TLC320AD50C-I_15 Datasheet, PDF (13/57 Pages) Texas Instruments – SIGMA-DELTA ANALOG INTERFACE CIRCUITS WITH MASTER-SLAVE FUNCTION

1.6 Definitions and Terminology
ADC Channel
The ADC channel refers to all signal processing circuits between the analog input and the digital
conversion results at DOUT.
Channel Delay The delay for the analog signal at the ADC input to appear on the digital output. The delay for
the digital value at the DAC input to appear on the analog output.
d
The alpha character d represents valid programmed or default data in the control register format
(see Section 3.2) when discussing other data bit portions of the register.
Dxx
Dxx is the bit position in the primary data word (xx is the bit number).
DSxx
DSxx is the bit position in the secondary data word (xx is the bit number).
DAC Channel
DAC channel refers to all signal processing circuits between the digital data word applied to DIN
and the differential output analog signal available at OUTP and OUTM.
Data Transfer
Interval
The time during which data is transferred from DOUT and to DIN. The interval is 16 shift clocks
and the data transfer is initiated by the falling edge of the frame-sync signal.
FIR
Finite duration impulse response
f_s
The sampling frequency
Frame Sync and Frame sync and sampling period is the time between falling edges of successive primary
Sampling Period frame-sync signals. It is always equal to 256 SCLK.
Frame Sync
Frame sync refers only to the falling edge of the signal that initiates the data transfer interval.
The primary frame sync starts the primary communications, and the secondary frame sync
starts the secondary communications.
Frame-Sync
Interval
The frame-sync interval is the time period occupied by 16 shift clocks. The frame-sync signal
goes high on the seventeenth rising edge of SCLK.
Host
A host is any processing system that interfaces to DIN, DOUT, SCLK, FS, and/or MCLK.
PGA
Programmable gain amplifier
Primary
Primary communications refers to the digital data transfer interval. Since the device is
Communications synchronous, the signal data words from the ADC channel and to the DAC channel occur
simultaneously.
Secondary
Secondary communications refers to the digital control and configuration data transfer interval
Communications into DIN and the register read data cycle from DOUT. The data transfer interval occurs when
requested by hardware or software.
Signal Data
This refers to the input signal and all of the converted representations through the ADC channel
and the signal through the DAC channel to the analog output. This is contrasted with the purely
digital software control data.
X
The alpha character X represents a don’t care bit-position within the control register format.
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