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PDF AD1865 Data sheet ( Hoja de datos )
| Número de pieza | AD1865 | |
| Descripción | Complete Dual 18-Bit 16 x Fs Audio DAC | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a
Complete Dual 18-Bit
16 ؋ FS Audio DAC
AD1865*
FEATURES
Dual Serial Input, Voltage Output DACs
No External Components Required
110 dB SNR
0.003% THD+N
Operates at 16 ؋ Oversampling per Channel
؎5 Volt Operation
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
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;
4,349,811; 4,855,618; 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.
FUNCTIONAL BLOCK DIAGRAM
(DIP Package)
–VS 1
TRIM 2
MSB
IOUT
3
4
AGND 5
SJ
RF
VOUT
+VL
6
7
8
9
DR 10
LR 11
CLK 12
AD1865
REFERENCE
REFERENCE
24 +VS
23 TRIM
22 MSB
21 IOUT
20 AGND
19 SJ
18 RF
17 VOUT
16 NC
18-BIT
LATCH
18-BIT 18-BIT
D/A D/A
18-BIT
LATCH
15 DL
14 LL
13 DGND
NC = NO CONNECT
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, VL, can be separated from the analog supplies, VS and
–VS, for reduced digital feedthrough. Separate analog and digital
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 × FS.
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
Fax: 617/326-8703
1 page  
100
0dB
90
80
70
0
4 8 12
FREQUENCY – kHz
16
Figure 1. THD+N (dB) vs. Frequency (kHz)
10
Typical Performance Data–AD1865
120
110
100
90
80
0
4
8 12 16
FREQUENCY – kHz
Figure 2. Channel Separation (dB) vs. Frequency (kHz)
1
–60dB
.1
.01
–20dB
0dB
.001
–30 –20 –10 0 10 20 30 40 50 60 70 80 90
TEMPERATURE – °C
Figure 3. THD+N (%) vs. Temperature (°C)
100
90
80
70
60
50
40
0
500 1000 1500 2000 2500 3000
LOAD RESISTANCE – Ω
Figure 4. THD+N (dB) vs. Load Resistance (Ω)
10
8
6
4
2
0
–2
–4
–6
–8
–10
–100 –90 –80 –70 –60 –50 –40 –30 –20 –10
0
INPUT AMPLITUDE – dB
Figure 5. Gain Linearity (dB) vs. Input Amplitude (dB)
REV. 0
–5–
5 Page 
OTHER DIGITAL AUDIO COMPONENTS AVAILABLE
FROM ANALOG DEVICES
AD1865
–VS 1
DGND 2
+VL 3
NC 4
16-BIT
LATCH
SERIAL
INPUT
REGISTER
CLK 5
LE 6
CONTROL
LOGIC
DATA 7
–VL 8
AD1856
NC= NO CONNECT
16-BIT
DAC
IOUT
REF
16 +VS
15 TRIM
14 MSB ADJ
13 IOUT
12 AGND
11 SJ
10 RF
9 VOUT
AD1856 16-BIT AUDIO DAC
Complete, No External Components Required
0.0025% THD
Low Cost
16-Pin DIP or SOIC Package
Standard Pinout
–VS 1
DGND 2
+VL 3
NC 4
18-BIT
LATCH
SERIAL
INPUT
REGISTER
CLK 5
LE 6
CONTROL
LOGIC
DATA 7
–VL 8
AD1860
NC= NO CONNECT
18-BIT
DAC
IOUT
REF
16 +VS
15 TRIM
14 MSB ADJ
13 IOUT
12 AGND
11 SJ
10 RF
9 VOUT
–VS 1
–VS 2
TRIM 3
+VL 4
CLK 5
LE 6
DATA 7
–VL 8
VOLTAGE
REFERENCE
INPUT
&
DIGITAL
OFFSET
20-BIT
DAC
AD1862
16 +VS
15 NR2
14 ADJ
13 NR1
12 AGND
11 IOUT
10 RF
9 DGND
AD1860 18-BIT AUDIO DAC
Complete, No External Components Required
0.0025% THD+N
108 dB Signal-to-Noise Ratio
16-Pin DIP or SOIC Package
Standard Pinout
AD1862 20-BIT AUDIO DAC
119 dB Signal-to-Noise Ratio
0.0016% THD+N
102 dB D-Range Performance
± 1 dB Gain Linearity
16-Pin DIP Package
VL 1
LL 2
DL 3
CLK 4
DR 5
LR 6
DGND 7
VBIASR 8
18-BIT
DAC
18-BIT
SERIAL
REGISTER
18-BIT
SERIAL
REGISTER
18-BIT
DAC
AD1868
16 VBIASL
15 VS
14 VOUTL
VREF
VREF
13 NRL
12 AGND
11 NRR
10 VOUTR
9 VS
REV. 0
AD1868 +5 V SINGLE SUPPLY DUAL 18-BIT
AUDIO DAC
No External Components Required
0.004% THD+N
92 dB D-Range Performance
± 3 dB Gain Linearity
16-Pin DIP or SOIC Package
–11–
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AD1865.PDF ] | |
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