THS1206 Datasheet, PDF (29/41 Pages) Texas Instruments – 12-BIT 6 MSPS, SIMULTANEOUS SAMPLING ANALOG-TO-DIGITAL CONVERTERS

THS1206
12-BIT 6 MSPS, SIMULTANEOUS SAMPLING
ANALOG-TO-DIGITAL CONVERTERS
SLAS217D – MAY 1999 – REVISED APRIL 2000
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 17 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 exteral 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 17. Single-Ended Input Stage
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