AD766 Analog Devices, AD766 Datasheet

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AD766

Manufacturer Part Number
AD766
Description
16-Bit Current-Steering DAC with Voltage Reference
Manufacturer
Analog Devices
Datasheet

Specifications of AD766

Resolution (bits)
16bit
Dac Update Rate
390kSPS
Dac Settling Time
1.5µs
Max Pos Supply (v)
+13.2V
Single-supply
No
Dac Type
Voltage Out
Dac Input Format
Ser

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a
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.
PRODUCT DESCRIPTION
The AD766 16-bit DSP DACPORT provides a direct, three-
wire interface to the serial ports of popular DSP processors, in-
cluding the ADSP-2101, TMS320CXX, and DSP56001. No
additional “glue logic” is required. The AD766 is also com-
plete, offering on-chip serial-to-parallel input format conver-
sion, a 16-bit current-steering DAC, voltage reference, and a
voltage output op amp. The AD766 is fabricated in Analog
Devices’ BiMOS II mixed-signal process which provides bipolar
transistors, MOS transistors, and thin-film resistors for preci-
sion analog circuits in addition to CMOS devices for logic.
The design and layout of the AD766 have been optimized for ac
performance and are responsible for its guaranteed and tested
94 dB signal-to-noise ratio to 20 kHz and 79 dB SNR to
250 kHz. Laser-trimming the AD766’s silicon chromium thin-
film resistors reduces total harmonic distortion below –81 dB
(at 1 kHz), a specification also production tested. An optional
linearity trim pin allows elimination of midscale differential
linearity error for even lower THD with small signals.
The AD766’s output amplifier provides a 3 V signal with a
high slew rate, small glitch, and fast settling. The output ampli-
fier is short circuit protected and can withstand indefinite shorts
to ground.
DACPORT is a registered trademark of Analog Devices, Inc.
FEATURES
Zero-Chip Interface to Digital Signal Processors
Complete DACPORT®
Serial, Twos-Complement Input
Sample Rates to 390 kSPS
94 dB Minimum Signal-to-Noise Ratio
–81 dB Maximum Total Harmonic Distortion
15-Bit Monotonicity
16-Pin Plastic and Ceramic Packages
Available in Commercial, Industrial, and Military
APPLICATIONS
Digital Signal Processing
Noise Cancellation
Radar Jamming
Automatic Test Equipment
Precision Industrial Equipment
Waveform Generation
3 V Output
5 V to
On-Chip Voltage Reference
Voltage and Current Outputs
Temperature Ranges
12 V Operation
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
The serial interface consists of bit clock, data, and latch enable
inputs. The twos-complement data word is clocked MSB first
on falling clock edges into the serial-to-parallel converter, con-
sistent with the serial protocols of popular DSP processors. The
input clock can support data transfers up to 12.5 MHz. The
falling edge of latch enable updates the internal DAC input reg-
ister at the sample rate with the sixteen bits most recently
clocked into the serial input register.
The AD766 operates over a 5 V to 12 V power supply range.
The digital supplies, +V
analog signal supplies, +V
crosstalk. Separate analog and digital ground pins are also pro-
vided. An internal bandgap reference provides a precision volt-
age source to the output amp that is stable over temperature and
time.
Power dissipation is typically 120 mW with 5 V supplies and
300 mW with 12 V. The AD766 is available in commercial
(0 C to +70 C), industrial (–40 C to +85 C), and military
(–55 C to +125 C) grades. Commercial and industrial grade
parts are available in a 16-pin plastic DIP; military parts pro-
cessed to MIL-STD-883B are packaged in a 16-pin ceramic
DIP. See Analog Devices’ Military Products Databook or current
military data sheet for specifications for the military version.
FUNCTIONAL BLOCK DIAGRAM
L
and –V
S
and –V
L
, can be separated from the
S
, for reduced digital
DSP DACPORT
AD766
Fax: 617/326-8703
16-Bit

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AD766 Summary of contents

Page 1

... DAC input reg- ister at the sample rate with the sixteen bits most recently clocked into the serial input register. The AD766 operates over power supply range. The digital supplies, +V and –V ...

Page 2

... Indefinite to Common 0.7 1.0 1.3 1.7 4.75 13.2 –13.2 –4.75 +I 12.0 15.0 –I –12.0 –15.0 +I 10.5 –I – –I –14 120 150 300 225 –2– = 500 kSPS unless otherwise noted. No deglitchers or AD766A Min Typ Max 16 2 0.8 1.0 –10 115 100 2 0.001 15 –88 –81 –75 – ...

Page 3

... Analog Positive Power Supply S ESD SENSITIVITY The AD766 features input protection circuitry consisting of large “distributed” diodes and polysilicon series resistors to dissipate both high energy discharges (Human Body Model) and fast, low energy pulses (Charged Device Model). Per Method 3015.2 of MIL-STD-883C, the AD766 has been classified as a Category 1 Device ...

Page 4

... The AD766 specifies SNR for 20 kHz and 250 kHz bandwidths. FUNCTIONAL DESCRIPTION Serial input data is clocked into the AD766’s shift register by the falling edge of CLK. Data is presumed twos complement format with MSB (i.e., the sign bit) clocked in first. ...

Page 5

... assure freedom from latch-up, –V more negative than –V Special restrictions on power supplies apply to extended tem- perature range versions of the AD766 that do not apply to the commercial AD766J. First, supplies must be symmetric. That is –V and +V = – ...

Page 6

... AD766 result in excellent THD performance. Figure 9 shows the typical unadjusted THD per- formance of the AD766 for various amplitudes of 1 kHz and 50 kHz sine waves. As can be seen, the AD766 offers excellent performance even at amplitudes as low as 60 dB. Figure 10 illustrates the typical THD versus frequency performance from the internal amplifier for a filtered AD766 output ...

Page 7

... AD766 TO ADSP-2101 The ADSP-2101 incorporates two complete serial ports which can be directly interfaced to the AD766 as shown in Figure 12. The SCLK, TFS and DT outputs of the ADSP-2101 are con- nected directly to the CLK, LE and DATA inputs of the AD766, respectively. SCLK is internally generated and can be programmed to operate from ...

Page 8

... AD766 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 16-Pin Plastic DIP (N-16) D-16 16-Lead Side Brazed Ceramic DIP –8– REV. A ...

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