AD1866 Analog Devices, AD1866 Datasheet

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AD1866

Manufacturer Part Number
AD1866
Description
Single Supply Dual 16-Bit Audio DAC
Manufacturer
Analog Devices
Datasheet

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a
PRODUCT DESCRIPTION
The AD1866 is a complete dual 16-bit DAC offering excellent
performance while requiring a single +5 V power supply. It is
fabricated on Analog Devices’ ABCMOS wafer fabrication
process. The monolithic chip includes CMOS logic elements,
bipolar and MOS linear elements and laser trimmed, thin-
film resistor elements. Careful design and layout techniques
have resulted in low distortion, low noise, high channel separa-
tion and low power dissipation.
The DACs on the AD1866 chip employ a partially segmented
architecture. The first three MSBs of each DAC are segmented
into 7 elements. The 13 LSBs are produced using standard
R-2R techniques. The segments and R-2R resistors are laser
trimmed to provide extremely low total harmonic distortion.
The AD1866 requires no deglitcher or trimming circuitry.
Each DAC is equipped with a high performance output ampli-
fier. These amplifiers achieve fast settling and high slew rate,
producing 1 V signals at load currents up to 1 mA. The buff-
ered output signal range is 1.5 V to 3.5 V. The 2.5 V reference
voltages eliminate the need for “false ground” networks.
A versatile digital interface allows the AD1866 to be directly
connected to all digital filter chips. Fast CMOS logic elements
allow for an input clock rate of up to 16 MHz. This allows for
operation at 2 , 4 , 8 , or 16 the sampling frequency (where
F
AD1866 are TTL and +5 V CMOS compatible.
*Protected by U.S. Patent Nos: 3,961,326; 4,141,004; 4,349,811; 4,857,862;
REV. 0
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
and patents pending.
S
= 44.1 kHz) for each channel. The digital input pins of the
FEATURES
Dual Serial Input, Voltage Output DACs
Single +5 Volt Supply
0.005% THD+N
Low Power –50 mW
115 dB Channel Separation
Operates at 8
16-Pin Plastic DIP or SOIC Package
APPLICATIONS
Multimedia Workstations
PC Audio Add-In Boards
Portable CD and DAT Players
Automotive CD and DAT Players
Noise Cancellation
Oversampling
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
The AD1866 operates on +5 V power supplies. The digital
supply, V
duced digital feedthrough. Separate analog and digital ground
pins are also provided. In systems employing a single +5 volt
power supply, V
tery operated systems, operation will continue even with re-
duced supply voltage. Typically, the AD1866 dissipates 50 mW.
The AD1866 is packaged in either a 16-pin plastic DIP or a
16-pin plastic SOIC package. Operation is guaranteed over the
temperature range of –35 C to +85 C and over the voltage
supply range of 4.75 V to 5.25 V.
PRODUCT HIGHLIGHTS
1. Single supply operation @ +5 V.
2. 50 mW power dissipation.
3. THD+N is 0.005% (typical).
4. Signal-to-Noise Ratio is 95 dB (typical).
5. 115 dB channel separation (typical).
6. Compatible with all digital filter chips.
7. 16-pin DIP and 16-pin SOIC packages.
8. No deglitcher required.
9. No external adjustments required.
L
DGND
, can be separated from the analog supply, V
CLK
V
DL
DR
LR
B
V
LL
FUNCTIONAL BLOCK DIAGRAM
R
L
8
5
7
1
2
6
3
4
L
and V
Dual 16-Bit Audio DAC
REGISTER
REGISTER
SERIAL
SERIAL
16-BIT
16-BIT
S
16-BIT
16-BIT
DAC
DAC
should be connected together. In bat-
AD1866
V REF
V
REF
Single Supply
AD1866*
16
15
14
13
12
11
10
9
Fax: 617/326-8703
NRL
NRR
V
V
V
V
AGND
V
O
B
O
S
S
L
R
L
S
, for re-

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AD1866 Summary of contents

Page 1

... Typically, the AD1866 dissipates 50 mW. The AD1866 is packaged in either a 16-pin plastic DIP or a 16-pin plastic SOIC package. Operation is guaranteed over the temperature range of – +85 C and over the voltage supply range of 4 ...

