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a
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 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
VL 1 LL 2
Single Supply Dual 18-Bit Audio DAC AD1868*
FUNCTIONAL BLOCK DIAGRAM
18-BIT DAC
AD1868
16 VBL - + 14 VOL VREF 15 VS
18-BIT SERIAL REGISTER
DL
3
CK
4
13
NRL
DR
5
LR
6
18-BIT SERIAL REGISTER
12 AGND VREF +
11 NRR
DGND
7
18-BIT DAC
-
10 VOR VS
PRODUCT DESCRIPTION
VBR
8
9
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 process. The monolithic chip includes CMOS logic elements, bipolar and MOS linear elements, and laser-trimmed thin-film resistor elements. Careful design and layout techniques have resulted 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 amplifier. 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 voltages 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 2x, 4x, 8x, or 16x 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; 4,857,862; and patents pending.
The AD1868 operates on +5 V power supplies. The digital supply, VL, can be separated from the analog supply, VS, for reduced digital feedthrough. Separate analog and digital ground pins are also provided. In systems employing a single +5 volt power supply, VL and VS should be connected together. In battery 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 16pin plastic SOIC package. Operation is guaranteed over the temperature range of -35C to +85C and over the voltage supply range of 4.75 V to 5.25 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.
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
AD1868-SPECIFICATIONS (typical at T = +25 C and +5 V supplies unless otherwise noted)
A
Min RESOLUTION VIH VIL IIH, VIH = VL IIL, VIL = DGND Maximum Clock Input Frequency ACCURACY Gain Error Gain Matching Midscale Error Midscale Error Matching Gain Linearity Error DRIFT (0C to +70C) Gain Drift Midscale Drift TOTAL HARMONIC DISTORTION + NOISE 0 dB, 990.5 Hz AD1868N AD1868N-J -20 dB, 990.5 Hz AD1868N AD1868N-J -60 dB, 990.5 Hz AD1868N AD1868N-J CHANNEL SEPARATION 1 kHz, 0 dB SIGNAL-TO-NOISE RATIO (with A-Weight Filter) D-RANGE (with A-Weight Filter) OUTPUT Voltage Output Pins (VOL, VOR) Output Range ( 3%) Output Impedance Load Current Bias Voltage Pins (VBL, VBR) Output Voltage Output Impedance POWER SUPPLY Specification, VL and VS Operation, VL and VS +I, VL and VS = 5 V POWER DISSIPATION TEMPERATURE RANGE Specification Operation Storage
*Above 115 dB. Specifications subject to change without notice.
Typ 18
Max
Units Bit V V A A MHz % of FSR % of FSR mV mV dB ppm/C V/C
DIGITAL INPUTS
2.4 0.8 1.0 1.0 13.5 1 1 15 10 3 100 100 0.004 0.004 0.020 0.020 2.0 2.0 NIL* 97.5 92 1 0.1 1 +2.5 350 4.75 3.5 5 10 50 0 -35 -60 25 5.25 5.25 14 70 70 85 100 0.008 0.006 0.08 0.08 5.0 5.0
108 95 86
% % % % % % dB dB dB
V mA V V V mA mW C C C
ABSOLUTE MAXIMUM RATINGS*
VL to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to 6 V VS to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to 6 V AGND to DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V Digital Inputs to DGND . . . . . . . . . . . . . . . . . . . . . -0.3 to VL Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300C, 10 sec
*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.
CAUTION 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 AD1868 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.
WARNING!
