AD AD1861R 16-bit/18-bit, 16x3 fs pcm audio dac Datasheet

a
FEATURES
110 dB SNR
Fast Settling Permits 163 Oversampling
63 V Output
Optional Trim Allows Super-Linear Performance
65 V Operation
16-Pin Plastic DIP and SOIC Packages
Pin-Compatible with AD1856 & AD1860 Audio DACs
2s Complement, Serial Input
APPLICATIONS
High-End Compact Disc Players
Digital Audio Amplifiers
DAT Recorders and Players
Synthesizers and Keyboards
16-Bit/18-Bit, 16 3 FS
PCM Audio DACs
AD1851/AD1861
FUNCTIONAL BLOCK DIAGRAM
–VS
1
DGND
2
+VL
3
NC
4
CLK
5
LE
6
DATA
7
NC
8
LATCH
DAC
SERIAL
INPUT
REGISTER
IOUT
CONTROL
LOGIC
AD1851/
AD1861
16
+VS
15
TRIM
14
MSB ADJ
13
IOUT
12
AGND
11
SJ
10
RF
9
VOUT
NC = NO CONNECT
PRODUCT DESCRIPTION
The AD1851/AD1861 is a monolithic PCM audio DAC. The
AD1851 is a 16-bit device, while the AD1861 is an 18-bit device. Each device provides a voltage output amplifier, DAC,
serial-to-parallel register and voltage reference. The digital portion of the AD1851/AD1861 is fabricated with CMOS logic
elements that are provided by Analog Devices’ 2 µm ABCMOS
process. The analog portion of the AD1851/AD1861 is fabricated with bipolar and MOS devices as well as thin-film
resistors.
This combination of circuit elements, as well as careful design
and layout techniques, results in high performance audio playback. Laser-trimming of the linearity error affords low total harmonic distortion. An optional linearity trim pin is provided to
allow residual differential linearity error at midscale to be eliminated. This feature is particularly valuable for low distortion
reproductions of low amplitude signals. Output glitch is also
small, contributing to the overall high level of performance. The
output amplifier achieves fast settling and high slew rates, providing a full ± 3 V signal at load currents up to 8 mA. When
used in current output mode, the AD1851/AD1861 provides a
± 1 mA output signal. The output amplifier is short circuit
protected and can withstand indefinite shorts to ground.
The serial input interface consists of the clock, data and latch
enable pins. The serial 2s complement data word is clocked into
the DAC, MSB first, by the external clock. The latch enable
signal transfers the input word from the internal serial input
register to the parallel DAC input register. The AD1851 input
clock can support a 12.5 MHz data rate, while the AD1861 input clock can support a 13.5 MHz data rate. This serial input
port is compatible with second generation digital filter chips
used in consumer audio products. These filters operate at oversampling rates of 23, 43, 83 and 163 sampling frequencies.
The critical specifications of THD+N and signal-to-noise ratio
are 100% tested for all devices.
The AD1851/AD1861 operates with ± 5 V power supplies, making it suitable for home use markets. The digital supply, VL, can
be separated from the analog supplies, VS and –VS, for reduced
digital crosstalk. Separate analog and digital ground pins are
also provided. Power dissipation is 100 mW typical.
The AD1851/AD1861 is available in either a 16-pin plastic DIP
or a 16-pin plastic SOIC package. Both packages incorporate
the industry standard pinout found on the AD1856 and
AD1860 PCM audio DACs. As a result, the AD1851/AD1861
is a drop-in replacement for designs where ± 5 V supplies have
been used with the AD1856/AD1860. Operation is guaranteed
over the temperature range of –25°C to +70°C and over the
voltage supply range of ± 4.75 V to ± 5.25 V.
PRODUCT HIGHLIGHTS
l. AD1851 16-bit resolution provides 96 dB dynamic range.
AD1861 18-bit resolution provides 108 dB dynamic range.
2. No external components are required.
3. Operates with ± 5 V supplies.
4. Space saving 16-pin SOIC and plastic DIP packages.
5. 100 mW power dissipation.
6. High input clock data rates and 1.5 µs settling time permits
23, 43, 83 and 163 oversampling.
7. ± 3 V or ± 1 mA output capability.
