The AD1895 is a 24-bit, high performance, single-chip, second generation asynchronous sample rate converter. Based upon Analog Devices’ experience with its first asynchronous sample rate converter, the AD1890, the AD1895 offers improved performance and additional features. This improved performance includes a THD + N range of –115 dB to –122 dB depending on sample rate and input frequency, 128 dB (A-Weighted) dynamic range, 192 kHz sampling frequencies for both input and output sample rates, improved jitter rejection, and 1:8 upsampling and 7.75:1 downsampling ratios. Additional features include more serial formats, a bypass mode, and better interfacing to digital signal processors. The AD1895 has a 3-wire interface for the serial input and output ports that supports left-justified, I2S, and right-justified (16-, 18-, 20-, 24-bit) modes. Additionally, the serial output port supports TDM Mode for daisy-chaining multiple AD1895s to a digital signal processor. The serial output data is dithered down to 20, 18, or 16 bits when 20-, 18-, or 16-bit output data is selected. The AD1895 sample rate converts the data from the serial input port to the sample rate of the serial output port. The sample rate at the serial input port can be asynchronous with respect to the output sample rate of the output serial port. The master clock to the AD1895, MCLK, can be asynchronous to both the serial input and output ports.
Four 10-Bit Video DACs (4:2:2, YCrCb, RGB I/P Supported)
10-Bit Video Rate Digitization at up to 54 MHz
AGC Control ( 6 dB)
Front End 3-Channel Clamp Control
Up to Five CVBS Input Channels, Two Component YUV, Three S-Video, or a Combination of the Above. Simultaneous Digitization of Two CVBS Input Channels
Aux 8-Bit SAR ADC @ 843 kHz Sampling Giving up to Eight General-Purpose Inputs
I2C Compatible Interface with I2C Filter
RGB Inputs for Picture-on-Picture of the RGB DACs
Optional Internal Reference
Power Save Mode
APPLICATIONS: Picture-on-Picture Video Systems, Simultaneous Video Rate Processing, Hybrid Set-Top Box TV Systems. Direct Digital Synthesis/I-Q Demodulation, Image Processing
Converter Signal Types - Audio
Converter Type - Other
Spec Sheet available - Yes
Operating Temperature (Maximum):
221 F
Operating Temperature (Minimum):
-40 F
Resolution:
24 bits
Sample Rate:
192 kHz
Input Clock:
30 MHz
Load Capacitance:
50 pF
Supply Voltage:
3.3 to 5 V
Input Current:
±10 mA
DNR w/ Filter (+dB):
125 dB
THD+N @ 1kHz Input:
-110 dB
Ratios:
7.75:1, 8:1
AD1896
- 192 kHz Stereo Asynchronous Sample Rate Converter, 142dB Signal to Noise Ratio