ESD SENSITIVE DEVICE
-2-
REV. A
AD1868 Typical Performance of the AD1868
-30 -60dB
CHANNEL SEPARATION - dB
150
-40 -50
THD +N - dB
140
-60 -70 -80 -90 0dB -20dB
130
120
110
-100 0.5
100
2.5
4.5
6.5
8.5
10.5
12.5 14.5
16.5
18.5
20.5
103
FREQUENCY - kHz
104 FREQUENCY - Hz
Figure 1. THD+N vs. Frequency
-20 -60dB
GAIN LINEARITY ERROR - dB
Figure 2. Channel Separation vs. Frequency
8
-30 -40
6 0C 4 2 25C 0
THD +N - dB
-50
-60 -20dB -70 -80 0dB -90 4.4 4.6 4.8 5.0 VOLTAGE SUPPLY 5.2 5.4
-2 70C -4 -6 -100
-80
-60
-40
-20
-10
0
INPUT AMPLITUDE - dB
Figure 3. THD+N vs. Supply Voltage
-20
Figure 4. Gain Linearity Error vs. Input Amplitude
90
- 60dB -40
THD +N - dB
80
PSRR - dB
70
-60
60
- 20dB -80
50
0dB -100 -50
40 102
-30
-10
10
30
50
70
90
110
130
140
103
104
105
TEMPERATURE - C
SUPPLY MODULATION FREQUENCY - Hz
Figure 5. THD+N vs. Temperature
Figure 6. Power Supply Rejection Ratio vs. Frequency
REV. A
-3-
AD1868
PIN CONFIGURATION PIN DESIGNATIONS
VL LL DL CK DR LR DGND VBR 16 VBL 15 VS 14 VOL
1 2 3
AD1868
4 5 6 7 8 TOP VIEW (Not To Scale) 13 NRL 12 AGND 11 NRR 10 VOR 9 VS
DEFINITION OF SPECIFICATIONS
Total Harmonic Distortion + Noise Total harmonic distortion plus noise (THD+N) is defined as the ratio of the square root of the sum of the squares of the amplitudes of the harmonics and noise to the amplitude of the fundamental input frequency. It is usually expressed in percent (%) or decibels (dB).
D-Range Distortion
11 12 13 14 15 16 17 18 19 10 11 12 13 14 15 16
VL LL DL CK DR LR DGND VBR VS VOR NRR AGND NRL VOL VS VBL
Digital Supply (+5 Volts) Left Channel Latch Enable Left Channel Data Input Clock Input Right Channel Data Input Right Channel Latch Enable Digital Common Right Channel Bias Analog Supply (+5 Volts) Right Channel Output Right Channel Noise Reduction Analog Common Left Channel Noise Reduction Left Channel Output Analog Supply (+5 Volts) Left Channel Bias
FUNCTIONAL DESCRIPTION
D-range distortion is the ratio of the amplitude of the signal at an amplitude of -60 dB to the amplitude of the distortion plus noise. In this case, an A-weight filter is used. The value specified for D-range performance is the ratio measured plus 60 dB. Signal-to-Noise Ratio The signal-to-noise ratio 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. It is expressed in decibels (dB) and measured using an A-weight filter. Gain Linearity Gain linearity is a measure of the deviation of the actual output amplitude from the ideal output amplitude. It is determined by measuring the amplitude of the output signal as the amplitude of that output signal is digitally reduced to a lower level. A perfect D/A converter exhibits no difference between the ideal and actual amplitudes. Gain linearity is expressed in decibels (dB). Midscale Error 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 expressed in mV.
ORDERING GUIDE
The AD1868 is a complete, voltage output dual 18-bit digital audio DAC which operates with a single +5 volt supply. As shown in the block diagram, each channel contains a voltage reference, an 18-bit DAC, an output amplifier, an 18-bit input latch, and an 18-bit serial-to-parallel input register. The voltage reference section provides a reference voltage and a false ground voltage for each channel. The low noise bandgap circuits produce reference voltages that are unaffected by changes in temperature, time, and power supply. The output amplifier uses both MOS and bipolar devices and incorporates an NPN class-A output stage. It is designed to produce high slew rate, low noise, low distortion, and optimal frequency response. Each 18-bit DAC uses a combination of segmented decoder and R-2R architecture to achieve good integral 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. The input registers are fabricated with CMOS logic gates. These gates allow fast switching speeds and low power consumption, contributing to the fast digital timing, low glitch, and low power dissipation of the AD1868.
Model AD1868N AD1868R AD1868N-J AD1868R-J
THD + N @ FS 0.008% 0.008% 0.006% 0.006%
SNR 95 dB 95 dB 95 dB 95 dB
Package Option* N-16 R-16 N-16 R-16
*N = Plastic DIP; R = SOIC.
-4-
REV. A
AD1868
VL 1 18-BIT DAC
AD1868
16 VBL - + 14 VOL VREF 15 VS
LL
2
18-BIT SERIAL REGISTER
DAC, the AD1868 can continue to function at supply voltages as low as 3.5 V. Because of its unique design, the power requirements of the AD1868 diminish as the battery voltage drops, further extending the operating time of the system.