8. THD + Noise and SNR are 100% tested.
9. Pin-compatible with AD1856 & AD1860 PCM audio DACs.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
AD1851/AD1861–SPECIFICATIONS (T @ +258C and 65 V supplies, unless otherwise noted)
A
Min
DIGITAL INPUTS
VIH
VIL
IIH, VIH = VL
IIL, VIL = 0.4
Typ
2.0
Max
Units
+VL
0.8
1.0
–10
V
V
µA
µA
ACCURACY
Gain Error
Midscale Output Voltage
±1
± 10
%
mV
DRIFT (0°C to +70°C)
Total Drift
Bipolar Zero Drift
± 25
±4
ppm of FSR/°C
ppm of FSR/°C
SETTLING TIME (To ± 0.0015% of FSR)
Voltage Output
6 V Step
1 LSB Step
Slew Rate
Current Output
1 mA Step 10 Ω to 100 Ω Load
1 kΩ Load
1.5
1.0
9
µs
µs
V/µs
350
350
ns
ns
OUTPUT
Voltage Output Configuration
Bipolar Range
Output Current
Output Impedance
Short Circuit Duration
Current Output Configuration
Bipolar Range (± 30%)
Output Impedance (± 30%)
± 3.0
62.88
±8
63.12
V
mA
Ω
0.1
Indefinite to Common
± 1.0
1.7
POWER SUPPLY
Voltage
+VL and +VS
–VS
4.75
–5.25
TEMPERATURE RANGE
Specification
Operation
Storage
0
–25
–60
WARM-UP TIME
1
mA
kΩ
+25
5.25
–4.75
V
V
+70
+70
+100
°C
°C
°C
min
Specifications subject to change without notice.
–VS
1
DGND
2
+VL
3
NC
4
CLK
5
16-BIT
LATCH
16-BIT
DAC
SERIAL
INPUT
REGISTER
IOUT
16
+VS
15
TRIM
14
MSB ADJ
13
IOUT
12
AGND
CONTROL
LOGIC
–VS
1
DGND
2
+VL
3
NC
4
CLK
5
16-BIT
LATCH
16-BIT
DAC
SERIAL
INPUT
REGISTER
IOUT
16
+VS
15
TRIM
14
MSB ADJ
13
IOUT
12
AGND
CONTROL
LOGIC
LE
6
11
SJ
LE
6
11
SJ
DATA
7
10
RF
DATA
7
10
RF
NC
8
NC
8
AD1851
9
VOUT
NC = NO CONNECT
AD1851
9
VOUT
NC = NO CONNECT
AD1851 Functional Block Diagram
AD1861 Functional Block Diagram
–2–
REV. A
AD1851/AD1861
AD1851
Min
Typ
Max
Units
16
Bits
0.003
0.004
0.004
0.008
%
%
0.009
0.009
0.016
0.040
%
%
0.9
0.9
1.6
4.0
%
%
RESOLUTION
TOTAL HARMONIC DISTORTION + NOISE
0 dB, 990.5 Hz
AD1851N-J, R-J
AD1851N, R
–20 dB, 990.5 Hz
AD1851N-J, R-J
AD1851N, R
–60 dB, 990.5 Hz
AD1851N-J, R-J
AD1851N, R
D-RANGE* (With A-Weight Filter)
–60 dB, 990.5 Hz AD1851N, R
AD1851N-J, R-J
88
96
SIGNAL-TO-NOISE RATIO
107
MAXIMUM CLOCK INPUT FREQUENCY
12.5
dB
dB
110
dB
MHz
ACCURACY
Differential Linearity Error
± 0.001
% of FSR
MONOTONICITY
14
Bits
POWER SUPPLY
Current
+I
–I
Power Dissipation
10.0
–10.0
100
13.0
–15.0
mA
mA
mW
Typ
Max
Units
18
Bits
0.003
0.004
0.004
0.008
%
%
0.009
0.009
0.016
0.040
%
%
0.9
0.9
1.6
4.0
%
%
AD1861
Min
RESOLUTION
TOTAL HARMONIC DISTORTION + NOISE
0 dB, 990.5 Hz
AD1861N-J, R-J
AD1861N, R
–20 dB, 990.5 Hz
AD1861N-J, R-J
AD1861N, R
–60 dB, 990.5 Hz
AD1861N-J, R-J
AD1861N, R
D-RANGE* (With A-Weight Filter)
–60 dB, 990.5 Hz AD1861N, R
AD1861N-J, R-J
88
96
SIGNAL-TO-NOISE RATIO
107
MAXIMUM CLOCK INPUT FREQUENCY
13.5
dB
dB
110
dB
MHz
ACCURACY
Differential Linearity Error
± 0.001
% of FSR
MONOTONICITY
15
Bits
POWER SUPPLY
Current
+I
–I
Power Dissipation
10.0
–10.0
100
*Tested in accordance with EIAJ Test Standard CP-307.
