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| 型號： | CPS1087 |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 34/64頁 |
| 文件大小： | 870K |
| 代理商： | CPS1087 |
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CSP1027 Voice Band Codec for
Cellular Handset and Modem Applications
Data Sheet
January 2002
Agere Systems Inc.
34
7 Application Information
(continued)
Figure 29 (A—E) on page 35 illustrates five different analog output configurations. In Figure 29A, the output load is
driven in a fully differential manner. It is assumed that the load is floating, having no path to ground. Figure 29B is
similar, but ac-coupling capacitors are used. A low-pass pole is created, whose frequency should be less than
30 Hz in order to not interfere with the voice band frequency response.
In Figure 29 (C—E), different variations of single-ended loads are shown. In any single-ended configuration, ac-
coupling capacitors are required.
Notes:
Analog (V
SSA
) and digital (V
SS
) ground pins are tied together to prevent substrate currents from ground bounce.
Capacitors C
A2
, C
D2
, C
REF
, C
REG
1, and C
REG
2 should be type X7R ceramic.
Capacitors C
A1
and C
D1
should be tantalum or low ESR aluminum.
All capacitors should be located as close to the chip pins as possible.
Keep analog and digital grounds separate, and then join at the V
SSA
pin.
Keep the regulator as close to the chip as possible.
The power connections are shown when the analog and digital are run from 5.0 V. When the digital is run from a 3.3 V power supply, C
D1
and
C
D2
go from the 3.3 V regulator to ground, and Ra goes to the 5.0 V regulator.
Figure 28. Analog External Configurations in Preamplifier Mode (EIGS = 0)
5-7607 (F)
AOUTP
AOUTN
Ro
Ro
RL
+
–
–
+
Vo
Vo
CSP1027
V
DD
V
SS
TO 5.0 V
REGULATOR
V
SS
DIGITAL
GND
PLANE
V
DDA
V
SSA
REFC
Ra
(3
)
C
(0.1
μ
F)
C
A1
(10
μ
F)
V
SSA
V
SS
V
SSA
C
2
(0.1
μ
F)
ANALOG
GND PLANE
EIGS
AUXIN
MICIN
V
REG
C
REG
1
(1
μ
F)
V
SSA
Cin
(0.15
μ
F)
C
(0.22
μ
F)
Vin2
+
MICROPHONE
SHIELDING
–
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