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THS1401IPFBG4 Datasheet(PDF) 19 Page - Texas Instruments |
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THS1401IPFBG4 Datasheet(HTML) 19 Page - Texas Instruments |
19 / 26 page THS1401 THS1403 THS1408 SLAS248D − DECEMBER 1999 − REVISED SEPTEMBER 2005 www.ti.com 19 APPLICATION INFORMATION internal/external reference operation The THS1401/3/8 ADC can either be operated using the built-in band gap reference or using an external precision reference in case very high dc accuracy is needed. The REF+ and REF+ outputs are given by: REF )+ VBG 1 ) 2 3 and REF– If the built-in reference is used, VBG equals 1.5 V which results in REF+ = 2.5 V, REF− = 0.5 V and ∆REF = 2 V. The internal reference can be disabled by writing 1 to D12 (REF) in the control register (address 3). The band gap reference is then disconnected and can be substituted by a voltage on the VBG pin. programmable gain amplifier The on-chip programmable gain amplifier (PGA) has eight gain settings. The gain can be changed by writing to the PGA gain register (address 1). The range is 0 to 7dB in steps of one dB. out of range indication The OV output of the ADC indicates an out of range condition. Every time the difference on the analog inputs exceeds the differential reference, this signal is asserted. This signal is updated the same way as the digital data outputs and therefore subject to the same pipeline delay. offset compensation With the offset register it is possible to automatically compensate system offset errors, including errors caused by additional signal conditioning circuitry. If the offset compensation is enabled (D7 (OFF) in the control register), the value in the offset register (address 2) is automatically added to the output of the ADC. In order to set the correct value of the offset compensation register, the ADC result when the input signal is 0 must be read by the host processor and written to the offset register (address 2). test modes The ADC core operation can be tested by selecting one of the available test modes (see control register description). The test modes apply various voltages to the differential input depending on the setting in the control register. digital I/O The digital inputs and outputs of the THS1401/3/8 ADC are 3-V CMOS compatible. In order to avoid current feed back errors, the capacitive load on the digital outputs should be as low as possible (50 pF max). Series resistors (100 Ω) on the digital outputs can improve the performance by limiting the current during output transitions. The parallel interface of the THS1401/3/8 ADC features 3-state buffers, making it possible to directly connect it to a data bus. The output buffers are enabled by driving the OE input low. Refer to the read and write timing diagrams in the parameter measurement information section for information on read and write access. |
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