AD1937 Datasheet, PDF (1/36 Pages) Analog Devices – Four ADCs/Eight DACs with PLL, 192 kHz, 24-Bit Codec

Four ADCs/Eight DACs with PLL,
192 kHz, 24-Bit Codec
AD1937
FEATURES
PLL-generated clock or direct master clock
Low EMI design
112 dB DAC/107 dB ADC dynamic range and SNR
−96 dB THD + N
Single 3.3 V supply
Tolerance for 5 V logic inputs
Supports 24-bits and 8 kHz to 192 kHz sample rates
Differential ADC input
Differential DAC output
Log volume control with autoramp function
I²C-controllable for flexibility
Software-controllable clickless mute
Software power-down
Right-justified, left-justified, I²S, and TDM modes
Master and slave modes up to 16-channel input/output
Available in a 64-lead LQFP
AECQ-100 qualified
APPLICATIONS
Automotive audio systems
Home theater systems
Set-top boxes
Digital audio effects processors
GENERAL DESCRIPTION
The AD1937 is a high performance, single-chip codec that provides
four analog-to-digital converters (ADCs) with differential input
and eight digital-to-analog converters (DACs) with differential
output, using the Analog Devices, Inc., patented multibit sigma-
delta (Σ-Δ) architecture. An I²C® port is included, allowing a
microcontroller to adjust volume and many other parameters.
The AD1937 operates from 3.3 V digital and analog supplies.
The AD1937 is available in a 64-lead (differential output) LQFP.
The AD1937 is designed for low EMI. This consideration is
apparent in both the system and circuit design architectures.
By using the on-board PLL to derive the master clock from the
LR (frame) clock or from an external crystal, the AD1937 elimi-
nates the need for a separate high frequency master clock and
can also be used with a suppressed bit clock. The DACs and
ADCs are designed using the latest Analog Devices continuous
time architecture to further minimize EMI. By using 3.3 V
supplies, power consumption is minimized and further
reduces emissions.
FUNCTIONAL BLOCK DIAGRAM
DIGITAL AUDIO
INPUT/OUTPUT
ANALOG
AUDIO
INPUTS
AD1937
SERIAL DATA PORT
ADC
ADC
ADC
ADC
DIGITAL
FILTER
SDATA
OUT
SDATA
IN
CLOCKS
TIMING MANAGEMENT
AND CONTROL
(CLOCK AND PLL)
DIGITAL
FILTER
AND
VOLUME
CONTROL
PRECISION
VOLTAGE
REFERENCE
I²C
CONTROL PORT
DAC
DAC
DAC
DAC
DAC
DAC
DAC
DAC
ANALOG
AUDIO
OUTPUTS
CONTROL DATA
INPUT/OUTPUT
Figure 1.
Rev. 0
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