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參數資料
| 型號： | AD7845BR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | LC2MOS Complete 12-Bit Multiplying DAC |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 2.5 us SETTLING TIME, 12-BIT DAC, PDSO24 |
| 封裝： | SOIC-24 |
| 文件頁數： | 2/12頁 |
| 文件大小： | 193K |
| 代理商： | AD7845BR |
(V
DD
= +15 V,
6
5%, V
SS
= –15 V,
6
5%, V
REF
= +10 V, AGND = DGND = O V,
V
OUT
connected to R
FB
. V
OUT
load = 2 k
V
, 100 pF. All specifications T
MIN
to T
MAX
unless otherwise noted.)
REV. B
–2–
AD7845–SPECIFICATIONS
1
Parameter
J Version
K Version
A Version
B Version
S Version
T Version
Units
Test Conditions/Comments
ACCURACY
Resolution
Relative Accuracy
at +25
°
C
T
to T
Differential Nonlinearity
Zero Code Offset Error
at +25
°
C
T
MIN
to T
MAX
Offset Temperature Coefficient;
(
Offset/
Temperature)
2
Gain Error
12
12
12
12
12
12
Bits
1
LSB =
All Grades Are Guaranteed
Monotonic over Temperature
DAC Register Loaded with
All 0s.
V
REF
2
12
=
2.4
mV
±
1
±
1
±
1
±
1/2
±
3/4
±
1
±
1
±
1
±
1
±
1/2
±
3/4
±
1
±
1
±
1
±
1
±
1/2
±
3/4
±
1
LSB max
LSB max
LSB max
±
2
±
3
±
1
±
2
±
2
±
3
±
1
±
2
±
2
±
4
±
1
±
3
mV max
mV max
±
5
±
3
±
6
±
6
±
7
±
5
±
2
±
6
±
6
±
7
±
5
±
3
±
6
±
6
±
7
±
5
±
2
±
6
±
6
±
7
±
5
±
3
±
6
±
6
±
7
±
5
±
2
±
6
±
6
±
7
μ
V/
°
C typ
LSB max
LSB max
LSB max
LSB max
R
FB
, V
OUT
Connected
R
C
, V
OUT
Connected, V
REF
= +5 V
R
B
, V
OUT
Connected, V
REF
= +5 V
R
A
, V
OUT
Connected, V
REF
= +2.5 V
Gain Temperature Coefficient;
(
Gain/
Temperature)
2
±
2
±
2
±
2
±
2
±
2
±
2
ppm of FSR/
°
C R
FB
, V
OUT
Connected
typ
REFERENCE INPUT
Input Resistance, Pin 17
8
16
8
16
8
16
8
16
8
16
8
16
k
min
k
max
Typical Input Resistance = 12 k
APPLICATION RESISTOR
RATIO MATCHING
0.5
0.5
0.5
0.5
0.5
0 5
% max
Matching Between R
A
, R
B
, R
C
DIGITAL INPUTS
V
IH
(Input High Voltage)
V
IL
(Input Low Voltage)
I
IN
(Input Current)
C
IN
(Input Capacitance)
2
POWER SUPPLY
4
V
DD
Range
V
Range
Power Supply Rejection
Gain/
V
DD
Gain/
V
SS
I
DD
I
SS
AC PERFORMANCE CHARACTERISTICS
These characteristics are included for Design Guidance and are not subject to test.
2.4
0.8
±
1
7
2.4
0.8
±
1
7
2.4
0.8
±
1
7
2.4
0.8
±
1
7
2.4
0.8
±
1
7
2.4
0.8
±
1
7
V min
V max
μ
A max
pF max
Digital Inputs at 0 V and V
DD
14.25/15.75
–14.25/–15.75 –14.25/–15.75 –14.25/–15.75 –14.25/–15.75
14.25/15.75
14.25/15.75
14.25/15.75
14.25/15.75
–14.25/–15.75 –14.25/–15.75
14.25/15.75
V min/V max
V min/V max
±
0.01
±
0.01
6
4
±
0.01
±
0.01
6
4
±
0.01
±
0.01
6
4
±
0.01
±
0.01
6
4
±
0.01
±
0.01
6
4
±
0.01
±
0.01
6
4
% per % max
% per % max
mA max
mA max
V
DD
= +15 V
±
5%, V
REF
= –10 V
V
SS
= –15 V
±
5%.
V
OUT
Unloaded
V
OUT
Unloaded
DYNAMIC PERFORMANCE
Output Voltage Settling Time
5
5
5
5
5
5
μ
s max
To 0.01% of Full-Scale Range
V
Load = 2 k
, 100 pF.
DAC Register Alternately Loaded
with All 0s and All 1s. Typically
2.5
μ
s at 25
°
C.
V
Load = 2 k
, 100 pF.
Measured with V
= 0 V.
DAC Register Alternately Loaded
with All 0s and All 1s.
V
=
±
10 V, 10 kHz Sine Wave
DAC Register Loaded with All 0s.
Slew Rate
Digital-to-Analog
Glitch Impulse
11
55
11
55
11
55
11
55
11
55
11
55
V/
μ
s typ
nV–s typ
Multiplying Feedthrough
Error
3
Unity Gain Small Signal
Bandwidth
5
5
5
5
5
5
mV p-p typ
600
600
600
600
600
600
kHz typ
V
, R
Connected. DAC Loaded
with All 1s V
REF
= 100 mV p-p
Sine Wave.
V
, R
Connected. DAC Loaded
with All 1s. V
REF
= 20 V p-p
Sine Wave. R
= 2 k
.
V
REF
= 6 V rms, 1 kHz Sine Wave.
Full Power Bandwidth
175
175
175
175
175
175
kHz typ
Total Harmonic Distortion
OUTPUT CHARACTERISTICS
5
Open Loop Gain
–90
–90
–90
–90
–90
–90
dB typ
85
85
85
85
85
85
dB min
V
OUT
, R
FB
Not Connected
V
OUT
=
±
10 V, R
= 2 k
R
L
, C
L
= 100 pF
R
FB
, V
OUT
Connected,
V
Shorted to AGND
Includes Noise Due to Output
Amplifier and Johnson Noise
of R
FB
Output Voltage Swing
Output Resistance
Short Circuit Current @ +25
°
C
Output Noise Voltage
(0.1 Hz to 10 Hz) @ +25
°
C
f = 10 Hz
f
=
100
Hz
f
= 1 kHz
f
=
10
kHz
f
=
100 kHz
±
10
0.2
11
±
10
0.2
11
±
10
0.2
11
±
10
0.2
11
±
10
0.2
11
±
10
0.2
11
V min
typ
mA typ
2
250
100
50
50
50
2
250
100
50
50
50
2
250
100
50
50
50
2
250
100
50
50
50
2
250
100
50
50
50
2
250
100
50
50
50
μ
V rms typ
nV/
√
Hz
typ
nV/
√
Hz
typ
nV/
√
Hz
typ
nV/
√
Hz
typ
nV/
√
Hz
typ
NOTES
1
Temperature ranges are as follows: J, K Versions: 0
°
C to +70
°
C; A, B Versions: –40
°
C to +85
°
C; S, T Versions: –55
°
C to +125
°
C.
2
Guaranteed by design and characterization, not production tested.
3
The metal lid on the ceramic D-24A package is connected to Pin 12 (DGND).
4
The device is functional with a power supply of
±
12 V.
5
Minimum specified load resistance is 2 k
.
Specifications subject to change without notice.
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