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CS3302A-IS Datasheet(PDF) 11 Page - Cirrus Logic |
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CS3302A-IS Datasheet(HTML) 11 Page - Cirrus Logic |
11 / 16 page CS3302A CS3302A DS765PP1 DS765PP1 11 requires two series resistors and a differential capaci- tor to create the modulator anti-alias RC filter. 2.1.3 Differential Signals Analog signals into and out of the CS3302A are differential, consisting of two halves with equal but opposite magnitude varying about a common mode voltage. A full scale 5 Vpp differential signal centered on a -0.15 V common mode can have: SIG+ = -0.15 V + 1.25 V = 1.1 V SIG- = -0.15 V - 1.25 V = -1.4 V SIG+ is +2.5 V relative to SIG- For the reverse case: SIG+ = -0.15 V - 1.25 V = -1.4 V SIG- = -0.15 V + 1.25 V = 1.1 V SIG+ is -2.5 V relative to SIG- The total swing for SIG+ relative to SIG- is (+2.5 V) - (-2.5 V) = 5 Vpp. A similar calculation can be done for SIG- relative to SIG+. Note that a 5Vpp differential signal centered on a -0.15 V common mode voltage never exceeds 1.1 V and never drops below -1.4 V on either half of the sig- nal. By definition, differential voltages are to be mea- sured with respect to the opposite half, not relative to ground. A multimeter differentially measuring between SIG+ and SIG- in the above example would properly read 1.767 Vrms, or 5 Vpp. 2.1.4 Guard Output The GUARD pin outputs the common mode volt- age of the currently selected analog signal input. It can be used to drive the cable shield between a high-impedance sensor and the amplifier inputs. Driving the cable shield with the analog signal common mode voltage minimizes leakage and im- proves signal integrity from high-impedance sen- sors. The GUARD output is defined as the midpoint voltage between the + and - halves of the currently selected differential input signal, and will vary as the signal common mode varies. The GUARD out- put will not drive a significant load, it only pro- vides a shielding voltage. 2.2 Digital Signals 2.2.1 Gain Selection The CS3302A supports gain ranges of x1, x2, x4, x8, x16, x32, and x64. They are selected using the GAIN0, GAIN1, and GAIN2 pins as shown in Table 1 on page 8. ∆Σ Modulator Test DAC Digital Filter AMP Differential Sensor M U X µController or Configuration EEPROM System Telemetry CS3301A CS3302A CS5378 CS5373A Figure 4. System Architecture |
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