AD1856RZ View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD1856RZ

16-Bit PCM Audio DAC

Analog Devices 

Data Sheet

FEATURES

0.0025% THD

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

Serial input

APPLICATIONS

Compact disc players

Digital audio amplifiers

DAT recorders and players

Synthesizers and keyboards

GENERAL DESCRIPTION

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

sampling frequency.

16-Bit PCM Audio DAC

AD1856

FUNCTIONAL BLOCK DIAGRAM

RF

REFERENCE

16-BIT

IOUT DAC

16-BIT INPUT LATCH

AUDIO

OUTPUT

16-BIT SERIAL-TO-PARALLEL

CONVERSION

CLK

LE DATA

Figure 1.

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.

PRODUCT HIGHLIGHTS

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.

Rev. C

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