AD7111ABR Analog Devices Inc, AD7111ABR Datasheet

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AD7111ABR

Manufacturer Part Number
AD7111ABR
Description
IC DAC LOGARITHMIC 16-SOIC
Manufacturer
Analog Devices Inc
Series
LOGDAC®r
Datasheet

Specifications of AD7111ABR

Rohs Status
RoHS non-compliant
Number Of Bits
17
Number Of Converters
1
Voltage Supply Source
Single Supply
Power Dissipation (max)
1W
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (0.300", 7.5mm Width)
Data Interface
-
Settling Time
-

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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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AD7111ABR Summary of contents

Page 1

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 GENERAL DESCRIPTION The LOGDAC AD7111/AD7111A are monolithic ...

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. ...

Page 3

AD7111A–ELECTRICAL CHARACTERISTICS Parameter NOMINAL RESOLUTION 0.375 ACCURACY RELATIVE ATTENUATION 0.375 dB Steps: Accuracy 0. Monotonic 0.75 dB Steps: Accuracy 0. Monotonic ...

Page 4

... AD7111A ORDERING GUIDE Specified Temperature Accuracy Model Range Range AD7111ABN – + AD7111ACN – + AD7111ABR – + AD7111ACR – + NOTE Plastic DIP SOIC. TERMINOLOGY RESOLUTION: Nominal change in attenuation when moving between two adjacent codes. MONOTONICITY: The device is monotonic if the analog out- put decreases (or remains constant) as the digital code increases. ...

Page 5

Write Cycle Timing Diagram CIRCUIT DESCRIPTION GENERAL CIRCUIT DESCRIPTION The AD7111/AD7111A consists of a 17-bit R-2R CMOS mul- tiplying D/A converter with extensive digital logic. The logic translates the 8-bit binary input into a 17-bit word which is used to ...

Page 6

AD7111/AD7111A For example, the AD7111L is guaranteed monotonic in 0.375 dB steps from –54 dB inclusive and in 0.75 dB steps from –72 dB inclusive. To achieve monotonic operation over the entire 88.5 dB ...

Page 7

Another error arises from the output amplifier s input offset voltage. The amplifier is operated with a fixed feedback resis- tance, but the equivalent source impedance (the AD7111/ AD7111A output impedance) varies as a function of attenuation level. This has ...

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 ...

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