THS1206IDAR Datasheet, PDF (34/43 Pages) Texas Instruments – 12-BIT, 4 ANALOG INPUT, 6 MSPS, SIMULTANEOUS SAMPLINGANALOG TO-DIGITAL CONVERTERS

THS1206
SLAS217H – MAY 1999 – REVISED JULY 2003#
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INTERFACING THE THS1206 TO THE TMS320C6201 DSP
The following application circuit shows an interface of the THS1206 to the TMS320C6201. The read (using RD,
RD-controlled) and write timings (using WR, WR-controlled) shown before are valid for this specific interface.
THS1206–1
TMS320C6201
CS0
CS1
RD
WR
DATA_AV
DATA
CONV_CLK
THS1206–2
CE1
EA20
ARE
AWE
EXT_INT6
DATA
TOUT1
TOUT2
EA21
EXT_INT7
CS0
CS1
RD
WR
DATA_AV
DATA
CONV_CLK
ANALOG INPUT CONFIGURATION AND REFERENCE VOLTAGE
The THS1206 features four analog input channels. These can be configured for either single-ended or differential
operation. Best performance is achieved in differential mode. Figure 40 shows a simplified model, where a single-ended
configuration for channel AINP is selected. The reference voltages for the ADC itself are V_REFP and V_REFM (either internal
or external reference voltage). The analog input voltage range goes from V_REFM to V_REFP. This means that V_REFM defines
the minimum voltage, which can be applied to the ADC. V_REFP defines the maximum voltage, which can be applied to the
ADC. The internal reference source provides the voltage V_REFM of 1.5 V and the voltage V_REFP of 3.5 V. The resulting
analog input voltage swing of 2 V can be expressed by:
v v VREFM AINP VREFP
(1)
VREFP
AINP
12-Bit
ADC
VREFM
Figure 40. Single-Ended Input Stage
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