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參數資料
| 型號： | AD7945 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | +3.3 V/+5 V Multiplying 12-Bit DACs(12位乘法D/A轉換器) |
| 中文描述： | 3.3伏/ 5伏乘以12位DAC（12位乘法的D / A轉換器） |
| 文件頁數： | 4/16頁 |
| 文件大?。?/td> | 340K |
| 代理商： | AD7945 |
AD7943/AD7945/AD7948
AC PERFORMANCE CHARACTERISTICS
NORMAL MODE
(AD7943: V
DD
= +4.5 V to +5.5 V; V
IOUT1
= V
IOUT2
= AGND = 0 V. AD7945, AD7948: V
DD
= +4.5 V to +5.5 V; V
IOUT1
=AGND =
0 V. V
REF
= 6 V rms, 1 kHz sine wave; T
A
= T
MIN
to T
MAX
; DAC output op amp is AD843; unless otherwise noted.) These characteristics are in-
cluded for Design Guidance and are not subject to test.
REV. B
–4–
Parameter
B Grades
T Grade
Units
Test Conditions/Comments
DYNAMIC PERFORMANCE
Output Voltage Settling Time
600
700
ns typ
To 0.01% of Full-Scale Range. V
REF
=
+10 V; DAC Latch Alternately Loaded with
All 0s and All 1s
Measured with V
REF
= 0 V. DAC Latch
Alternately Loaded with All 0s and All 1s
DAC Latch Loaded with All 0s
All 1s Loaded to DAC
All 0s Loaded to DAC
Feedthrough to the DAC Output with
LD1
,
LD2
High and Alternate Loading of All 0s
and All 1s into the Input Shift Register
Feedthrough to the DAC Output with
CS
High and Alternate Loading of All 0s and
All 1s to the DAC Bus
Digital to Analog Glitch Impulse
60
60
nV-s typ
Multiplying Feedthrough Error
Output Capacitance
–75
60
30
5
–75
60
30
5
dB max
pF max
pF max
nV-s typ
Digital Feedthrough (AD7943)
Digital Feedthrough (AD7945, AD7948) 5
5
nV-s typ
Total Harmonic Distortion
Output Noise Spectral Density
@ 1 kHz
–83
–83
dB typ
35
35
nV/
√
Hz
typ
All 1s Loaded to DAC. V
REF
= 0 V. Output
Op Amp Is OP07
Specifications subject to change without notice.
AC PERFORMANCE CHARACTERISTICS
BIASED MODE
(AD7943: V
DD
= +3 V to +5.5 V; V
IOUT1
= V
IOUT2
= AGND = 1.23 V. AD7945, AD7948: V
DD
= +3 V to +5.5 V; V
IOUT1
= AGND =
1.23 V. V
REF
= 1 kHz, 2.45 V p-p, sine wave biased at 1.23 V; DAC output op amp is AD820; T
A
= T
MIN
to T
MAX
; unless otherwise noted.) These
characteristics are included for Design Guidance and are not subject to test.
Parameter
A Grades
Units
Test Conditions/Comments
DYNAMIC PERFORMANCE
Output Voltage Settling Time
5
μ
s typ
To 0.01% of Full-Scale Range. V
REF
= 0 V
DAC Latch Alternately Loaded with All 0s and All 1s
V
REF
= 1.23 V. DAC Register Alternately Loaded
with All 0s and All 1s
DAC Latch Loaded with All 0s
All 1s Loaded to DAC
All 0s Loaded to DAC
Feedthrough to the DAC Output with
LD1
,
LD2
High and Alternate Loading of All 0s and All 1s
into the Input Shift Register
Feedthrough to the DAC Output with CS High
and Alternate Loading of All 0s and All 1s to the
DAC Bus
Digital to Analog Glitch Impulse
60
nV-s typ
Multiplying Feedthrough Error
Output Capacitance
–75
60
30
5
dB max
pF max
pF max
nV-s typ
Digital Feedthrough
Digital Feedthrough (AD7945, AD7948)
5
nV-s typ
Total Harmonic Distortion
Output Noise Spectral Density
@ 1 kHz
–83
dB typ
25
nV/
√
Hz
typ
All 1s Loaded to DAC. V
REF
= 1.23 V
Specifications subject to change without notice.
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