Specifications subject to change without notice.
REV. A
–3–
13.0
–15.0
mA
mA
mW
AD1851/AD1861
ABSOLUTE MAXIMUM RATINGS*
PIN DESCRIPTIONS
VL to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to 6.50 V
VS to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to 6.50 V
–VS to AGND . . . . . . . . . . . . . . . . . . . . . . . . . –6.50 V to 0 V
Digital Inputs to DGND . . . . . . . . . . . . . . . . . . . –0.3 V to VL
AGND to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 0.3 V
Short Circuit . . . . . . . . . . . . . . . . . Indefinite Short to Ground
Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300°C, 10 sec
Storage Temperature . . . . . . . . . . . . . . . . . . –60°C to +100°C
*Stresses greater than those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in the
operational section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
ORDERING GUIDE
Model
Resolution
THD + N
Package
Option*
AD1851N
AD1851N-J
AD1851R
AD1851R-J
AD1861N
AD1861N-J
AD1861R
AD1861R-J
16 Bits
16 Bits
16 Bits
16 Bits
18 Bits
18 Bits
18 Bits
18 Bits
0.008%
0.004%
0.008%
0.004%
0.008%
0.004%
0.008%
0.004%
N-16
N-16
R-16
R-16
N-16
N-16
R-16
R-16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
–VS
DGND
VL
NC
CLK
LE
DATA
NC
VOUT
RF
SJ
AGND
IOUT
MSB ADJ
TRIM
VS
Analog Negative Power Supply
Logic Ground
Logic Positive Power Supply
No Connection
Clock Input
Latch Enable Input
Serial Data Input
No Internal Connection*
Voltage Output
Feedback Resistor
Summing Junction
Analog Ground
Current Output
MSB Adjustment Terminal
MSB Trimming Potentiometer Terminal
Analog Positive Power Supply
*Pin 8 has no internal connection; -V L from AD1856 or AD1860 socket can be
safely applied.
*N = Plastic DIP Package; R = Small Outline (SOIC) Package.
CAUTION
ESD (electrostatic discharge) sensitive device. The digital control inputs are diode protected;
however, permanent damage may occur on unconnected devices subject to high energy electrostatic fields. Unused devices must be stored in conductive foam or shunts. The protective foam
should be discharged to the destination socket before devices are inserted.
WARNING!
ESD SENSITIVE DEVICE
Typical Performance
10
175
150
1
–60dB
THD+N – %
PD – mW
125
100
75
0.1
0.01
50
–20dB
25
0dB
2
4
6
8
10
12
0.001
–30 –20 –10
14
CLOCK FREQUENCY – MHz
0
10
20
30
40
50
60
70
80
90
TEMPERATURE – °C
Power Dissipation vs. Clock Frequency
THD vs. Temperature
–4–
REV. A
AD1851/AD1861
TOTAL HARMONIC DISTORTION
RF
Total harmonic distortion plus noise (THD+N) is defined as
the ratio of the square root of the sum of the squares of the values of the first 19 harmonics and noise to the value of the fundamental input frequency. It is usually expressed in percent (%).
REFERENCE
AUDIO
OUTPUT
THD+N is a measure of the magnitude and distribution of linearity error, differential linearity error, quantization error and
noise. The distribution of these errors may be different, depending on the amplitude of the output signal. Therefore, to be most
useful, THD+N should be specified for both large (0 dB) and
small signal amplitudes (–20 dB and –60 dB).
INPUT LATCH
SERIAL-TO-PARALLEL
CONVERSION
CLOCK
The THD+N figure of an audio DAC represents the amount of
undesirable signal produced during reconstruction and playback
of an audio waveform. This specification, therefore, provides a
direct method to classify and choose an audio DAC for a
desired level of performance.
LE
DATA
Figure 1. AD1851/AD1861 Functional Block Diagram
FUNCTIONAL DESCRIPTION
The AD1851/AD1861 is a complete monolithic PCM audio
DAC. No additional external components are required for operation. As shown in Figure 1 above, each chip contains a voltage reference, an output amplifier, a DAC, an input latch and a
parallel input register.
