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參數資料
| 型號： | UBA1707 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Cordless telephone, answering machine line interface(無繩電話，電話應答機線接口) |
| 中文描述： | 無繩電話，應答機行界面（無繩電話，電話應答機線接口） |
| 文件頁數： | 14/36頁 |
| 文件大小： | 245K |
| 代理商： | UBA1707 |
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1999 Feb 17
14
Philips Semiconductors
Product specification
Cordless telephone, answering machine
line interface
UBA1707
Auxiliary amplifier (pins AXI and AXO; bit AXM)
The auxiliary amplifier (see Fig.12) has one input (AXI) and one output (AXO). The input impedance between pins AXI
and GND is 3.8 k
. The rail-to-rail output stage is designed to drive a 500
μ
A peak current. The output impedance at pin
AXO is approximately 100
.
The output as well as the input are biased at 2
×
V
d
1.4 V DC voltage. The voltage gain from pin AXI to pin AXO is set
at 31.8 dB.The amplifier can be muted by setting bit AXM at logic 1 via the serial interface. In this case, the input
impedance between pins AXI and GND is infinite.
Fig.12 Auxiliary amplifier.
handbook, full pagewidth
MGK712
AXM
2Vd
AXI
AXO
UBA1707
Bit names are given in italics.
Loudspeaker channel
(see Fig.13)
L
OUDSPEAKER AMPLIFIER
(
PINS
LSAI1, LSAI2, LSAO
AND
LSPGND;
BITS
LSPD, LSA1
AND
LSA2)
The loudspeaker amplifier has two symmetrical inputs
LSAI1 and LSAI2 selectable independently by the bits
LSA1 and LSA2 respectively. The input impedance
between pins LSAI1or LSAI2 and GND is typically 21 k
.
Each of these two inputs stages can accommodate signals
up to 500 mV (RMS) at room temperature for less than 2%
of Total Harmonic Distortion (THD) at minimum voltage
gain.
The inputs are biased at 2
×
V
d
1.4 V DC voltage
(whatever the state of bits LSA1 and LSA2).
The rail-to-rail output stage is designed to power a
loudspeaker connected as a single-ended load (between
pins LSAO and LSPGND). The output LSAO is able to
drive at least a 150 mA peak current.
As a result, it can drive loudspeaker loads down to 8
at
V
CC
= 4.0 V and 16
at V
CC
= 5.5 V. The output is biased
at
1
2
V
CC
. Its output voltage capability is specified for
continuous wave drive and depends on the value of V
CC
.
In order to avoid crosstalk from the loudspeaker to other
amplifiers, the loudspeaker current flows via pin LSPGND.
This pin must be externally connected to pin GND.
The nominal value of the voltage gain for maximum
volume from pins LSAI1 or LSAI2 to pin LSAO is set at
28 dB.
This amplifier is no longer supplied by setting the LSPD bit
at logic 1 via the serial interface.
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