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参数资料
| 型号： | AD7945TQ |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | DAC |
| 英文描述： | +3.3 V/+5 V Multiplying 12-Bit DACs |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 0.7 us SETTLING TIME, 12-BIT DAC, CDIP20 |
| 封装： | GLASS SEALED, CERDIP-20 |
| 文件页数： | 10/16页 |
| 文件大小： | 329K |
| 代理商： | AD7945TQ |
AD7943/AD7945/AD7948
REV. B
–3–
Parameter
A Grades2 Units
Test Conditions/Comments
ACCURACY
Resolution
12
Bits
1 LSB = (VIOUT1 – VREF)/2
12 = 300
V When
VIOUT1 = 1.23 V and VREF = 0 V
Relative Accuracy
±1
LSB max
Differential Nonlinearity
±0.9
LSB max
All Grades Guaranteed Monotonic
over Temperature
Gain Error @ +25
°C
±3
LSB max
TMIN to TMAX
±4
LSB max
Gain Temperature Coefficient
3
2
ppm FSR/
°C typ
5
ppm FSR/
°C max
Output Leakage Current
See Terminology Section
IOUT1
@ +25
°C
10
nA max
TMIN to TMAX
100
nA max
Typically 20 nA over Temperature
Input Resistance
This Varies with DAC Input Code
@ IOUT2 Pin (AD7943)
6
k
min
@ AGND Pin (AD7945, AD7948)
6
k
min
DIGITAL INPUTS
VINH, Input High Voltage @ VDD = +5 V
2.4
V min
VINH, Input High Voltage @ VDD = +3.3 V
2.1
V min
VINL, Input Low Voltage @ VDD = +5 V
0.8
V max
VINL, Input Low Voltage @ VDD = +3.3 V
0.6
V max
IINH, Input Current
±1
A max
CIN, Input Capacitance
3
10
pF max
DIGITAL OUTPUT (SRO)
For 1 CMOS Load
Output Low Voltage (VOL)
0.2
V max
Output High Voltage (VOH)VDD – 0.2
V min
POWER REQUIREMENTS
VDD Range
3.0/5.5
V min/V max
Power Supply Sensitivity
3
Gain/V
DD
–75
dB typ
IDD (AD7943)
5
A max
VINH = VDD – 0.1 V min, VINL = 0.1 V max.
SRO Open Circuit; No STB Signal; Typically
1
A. Typically 100 A with 1 MHz STB
Frequency.
IDD (AD7945, AD7948)
5
A max
VINH = VDD – 0.1 V min, VINL = 0.1 V max.
Typically 1
A.
NOTES
1These specifications apply with the devices biased up at 1.23 V for single supply applications. The model numbering reflects this by means of a “–B” suffix
(for example: AD7943AN-B). Figure 16 is an example of Biased Mode Operation.
2Temperature ranges as follows: A Versions: –40
°C to +85°C.
3Guaranteed by design.
Specifications subject to change without notice.
BIASED MODE
SPECIFICATIONS1
(AD7943: VDD = +3 V to +5.5 V; VIOUT1 =VIOUT2 = AGND = 1.23 V; VREF = +0 V to 2.45 V; TA = TMIN to TMAX, unless other-
wise noted. AD7945, AD7948: VDD = +3 V to +5.5 V; VIOUT1 = AGND = 1.23 V; VREF = +0 V to 2.45 V; TA = TMIN to TMAX, unless otherwise noted.)
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