SETTLING TIME
Settling time is the time required for the output of the DAC to
reach and remain within a specified error band about its final
value, measured from the digital input transition. It is a primary
measure of dynamic performance.
The voltage reference consists of a bandgap circuit and buffer
amplifier. This combination of elements produces a reference
voltage that is unaffected by changes in temperature and age.
The DAC output voltage, which is derived from the reference
voltage, is also unaffected by these environmental changes.
MIDSCALE ERROR
Midscale error, or bipolar zero error, is the deviation of the actual analog output from the ideal output (0 V) when the 2s
complement input code representing half scale is loaded in the
input register.
The output amplifier uses both MOS and bipolar devices to
produce low offset, high slew rate and optimum settling time.
When combined with the on-chip feedback resistor, the output
op amp converts the output current of the AD1851/AD1861 to
a voltage output.
D-RANGE DISTORTION
D-range distortion is equal to the value of the total harmonic
distortion + noise (THD+N) plus 60 dB when a signal level of
–60 dB below full scale is reproduced. D-range is tested with a
1 kHz input sine wave. This is measured with a standard Aweight filter as specified by EIAJ Standard CP-307.
The DAC uses a combination of segmented decoder and R-2R
architecture to achieve consistent linearity and differential linearity. The resistors which form the ladder structure are fabricated with silicon chromium thin film. Laser-trimming of these
resistors further reduces linearity error, resulting in low output
distortion.
SIGNAL-TO-NOISE RATIO
The signal-to-noise ratio (SNR) is defined as the ratio of the
amplitude of the output when a full-scale output is present to
the amplitude of the output with no signal present. This is measured with a standard A-weight filter as specified by EIAJ
Standard CP-307.
REV. A
IOUT DAC
The input register and serial-to-parallel converter are fabricated
with CMOS logic gates. These gates allow the achievement of
fast switching speeds and low power consumption. This contributes to the overall low power dissipation of the AD1851/
AD1861.
–5–
AD1851/AD1861
GROUNDING RECOMMENDATIONS
However, three separate voltage supplies are not necessary for
good circuit performance. For example, Figure 3 illustrates a
system where only a single positive and a single negative supply
are available.
The AD1851/AD1861 has two ground pins, designated Analog
and Digital ground. The analog ground pin is the “high quality”
ground reference point for the device. The analog ground pin
should be connected to the analog common point in the system.
The output load should also be connected to that same point.
In this example, the positive logic and positive analog supplies
must both be connected to +5 V, while the negative analog supply will be connected to –5 V. Performance would benefit from
a measure of isolation between the supplies introduced by using
simple low pass filters in the individual power supply leads.
Analog Circuit Considerations
The digital ground pin returns ground current from the digital
logic portions of the AD1851/AD1861 circuitry. This pin
should be connected to the digital common point in the system.
As illustrated in Figure 2, the analog and digital grounds should
be connected together at one point in the system.
+5V
+5V
3
+VL
16
+VS
AD1851/AD1861
+ 5V
+5V
3
16
+VL
+VS
DGND
–VS
AGND
2
1
12
ANALOG
GROUND
DIGITAL
GROUND
AD1851/AD1861
DGND
–VS
AGND
2
1
12
DIGITAL
GROUND
–5V
Figure 3. Alternate Recommended Schematic
ANALOG
GROUND
– 5V
Figure 2. Recommended Circuit Schematic
POWER SUPPLIES AND DECOUPLING
The AD1851/AD1861 has three power supply input pins. The
± VS supplies provide the supply voltages to operate the linear
portions of the DAC including the voltage reference, output amplifier and control amplifier. The ± VS supplies are designed to
operate at ± 5 V.
The +VL supply operates the digital portions of the chip including the input shift register and the input latching circuitry. The
+VL supply is designed to operate at +5 V.
As with most linear circuits, changes in the power supplies will
affect the output of the DAC. Analog Devices recommends that
well regulated power supplies with less than 1% ripple be incorporated into the design of any system using the AD1851/AD1861.
OPTIONAL MSB ADJUSTMENT
Use of an optional adjustment circuit allows residual differential
linearity error around midscale to be eliminated. This error is
especially important when low amplitude signals are being reproduced. In those cases, as the signal amplitude decreases, the
ratio of the midscale differential linearity error to the signal amplitude increases, thereby increasing THD.
