-up Time
VDD=3.0V to 3.6V, RL = 2.5k
Ri=10k , Rf=10k
Power Supply Rejection Ratio
VDD=3.0V to 3.6V, Vrr=200mVrms
fin= 217Hz fin= 1kHz fin= 20kHz
Maximum Capacitive Load
ESD Protection
OUTR, OUTL
8
-
-5
-
-
-
-
-
10 - MHz
4.5 - V/ s
- 5 mV
8 15 Vrms
500 -
s
-80 -60
-80 -60
-50 -45
220 -
8-
dB
pF
kV
Electrical Characteristics (Cont.)
VDD=3.3V, VGND=VPGND=0V, VSDN=VDD, CCPF=CCPO=1µF, Ci=1µF, RL=2.5kΩ, TA=25oC, Ri=10kΩ,
Rf=20kΩ (unless otherwise noted)
o
Symbol
Parameter
Test Conditions
Min.
RUA631
Typ.
Max.
Output Voltage (Stereo, In
VO Phase)
THD+N=1%, fin=1kHz
RL=2.5k
RL=100k
2.0 2.1
- 2.3
-
Po
Output Power (Stereo, In
Phase)
THD+N=1%, fin=1kHz
RL=32
- 20 -
THD+N
Total Harmonic Distortion Plus
Noise
VO=2Vrms, RL=2.5k fin=20Hz
fin=1kHz fin=20kHz
Po=20mW, RL=32 fin=1kHz
0.01
0.0005
0.01
0.01
0.02
0.001
0.02
0.04
0.03
0.002
0.03
0.05
Crosstalk Channel Separation
S/N
TSD
VUVP
IHY S
Signal to Noise Ratio
Thermal Shutdown Protection
Temperature
External Under Voltage
Detection
External Under Voltage
Detection Hysteresis Current
VO=2Vrms, RL=2.5k fin=20Hz
fin=1kHz
fin=20kHz
VO=2Vrms, RL=2.5k , Ri=10k ,
Rf=10k ,
With A-weighting Filter
UVP FUNCTION
90
90
80
102
-
-
-
100
100
90
108
150
1.25
5.0
110
110
100
114
-
-
-
Unit
V
mW
%
dB
dB
oC
V
A
Copyright© Ruichips Semiconductor Co., Ltd
Rev. A– SEP., 2015
www.ruichips.com
5 Page 
RUC631
Function Description
Line Driver Operation
VO UT
Conventional Line Driver
VOUT
V
DD
VDD/2
GND
V
DD
GND
Shutdown Function
In order to reduce power consumption while not in use,
the RUA631 contains shutdown controllers to externally
turn off the amplifier bias circuitry. This shutdown feature
turns the amplifier off when logic low is placed on the
————
SDN pins for the RUA631. The trigger point between a
logic high is 1.0V and logic low level is 0.35V. It is recom-
mended to switch between ground and the supply volt-
age VDD to provide maximum device performance. By
switching the SDN pins to a low level, the amplifier enters
a low-consumption current circumstance, charge pump
is disabled, and IDD for the RUA631 is in shutdown mode.
In normal operating, the RUA631’s SDN pins should be
pulled to a high level to keep the IC out of the shutdown
mode. The SDN pins should be tied to a definite voltage
to avoid unwanted circumstance changes.
Under-Voltage Protection
VSS
Cap-free Line Driver
Figure 1. Cap-free Operation
The RUA631’s line drivers use a charge pump to invert
the positive power supply (V ) to negative power supply
DD
(VSS), see figure1. The headphone drivers operate at this
bipolar power supply (VDD and VSS) and the outputs refer-
ence refers to the ground. This feature eliminates the
output capacitor that is using in conventional single-ended
headphone drive amplifier. Compare with the single
power supply amplifier, the power supply range has al-
most doubled.
Thermal Protection
The thermal protection circuit limits the junction tempera-
ture of the RUA631. When the junction temperature ex-
ceeds TJ =+150OC, a thermal sensor turns off the driver,
allowing the devices to cool. The thermal sensor allows
the driver to start-up after the junction temperature down
about 125OC. The thermal protection is designed with a
25OC hysteresis to lower the average T during continu-
J
External under voltage detection can be used to shut-
down the RUA631 before an input device can generate a
pop. The shutdown threshold at the UVP pin is 1.25V.
The user selects a resistor divider to obtain the shut-
down threshold and hysteresis for the specific application.
The thresholds can be determined as below:
VUVP = (1.25-6 AxR3) x (R1+R2)/R2
Hysteresis = 5 uA x R3 x (R1+R2)/R2
With the condition: R3>>R1//R2
For example, to obtain VUVP=3.8V and 1V hysteresis, R1=
3k , R2=1k and R3=50k .
Vsystem
R1
3k
R3
50k
UVP Pin
1.25V
R2
1k 6 A
Figure 2. Under-Voltage Protection
Copyright© Ruichips Semiconductor Co., Ltd
Rev. A– SEP., 2015
www.ruichips.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RUA631.PDF ] | |
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