AD1837AAS Analog Devices Inc, AD1837AAS Datasheet - Page 10

• Manufacturer Part Number: AD1837AAS
• Description: IC CODEC 2ADC/8DAC 24BIT 52-MQFP
• Manufacturer: Analog Devices Inc
• Type: General Purposer

Specifications of AD1837AAS

• Rohs Status: RoHS non-compliant
• Data Interface: Serial
• Resolution (bits): 24 b
• Number Of Adcs / Dacs: 2 / 8
• Sigma Delta: Yes
• S/n Ratio, Adcs / Dacs (db) Typ: 105 / 108
• Dynamic Range, Adcs / Dacs (db) Typ: 105 / 108
• Voltage - Supply, Analog: 4.5 V ~ 5.5 V
• Voltage - Supply, Digital: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 52-BQFP
• For Use With: EVAL-AD1837AEB - BOARD EVALUATION FOR AD1837A

AD1837A
TERMINOLOGY
Dynamic Range
The ratio of a full-scale input signal to the integrated input noise
in the pass band (20 Hz to 20 kHz), expressed in decibels (dB).
Dynamic range is measured with a –60 dB input signal and is
equal to (S/[THD + N]) + 60 dB. Note that spurious harmonics
are below the noise with a –60 dB input, so the noise level
establishes the dynamic range. The dynamic range is specified
with and without an A-weight filter applied.
Signal-to-(Total Harmonic Distortion + Noise)
[S/(THD + N)]
The ratio of the root-mean-square (rms) value of the funda-
mental input signal to the rms sum of all other spectral compo-
nents in the pass band, expressed in decibels (dB).
Pass Band
The region of the frequency spectrum unaffected by the attenu-
ation of the digital decimator’s filter.
Pass-Band Ripple
The peak-to-peak variation in amplitude response from equal-
amplitude input signal frequencies within the pass band, expressed
in decibels.
Stop Band
The region of the frequency spectrum attenuated by the
digital decimator’s filter to the degree specified by stop-band
attenuation.
Gain Error
With a near full-scale input, the ratio of actual output to expected
output, expressed as a percentage.
Interchannel Gain Mismatch
With identical near full-scale inputs, the ratio of outputs of the
two stereo channels, expressed in decibels.
–10–
Gain Drift
Change in response to a near full-scale input with a change in
temperature, expressed as parts-per-million (ppm) per ∞C.
Crosstalk (EIAJ Method)
Ratio of response on one channel with a grounded input to a
full-scale 1 kHz sine wave input on the other channel, expressed
in decibels.
Power Supply Rejection
With no analog input, signal present at the output when a
300 mV p-p signal is applied to power supply pins, expressed
in decibels of full scale.
Group Delay
Intuitively, the time interval required for an input pulse to
appear at the converter’s output, expressed in microseconds
(ms). More precisely, the derivative of radian phase with
respect to radian frequency at a given frequency.
Group Delay Variation
The difference in group delays at different input frequencies.
Specified as the difference between largest and the smallest
group delays in the pass band, expressed in microseconds (ms).
ACRONYMS
ADC—Analog-to-Digital Converter.
DAC—Digital-to-Analog Converter.
DSP—Digital Signal Processor.
IMCLK—Internal Master Clock Signal used to clock the ADC
and DAC engines.
MCLK—External Master Clock Signal applied to the AD1837A.
REV. A