Fast settling permits 2×, 4×, and 8× oversampling
±3 V output
Optional trim allows superlinear performance
±5 V to ±12 V operation
16-lead plastic SOIC package
Compact disc players
Digital audio amplifiers
DAT recorders and players
Synthesizers and keyboards
The AD1856 is a monolithic, 16-bit pulse code modulation (PCM)
audio DAC. The device provides a voltage output amplifier, 16-bit
DAC, 16-bit serial-to-parallel input register, and voltage reference.
The digital portion of the AD1856 is fabricated with CMOS logic
elements that are provided by the Analog Devices, Inc., BiMOS II
process. The analog portion of the AD1856 is fabricated with
bipolar and MOS devices, as well as thin film resistors.
This combination of circuit elements, as well as careful design and
layout techniques, results in high performance audio playback.
Laser trimming of the linearity error affords extremely low total
harmonic distortion. An optional linearity trim pin is provided
to allow residual differential linearity error at midscale to be
eliminated. This feature is particularly valuable for low distortion
reconstructions of low amplitude signals. Output glitch is also
small, contributing to the overall high level of performance. The
output amplifier achieves fast settling and high slew rates, providing
a full ±3 V signal at load currents of up to ±8 mA. The output
amplifier is short-circuit protected and can withstand indefinite
shorts to ground.
The serial input interface consists of the clock, data, and latch
enable pins. The serial twos complement data-word is clocked
into the DAC, MSB first, by the external data clock. The latch
enable signal transfers the input word from the internal serial input
register to the parallel DAC input register. The input clock can
support a 10 MHz clock rate. The serial input port is compatible
with popular digital filter chips used in consumer audio products.
These filters operate at oversampling rates of 2×, 4×, and 8× the
16-Bit PCM Audio DAC
FUNCTIONAL BLOCK DIAGRAM
16-BIT INPUT LATCH
The AD1856 can operate with ±5 V to ±12 V power supplies,
making it suitable for both the portable and home-use markets.
The digital supplies, +VL and −VL, can be separated from the
analog supplies, +VS and −VS, for reduced digital crosstalk.
Separate analog and digital ground pins are also provided.
Power dissipation is 110 mW (typical) with ±5 V supplies and
135 mW (typical) when ±12 V supplies are used.
The AD1856 is packaged in a 16-lead plastic SOIC package
and incorporates the industry-standard pinout. Operation is
guaranteed over the temperature range of −25°C to +70°C and
over the voltage supply range of ±4.75 V to ±13.2 V.
1. Total harmonic distortion is 100% tested.
2. MSB trim feature allows superlinear operation.
3. The AD1856 operates with ±5 V to ±12 V supplies.
4. Serial interface is compatible with digital filter chips.
5. 1.5 μs settling time permits 2×, 4×, and 8× oversampling.
6. No external components are required.
7. 96 dB dynamic range.
8. ±3 V or ±8 mA output capability.
9. 16-bit resolution.
10. Twos complement serial input words.
11. Low cost.
12. 16-lead plastic SOIC package.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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