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AD28MSP01 Datasheet(PDF) 17 Page - Analog Devices |
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AD28MSP01 Datasheet(HTML) 17 Page - Analog Devices |
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17 / 28 page  AD28msp01 REV. A –17– V OUTP V OUTN –12V 4 7 SSM-214 GND A SSM2141 5 1 V OUT 0.1 µF GND A +12V AD28msp01 0.1 µF GND A Figure 15. Example Circuit for Single-Ended Output Single Power Supply Operation Use of a single +5 V power supply is possible with the AD28msp01. If a single supply is used, the analog power supply input to the device must be properly filtered. The proper filter is dependent on the noise present in your system. PC Board Layout Considerations Separate analog and digital ground planes should be provided for the AD28msp01 in order to assure the characteristics of the device’s ADC and DAC. The two ground planes should be con- nected only at a single point. The point of connection may be at the system power supply, at the PC board power connection, or at any other appropriate location. Multiple connections between the analog and digital ground planes should be avoided. The ground planes should be designed such that all noise- sensitive areas are isolated from one another and critical signal traces (such as digital clocks and analog signals) are as short as possible. Each +5 V supply pin of the AD28msp01 should be bypassed to ground with a 0.1 µF capacitor. These capacitors should be low inductance, monolithic, ceramic, and surface-mount. The ca- pacitor leads and PC board traces should be as short as possible to minimize inductive effects. In addition, a 10 µF capacitor should be connected between VDD and ground, near the PC board power connection. MCLK Frequency The sigma-delta converters and digital filters of the AD28msp01 are specifically designed to operate at a master clock (MCLK) frequency of 13.824 MHz. MCLK must equal 13.824 MHz to guarantee the filter characteristics and sample rate of the ADC and DAC. The AD28msp01 is not tested or characterized at any other clock frequency. DEFINITION OF SPECIFICATIONS Typical (Typ) specifications represent nominal performance at +25 °C with V CC and VDD set to +5 V. Minimum (Min) and Maximum (Max) specifications are guar- anteed across the full operating range, however, devices are tested only at the indicated test conditions. Absolute Gain Absolute gain is a measure of converter gain for a known signal. Absolute gain is measured with a 1.0 kHz sine wave at 0 dBm0. The absolute gain specification is used as a reference for gain tracking error specification. Gain Tracking Error Gain tracking error measures changes in converter output for different signal levels relative to an absolute signal level. The ab- solute signal level is 1 kHz at 0 dBm0 (equal to absolute gain). Gain tracking error at 0 dBm0 is 0 dB by definition. SNR Signal-to-noise ratio is defined to be the ratio of the rms value of the measured input signal to the rms sum of all the spectral components in the specified passband, excluding dc and har- monic components. THD Total harmonic distortion is defined to be the ratio of the rms value of the measured input signal to the rms sum of the har- monic components in the specified passband. Intermodulation Distortion With inputs consisting of sine waves at two frequencies, fa and fb, any active device with nonlinearities will create distortion products at sum and difference frequencies of mfa ± nfb where m, n = 0, 1, 2, 3, etc. Intermodulation terms are those for which neither m nor n are equal to zero. This specification contains the second order terms include (fa + fb) and (fa – fb), and the third order terms include (2fa + fb), (2fa – fb), (fa + 2fb), and (fa – 2fb). Idle Channel Noise Idle channel noise is defined as the total signal energy measured at the output of the device when the input is grounded (mea- sured in the specified passband). Crosstalk Crosstalk is defined as the ratio of the amplitude of a 0 dB sig- nal appearing on one channel to the amplitude of the same sig- nal coupled onto the other, idle channel. Crosstalk is expressed in dB. Power Supply Rejection Power supply rejection measures the susceptibility of a device to noise on the power supply. Power supply rejection is measured by modulating the power supply with a 1 kHz, 100 mV p-p sine wave and measuring the relative level at the output. Group Delay Group delay is defined as the derivative of radian phase with re- spect to radian frequency, ∂φ(ω)/∂ω. Group delay is a measure of the linearity of the phase response of a linear system. A linear system with a constant group delay has a linear phase response. The deviation of the group delay away from a constant indicates the degree of nonlinear phase response of the system. |
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