Page 2

... DRIFT ( +70 C) Gain Drift Midscale Drift TOTAL HARMONIC DISTORTION + NOISE 0 dB, 990.5 Hz AD1866N AD1866R –20 dB, 990.5 Hz AD1866N AD1866R –60 dB, 990.5 Hz AD1866N AD1866R CHANNEL SEPARATION (1 kHz, 0 dB) SIGNAL-TO-NOISE RATIO (With A-Weight Filter) D-RANGE (With A-Weight Filter) OUTPUT Voltage Output Pins ( ...

Page 3

... Figure 2. Channel Separation vs. Frequency –30 –40 –50 –60 –70 –80 –90 –100 4.4 4.6 4.8 5.0 SUPPLY VOLTAGE Figure 3. THD+N vs. Supply Voltage REV. 0 Typical Performance–AD1866 –2 –4 –20dB –6 0dB –8 –100 15500 20500 Figure 4. Gain Linearity Error vs. Input Amplitude –30 –40 – ...

Page 4

... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD1866 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...

Page 5

... DAC. Midscale error is expressed in mV. REV. 0 Definition of Specifications–AD1866 FUNCTIONAL DESCRIPTION The AD1866 is a complete, monolithic dual 16-bit digital audio DAC which runs off a single +5 volt supply. As shown in the block diagram, each channel contains a voltage reference, a 16-bit serial-to-parallel input register, a 16-bit input latch, a 16-bit DAC, and an output amplifier ...

Page 6

... Figure 7 illustrates the correct connection of the digital and analog supply bypass capacitors. An important feature of the AD1866 audio DAC is its ability to operate at diminished power supply voltages. This feature is very important in portable battery operated systems. As the bat- teries discharge, the supply voltage drops. Unlike any other au- dio DAC, the AD1866 can continue to function at supply voltages as low as 3 ...

Page 7

... DAC for a desired level of performance. Figure 1 illustrates the typical THD+N versus frequency performance of the AD1866 evident that the THD+N performance of the AD1866 re- mains stable at all three amplitude levels through a wide range of frequencies. A load impedance of at least recom- mended for best THD+N performance. ...

Page 8

... Figure 9 illustrates the general signal requirements for data transfer for the AD1866. TIMING Figure 10 illustrates the specific timing requirements that must be met in order for the data transfer to be accomplished prop- erly. The input pins of the AD1866 are both TTL and +5 V CMOS compatible. Figure 9. AD1866 Control Signals DR/DL >10ns CLK > ...

Page 9

... This high performance, single supply design op- erates plications. In this design, the CXD2550P filter transmits left and right channel digital data to the AD1866. The left and right latch signals, LL and LR, are both provided by the word clock signal (LRCKO) of the digital filter. The digital data is con- verted to low distortion output voltages by the output amplifiers on the AD1866 ...

Page 10

... OW18 OW20 15 14 COB Figure 12. AD1866 with NPC SM5813 Digital Filter SM5818AP BCKO 15 3 WDCO DOR DOL OMOD1 Figure 13. AD1866 with NPC SM5818AP Digital Filter ...

Page 11

... YM3434 16/ BCO 6 WCO 11 7 DRO DLO DD Figure 14. AD1866 with Yamaha YM3434 Digital Filter SM5840A BCKO BCK 4 BCKO OW20 WCKO 13 6 WCK O DOL ...

Page 12

... AD1866 Plastic DIP (N) Package 9 16 0.25 (6.35 0.87 (22.1) MAX 0.035 (0.89) 0.125 0.18 (3.18) (4.57) MIN 0.018 (0.46) 0.033 (0.84) 0.1 (2.54) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 0.31 (7.87) 0.18 (4.57) MAX 0.011 (0.28) 0.3 (7.62) –12– Plastic SOIC (R) Package 16 9 0.419 0.299 (10.65) (7.60 0.413 (10.50) 0.104 (2.65) 0.012 (0.3) 0.019 (0.49) 0.05 (1.27) REF 0.030 (0.75) 0.042 (1.07) 0.013 (0.32) REV. 0 ...

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