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| 型號： | AD1868* |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Single Supply Dual 18-Bit Audio DAC |
| 中文描述： | 單電源雙18位音頻DAC |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 246K |
FUNCT IONAL BLOCK DIAGRAM
1
2
3
4
5
6
7
8
9
10
12
13
14
15
11
16
18-BIT
DAC
18-BIT
SERIAL
REGISTER
18-BIT
SERIAL
REGISTER
AD1868
LL
DL
CK
DR
LR
DGND
NRL
AGND
NRR
V
L
V
B
R
V
B
L
V
S
V
O
L
V
O
R
V
S
18-BIT
DAC
–
+
–
+
V
REF
V
REF
REV. A
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.
a
Single Supply
Dual 18-Bit Audio DAC
AD1868*
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
FEATURES
Dual Serial Input, Voltage Output DACs
Single +5 V Supply
0.004% THD+N (typ)
Low Power: 50 mW (typ)
108 dB Channel Separation (min)
Operates at 8
3
Oversampling
16-Pin Plastic DIP or SOIC Package
APPLICATIONS
Portable Compact Disc Players
Portable DAT Players and Recorders
Automotive Compact Disc Players
Automotive DAT Players
Multimedia Workstations
PRODUCT DE SCRIPT ION
T he AD1868 is a complete dual 18-bit DAC offering excellent
performance while requiring a single +5 V power supply. It is
fabricated on Analog Devices’ ABCMOS wafer fabrication pro-
cess. T he monolithic chip includes CMOS logic elements, bipo-
lar and MOS linear elements, and laser-trimmed thin-film
resistor elements. Careful design and layout techniques have re-
sulted in low distortion, low noise, high channel separation, and
low power dissipation.
T he DACs on the AD1868 chip employ a partially segmented
architecture. T he first three MSBs of each DAC are segmented
into seven elements. T he 15 LSBs are produced using standard
R-2R techniques. T he segments and R-2R resistors are laser
trimmed to provide extremely low total harmonic distortion.
T he AD1868 requires no deglitcher or trimming circuitry. Low
noise is achieved through the use of two noise-reduction capacitors.
Each DAC is equipped with a high performance output ampli-
fier. T hese amplifiers achieve fast settling and high slew rate,
producing
±
1 V signals at load currents up to
±
1 mA. T he
buffered output signal range is 1.5 V to 3.5 V. Reference volt-
ages of 2.5 V are provided, eliminating the need for “False
Ground” networks.
A versatile digital interface allows the AD1868 to be directly
connected to all digital filter chips. Fast CMOS logic elements
allow for an input clock rate of up to 13.5 MHz. T his allows for
operation at 2
×
, 4
×
, 8
×
, or 16
×
the sampling frequency for each
channel. T he digital input pins of the AD1868 are T T L and
+5 V CMOS compatible.
*
Protected by U.S. Patent Numbers: 3,961,326; 4,141,004; 4,349,811;
4,857,862; and patents pending.
T he AD1868 operates on +5 V power supplies. T he digital sup-
ply, V
L
, can be separated from the analog supply, V
S
, for re-
duced digital feedthrough. Separate analog and digital ground
pins are also provided. In systems employing a single +5 volt
power supply, V
L
and V
S
should be connected together. In bat-
tery operated systems, operation will continue even with reduced
supply voltage. T ypically, the AD1868 dissipates 50 mW.
T he AD1868 is packaged in either a 16-pin plastic DIP or a 16-
pin plastic SOIC package. Operation is guaranteed over the tem-
perature range of –35
°
C to +85
°
C and over the voltage supply
range of 4.75 V to 5.25 V.
PRODUCT HIGHLIGHT S
1. Single-supply operation
@ +
5 V.
2. 50 mW power dissipation (typical).
3. T HD+N is 0.004% (typical).
4. Signal-to-Noise Ratio is 97.5 dB (typical).
5. 108 dB channel separation (minimum).
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.
相關PDF資料 |
PDF描述 |
|---|---|
| AD1868N-J | Single Supply Dual 18-Bit Audio DAC |
| AD1868R-J | Single Supply Dual 18-Bit Audio DAC |
| AD1870 | Single-Supply 16-Bit Stereo ADC |
| AD1870JR | Single-Supply 16-Bit Stereo ADC |
| AD1871 | Stereo Audio, 24-Bit, 96 kHz, Multibit ADC |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD1868N | 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 18-bit 16-Pin PDIP Tube 制造商:Rochester Electronics LLC 功能描述:IC, MONO 18-BIT AUDIO DAC - Bulk 制造商:Analog Devices 功能描述:18BIT DAC DUAL AUDIO 1868 DIP16 |
| AD1868N-J | 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 18-bit 16-Pin PDIP Tube 制造商:Analog Devices 功能描述:DAC 2CH R-2R 18BIT 16PDIP - Rail/Tube 制造商:Rochester Electronics LLC 功能描述:IC, MONO 18-BIT AUDIO DAC - Bulk |
| AD1868NZ | 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 18-bit 16-Pin PDIP Tube 制造商:Analog Devices 功能描述:DAC 2CH R-2R 18BIT 16PDIP - Rail/Tube |
| AD1868R | 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 18-bit 16-Pin SOIC N 制造商:Analog Devices 功能描述:IC MONO 18-BIT AUDIO DAC |
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