🚀 go-pugleaf

In article <1619@radio.oakhill.UUCP> charlie@oakhill.UUCP (Charlie Thompson) writes:
>I guess this question is a good one for Dr. Max Hauser.  I heard
>a *rumor* that Crystal Semiconductor is going to announce a stereo
>sigma delta A/D converter next week at the AES show in LA.  Max or
>anybody know anything about this *rumor*?  Hello linear phase anti-
>aliasing! 

I just returned from AES.  From the Crystal CS5326 data sheet:

Features:

   o  Complete Stereo A/D System
         Delta-Sigma A/D Converters
         Digital Anti-Alias Filtering
         S/H Circuitry and Voltage Reference

   o  Adjustable System Sampling Rates
         32 KHz, 44.1 KHz, 48 KHz  [anti-alias filter automatically scales
                                    to sampling frequency]
   o  Low Noise and Distortion
         94 dB dynamic range
         0.0015% THD

   o  Internal 64X Oversampling

   o  Linear Phase Digital Anti-Alias Filtering
         0.001 dB Passband Ripple
         86 dB Stopband Rejection

   o  Low Power Dissipation: 500 mW
         Power-Down Mode for Portable Applications


General Description:

The CS5326 is a complete Analog-to-Digital converter for stereo digital audio
systems.  It performs sampling, analog-to-digital conversion and anti-aliasing
filtering, generating 16-bit values for both left and right inputs in serial
form.  The CS5326's output word rate can be up to 50 KHz per channel.

The CS5326 uses delta-sigma modulation to achieve high performance.
Oversampling, followed by digital filtering and decimation, greatly eases
external alti-alias filter requirements.  [I'll say, in the typical connection
diagram, the external anti-aliasing filter is a .01uF capacitor and a 51 ohm
resistor!]  The CS5326 oversamples at 64X the output word rate and uses a
3-stage digital FIR filter to achieve 94dB Signal-to-Noise Ratio and 0.0015%
THD over a 10 Hz to 22 KHz bandwidth.  The FIR filters offer linear phase,
0.001 dB passband ripple [!], and >86 dB stopband rejection.

The CS5326 is packaged in a 0.6" wide 28-pin plastic DIP.  Powered from +/- 5V
supplies, the CS5326 dissipates 500 mW, and includes a power-down mode for
battery powered applications.


Analog Characteristics  (Ta = 25 C, Full-Scale Input Sinewave, 1 KHz, 48 KHz
output word rate)

Resolution:  min 16 bits
Signal-to-(Noise + Distortion):  typ 92 dB, 10Hz to 22 KHz
THD:  max 0.003%  typ 0.0015%, Vin = +/- full-scale
      typ 0.001%, Vin = -20 dB
Dynamic Range:  min 93 dB, typ 94 dB
Interchannel Phase Deviation: typ 0.0001 degrees [!]
Interchannel Isolation at 20 KHz:  typ 105 dB
Interchannel Gain Mismatch:  typ 0.05 dB
Gain Error:  max +/- 5% [due to on-chip voltage reference, I'm told]
Gain Drift:  typ 150 ppm/degree C  [ditto]
Offset Error (after calibrtion):  +/- 15 LSB  [has on-chip offset calibration
                                               mode.  will also cal out offset
                                               of driving source]
Input Voltage Range:  +/- 3.6 V for full-scale output


[Differential Nonlinearity is essentially zero because of the one-bit sampler
in the front-end.  A plot in the data sheet shows it to be within 1/4 LSB over
the entire range of the converter.  The typical connection diagram shows
external components consist of 11 capicators (mostly for power supply
decoupling), 3 resistors, 1 inductor (decoupling), and a clock source.  That's
all that's needed for a complete stereo converter.]

-- 
Bill McFadden    Tektronix, Inc.  P.O. Box 500  MS 58-639  Beaverton, OR  97077
UUCP: bill@videovax.Tek.COM,  {hplabs,uw-beaver,decvax}!tektronix!videovax!bill
GTE: (503) 627-6920    Funniest new cartoon title: Teenage Mutant Ninja Turtles