POWER SUPPLY
DL
3
CK
4
13
NRL
1 VL LL DL CK
AD1868
VBL 16 VS 15 VOL 14 4.7F NRL 13 AGND 12 NRR 11 VOR 10 VS 9 4.7F 0.1F 2 3
DR
5
LR
6
18-BIT SERIAL REGISTER
12 AGND VREF +
11 NRR
0.1F
4
5 DR
DGND
7
18-BIT DAC
-
10 VOR VS
6 7 8
LR DGND VBR
VBR
8
9
Functional Block Diagram
ANALOG CIRCUIT CONSIDERATIONS GROUNDING RECOMMENDATIONS
Figure 7. Recommended Circuit Schematic
NOISE REDUCTION CAPACITORS
The AD1868 has two ground pins, designated as AGND (Pin 12) and DGND (Pin 7). The analog ground, AGND, serves as the "high quality" reference ground for analog signals and as a return path for the supply current from the analog portion of the device. The system analog common should be located as close as possible to Pin 12 to minimize any voltage drop which may develop between these two points, although the internal circuit is designed to minimize signal dependence of the analog return current. The digital ground, DGND, returns ground current from the digital logic portion of the device. This pin should be connected to the digital common node in the system. As shown in Figure 7, the analog and digital grounds should be joined at one point in the system. When these two grounds are remotely connected such as at the power supply ground, care should be taken to minimize the voltage difference between the DGND and AGND pins in order to ensure the specified performance.
POWER SUPPLIES AND DECOUPLING
The AD1868 has two noise reduction pins designated as NRL (Pin 13) and NRR (Pin 11). It is recommended that external noise reduction capacitors be connected from these pins to AGND to reduce the output noise contributed by the voltage reference circuitry. As shown in Figure 7, each of these pins should be bypassed to AGND with a 4.7 F or larger capacitor. The connections between the capacitors, package pins and AGND should be as short as possible to achieve the lowest noise.
USING VBL AND VBR
The AD1868 has two bias voltage reference pins, designated as VBR (Pin 8) and VBL (Pin 16). These pins supply a dc reference voltage equal to the center of the output voltage swing. These bias voltages replace "False Ground" networks previously required in single-supply audio systems. At the same time, they allow dccoupled systems, improving audio performance. Figure 8a illustrates the traditional approach used to generate False Ground voltages in single-supply audio systems. This circuit requires additional power and circuit board space.
-VS 1 16-BIT LATCH 16-BIT DAC 16 +VS
The AD1868 has three power supply input pins. VS (Pins 9 and 15) provides the supply voltages which operate the analog portion of the device including the 18-bit DACs, the voltage references, and the output amplifiers. The VS supplies are designed to operate with a +5 V supply. These pins should be decoupled to analog common using a 0.1 F capacitor. Good engineering practice suggests that the bypass capacitors be placed as close as possible to the package pins. This minimizes the inherent inductive effects of printed circuit board traces. VL (Pin 1) operates the digital portions of the chip including the input shift registers and the input latching circuitry. VL is also designed to operate with a +5 V supply. This pin should be bypassed to digital common using a 0.1 F capacitor, again placed as close as possible to the package pin. Figure 7 illustrates the correct connection of the digital and analog supply bypass capacitors. An important feature of the AD1868 audio DAC is its ability to operate at reduced power supply voltages. This feature is very important in portable battery operated systems. As the batteries discharge, the supply voltage drops. Unlike any other audio REV. A
DGND
2
15
TRIM
+VL
3
SERIAL INPUT REGISTER IOUT
14
MSB ADJ
NC
4
13
IOUT
CLK
5 CONTROL LOGIC
12
AGND
LE
6
11
SJ
DATA
7
10
RF
NC
8
9
VOUT
AD1851
NC = NO CONNECT
Figure 8a. Schematic Using False Ground
-5-
AD1868
+ 5V
AD1868
1 2 VL LL VBL 16 VS 15 VOL 14 NRL 13 AGND 12 NRR 11 VOR 10 VS 9 + 5V
VOL
Figure 1 illustrates the typical THD+N versus frequency performance of the AD1868. It is evident that the THD+N performance of the AD1868 remains stable at all three levels through a wide range of frequencies. A load impedance of at least 2 k is recommended for best THD+N performance. Analog Devices tests and grades all AD1868s on the basis of THD+N performance. During the distortion test, a high speed digital pattern generator transmits digital data to each channel of the device under test. Eighteen-bit data is latched into the DAC at 352.8 kHz (8x FS). The test waveform is a 990.5 Hz sine wave with 0 dB, -20 dB, and -60 dB amplitudes. A 4096point FFT calculates total harmonic distortion + noise, signal-to-noise ratio, and D-range. No deglitchers or external adjustments are used.
