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AD7118 Fiches technique(PDF) 2 Page - Analog Devices

No de pièce AD7118
Description  LOGDAC CMOS Logarithmic D/A Converter
Download  6 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD7118 Fiches technique(HTML) 2 Page - Analog Devices

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AD7118–SPECIFICATIONS
(VDD = +5 V or +15 V, VIN = –10 V dc, IOUT = AGND = DGND = 0 V, output amplifier
AD544 except where noted)
Accuracy Specification for L/C/U Grade Devices at TA = +25°C
REV. A
–2–
TA = +25 CTA = TMIN, TMAX
Parameter
VDD = +5 V
VDD = +15 V VDD = +5 V
VDD = +15 V Units
Test Conditions/Comments
NOMINAL RESOLUTION
1.5
1.5
1.5
1.5
dB
ACCURACY RELATIVE TO VIN
AD7118L/C/U
0 dB to –30 dB
±0.35
±0.35
±0.4
±0.4
dB max
Accuracy is measured using
–31.5 dB to –42 dB
±0.7
±0.5
±0.8
±0.7
dB max
circuit of Figure 1 and includes
–43.5 dB to –48 dB
±1.0
±0.7
±1.3
±1.0
dB max
any effects due to mismatch
AD7118K/B/T
between RFB and the R-2R
0 dB to –30 dB
±0.5
±0.5
±0.5
±0.5
dB max
ladder circuit.
–31.5 dB to –42 dB
±0.75
±0.75
±1.0
±0.8
dB max
MONOTONIC RANGE
Nominal 1.5 dB Steps
L/C/U Grade
Monotonic Over Full
0 to –72
0 to –72
dB
Digital Inputs 000000 to 110000
K/B/T Grade
Code Range
0 to –66
0 to –66
dB
Digital Inputs 000000 to 101100
Nominal 3 dB Steps
All Grades
Monotonic Over Full Code Range
VIN INPUT RESISTANCE
All Grades
9
9
9
9
k
Ω min
(PIN 12)
L/C/U Grade
17
17
17
17
k
Ω max
K/B/T Grade
21
21
21
21
k
Ω max
RFB INPUT RESISTANCE
All Grades
9.45
9.45
9.45
9.45
k
Ω min
(PIN 13)
L/C/U Grade
18
18
18
18
k
Ω max
K/B/T Grade
22
22
22
22
k
Ω max
DIGITAL INPUTS
Input High Voltage Requirements VIH
3.0
13.5
3.0
13.5
V min
Input Low Voltage Requirements VIL
0.8
1.5
0.8
1.5
V max
Input Leakage Current
±1
±1
±10
±10
µA max
Digital Inputs = VDD
POWER SUPPLY
VDD for Specified Accuracy
5
5
V min
15
15
V max
IDD
0.5
1
1
2
mA max
Digital Inputs = 0 V or VDD
(See Figure 7)
Specifications subject to change without notice.
AC PERFORMANCE CHARACTERISTICS
These characteristics are included for design guidance only and are not subject to test.
TA = +25 CTA = TMIN, TMAX
Parameter
VDD = +5 V VDD = +15 V VDD = +5 V VDD = +15 V Units
DC Supply Rejection,
∆Gain/∆V
DD
0.01
0.005
0.01
0.005
dB per % max
∆V
DD = ± 10%,
Input code = 100000
Propagation Delay
1.8
0.4
2.2
0.5
µs max
Full-Scale Change
Digital-to-Analog Glitch Impulse
225
1200
nV secs typ
Measured with ADLH0032CG
as output amplifier for input
code transition 100000 to 000000.
C1 of Figure 1 is 0 pF.
Output Capacitance (Pin 14)
100
100
100
100
pF max
Input Capacitance Pin 12 and Pin 13
7
7
7
7
pF max
Feedthrough at 1 kHz
L/C/U Grade
–86
–86
–68
–68
dB max
Feedthrough is also deter-
K/B/T Grade
–80
–80
–63
–63
dB max
mined by circuit layout
Total Harmonic Distortion
–85
–85
–85
–85
dB typ
VIN = 6 V rms
Intermodulation Distortion
–79
–79
–79
–79
dB typ
per DIN 45403 Blatt 4
Output Noise Voltage Density
70
70
70
70
nV/
√Hz max
Includes AD544 amplifier noise
Digital Input Capacitance
7
7
7
7
pF max
Specifications subject to change without notice.
(VDD = +5 V or +15 V, VIN = –10 V except where stated, IOUT = AGND = DGND =
0 V, output amplifier AD544 except where noted)
Accuracy Specification for K/B/T Grade Devices at TA = +25°C


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