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Analog Devices Semiconductor Electronic Components Datasheet

AD711 Datasheet

BiFET Op Amp

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a
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
LC2MOS LOGDAC
Logarithmic D/A Converter
AD7111/AD7111A
FUNCTIONAL BLOCK DIAGRAMS
VDD
VIN
AD7111
17-BIT DAC
RFB
I OUT
AGND
17-BIT LATCH
DECODE LOGIC
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 (LC2MOS), an advanced, mixed technology process that
combines precision bipolar circuits with low power CMOS logic.
LOGDAC is a registered trademark of Analog Devices, Inc.
CONTROL LOGIC
8-BIT BUFFER
CS WR
VDD
VIN
D0 – D7
AD7111A
17-BIT DAC
DGND
RFB
I OUT
AGND
17-BIT LATCH
DECODE LOGIC
CONTROL LOGIC
8-BIT BUFFER
CS WR
D0 – D7
DGND
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.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703


Analog Devices Semiconductor Electronic Components Datasheet

AD711 Datasheet

BiFET Op Amp

No Preview Available !

AD7111/AD7111A–SPECIFICATIONS
AD7111–ELECTRICAL CHARACTERISTICS
(VDD = +5 V, VIN = –10 V dc, IOUT = AGND = DGND = O V output amplifier
AD711 except where noted)
Parameter
NOMINAL RESOLUTION
ACCURACY RELATIVE TO
0 dB ATTENUATION
0.375 dB Steps:
Accuracy ≤ ± 0.17 dB
Monotonic
0.75 dB Steps:
Accuracy ≤ ± 0.35 dB
Monotonic
1.5 dB Steps:
Accuracy ≤ ± 0.7 dB
Monotonic
3.0 dB Steps:
Accuracy ≤ ± 1.4 dB
Monotonic
6.0 dB Steps:
Accuracy ≤ ± 2.7 dB
Monotonic
GAIN ERROR
VIN INPUT RESISTANCE
RFB INPUT RESISTANCE
DIGITAL INPUTS
VIH (Input High Voltage)
VIL (Input Low Voltage)
Input Leakage Current
SWITCHING CHARACTERISTICS1
tCS
tCH
tWR
tDS
tDH
tRFSH
POWER SUPPLY
VDD
IDD
AD7111L/C/U Grades
TA = +25؇C TA = TMIN, TMAX
0.375
0.375
0 to 36
0 to 54
0 to 36
0 to 54
0 to 48
0 to 72
0 to 42
0 to 66
0 to 54
0 to 48
Full Range 0 to 78
0 to 66
0 to 54
Full Range Full Range
0 to 72
0 to 60
Full Range Full Range
± 0.1 ± 0.15
9/11/15
9/11/15
9.3/11.5/15.7 9.3/11.5/15.7
2.4 2.4
0.8 0.8
± 1 ± 10
00
00
350 500
175 250
10 10
3 4.5
+5 +5
14
500 1000
AD7111K/B/T Grades
TA = +25؇C TA = TMIN, TMAX
0.375
0.375
Units
dB
0 to 30
0 to 48
0 to 30
0 to 48
0 to 42
0 to 72
0 to 36
0 to 60
0 to 42
0 to 85.5
0 to 42
0 to 72
0 to 60
0 to 48
Full Range Full Range
0 to 60
0 to 48
Full Range Full Range
± 0.15
± 0.20
7/11/18
7/11/18
7.3/11.5/18.8 7.3/11.5/18.8
2.4 2.4
0.8 0.8
± 1 ± 10
00
00
350 500
175 250
10 10
3 4.5
+5 +5
14
500 1000
dB min
dB min
dB min
dB min
dB min
dB min
dB min
dB min
dB min
dB min
dB max
kmin/typ/max
kmin/typ/max
V min
V max
µA max
ns min
ns min
ns min
ns min
ns min
µs min
V
mA max
µA max
NOTE
1Sample tested at +25°C to ensure compliance.
Specifications subject to change without notice.
Conditions/Comments
Guaranteed Attenuation Ranges
for Specified Step Sizes
Full Range Is from 0 dB
to 88.5 dB
Digital Inputs = VDD
Chip Select to Write Setup Time
Chip Select to Write Hold Time
Write Pulse Width
Data Valid to Write Setup Time
Data Valid to Write Hold Time
Refresh Time
Digital Inputs = VIL or VIH
Digital Inputs = 0 V or VDD;
See Figure 6
AC PERFORMANCE CHARACTERISTICS These characteristics are included for design guidance only and are not subject
to test. VDD = +5 V, VIN = –10 V dc except where noted, IOUT = AGND = DGND = O V, output amplifier AD711 except where noted.
Parameter
DC Supply Rejection, Gain/VDD
Propagation Delay
Digital-to-Analog Glitch Impulse
Output Capacitance, Pin 1
Input Capacitance, Pin 15 and Pin 16
Feedthrough at 1 kHz
Total Harmonic Distortion
Output Noise Voltage Density
Digital Input Capacitance
AD7111L/C/U Grades
TA = +25؇C TA = TMIN, TMAX
0.001
3.0
0.005
4.5
100
185 185
77
–94 –72
–91 –91
70 70
77
AD7111K/B/T Grades
TA = +25؇C TA = TMIN, TMAX Units
Conditions/Comments
0.001
3.0
100
0.005
4.5
185 185
77
–94 –68
–91 –91
70 70
77
dB per % max
µs max
nV secs typ
pF max
pF max
dB max
dB typ
nV/Hz max
pF max
VDD = ± 10%, Input Code = 00000000
Full-Scale Change Measured from
WR Going High, CS = 0 V
Measured with AD843 as Output
Amplifier for Code Transition
10000000 to 00000000
C1 of Figure 1 is 0 pF
VIN = 6 V rms at 1 kHz
Includes AD711 Amplifier Noise
Specifications subject to change without notice.
–2– REV. 0


Part Number AD711
Description BiFET Op Amp
Maker Analog Devices
Total Page 8 Pages
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