3 DL 4 CK 5 DR 6 LR 7 DGND 8 VBR
VOR
Figure 8b. Circuitry Using Voltage Biases
DIGITAL CIRCUIT CONSIDERATIONS
INPUT DATA
The AD1868 eliminates the need for "False Ground" circuitry. VBR and VBL generate the required bias voltages previously generated by the "False Ground." As shown in Figure 8b, VBR and VBL may be used as the reference point in each output channel. This permits a dc-coupled output signal path. This eliminates ac-coupling capacitors and improves low frequency performance. It should be noted that these bias outputs have relatively high output impedance and will not drive output currents larger than 100 A without degrading the specified performance.
DISTORTION PERFORMANCE AND TESTING
The THD+N figure of an audio DAC represents the amount of undesirable signal produced during reconstruction and playback of an audio waveform. Therefore, the THD+N specification provides a direct method to classify and choose an audio DAC for a desired level of performance.
CLK
The AD1868 digital input port employs five signals: Data Left (DL), Data Right (DR), Latch Left (LL), Latch Right (LR) and Clock (CLK). DL and DR are the serial inputs for the left and right DACs, respectively. Input data bits are clocked into the input register on the rising edge of CLK. The falling edges of LL and LR cause the last 18 bits which were clocked into the serial registers to be shifted into the DACs, thereby updating the respective DAC outputs. 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. Data is transmitted to the AD1868 in a bit stream composed of 18-bit words with a serial, twos complement, MSB first format. Left and right channels share the Clock (CLK) signal. Figure 9 illustrates the general signal requirements for data transfer for the AD1868.
DL
MSB
LSB
DR
MSB
LSB
LL
LR
Figure 9. Control Signals
-6-
REV. A
AD1868
TIMING
Figure 10 illustrates the specific timing requirements that must be met in order for the data transfer to be accomplished properly. The input pins of the AD1868 are TTL and 5 V CMOS compatible. The maximum clock rate of the AD1868 is specified to be at least 13.5 MHz. This clock rate allows data transfer rates of 2x, 4x, 8x, and 16x FS (where FS equals 44.1 kHz). The applications section of this data sheet contains additional guidelines for using the AD1868.
> 74./ ns >30ns CLK >60ns >40ns LATCH ENABLE (LE) >30ns >10ns >10ns DATA MSB 1st BIT INTERNAL DAC INPUT REGISTER UPDATED WITH 18 MOST RECENT BITS 2nd BIT LSB (18th BIT) NEXT WORD BITS CLOCKED TO SHIFT REGISTER >15ns >40ns >30ns
AD1868 drops. This extends the usable battery life. Finally, as the battery supply voltage drops, the bias voltages and signal swings also drop, preventing signal clipping and abrupt degradation of distortion. Figure 3 illustrates that THD+N performance of the AD1868 remains constant through a wide range of supply voltages. Automotive equipment rely on components which are able to consistently perform in a wide range of temperatures. In addition, due to the limited space available in automotive applications, small size is essential. The AD1868 is able to satisfy both of these requirements. The device has guaranteed specified performance between 0C and +70C, and the 16-pin DIP or 16pin SOIC package is particularly attractive where overall size is important. Since the AD1868 provides dc bias voltages, the entire signal chain can be dc-coupled. This eliminate ac-coupling capacitors from the signal path, improving low frequency performance and lowering system cost and size. In summary, the AD1868 is an excellent choice for battery operated portable or automotive digital audio systems. In the following sections, some examples of high performance audio applications featuring the AD1868 are described.
