AD7118 Analog Devices, AD7118 Datasheet - Page 2

• Manufacturer Part Number: AD7118
• Description: LOGDAC CMOS Logarithmic D/A Converter
• Manufacturer: Analog Devices

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