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a
AD1958
Tel: 781/329-4700Fax: 781/326-8703
PLL/Multibit - DACFUNCTIONAL BLOCK DIAGRAM
OSC
PLL
CIRCUIT
SERIAL CONTROL
INTERFACE
VOLTAGE
REFERENCE
MCLK
AD1958
XIN
LOOP
FILTERS
CLOCK
OUTPUTS
CONTROL DATA
INPUT
MULTIBIT
SIGMA-DELTA
MODULATOR
INTERPOLATOR
8
f
ATTEN/MUTE
DAC
OUTPUT
BUFFER
SERIAL
DATA
INTERFACE
MULTIBIT
SIGMA-DELTA
MODULATOR
ATTEN/MUTE
DAC
OUTPUT
BUFFER
16-/20-/24-
BIT DIGITAL
DATA INPUT
3
L
R
ANALOG
OUTPUTS
RESET
MUTE
ZERO FLAG
PLL SUPPLY
DIGITAL SUPPLY
ANALOG SUPPLY
3
2
2
3
2
3
INTERPOLATOR
8
f
XOUT
FEATURES
5 V Stereo Audio DAC System
Accepts 16-/18-/20-/24-Bit Data
Supports 24 Bits, 192 kHz Sample Rate
Accepts a Wide Range of Sample Rates Including:
32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, and 192 kHz
Multibit Sigma-Delta Modulator with “Perfect Differential
Linearity Restoration” for Reduced Idle Tones and
Noise Floor
Data Directed Scrambling DAC—Least Sensitive to Jitter
Single-Ended Output for Easy Use
108 dB Signal-to-Noise (Not Muted) at 48 kHz Sample
Rate (A-Weighted Stereo)
109 dB Dynamic Range (Not Muted) at 48 kHz Sample
Rate (A-Weighted Stereo)
–96 dB THD + N (Stereo)
75 dB Stop Band Attenuation
On-Chip Clickless Volume Control
Hardware and Software Controllable Clickless Mute
Serial (SPI) Control for: Serial Mode, Number of Bits,
Sample Rate, Volume, Mute, De-Emphasis
Digital De-Emphasis Processing for 32 kHz, 44.1 kHz,
and 48 kHz Sample Rates
Programmable Dual Fractional-N PLL Clock Generator
27 MHz Master Clock Oscillator
Better than 100 ps rms Master Clock Jitter
Generated System Clocks
SCLK0: 33.8688 MHz
SCLK1: 22.5792 MHz, 24.576 MHz, 33.8688 MHz, or
36.864 MHz
SCLK2: 16.9344 MHz
Flexible Serial Data Port with Right-Justified, Left-
Justified, I
2
S-Compatible, and DSP Serial Port Modes
28-Lead SSOP Plastic Package
APPLICATIONS
DVD, CD, Home Theater Systems, Automotive Audio
Systems, Sampling Musical Keyboards, Digital Mixing
Consoles, Digital Audio Effects Processors
PRODUCT OVERVIEW
The AD1958 is a complete high-performance single-chip stereo
digital audio playback system. It is comprised of a multibit sigma-
delta modulator, digital interpolation filters, and analog output
drive circuitry with an on-board dual PLL clock generator.
Other features include an on-chip stereo attenuator and mute,
programmed through an SPI-compatible serial control port.
The AD1958 is fully compatible with all known DVD formats
including 96 kHz and 192 kHz sample frequencies and 24 bits.
It also is backwards-compatible by supporting 50
μ
s/15
μ
s
digital de-emphasis for “redbook” compact discs, as well as
de-emphasis at 32 kHz and 48 kHz sample rates.
The AD1958 has a simple but flexible serial data input port that
allows for glueless interconnection to a variety of ADCs, DSP
chips, AES/EBU receivers, and sample rate converters. The
AD1958 can be configured in left-justified, I
2
S, right-justified,
or DSP serial-port-compatible modes. It can support 16, 20,
and 24 bits in all modes. The AD1958 accepts serial audio data
in MSB first, two’s-complement format, and operates from a
single 5 V power supply. It is fabricated on a single monolithic
integrated circuit and housed in a 28-lead SSOP package for
operation over the temperature range –40
°
C to +105
°
C.
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