參數(shù)資料
型號(hào)： T7502
元件分類： Codec
英文描述： T7502 Dual PCM Codec with Filters
中文描述： T7502雙PCM編解碼器與濾波器
文件頁(yè)數(shù)： 12/16頁(yè)
文件大?。?/td> 417K
代理商： T7502
12
Lucent Technologies Inc.
Data Sheet
February 1998
T7502 Dual PCM Codec with Filters
Applications
Figure 7 shows one possible analog connection. Fully differential structures used for the inputs minimize the noise
gain from the internal 2.4 V bias voltage to the output of the single-ended transmitter op amp. The forward path gain
is G, and by using resistors on the positive side that are a factor of 1/(2G + 1) of those on the negative side, the
microphone and transformer feeds are kept well balanced. Using this ratio, G can be as low as unity (0 dB) without
exceeding the common-mode limit of the op amp.
Users have wide latitude when selecting between a balanced amplifier configuration or a single-ended
configuration. Single-ended configurations usually need fewer external components (e.g., R
IP
=
∞
and R
FP
= 0 in
Figure 2) but have two disadvantages: one, dc blocking from the source is typically required; two, internally
generated noise at the common-mode pin VCM0 or VCM1 is amplified by G. For G > 10 (20 dB), this noise gain
can become the factor that could limit performance. Single-ended configurations can be used even with
microphones and transformers (R
IP
= 0 in these cases), but parasitic issues become somewhat more complex; so
single-ended configurations are only suggested for gains of four (12 dB) or less.
5-3789.c
Figure 7. Typical T7502 Application
2.4 V
MICROPHONE
SPEAKER
DSP
D
X
D
R
MCLK
FS
2.4 V
T7502
CENTRAL
OFFICE
LINE
G x R
SPEAKER
DRIVER
+
–
+
–
+
–
+
–
R
R
(
2G + 1)
R
R
(
2G + 1)
G x R
(
2G + 1)
G x R
G x R
(
2G + 1)
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
T75-02A 制造商:The Cherry Corporation 功能描述:
T75-02A-2 制造商:The Cherry Corporation 功能描述:
T7503 制造商:AGERE 制造商全稱:AGERE 功能描述:T7503 Dual PCM Codec with Filters
T75-03A 制造商:The Cherry Corporation 功能描述:
T7504 制造商:AGERE 制造商全稱:AGERE 功能描述:T7504 and T75504 Quad PCM Codecs with Filters
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