AKM’s AK4687 is an asynchronous stereo CODEC with two input selectors and line drivers. The ADC/DAC interface of the AK4687 can receive up to 24-bit input data and supports asynchronous operation. The input orientation of the preamp supports three-channel stereo inputs, selectable via external resistors. Both the input stereo selector and output driver support ground-referenced 2Vrms input/output, making it possible to get rid of AC coupling capacitors and reduce external components. The AK4687 has a dynamic range of 99dB for ADC and 105dB for DAC. The device is suitable for digital recording systems, digital TVs, Blu-ray disc players and home theaters.
AK4687 main features
• Asynchronous ADC/DAC operation
• 3:1 capless stereo line input selector
• 24-bit stereo ADC
64x oversampling
Figure 1 AK4687 block diagram
Figure 2 Typical connection diagram of AK4687 (I2C control mode, CAD0 pin = “L”, master mode)
– Sampling rate up to 48kHz
– Linear phase digital antialiasing filter
– S/(N+D): 83dB
– Dynamic range S/N: 99dB
– Digital HPF for offset cancellation
• 24-bit dual stereo DAC
– 128x oversampling
– Sampling rate up to 192kHz
– 24-bit 8x digital filter
– S/(N+D): 95dB
– Dynamic range S/N: 105dB
– De-emphasis filter
• High jitter tolerance
• External master clock input:
256fs, 384fs, 512fs 768fs
(fs=32kHz~48kHz)
128fs, 192fs, 256fs 384fs
(fs=64kHz~96kHz)128fs, 192fs (fs=128kHz~192kHz)
• Dual audio serial I/F (PORT1, PORT2)
– Master/Slave Mode (PORT1)
– I/F format
• PORT2: MSB, LSB adjusted (16-bit/24-bit), I2S
• PORT1: MSB, LSB adjusted (16-bit/24-bit), I2S
• Hardware/I2C bus control
Figure 3 Typical connection diagram of AK4687 (H/W control mode, MCLK=768fs, master mode)
Figure 4 Block diagram of the evaluation board AKD4687
•Operating Voltage
– Digital I/O and charge pump: 3.0V~3.6V
– DAC analog: 3.0V~3.6V
• Package: 48-pin QFP
Evaluation Board AKD4687-A
The evaluation board for the AK4687, the AKD4687-A, is a single-chip 24-bit CODEC with dual-channel ADC and dual-channel DAC. It can evaluate not only the A/D and D/A conversion of the AK4687, but also the asynchronous operation characteristics. In addition, the evaluation board can easily interface with digital audio equipment through the S/PDIF connector.
AKD4687-A Features
• Compatible with two types of digital audio interfaces
– BNC (S/PDIF) input/output with DIT/DIR (AK4118A)
– 10-pin header for register control
For details, see:
http://solution.eccn.com/solution_2011092810252825.htm
GEC
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