AD1865 Analog Devices, AD1865 Datasheet

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AD1865

Manufacturer Part Number
AD1865
Description
Complete Dual 18-Bit 16 x Fs Audio DAC
Manufacturer
Analog Devices
Datasheet

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a
PRODUCT DESCRIPTION
The AD1865 is a complete, dual 18-bit DAC offering excellent
THD+N and SNR while requiring no external components. Two
complete signal channels are included. This results in cophased
voltage or current output signals and eliminates the need for
output demultiplexing circuitry. The monolithic AD1865 chip
includes CMOS logic elements, bipolar and MOS linear ele-
ments and laser-trimmed thin-film resistor elements, all fabri-
cated on Analog Devices’ ABCMOS process.
The DACs on the AD1865 chip employ a partially segmented
architecture. The first four MSBs of each DAC are segmented
into 15 elements. The 14 LSBs are produced using standard R-2R
techniques. Segment and R-2R resistors are laser trimmed to pro-
vide extremely low total harmonic distortion. This architecture
minimizes errors at major code transitions resulting in low out-
put glitch and eliminating the need for an external deglitcher.
When used in the current output mode, the AD1865 provides
two 1 mA output signals.
Each channel is equipped with a high performance output am-
plifier. These amplifiers achieve fast settling and high slew rate,
producing 3 V signals at load currents up to 8 mA. Each out-
put amplifier is short-circuit protected and can withstand indefi-
nite short circuits to ground.
The AD1865 was designed to balance two sets of opposing re-
quirements, channel separation and DAC matching. High chan-
nel separation is the result of careful layout. At the same time,
both channels of the AD1865 have been designed to ensure
matched gain and linearity as well as tracking over time and
temperature. This assures optimum performance when used in
stereo and multi-DAC per channel applications.
*Protected by U.S. Patents Nos.: RE 30,586; 3,961,326; 4,141,004;
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.
4,349,811; 4,855,618; 4,857,862.
FEATURES
Dual Serial Input, Voltage Output DACs
No External Components Required
110 dB SNR
0.003% THD+N
Operates at 16
Cophased Outputs
116 dB Channel Separation
Pin Compatible with AD1864
DIP or SOIC Packaging
APPLICATIONS
Multichannel Audio Applications
Compact Disc Players
Multivoice Keyboard Instruments
DAT Players and Recorders
Digital Mixing Consoles
Multimedia Workstations
5 Volt Operation
Oversampling per Channel
A versatile digital interface allows the AD1865 to be directly
connected to standard digital filter chips. This interface employs
five signals: Data Left (DL), Data Right (DR), Latch Left (LL),
Latch Right (LR) and Clock (CLK). DL and DR are the serial
input pins for the left and right DAC input registers. Input data
bits are clocked into the input register on the rising edge of
CLK. A low-going latch edge updates the respective DAC out-
put. For systems using only a single latch signal, LL and LR
may be connected together. For systems using only one DATA
signal, DR and DL may be connected together.
The AD1865 operates with 5 V power supplies. The digital
supply, V
–V
ground pins are also provided. The AD1865 typically dissipates
only 225 mW, with a maximum power dissipation of 260 mW.
The AD1865 is packaged in both a 24-pin plastic DIP and a
28-pin SOIC package. Operation is guaranteed over the temper-
ature range of –25 C to +70 C and over the voltage supply
range of 4.75 V to 5.25 V.
PRODUCT HIGHLIGHTS
11. The AD1865 is a complete dual 18-bit audio DAC.
12. 110 dB signal-to-noise ratio for low noise operation.
13. THD+N is typically 0.003%.
14. Interchannel gain and midscale matching.
15. Output voltages and currents are cophased.
16. Low glitch for improved sound quality.
17. Both channels are 100% tested at 16
18. Low Power—only 225 mW typ, 260 mW max.
19. Five-wire interface for individual DAC control.
10. 24-pin DIP or 28-pin SOIC packages available.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
S
, for reduced digital feedthrough. Separate analog and digital
AGND
TRIM
MSB
V
–V
I
CLK
OUT
+V
OUT
DR
R
LR
SJ
S
L
F
L
, can be separated from the analog supplies, V
10
11
12
4
1
2
3
5
6
7
8
9
FUNCTIONAL BLOCK DIAGRAM
LATCH
18-BIT
REFERENCE
Complete Dual 18-Bit
(DIP Package)
NC = NO CONNECT
18-BIT
16
D/A
AD1865
18-BIT
D/A
REFERENCE
F
S
LATCH
18-BIT
AD1865*
F
Audio DAC
S
.
Fax: 617/326-8703
19
17
16
15
22
20
18
14
13
24
23
21
+V
TRIM
R
I
SJ
V
NC
DL
MSB
LL
DGND
AGND
OUT
F
OUT
S
S
and

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AD1865 Summary of contents

Page 1

... The AD1865 typically dissipates only 225 mW, with a maximum power dissipation of 260 mW. The AD1865 is packaged in both a 24-pin plastic DIP and a 28-pin SOIC package. Operation is guaranteed over the temper- ature range of – +70 C and over the voltage supply range of 4 ...

