Datasheet AD1835A (Analog Devices) - 10

AD1835A DEFINITIONS Gain Drift
Change in response to a near full-scale input with a change in
Dynamic Range
The ratio of a full-scale input signal to the integrated input noise temperature, expressed as parts-per-million (ppm) per °C. in the pass band (20 Hz to 20 kHz), expressed in decibels (dB).
Crosstalk (EIAJ Method)
Dynamic range is measured with a –60 dB input signal and is Ratio of response on one channel with a grounded input to a equal to (S/[THD + N]) + 60 dB. Note that spurious harmonics full-scale 1 kHz sine wave input on the other channel, expressed are below the noise with a –60 dB input, so the noise level in decibels. establishes the dynamic range. The dynamic range is specified
Power Supply Rejection
with and without an A-weight filter applied. With no analog input, signal present at the output when a
Signal-to-(Total Harmonic Distortion + Noise)[S/(THD + N)]
300 mV p-p signal is applied to power supply pins, expressed in The ratio of the root-mean-square (rms) value of the fundamen- decibels of full scale. tal input signal to the rms sum of all other spectral components
Group Delay
in the pass band, expressed in decibels (dB). Intuitively, the time interval required for an input pulse to
Pass Band
appear at the converter’s output, expressed in microseconds. The region of the frequency spectrum unaffected by the attenu- More precisely, the derivative of radian phase with respect to ation of the digital decimator’s filter. radian frequency at a given frequency.
Pass-Band Ripple Group Delay Variation
The peak-to-peak variation in amplitude response from equal- The difference in group delays at different input frequencies. amplitude input signal frequencies within the pass band, expressed Specified as the difference between the largest and the smallest in decibels. group delays in the pass band, expressed in microseconds.
Stop Band
The region of the frequency spectrum attenuated by the digital
GLOSSARY
decimator’s filter to the degree specified by stop-band attenuation. ADC—Analog-to-Digital Converter. DAC—Digital-to-Analog Converter.
Gain Error
DSP—Digital Signal Processor. With a near full-scale input, the ratio of actual output to expected IMCLK—Internal Master Clock Signal Used to Clock the ADC output, expressed as a percentage. and DAC Engines.
Interchannel Gain Mismatch
MCLK—External Master Clock Signal Applied to the AD1835A. With identical near full-scale inputs, the ratio of outputs of the two stereo channels, expressed in decibels. –10– REV. A Document Outline FEATURES APPLICATIONS PRODUCT OVERVIEW FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS TEMPERATURE RANGE ORDERING GUIDE PIN CONFIGURATION PIN FUNCTION DESCRIPTIONS Typical Performance Characteristics DEFINITIONS Dynamic Range Signal-to-(Total Harmonic Distortion + Noise)[S/(THD + N)] Pass Band Pass-Band Ripple Stop Band Gain Error Interchannel Gain Mismatch Gain Drift Crosstalk (EIAJ Method) Power Supply Rejection Group Delay Group Delay Variation GLOSSARY FUNCTIONAL OVERVIEW ADCs DACs DAC and ADC Coding AD1835A CLOCKING SCHEME Selecting DAC Sampling Rate Selecting an ADC Sample Rate RESET and Power-Down Power Supply and Voltage Reference Serial Control Port Serial Data Ports—Data Format Packed Modes Auxiliary (TDM) Mode CONTROL/STATUS REGISTERS DAC Control Registers Sample Rate Power-Down/Reset DAC Data-Word Width DAC Data Format De-emphasis Mute DAC Stereo Replicate DAC Volume Control ADC Control Registers ADC Peak Level Sample Rate ADC Power-Down High-Pass Filter ADC Data-Word Width ADC Data Format Master/Slave Auxiliary Mode ADC Peak Readback CASCADE MODE Dual AD1835A Cascade OUTLINE DIMENSIONS Revision History