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T8535B Datasheet(PDF) 29 Page - Agere Systems

Part No. T8535B
Description  T8535B/T8536B Quad Programmable Codec
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Maker  AGERE [Agere Systems]
Homepage  http://www.agere.com
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T8535B Datasheet(HTML) 29 Page - Agere Systems

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Agere Systems Inc.
29
Preliminary Data Sheet
September 2001
T8535B/T8536B Quad Programmable Codec
Electrical Characteristics (continued)
Gain and Dynamic Range
Table 13. Gain and Dynamic Range
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Absolute Levels
GAL
Maximum 0 dBm0 levels (1004 Hz):
VFXI (encoder milliwatt), all programma-
ble transmit gains set to 0 dB.
RCV (decoder milliwatt), termination
impedance off, all programmable
receive gains set to 0 dB.
2.80
5.29
Vp-p
Vp-p
Absolute Levels
GAL
Minimum 0 dBm0 levels (1004 Hz):
VFXI (encoder milliwatt),
XAG = 24 dB, GTX1 = 6 dB,
GTX2 = 0 dB.
RCV (decoder milliwatt), termination
impedance off, GRX1 = 0 dB,
GRX2 =
−6 dB.
87.5
2.63
mVp-p
Vp-p
Absolute Maximum Volt-
age Swings
GAL
VFXI
VFROP to VFRON (differential).
3.2
5.28
Vp-p
Vp-p
Transmit Gain Absolute
Accuracy
GXA
Transmit gain programmed for maxi-
mum 0 dBm0 test level, measured devi-
ation of digital code from ideal
0 dBm0 level at DX digital outputs, with
transmit gain set to 0 dB:
20 °C to 70 °C
0 °C to 85 °C
−40 °C to +85 °C.
−0.25
−0.30
±0.15
0.25
0.30
dB
dB
dB
Transmit Gain Variation
with Programmed Gain
GXAG
Measured transmit gain over the range
from maximum to minimum, calculated
deviation from the programmed gain rel-
ative to GXA at 0 dB, VDD = 5 V.
−0.1
0.1
dB
Transmit Gain Variation
with Frequency, 600
Resistive Source
Impedance and Syn-
thesized Termination
Impedance
GXAF
Relative to 1004 Hz, minimum
gain < GX < maximum gain,
VFXI = 0 dBm0 signal, path gain
set to 0 dB:
f = 16.67 Hz
f = 40 Hz
f = 50 Hz
f = 60 Hz
f = 200 Hz
f = 300 Hz to 3000 Hz
f = 3140 Hz
f = 3380 Hz
f = 3860 Hz
f = 4600 Hz and above.
−3.0
−0.125
−0.57
−0.735
−50
−40
−40
−55
−2.0
±0.04
0.01
−0.03
−8.8
−30
−26
−30
−30
0
0.135
0.125
0.015
−8.98
−32
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB


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