Page 2

... Gain Linearity ( –90 dB) DRIFT ( +70 C) Gain Drift Midscale Drift TOTAL HARMONIC DISTORTION + NOISE* 0 dB, 990.5 Hz AD1865N, R AD1865N-J, R-J 20 dB, 990.5 Hz AD1865N, R AD1865N-J, R-J –60 dB, 990.5 Hz AD1865N, R AD1865N-J, R-J CHANNEL SEPARATION* 0 dB, 990.5 Hz SIGNAL-TO-NOISE RATIO* ( kHz) D-RANGE* (With A-Weight Filter) – ...

Page 3

... 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 AD1865 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 4

... The signal-to-noise ratio is defined as the ratio of the amplitude of the output when a full-scale code is entered to the amplitude of the output when a midscale code is entered measured using a standard A-Weight filter. SNR for the AD1865 is mea- sured for noise components out to 30 kHz. CHANNEL SEPARATION ...

Page 5

... Figure 1. THD+N (dB) vs. Frequency (kHz) 100 500 1000 1500 2000 LOAD RESISTANCE – Figure 4. THD+N (dB) vs. Load Resistance ( ) REV. 0 Typical Performance Data–AD1865 120 110 0dB 100 Figure 2. Channel Separation (dB) vs. Frequency (kHz .01 .001 –10 0 ...

Page 6

... S age at all times. Though separate positive power supply pins are provided for the analog and digital portions of the AD1865 also possible to use the AD1865 in systems featuring a single +5 V power supply. In this case, both the +V and +V S connected to the single +5 V power supply ...

Page 7

... TIMING Figure 9 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 AD1865 are both TTL and 5 V CMOS compatible. The minimum clock rate of the AD1865 is at least 13.5 MHz. This clock rate allows data transfer rates and ...

Page 8

... SUPPLY 18-BIT CD PLAYER DESIGN Figure 10 illustrates an 18-bit CD player design incorporating an AD1865 D/A converter, an NE5532 dual op amp and the SM5813 digital filter chip manufactured by NPC. In this de- sign, the SM5813 filter transmits left and right digital data to both channels of the AD1865. The left and right latch signals, LL and LR, are both provided by the word clock signal (WCKO) of the digital filter ...

Page 9

... The low power requirements of the AD1865 (approximately 225 mW advantage in a multiple DAC system where any power advan- tage is multiplied by the number of DACs used. The AD1865 requires no external components, simplifying the design, reduc- ing the total number of components required and enhancing reliability ...

Page 10

... AD1865 ADDITIONAL APPLICATIONS Figures 12 through 14 show connection diagrams for the AD1865 and standard digital filter chips from Yamaha, NPC and Sony. Each figure is an example of cophase operation operating for each channel. The 2-pole Rauch low-pass filters shown in S Figure 10 can be used with all of the applications shown in this data sheet ...

Page 11

... DGND AD1868 +5 V SINGLE SUPPLY DUAL 18-BIT BIAS AUDIO DAC No External Components Required 0.004% THD OUT 92 dB D-Range Performance 3 dB Gain Linearity 13 NRL 16-Pin DIP or SOIC Package AGND 12 11 NRR OUT –11– AD1865 ...

Page 12

... AD1865 PIN 1 0.250 (6.35) SEATING PLANE 0.200 (5.05) 0.125 (3.18) 0.708 (18.02) 0.696 (17.67 0.019 (0.49) 0.050 (1.27) BSC 0.014 (0.35) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 24-Pin Plastic DIP (N-24A) Package 24 13 0.580 (14.73) 0.485 (12.32 1.290 (32.70) 1.150 (29.30) 0.060 (1.52) 0.015 (0.38) 0.150 (3.81) 0.022 (0.558) 0.070 (1.77) 0.100 (2.54) 0.014 (0.356) 0.030 (0.77) ...

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