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AS1710 Datasheet(PDF) 10 Page - ams AG

Part # AS1710
Description  High-Output-Drive, 10MHz, 10V/us, Rail-to-Rail I/O Op Amps with Shutdown
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS1710 Datasheet(HTML) 10 Page - ams AG

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www.austriamicrosystems.com
Revision 1.06
10 - 17
AS1710/AS1712
Data Sheet - A p p l i c a t i o n I n f o r m a t i o n
60mW Single-Supply Stereo Headphone Driver
Two AS1710 amplifiers can be used as a single-supply, stereo headphone driver. The circuit shown in Figure 22 can
deliver 60mW per channel with 1% distortion from a single 5V supply.
Figure 22. Stereo Headphone Driver Application (with Coupling Capacitor)
In Figure 22, CIN and RIN form a high-pass filter that removes the DC bias from the incoming signal. The -3dB point of
the high-pass filter is given by:
f-3dB = 1/(2
πRINCIN)(EQ 4)
Choose gain-setting resistors RIN and RF according to the amount of desired gain, keeping in mind the maximum out-
put amplitude.
COUT blocks the DC component of the amplifier output, preventing DC current flowing to the load. The output capacitor
and the load impedance form a high-pass filter with the -3dB point determined by:
f-3dB = 1/(2
πRLOADCOUT)(EQ 5)
For a 32
Ω load, a 100µF aluminum electrolytic capacitor gives a low-frequency pole at 50Hz.
Rail-to-Rail Input Stage
The AS1710/AS1712 CMOS op amps have parallel connected N- and P-channel differential input stages that combine
to accept a common-mode range extending to both supply rails. The N-channel stage is active for common-mode input
voltages typically greater than (VSS + 1.2V), and the p-channel stage is active for common-mode input voltages typi-
cally less than (VDD - 1.2V).
Rail-to-Rail Output Stage
The minimum output is within millivolts of ground for single- supply operation, where the load is referenced to ground
(VSS). Figure 23 shows the input voltage range and the output voltage swing of an AS1710 connected as a voltage fol-
lower. The maximum output voltage swing is load dependent although it is guaranteed to be within 500mV of the posi-
tive rail (VDD = 2.7V) even with maximum load (32
Ω to ground).
VBIAS
RIN
Headphone Jack
to 32
Ω Stereo
Headset
CIN
+
AS1710
RF
RIN
CIN
RF
+
AS1710
COUT
+
COUT
+
Audio In
Left
Audio In
Right


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