EVAL-AD1937AZ Analog Devices Inc, EVAL-AD1937AZ Datasheet - Page 23

• Manufacturer Part Number: EVAL-AD1937AZ
• Description: EB Single Chip Codec 4 ADCs W/Diff Outp
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD1937AZ

• Main Purpose: Audio, CODEC
• Utilized Ic / Part: AD1937
• Primary Attributes: 24-Bit, 192 kHz, 4 ADCs: 107dB Dynamic Range, 8 DACs: 112dB Dynamic Range
• Secondary Attributes: Time Division Multiplexed (TDM), I2C, and SPI Interface, Popguard® Technology
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Embedded: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DAISY-CHAIN MODE
The AD1937 also allows a daisy-chain configuration to expand
the system to 16 DACs and 8 ADCs (see Figure 22 to Figure 26).
In this mode, the DBCLK frequency is 512 × f
slots of the TDM DAC data stream belong to the first AD1937
in the chain and the last eight slots belong to the second AD1937.
The second AD1937 is the device attached to the DSP TDM port.
To accommodate 16 channels at a 96 kHz sample rate, the
AD1937 can be configured into a dual-line, TDM mode as
shown in Figure 23. This mode allows a slower DBCLK than
normally required by the one-line TDM mode. The first four
channels of each TDM input belong to the first AD1937 in the
chain and the last four channels belong to the second AD1937.
The dual-line TDM mode can also be used to send data at a
192 kHz sample rate into the AD1937, as shown in Figure 24.
DSDATA2 (TDM DAC DATA OUT)
DSDATA1 (TDM ADC DATA IN)
(TDM DAC2 DATA OUT)
(TDM DAC DATA OUT)
OF THE SECOND AD1937;
(TDM DAC2 DATA IN)
OF THE SECOND AD1937
(TDM DAC DATA IN)
TO THE FIRST AD1937
THIS IS THE TDM
DSDATA1
DSDATA2
DSDATA3
DSDATA4
DLRCLK
DBCLK
DLRCLK
DBCLK
AD1937
FIRST
AD1937
FIRST
DAC1L
DAC3L
DAC1L
8 DAC CHANNELS OF THE FIRST IC IN THE CHAIN
SECOND
AD1937
MSB
8 DAC CHANNELS OF THE FIRST IC IN THE CHAIN
Figure 22. Single-Line Daisy-Chain TDM Mode 16-Channel 48 kHz DAC Configuration
DAC1R
SECOND
AD1937
Figure 23. Dual-Line Daisy-Chain TDM Mode16-Channel 96 kHz DAC Configuration
DAC1R
DAC3R
DAC2L
32 BITS
DSP
8 UNUSED SLOTS
S
. The first eight
DAC2R
DSP
DAC2L
DAC4L
DAC3L
DAC3R
Rev. B | Page 23 of 36
DAC2R
DAC4R
DAC4L
DAC4R
There are two configurations for the ADC port to work in
daisy-chain mode. The first configuration is with an ABCLK
at 256 × f
ABCLK at 512 × f
ABCLK mode, the ADC channels occupy the first eight
slots; the second eight slots are empty. The TDM ADC data
in (ASDATA2) port of the first AD1937 must be grounded
in all modes of operation.
The I/O pins of the serial ports are defined according to the
serial mode selected. See Table 19 for a detailed description
of the function of each pin. See Figure 27 for a typical AD1937
configuration with two external stereo DACs and two external
stereo ADCs.
DAC1L
DAC1L
DAC3L
DAC3L
8 DAC CHANNELS OF THE SECOND IC IN THE CHAIN
DAC1L
DAC1L
8 DAC CHANNELS OF THE SECOND IC IN THE CHAIN
MSB
S
32 BITS
, see Figure 25. The second configuration is with an
DAC1R
DAC1R
DAC1R
DAC1R
DAC3R
DAC3R
DAC2L
DAC2L
S
, see Figure 26. Note that in the 512 × f
DAC2R
DAC2R
DAC2L
DAC2L
DAC4L
DAC4L
DAC3L
DAC3L
DAC3R
DAC3R
DAC2R
DAC2R
DAC4R
DAC4R
DAC4L
DAC4L
DAC4R
DAC4R
AD1937
S