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ADS1230IPWRG4 Datasheet(PDF) 11 Page - Texas Instruments |
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ADS1230IPWRG4 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 30 page  AVDD (1)f MOD =76.8kHz Z =500MW EFF (1) REFP REFN AVDD ESD Protection C BUF CLK_DETECT Internal Oscillator MUX ToADC S S0 S1 EN CLKIN Z EFF + 1 (2)(76.8kHz)(13fF) + 500MW Z EFF + 1 2f MODCBUF ADS1230 www.ti.com SBAS366B – OCTOBER 2006 – REVISED SEPTEMBER 2012 VOLTAGE REFERENCE INPUTS ESD diodes protect the reference inputs. To prevent (REFP, REFN) these diodes from turning on, make sure the voltages on the reference pins do not go below GND by more The voltage reference used by the modulator is than 100mV, and likewise, do not exceed AVDD by generated from the voltage difference between REFP 100mV: and REFN: VREF = REFP – REFN. The reference inputs use a structure similar to that of the analog GND – 100mV < (REFP or REFN) < AVDD + 100mV inputs. In order to increase the reference input impedance, a switching buffer circuitry is used to CLOCK SOURCES reduce the input equivalent capacitance. The The ADS1230 can use an external clock source or reference drift and noise impact ADC performance. In internal oscillator to accommodate a wide variety of order to achieve best results, pay close attention to applications. Figure 20 shows the equivalent circuitry the reference noise and drift specifications. A of the clock source. The CLK_DETECT block simplified diagram of the circuitry on the reference determines whether the crystal oscillator/external inputs is shown in Figure 19. The switches and clock signal is applied to the CLKIN pin so that the capacitors can be modeled approximately using an internal oscillator is bypassed or activated. When the effective impedance of: CLKIN pin frequency is above ~200kHz, the CLK_DETECT output goes low and shuts down the internal oscillator. When the CLKIN pin frequency is below ~200kHz, the CLK_DETECT output goes high Where: and activates the internal oscillator. It is highly fMOD = modulator sampling frequency (76.8kHz) recommended to hard-wire the CLKIN pin to ground CBUF = input capacitance of the buffer when the internal oscillator is chosen. For the ADS1230: Figure 20. Equivalent Circuitry of the Clock Source An external clock may be used by driving the CLKIN pin directly. The Electrical Characteristics table shows the allowable frequency range. The clock input may be driven with 5V logic, regardless of the DVDD or AVDD voltage. Figure 19. Simplified Reference Input Circuitry Copyright © 2006–2012, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: ADS1230 |
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