AD1868 with Sony CXD2550P Digital Filter
Figure 10. Input Signal Timing
APPLICATIONS OF THE AD1868
The AD1868 is a high performance audio DAC specifically designed for portable and automotive digital audio applications. These market segments have technical requirements fundamentally different than those found in the high-end or home-use market segments. Portable equipment must rely on components which require low amounts of power to offer reasonable playing times. Also, battery voltages drop as the end of the discharge cycle is approached. The AD1868's ability to operate from a single +5 V supply makes it a good choice for battery-operated gear. As the battery voltage drops, the power dissipation of the
Figure 11 illustrates an 18-bit CD player design incorporating an AD1868 DAC, a Sony CXD2550P digital filter and 2-pole antialias filters. This high performance, single supply design operates at 8x FS and is suitable for portable and automotive applications. In this design, the CXD2550P filter transmits left and right channel digital data to the AD1868. The left and right latch signals, LL and LR, are both provided by the word clock signal (LRCKO) of the digital filter. The digital data is converted to low distortion output voltages by the output amplifiers on the AD1868. Also, no deglitching circuitry or external adjustments are required. Bypass capacitors, noise reduction capacitors and the antialias filter details are omitted for clarity.
+5V POWER SUPPLY
CXD2550P
1 2 3 4 5 6 7 8 9 INIT VDD TEST 8Fs/4Fs SLOT 18 LRCK0 17 DATAL 16 DATAR 15 VSS 14 BCKO 13 12 11 10 1 2 3 4 5 6 7 8 VL LL DL CK DR LR
AD1868
VBL 16 VS 15 VOL 14 NRL 13 AGND 12 NRR 11 VOR 10 VS 9 1 2 3 4 AGND VS 8 7 6 5
LEFT CHANNEL OUTPUT RIGHT CHANNEL OUTPUT
DGND VBR
Figure 11. AD1868 with Sony CXD2550P Digital Filter
REV. A
-7-
AD1868
ADDITIONAL APPLICATIONS
In addition to CD player designs, the AD1868 is suitable for similar applications such as DAT, portable musical instruments, Laptop and Notebook personal computers, and PC audio I/O boards. The circuit techniques illustrated are directly applicable in those applications.
+5V POWER SUPPLY
Figures 12, 13, and 14 show connection diagrams for the AD1868 with popular digital filter chips from NPC and Yamaha. Each application operates at 8x FS operation. Please refer to the appropriate sections of this data sheet for additional information.
SM5813
1 2 3 4 5 6 7 8 9 10 11 12 13 14 VSS1 28 27 BCKO 26 WCKO 25 DOL 24 DOR 23 VDD 22 VSS2 21 20 19 18 OW18 17 OW20 16 COB 15 1 2 3 4 5 6 7 8 VL LL DL CK DR LR
AD1868
VBL 16 VS 15 VOL 14 NRL 13 AGND 12 NRR 11 VOR 10 VS 9 LOW PASS FILTER RIGHT CHANNEL OUTPUT LOW PASS FILTER LEFT CHANNEL OUTPUT
DGND VBR
Figure 12. AD1868 with NPC SM5813 Digital Filter
+5V POWER SUPPLY
SM5818AP
1 2 3 4 5 6 7 8 VSS VDD 16 BCKO 15 WDCO 14 13 DOR 12 DOL 11 10 9 1 2 3 4 5 6 7 8 VL LL DL CK DR LR
AD1868
VBL 16 VS 15 VOL 14 NRL 13 AGND 12 NRR 11 VOR 10 VS 9 LOW PASS FILTER RIGHT CHANNEL OUTPUT LOW PASS FILTER LEFT CHANNEL OUTPUT
DGND VBR
Figure 13. AD1868 with NPC SM5818AP Digital Filter
-8-
REV. A
AD1868
+5V POWER SUPPLY
YM3434
