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AD7111BQ

P1-P3P4-P6P7-P8
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.
a
LC
2
MOS LOGDAC
Logarithmic D/A Converter
AD7111/AD7111A
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703
FUNCTIONAL BLOCK DIAGRAMS
17-BIT DAC
17-BIT LATCH
DECODE LOGIC
8-BIT BUFFER
CONTROL LOGIC
AD7111
I
OUT
AGND
R
FB
V
DD
V
IN
DGND
CS
WR
D0 – D7
17-BIT DAC
17-BIT LATCH
DECODE LOGIC
8-BIT BUFFER
CONTROL LOGIC
AD7111A
I
OUT
AGND
R
FB
V
DD
V
IN
DGND
CS
WR
D0 – D7
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 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
2
MOS), an advanced, mixed technology process that
combines precision bipolar circuits with low power CMOS logic.
LOGDAC is a registered trademark of Analog Devices, Inc.
PRODUCT HIGHLIGHTS
1. Wide Dynamic Range: 0 dB to 88.5 dB attenuation range in
0.375 dB steps.
2. Small Package: The AD7111/AD7111A are available in
16-pin DIPs and SOIC packages.
3. Transparent Latch Operation: By tying the
CS and WR in-
puts low, the DAC latches in the AD7111A can be made
transparent.
4. Fast Microprocessor Interface: Data setup times of 25 ns and
write pulse width of 57 ns make the AD7111A compatible
with modern microprocessors.
AD7111L/C/U Grades AD7111K/B/T Grades
Parameter T
A
= +258CT
A
= T
MIN
, T
MAX
T
A
= +258CT
A
= T
MIN
, T
MAX
Units Conditions/Comments
NOMINAL RESOLUTION 0.375 0.375 0.375 0.375 dB
ACCURACY RELATIVE TO
0 dB ATTENUATION
0.375 dB Steps:
Accuracy ≤ ±0.17 dB 0 to 36 0 to 36 0 to 30 0 to 30 dB min Guaranteed Attenuation Ranges
Monotonic 0 to 54 0 to 54 0 to 48 0 to 48 dB min for Specified Step Sizes
0.75 dB Steps:
Accuracy ≤ ±0.35 dB 0 to 48 0 to 42 0 to 42 0 to 36 dB min
Monotonic 0 to 72 0 to 66 0 to 72 0 to 60 dB min
1.5 dB Steps:
Accuracy ≤ ±0.7 dB 0 to 54 0 to 48 0 to 42 0 to 42 dB min Full Range Is from 0 dB
Monotonic Full Range 0 to 78 0 to 85.5 0 to 72 dB min to 88.5 dB
3.0 dB Steps:
Accuracy ≤ ±1.4 dB 0 to 66 0 to 54 0 to 60 0 to 48 dB min
Monotonic Full Range Full Range Full Range Full Range dB min
6.0 dB Steps:
Accuracy ≤ ±2.7 dB 0 to 72 0 to 60 0 to 60 0 to 48 dB min
Monotonic Full Range Full Range Full Range Full Range dB min
GAIN ERROR ±0.1 ±0.15 ±0.15 ±0.20 dB max
V
IN
INPUT RESISTANCE 9/11/15 9/11/15 7/11/18 7/11/18 kΩ min/typ/max
R
FB
INPUT RESISTANCE 9.3/11.5/15.7 9.3/11.5/15.7 7.3/11.5/18.8 7.3/11.5/18.8 kΩ min/typ/max
DIGITAL INPUTS
V
IH
(Input High Voltage) 2.4 2.4 2.4 2.4 V min
V
IL
(Input Low Voltage) 0.8 0.8 0.8 0.8 V max
Input Leakage Current ±1 ±10 ±1 ±10 µA max Digital Inputs = V
DD
SWITCHING CHARACTERISTICS
1
t
CS
0 0 0 0 ns min
Chip Select to Write Setup Time
t
CH
0 0 0 0 ns min Chip Select to Write Hold Time
t
WR
350 500 350 500 ns min Write Pulse Width
t
DS
175 250 175 250 ns min Data Valid to Write Setup Time
t
DH
10 10 10 10 ns min Data Valid to Write Hold Time
t
RFSH
3 4.5 3 4.5 µs min Refresh Time
POWER SUPPLY
V
DD
+5 +5 +5 +5 V
I
DD
1 4 1 4 mA max Digital Inputs = V
IL
or V
IH
500 1000 500 1000 µA max Digital Inputs = 0 V or V
DD
;
See Figure 6
NOTE
1
Sample tested at +25°C to ensure compliance.
Specifications subject to change without notice.
AD7111–ELECTRICAL CHARACTERISTICS
REV. 0
–2–
AD7111/AD7111A–SPECIFICATIONS
(V
DD
= +5 V, V
IN
= –10 V dc, I
OUT
= AGND = DGND = O V output amplifier
AD711 except where noted)
AC PERFORMANCE CHARACTERISTICS
These characteristics are included for design guidance only and are not subject
to test. V
DD
= +5 V, V
IN
= –10 V dc except where noted, I
OUT
= AGND = DGND = O V, output amplifier AD711 except where noted.
AD7111L/C/U Grades AD7111K/B/T Grades
Parameter T
A
= +258CT
A
= T
MIN
, T
MAX
T
A
= +258CT
A
= T
MIN
, T
MAX
Units Conditions/Comments
DC Supply Rejection, ∆Gain/∆V
DD
0.001 0.005 0.001 0.005 dB per % max
∆V
DD
= ±10%, Input Code = 00000000
Propagation Delay 3.0 4.5 3.0 4.5 µs max Full-Scale Change Measured from
WR Going High, CS = 0 V
