TCM29C13 Datasheet, PDF (23/25 Pages) Texas Instruments – COMBINED SINGLE-CHIP PCM CODEC AND FILTER

TCM29C13, TCM29C14, TCM29C16, TCM29C17,
TCM129C13, TCM129C14, TCM129C16, TCM129C17
COMBINED SINGLE-CHIP PCM CODEC AND FILTER
SCTS011H – APRIL 1986 – REVISED JULY 1996
PRINCIPLES OF OPERATION
receive output power amplifiers
A balanced-output amplifier is provided to allow maximum flexibility in output configuration. Either of the two
outputs can be used single ended (i.e., referenced to ANLG GND) to drive single-ended loads. Alternatively,
the differential output directly drives a bridged load. The output stage is capable of driving loads as low as 300-Ω
single-ended to a level of 12 dBm or 600 Ω differentially to a level of 15 dBm.
The receive channel transmission level may be adjusted between specified limits by manipulation of the GSR
input. GSR is internally connected to an analog gain-setting network. When GSR is connected to PWRO –, the
receive level is maximum. When GSR is connected to PWRO+, the level is minimum. The output transmission
level is adjusted between 0 and –12 dB as GSR is adjusted (with an adjustable resistor) between PWRO+ and
PWRO –.
Transmission levels are specified relative to the receive channel output under digital milliwatt conditions
(i.e., when the digital input at PCM IN is the eight-code sequence specified in CCITT recommendation G.711).
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