Therefore, for best performance at low output levels, the optional MSB adjust circuitry shown in Figure 4 may be used to
improve performance. The adjustment should be made with a
small signal input (–20 dB or –60 dB).
Decoupling capacitors should be used on all power supply pins.
Furthermore, good engineering practice suggests that these capacitors be placed as close as possible to the package pins as
well as to the common points. The logic supply, +VL, should be
decoupled to digital common, while the analog supplies, ± VS,
should be decoupled to analog common.
TRIM
15
470kΩ
100kΩ
200kΩ
–VS
1
14
MSB
ADJUST
The use of three separate power supplies will reduce feedthrough
from the digital portion of the system to the linear portion of the
system, thus contributing to improved performance.
Figure 4. Optional THD Adjust Circuit
–6–
REV. A
AD1851/AD1861
AD1851 DIGITAL CIRCUIT CONSIDERATIONS
AD1851 Input Data
AD1861 DIGITAL CIRCUIT CONSIDERATIONS
AD1861 Input Data
Data is transmitted to the AD1851 in a bit stream composed of
16-bit words with a serial, MSB first format. Three signals
must be present to achieve proper operation. They are the
Data, Clock and Latch Enable (LE) signals. Input data bits are
clocked into the input register on the rising edge of the Clock
signal. The LSB is clocked in on the 16th clock pulse. When all
data bits are loaded, a low-going Latch Enable pulse updates
the DAC input. Figure 5 illustrates the general signal requirements for data transfer to the AD1851.
Data is transmitted to the AD1861 in a bit stream composed of
18-bit words with a serial, MSB first format. Three signals
must be present to achieve proper operation. They are the
Data, Clock and Latch Enable (LE) signals. Input data bits are
clocked into the input register on the rising edge of the Clock
signal. The LSB is clocked in on the 18th clock pulse. When all
data bits are loaded, a low-going Latch Enable pulse updates
the DAC input. Figure 7 illustrates the general signal requirements for data transfer to the AD1861.
CLOCK
CLOCK
AAAAAAAAA
DATA
AAAAAAAAA
L
S
B
M
S
B
DATA
M
S
B
L
S
B
LATCH
LATCH
Figure 5. Signal Requirements for AD1851
Figure 7. Signal Requirements for AD1861
Figure 6 illustrates the specific timing requirements that must
be met in order for the data transfer to be accomplished properly. The input pins of the AD1851 are both TTL and 5 V
CMOS compatible. The input requirements illustrated in Figures 5 and 6 are compatible with data outputs provided by
popular DSP filter chips used in digital audio playback systems.
The AD1851 input clock can run at a 12.5 MHz rate. This
clock rate will allow data transfer rates for 23, 43 or 83 or
163 oversampling reconstructions.
Figure 8 illustrates the specific timing requirements that must
be met in order for the data transfer to be accomplished properly. The input pins of the AD1861 are both TTL and 5 V
CMOS compatible. The input requirements illustrated in Figures 7 and 8 are compatible with data outputs provided by
popular DSP filter chips used in digital audio playback systems.
The AD1861 input clock can run at a 13.5 MHz rate. This
clock rate will allow data transfer rates for 23, 43 or 83 or
163 oversampling reconstructions.
>30ns
>30ns
DATA
DATA
>15ns
>15ns
>15ns
>40ns
CLOCK
CLOCK
>30ns
>30ns
>30ns
>15ns
>80.0ns
>30ns
>15ns
>74.1ns
LATCH
LATCH
>40ns
>40ns
>40ns
Figure 6. Timing Relationships of AD1851 Input Signals
REV. A
>15ns
>40ns
>40ns
Figure 8. Timing Relationships of AD1861 Input Signals
–7–
AD1851/AD1861
APPLICATIONS
Figures 9 through 12 show connection diagrams for the
AD1851 and AD1861 and the Yamaha YM3434 and the NPC
SM5813AP/APT digital filter chips.
