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W681360SG Datasheet(PDF) 9 Page - Winbond |
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W681360SG Datasheet(HTML) 9 Page - Winbond |
9 / 34 page W681360 Publication Release Date: September 2005 - 9 - Revision A.2 Table 7.1. When the input operational amplifier is powered down the AO pin becomes high input impedance. TABLE 7.1: INPUT AMPLIFIER MODES OF OPERATION AI+ (Pin 19) Input Amplifier Input VDD Powered Down AO (Pin 17) 1.2 to VDD-1.2 Powered Up AI+, AI- (Pins 19, 18) VSS Powered Down AI- (Pin 18) When the input amplifier is powered down, the input signal at AO or AI- should be referenced to the analog ground voltage VAG. The output of the input operational amplifier is first fed through a low-pass filter to prevent aliasing at the switched capacitor 3.4kHz low pass filter. Subsequently the 3.4kHz switched capacitor low pass filter bandlimits the input signals well below 4kHz. Signals above 4kHz would be aliased at the sampling rate of 8kHz. A high pass filter with a 200Hz cut-off frequency prevents DC coupling. All filters are designed according to the G.712 ITU-T specification. The high-pass filter may be bypassed depending on the logic level on the HB pin. If the high pass is removed the frequency response of the device extends down to DC. After filtering the signal is digitized as a 13-bit linear PCM code and fed to the PCM interface for serial transmission at the sample rate supplied by the external frame sync FST. 7.1.1 Input Operational Amplifier Gain The gain of the input operational amplifier can be adjusted using external resistors. For single-ended input operation the gain is given by a simple resistive ratio. FIGURE 7.2: INPUT OPERATIONAL AMPLIFIER GAIN – SINGLE-ENDED INPUT Gin = Ro/Ri Vin VAG - + AI+ AI- AO Ri Ro For differential input operation the external resistor network is more complex but the gain is expressed in the same way. Of course, a differential input also has an inherent 6dB advantage over a corresponding single-ended input. |
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