AD1868R-J Analog Devices Inc, AD1868R-J Datasheet

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AD1868R-J

Manufacturer Part Number
AD1868R-J
Description
IC DAC AUDIO DUAL SNGL 16SOIC
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD1868R-J

Rohs Status
RoHS non-compliant
Number Of Bits
18
Data Interface
Serial
Number Of Converters
2
Voltage Supply Source
Analog and Digital
Power Dissipation (max)
70mW
Operating Temperature
-35°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (0.300", 7.5mm Width)
Settling Time
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AD1868R-J
Manufacturer:
ADI/亚德诺
Quantity:
20 000
a
PRODUCT DESCRIPTION
The 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. The 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.
The DACs on the AD1868 chip employ a partially segmented
architecture. The first three MSBs of each DAC are segmented
into seven elements. The 15 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 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. These amplifiers achieve fast settling and high slew rate,
producing 1 V signals at load currents up to 1 mA. The
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. This allows for
operation at 2 , 4 , 8 , or 16 the sampling frequency for each
channel. The digital input pins of the AD1868 are TTL and
+5 V CMOS compatible.
*Protected by U.S. Patent Numbers: 3,961,326; 4,141,004; 4,349,811;
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.
4,857,862; and patents pending.
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
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
Oversampling
The AD1868 operates on +5 V power supplies. The digital sup-
ply, V
duced digital feedthrough. Separate analog and digital ground
pins are also provided. In systems employing a single +5 volt
power supply, V
PRODUCT HIGHLIGHTS
1. Single-supply operation @ +5 V.
2. 50 mW power dissipation (typical).
3. THD+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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
tery operated systems, operation will continue even with reduced
supply voltage. Typically, the AD1868 dissipates 50 mW.
The 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.
L
, can be separated from the analog supply, V
DGND
V
CK
DR
LL
DL
LR
B
V
R
L
FUNCTIONAL BLOCK DIAGRAM
1
2
4
5
6
8
3
7
L
and V
Dual 18-Bit Audio DAC
REGISTER
REGISTER
18-BIT
18-BIT
DAC
SERIAL
SERIAL
DAC
18-BIT
18-BIT
S
should be connected together. In bat-
V
V
AD1868
REF
REF
Single Supply
+
+
AD1868*
13
14
10
16
15
12
11
9
Fax: 617/326-8703
V
V
NRL
AGND
V
V
NRR
V
S
O
O
B
S
S
L
L
R
, for re-

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AD1868R-J Summary of contents

Page 1

FEATURES Dual Serial Input, Voltage Output DACs Single +5 V Supply 0.004% THD+N (typ) Low Power (typ) 108 dB Channel Separation (min) Operates at 8 Oversampling 16-Pin Plastic DIP or SOIC Package APPLICATIONS Portable Compact Disc Players ...

Page 2

AD1868–SPECIFICATIONS RESOLUTION DIGITAL INPUTS DGND IL IL Maximum Clock Input Frequency ACCURACY Gain Error Gain Matching Midscale Error Midscale Error Matching Gain Linearity Error ...

Page 3

Typical Performance of the AD1868 –30 –40 –50 –60 –70 –80 –90 –100 0.5 2.5 4.5 6.5 8.5 10.5 12.5 14.5 FREQUENCY – kHz Figure 1. THD+N vs. Frequency –20 –30 –40 –50 –60 –70 –80 –90 4.4 4.6 4.8 ...

Page 4

... Midscale error is the difference between the analog output and the bias when the twos complement input code representing midscale is loaded in the input register. Midscale error is ex- pressed in mV. ORDERING GUIDE THD + N Model @ F S AD1868N 0.008% AD1868R 0.008% AD1868N-J 0.006% AD1868R-J 0.006 Plastic DIP SOIC ...

Page 5

AD1868 18-BIT DAC 18-BIT LL SERIAL REGISTER REF 18-BIT SERIAL REGISTER V REF LR 6 DGND 7 18-BIT DAC Functional Block Diagram ANALOG CIRCUIT CONSIDERATIONS ...

Page 6

AD1868 AD1868 NRL AGND NRR DGND V 9 ...

Page 7

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 AD1868 are TTL and 5 V CMOS compatible. The maximum clock rate ...

Page 8

AD1868 ADDITIONAL APPLICATIONS In addition to CD player designs, the AD1868 is suitable for similar applications such as DAT, portable musical instru- ments, Laptop and Notebook personal computers, and PC au- dio I/O boards. The circuit techniques illustrated are directly ...

Page 9

YM3434 16/ BCO 6 11 WCO 10 7 DRO DLO DD Figure 14. AD1868 with Yamaha YM3434 Digital Filter OTHER ...

Page 10

AD1868 – 16-BIT 16-BIT LATCH DAC DGND 2 +V SERIAL L 3 INPUT REGISTER NC 4 CLK 5 CONTROL LOGIC LE 6 DATA AD1851 CONNECT AD1851 16-Bit PCM Audio DAC 107 dB ...

Page 11

REV. A –V VOLTAGE 1 S REFERENCE – TRIM + CLK 5 INPUT & 20-BIT 6 DIGITAL DAC LE OFFSET 7 DATA – AD1862 AD1862 20-Bit, Low Noise Audio DAC 110 dB SNR ...

Page 12

AD1868 (4.57) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). Plastic DIP (N) Package 16 9 0.31 0.25 (7.87) (6.35 0.87 (22.1) MAX 0.035 (0.89) 0.18 0.125 (3.18) MIN 0.033 (0.84) 0.1 (2.54) 0.018 (0.46) Plastic SOIC (R) ...

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