CLK
+5V
CLK
LATCH
X1
ST
16/18 DLO
DATA
OUT
AD1851
LEFT
LOW OUTPUT
PASS
FILTER
BCO
YM3434
WCO
DRO
DATA
LATCH
CLK
OUT
AD1851
LOW
PASS
FILTER
RIGHT
OUTPUT
Figure 9. AD1851 with Yamaha YM3434 Digital Filter
CLK
+5V
CLK
LATCH
X1
ST
16/18
DLO
DATA
OUT
AD1861
LEFT
OUTPUT
LOW
PASS
FILTER
BCO
YM3434
WCO
DRO
DATA
LATCH
CLK
OUT
AD1861
LOW
PASS
FILTER
RIGHT
OUTPUT
Figure 10. AD1861 with Yamaha YM3434 Digital Filter
–8–
REV. A
AD1851/AD1861
+5V
CLK
LEFT
OUTPUT
CLK
LATCH
X1
COB
OW20
DOL
DATA
OUT
LOW
PASS
FILTER
OUT
LOW
PASS
FILTER
AD1851
BCKO
SM5813AP/APT
WCKO
DOR
DATA
OW18
LATCH
CLK
+5V
AD1851
RIGHT
OUTPUT
Figure 11. AD1851 with NPC SM5813AP/APT Digital Filter
+5V
CLK
LEFT
OUTPUT
CLK
LATCH
X1
COB
OW20
DOL
DATA
OUT
LOW
PASS
FILTER
OUT
LOW
PASS
FILTER
AD1861
BCKO
SM5813AP/APT
WCKO
OW18
DOR
DATA
LATCH
CLK
AD1861
Figure 12. AD1861 with NPC SM5813AP/APT Digital Filter
REV. A
–9–
RIGHT
OUTPUT
AD1851/AD1861
OTHER DIGITAL AUDIO COMPONENTS AVAILABLE
FROM ANALOG DEVICES
–VS
1
DGND
2
+VL
3
NC
4
CLK
5
LE
6
DATA
7
–VL
8
16-BIT
LATCH
16-BIT
DAC
16 +VS
15 TRIM
SERIAL
INPUT
REGISTER
AD1856
DGND
2
3
NC
4
CLK
5
11 SJ
LE
6
10 RF
DATA
7
–VL
8
13 IOUT
12 AGND
CONTROL
LOGIC
1
+VL
14 MSB ADJ
IOUT
–VS
9
VOUT
18-BIT
LATCH
18-BIT
DAC
16 +VS
15 TRIM
SERIAL
INPUT
REGISTER
14 MSB ADJ
13 IOUT
IOUT
12 AGND
CONTROL
LOGIC
11 SJ
10 RF
AD1860
NC = NO CONNECT
9
VOUT
NC = NO CONNECT
AD1856 16-BIT AUDIO DAC
AD1860 18-BIT AUDIO DAC
Complete, No External Components Required
0.0025% THD
Low Cost
16-Pin DIP or SOIC Package
Standard Pinout
Complete, No External Components Required
0.0025% THD+N
108 dB Signal-to-Noise Ratio
16-Pin DIP or SOIC Package
Standard Pinout
–VS
16
1
–VS
2
TRIM
3
VOLTAGE
REFERENCE
15
14
ADJ
4
13
NR1
CLK
5
12
AGND
11
IOUT
LE 6
DATA
7
–VL
8
INPUT
AND
DIGITAL
OFFSET
20-BIT
DAC
AD1862
24
+VS
23
TRIM
3
22
MSB
IOUT
4
21
IOUT
AGND
5
20
AGND
SJ
6
19
SJ
RF
7
18
RF
VOUT
8
+VL
9
DR
10
TRIM
2
MSB
NR2
+VL
10
RF
9
DGND
AD1864
–VS 1
+VS
LR 11
CK
REFERENCE
REFERENCE
–
+
18-BIT
LATCH
–
+
18-BIT
D/A
18-BIT
D/A
18-BIT
LATCH
12
17
VOUT
16
–VL
15
DL
14
LL
13
DGND
NC = NO CONNECT
AD1862 20-BIT AUDIO DAC
AD1864 DUAL 18-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
Complete, No External Components
0.0025% THD+N
108 dB Signal-to-Noise Ratio
Cophased Outputs
24-Pin Package
–10–
REV. A
AD1851/AD1861
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
N (Plastic DIP) Package
R (SOIC Surface Mount) Package
16
9
0.299
(7.60)
0.419
(10.65)
1
PIN
1
8
0.030
(0.75)
0.050 (1.27)
0.413 (10.50)
0.104
(2.650)
0.019
(0.49)
REV. A
0.012
(0.30)
–11–
0.013
(0.32)
0.042
(1.07)
–12–
PRINTED IN U.S.A.
C1458–7–10/90
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