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| 型號： | CPS1027-S |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁數(shù)： | 51/64頁 |
| 文件大小： | 870K |
| 代理商： | CPS1027-S |
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Agere Systems Inc.
Data Sheet
January 2002
CSP1027 Voice Band Codec for
Cellular Handset and Modem Applications
51
10 Analog Characteristics and Requirements
The following analog characteristics and requirements are preliminary information and are subject to change. Ana-
log characteristics refer to the behavior of the device under specified conditions. Analog requirements refer to con-
ditions imposed on the user for proper operation of the device. All analog data is valid for the following conditions
unless otherwise specified:
I
T
A
= –40 °C to +85 °C.
I
V
DDA
= 5 V ± 10% (See Section 8.2 on page 47.)
I
Sampling frequency = 8 kHz, oversampling clock (CK
OS
) = 1.0 MHz, input clock (CLK) = 25 MHz.
I
0.22 μF capacitors connected to the REFC pin.
I
0.15 μF coupling capacitors connected to the MICIN and AUXIN pins when EIGS = 0.
I
Rfb = Rin = 24 k
, Cfb = 270 pF, and Cin = 1 μF when in the external input gain select mode (EIGS = 1).
I
2 k
differential output load connected between AOUTP and AOUTN pins.
I
1 μF and 0.1 μF bypass capacitors connected between the V
REG
and V
SSA
.
I
0 dBm0 is the level that corresponds to a sine wave that is 3.14 dB below the clipping (overload) level at the out-
put of the A/D or input to the D/A.
I
All noise and distortion measurements are flat weighted and integrated over the 300 Hz to 4 kHz frequency band.
10.1 Analog Input and Microphone Regulator
Note: The input clipping level corresponds to an A/D path output of 3.14 dBm0.
Note: V
REG
must be bypassed to analog ground through a 1 μF low ESR capacitor to meet this noise specification. The minimum bypass capac-
itance for stable V
REG
operation is 0.1 μF, with a maximum noise of 200 μVrms.
Table 14. Analog Input Characteristics and Requirements
Symbol
Rin
A/D Input Resistance of AUXIN and MICIN:
EIGS = 0
EIGS = 1
Cin
A/D Input Capacitance on AUXIN and MICIN
—
A/D Input Clipping Level at AUXIN or MICIN:
EIGS = 0,
cioc0
: IRSEL = 0
EIGS = 0,
cioc0
: IRSEL = 1
—
A/D Input Clipping Level at AUXIN:
EIGS = 1
—
Gain Referred to Nominal Clipping Level:
EIGS = 0,
cioc0
: IRSEL = 0
EIGS = 0,
cioc0
: IRSEL = 1
EIGS = 1
Parameter
Min
Typ
Max
Unit
40
1000
—
—
—
—
—
—
20
k
k
pF
0.490
0.143
0.500
0.160
0.510
0.180
Vp
Vp
1.49
1.578
1.67
Vp
–0.18
–1.0
–0.5
0
0
0
0.18
1.0
0.5
dB
dB
dB
Table 15. Microphone Regulator Characteristics
Parameter
V
REG
Output Voltage
V
REG
Output Current
V
REG
Output Noise
Min
2.7
—
—
Typ
3.0
—
—
Max
3.3
250
100
Unit
Vrms
μA
μVrms
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