AD7111A Analog Devices, AD7111A Datasheet

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AD7111A

Manufacturer Part Number
AD7111A
Description
LC2MOS LOGDAC Logarithmic D/A Converter
Manufacturer
Analog Devices
Datasheet

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a
GENERAL DESCRIPTION
The LOGDAC AD7111/AD7111A are monolithic multiplying
D/A converters featuring wide dynamic range in a small pack-
age. Both DACs can attenuate an analog input signal over the
range 0 dB to 88.5 dB in 0.375 dB steps. They are available in
16-pin DIPs and SOIC packages. The AD7111 is also available
in a 20-terminal LCCC package.
The degree of attenuation across the DAC is determined by an
8-bit word applied to the onboard decode logic. This 8-bit word
is decoded into a 17-bit word which is then applied to a 17-bit
R-2R ladder. The very fine step resolution, which is available
over the entire dynamic range, is due to the use of this 17-bit
DAC.
The AD7111/AD7111A are easily interfaced to a standard 8-bit
MPU bus via an 8-bit data port and standard microprocessor
control lines. The AD7111 WR input is edge triggered and re-
quires a rising edge to load new data to the DAC. The AD7111A
WR is level triggered to allow transparent operation of the
latches, if required. It should also be noted that the AD7111A is
exactly pin and function-compatible with the AD7524, an in-
dustry standard 8-bit multiplying DAC. This allows an easy up-
grading of existing AD7524 designs which would benefit both
from the wider dynamic range and the finer step resolution of-
fered by the AD7111A.
The AD7111/AD7111A are fabricated in Linear Compatible
CMOS (LC
combines precision bipolar circuits with low power CMOS logic.
LOGDAC is a registered trademark of Analog Devices, Inc.
REV. 0
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.
FEATURES
Dynamic Range: 88.5 dB
Resolution: 0.375 dB
On-Chip Data Latches
+5 V Operation
AD7111A Pin Compatible with AD7524
Low Power
APPLICATIONS
Audio Attenuators
Sonar Systems
Function Generators
Digitally Controlled AGC System
2
MOS), an advanced, mixed technology process that
PRODUCT HIGHLIGHTS
1. Wide Dynamic Range: 0 dB to 88.5 dB attenuation range in
2. Small Package: The AD7111/AD7111A are available in
3. Transparent Latch Operation: By tying the CS and WR in-
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
4. Fast Microprocessor Interface: Data setup times of 25 ns and
0.375 dB steps.
16-pin DIPs and SOIC packages.
puts low, the DAC latches in the AD7111A can be made
transparent.
write pulse width of 57 ns make the AD7111A compatible
with modern microprocessors.
CONTROL LOGIC
CONTROL LOGIC
AD7111A
Logarithmic D/A Converter
AD7111
CS
CS
FUNCTIONAL BLOCK DIAGRAMS
V
V
DD
DD
WR
WR
V
V
IN
IN
AD7111/AD7111A
DECODE LOGIC
DECODE LOGIC
17-BIT LATCH
8-BIT BUFFER
17-BIT LATCH
8-BIT BUFFER
17-BIT DAC
17-BIT DAC
D0 – D7
D0 – D7
LC
2
MOS LOGDAC
DGND
DGND
Fax: 617/326-8703
R
I
R
I
AGND
AGND
OUT
OUT
FB
FB

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AD7111A Summary of contents

Page 1

... MPU bus via an 8-bit data port and standard microprocessor control lines. The AD7111 WR input is edge triggered and re- quires a rising edge to load new data to the DAC. The AD7111A WR is level triggered to allow transparent operation of the latches, if required. It should also be noted that the AD7111A is exactly pin and function-compatible with the AD7524, an in- dustry standard 8-bit multiplying DAC ...

Page 2

... AD7111/AD7111A–SPECIFICATIONS AD7111–ELECTRICAL CHARACTERISTICS AD7111L/C/U Grades Parameter NOMINAL RESOLUTION 0.375 ACCURACY RELATIVE ATTENUATION 0.375 dB Steps: Accuracy 0. Monotonic 0.75 dB Steps: Accuracy 0. Monotonic 1.5 dB Steps: Accuracy 0 Monotonic Full Range 3.0 dB Steps: Accuracy 1 ...

Page 3

... These characteristics are included for design guidance only and are not subject = AGND = DGND = O V, output amplifier AD711 except where noted. OUT AD7111AB Grade + MIN MAX A A 0.005 0.001 0.005 1 ...

Page 4

... 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 AD7111/AD7111A 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 ...

Page 5

... A minimum time t , the refresh time, is required for RFSH the data to propagate through the decoder before a new data write is attempted. In contrast, the AD7111A WR input is level triggered to allow transparent operation of the latches if required. The transfer function for the circuit of Figure 1 is given by: 0. 375 – ...

Page 6

... D/A converter. Figures 4 and 5 show the performance of the AD7111/AD7111A using the AD711, a high speed, low cost BiFET amplifier, and the OP275, a dual, bipolar/JFET, audio amplifier. The perfor- mance without C1 is shown in the middle trace and the re- sponse with C1 in circuit shown in the bottom trace ...

Page 7

... V OUT IN 00000000. The accuracy and monotonic range specifications of the AD7111/AD7111A are not affected in any way by this gain trim procedure. For the AD7111/AD7111A L/C/U grades, suit- able values for R1 and R2 of Figure 1 are R1 = 500 , R2 = 180 ; for the K/B/T grades, suitable value are R1 = 1000 , R2 = 270 . For additional information on gain error the reader is referred to the “ ...

Page 8

... AD7111/AD7111A–Typical Performance Characteristics 2 + –10V IN DATA INPUT = 1111XXXX 1.5 1.0 0.5 0.0 –40 – TEMPERATURE – C Figure 10. Output Leakage Current vs. Temperature 10 1/2 OP – 275 C1 = 0pF 0 1/2 OP – 275 C1 = 15pF –10 AD711 C1 = 0pF V = +5V – + DATA INPUT CODE = 0000 0000 rms IN – ...

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