1 2 3 4 5 6 7 8 VDD1 16/18 ST VDD2 VSS BCO WCO DRO DLO 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 VL LL DL CK DR LR DGND VBR
AD1868
VBL VS VOL NRL AGND NRR VOR VS 16 15 14 13 12 11 10 9 LOW PASS FILTER RIGHT CHANNEL OUTPUT LOW PASS FILTER LEFT CHANNEL OUTPUT
Figure 14. AD1868 with Yamaha YM3434 Digital Filter
OTHER DIGITAL AUDIO COMPONENTS AVAILABLE FROM ANALOG DEVICES
-VS
1
16-BIT LATCH
16-BIT DAC
16
+VS
-VS
1
18-BIT LATCH
18-BIT DAC
16
+VS
DGND
2
15
TRIM
DGND
2
15
TRIM
+VL
3
SERIAL INPUT REGISTER IOUT
14
MSB ADJ
+VL
3
SERIAL INPUT REGISTER IOUT
14
MSB ADJ
NC
4
13
IOUT
NC
4
13
IOUT
CLK
5 CONTROL LOGIC
12
AGND
CLK
5 CONTROL LOGIC
12
AGND
LE
6
11
SJ
LE
6
11
SJ
DATA
7
10
RF
DATA
7
10
RF
-VL
8
9
VOUT
-VL
8
9
VOUT
AD1856
NC = NO CONNECT
AD1860
NC = NO CONNECT
AD1856 16-Bit Audio DAC
AD1860 18-Bit Audio DAC
Complete, No External Components Required 16-Pin DIP or SOIC Package Standard Pinout Low Cost
Complete, No External Components Required 102 dB SNR Minimum 16-Pin DIP or SOIC Package Standard Pinout
REV. A
-9-
AD1868
-VS 1 16-BIT LATCH 16-BIT DAC 16 +VS
-VS
1
18-BIT LATCH
18-BIT DAC
16
+VS
DGND
2
15
TRIM
DGND
2
15
TRIM
+VL
3
SERIAL INPUT REGISTER IOUT
14
MSB ADJ
+VL
3
SERIAL INPUT REGISTER IOUT
14
MSB ADJ
NC
4
13
IOUT
NC
4
13
IOUT
CLK
5 CONTROL LOGIC
12
AGND
CLK
5 CONTROL LOGIC
12
AGND
LE
6
11
SJ
LE
6
11
SJ
DATA
7
10
RF
DATA
7
10
RF
NC
8
9
VOUT
NC
8
9
VOUT
AD1851
NC = NO CONNECT
AD1861
NC = NO CONNECT
AD1851 16-Bit PCM Audio DAC
AD1861 18-Bit PCM Audio DAC
107 dB SNR Minimum 16 x FS Capability 5 V Supply
107 dB SNR Minimum 16 x FS Capability 5 V Supply
-VS TRIM MSB IOUT AGND SJ RF VOUT +VL DR LR CK
1 2 3 4 5 6 7 8 9 10 11 12
AD1864
24 23
+VS TRIM MSB IOUT AGND SJ RF VOUT -VL DL
-VS TRIM MSB IOUT AGND SJ RF VOUT +VL DR LR
1 2 3 4 5 6 7 8 9 10 11 12
AD1865
24 23
+VS TRIM MSB IOUT AGND SJ RF VOUT NC DL LL DGND
REFERENCE
REFERENCE
22 21 20 19 18
REFERENCE
REFERENCE
22 21 20 19 18
- +
- +
17 16 15
- +
- +
17 16 15
18-BIT LATCH
18-BIT DAC
18-BIT DAC
18-BIT LATCH 14 13
18-BIT LATCH
18-BIT DAC
18-BIT DAC
18-BIT LATCH 14 13
LL
CK
DGND
NC = NO CONNECT
AD1864 Dual 18-Bit Audio DAC
AD1865 Dual 18-Bit Audio DAC
Complete, No External Components High Performance Low Crosstalk 24-Pin DIP THD+N = 0.004% (typical)
107 dB SNR Minimum 16 x FS Capability THD+N = 0.004% (typical) 5 V Supply
-10-
REV. A
AD1868
-VS 1 VOLTAGE REFERENCE 16 +VS
-VS
2
15
NR2
TRIM
3
14
ADJ
+VL
4
13
NR1
CLK
5 INPUT & DIGITAL OFFSET 20-BIT DAC
12
AGND
LE
6
11
IOUT
DATA
7
10
RF
-VL
8
9
DGND
AD1862
AD1862 20-Bit, Low Noise Audio DAC
110 dB SNR Minimum THD+N = 0.0019% (typical) 1 dB Gain Linearity 16-Pin Plastic DIP
REV. A
-11-
AD1868
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
Plastic DIP (N) Package
16 9
0.31 0.25 (6.35) (7.87)
1 8
0.87 (22.1) MAX 0.035 (0.89) 0.18 (4.57) 0.125 (3.18) MIN 0.033 (0.84) 0.1 (2.54) 0.18 (4.57) MAX 0.011 (0.28) 0.3 (7.62) 0.018 (0.46)
Plastic SOIC (R) Package
16
9
0.299 (7.60)
0.419 (10.65)
1
8
0.413 (10.50) 0.012 (0.3) 0.104 (2.65) 0.050 (1.27) REF 0.030 (0.75)
0.019 (0.49)
0.013 (0.32)
0.042 (1.07)
-12-
REV. A
PRINTED IN U.S.A.
C1478-7-10/90

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