Digital-to-Analog Glitch Impulse 100 100 nV secs typ Measured with AD843 as Output
Amplifier for Code Transition
10000000 to 00000000
C1 of Figure 1 is 0 pF
Output Capacitance, Pin 1 185 185 185 185 pF max
Input Capacitance, Pin 15 and Pin 16 7 7 7 7 pF max
Feedthrough at 1 kHz –94 –72 –94 –68 dB max
Total Harmonic Distortion –91 –91 –91 –91 dB typ V
IN
= 6 V rms at 1 kHz
Output Noise Voltage Density 70 70 70 70 nV/√Hz max Includes AD711 Amplifier Noise
Digital Input Capacitance 7 7 7 7 pF max
Specifications subject to change without notice.
AD7111/AD7111A
REV. 0
–3–
AD7111A–ELECTRICAL CHARACTERISTICS
AD7111AC Grade AD7111AB Grade
Parameter T
A
= +258CT
A
= T
MIN
, T
MAX
T
A
= +258CT
A
= T
MIN
, T
MAX
Units Conditions/Comments
NOMINAL RESOLUTION 0.375 0.375 0.375 0.375 dB
ACCURACY RELATIVE TO
0 dB ATTENUATION
0.375 dB Steps:
Accuracy ≤ ±0.17 dB 0 to 36 0 to 36 0 to 30 0 to 30 dB min Guaranteed Attenuation Ranges
Monotonic 0 to 54 0 to 54 0 to 48 0 to 48 dB min for Specified Step Sizes
0.75 dB Steps:
Accuracy ≤ ±0.35 dB 0 to 48 0 to 42 0 to 42 0 to 36 dB min
Monotonic 0 to 72 0 to 66 0 to 72 0 to 60 dB min
1.5 dB Steps:
Accuracy ≤ ±0.7 dB 0 to 54 0 to 48 0 to 48 0 to 42 dB min Full Range Is from 0 dB
Monotonic Full Range 0 to 78 0 to 85.5 0 to 72 dB min to 88.5 dB
3.0 dB Steps:
Accuracy ≤ ±1.4 dB 0 to 66 0 to 54 0 to 60 0 to 48 dB min
Monotonic Full Range Full Range Full Range Full Range dB min
6.0 dB Steps:
Accuracy ≤ ±2.7 dB 0 to 72 0 to 60 0 to 60 0 to 48 dB min
Monotonic Full Range Full Range Full Range Full Range dB min
GAIN ERROR ±0.1 ±0.15 ±0.15 ±0.20 dB max
V
IN
INPUT RESISTANCE 9/11/15 9/11/15 7/11/18 7/11/18 kΩ min/typ/max
R
FB
INPUT RESISTANCE 9.3/11.5/15.7 9.3/11.5/15.7 7.3/11.5/18.8 7.3/11.5/18.8 kΩ min/typ/max
DIGITAL INPUTS
V
IH
(Input High Voltage) 2.4 2.4 2.4 2.4 V min
V
IL
(Input High Voltage) 0.8 0.8 0.8 0.8 V max
Input Leakage Current ±1 ±10 ±1 ±10 µA max Digital Inputs = V
DD
SWITCHING CHARACTERISTICS
1
t
CS
0 0 0 0 ns min
Chip Select to Write Setup Time
t
CH
0 0 0 0 ns min Chip Select to Write Hold Time
t
WR
57 57 57 57 ns min Write Pulse Width
t
DS
25 25 25 25 ns min Data Valid to Write Setup Time
t
DH
10 10 10 10 ns min Data Valid to Write Hold Time
POWER SUPPLY
V
DD
+5 +5 +5 +5 V Digital Inputs = V
IL
or V
IH
I
DD
1 2 1 2 mA max CS = WR = 0 V
1 1 1 1 mA max Digital Inputs = 0 V or V
DD
;
See Figure 6
NOTE
1
Sample tested at +25°C to ensure compliance.
Specifications subject to change without notice.
(V
DD
= +5 V, V
IN
= –10 V dc, I
OUT
= AGND = DGND = O V output amplifier
AD711 except where noted)
AC PERFORMANCE CHARACTERISTICS
These characteristics are included for design guidance only and are not subject
to test. V
DD
= +5 V, V
IN
= –10 V dc except where noted, I
OUT
= AGND = DGND = O V, output amplifier AD711 except where noted.
AD7111AC Grade AD7111AB Grade
Parameter T
A
= +258CT
A
= T
MIN
, T
MAX
T
A
= +258CT
A
= T
MIN
, T
MAX
Units Conditions/Comments
DC Supply Rejection, ∆Gain/∆V
DD
0.001 0.005 0.001 0.005 dB per % max
∆V
DD
= ±10%, Input Code = 00000000
Propagation Delay 1 1.5 1 1.5 µs max Full-Scale Change Measured from
WR Going High, CS = 0 V
Digital-to-Analog Glitch Impulse 10 20 10 20 nV secs typ Measured with AD843 as Output
Amplifier for Code Transition
10000000 to 00000000
C1 of Figure 1 is 0 pF
Output Capacitance, Pin 1 50 50 50 50 pF max
Input Capacitance, Pin 15 and Pin 16 7 7 7 7 pF max
Feedthrough at 1 kHz –94 –90 –92 –90 dB max
Total Harmonic Distortion –91 –91 –91 –91 dB typ V
IN
= 6 V rms at 1 kHz
Output Noise Voltage Density 70 70 70 70 nV/√Hz max Includes AD711 Amplifier Noise
Digital Input Capacitance 7 7 7 7 pF max
Specifications subject to change without notice.
P1-P3P4-P6P7-P8

AD7111BQ

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Manufacturer:
Analog Devices Inc.
Description:
Digital to Analog Converters - DAC MONO Multiplying IC
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