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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： | 9/16页 |
| 文件大小： | 329K |
| 代理商： | AD7945TQ |
REV. B
–2–
AD7943/AD7945/AD7948–SPECIFICATIONS1
Parameter
B Grades
2
T Grade
2, 3
Units
Test Conditions/Comments
ACCURACY
Resolution
12
Bits
1 LSB = VREF/2
12 = 2.44 mV when V
REF =10 V
Relative Accuracy
±0.5
LSB max
Differential Nonlinearity
±0.5
LSB max
All Grades Guaranteed Monotonic over
Temperature
Gain Error
TMIN to TMAX
±2
LSB max
Gain Temperature Coefficient
4
2
ppm FSR/
°C typ
5
ppm FSR/
°C max
Output Leakage Current
IOUT1
@ +25
°C
10
nA max
See Terminology Section
TMIN to TMAX
100
nA max
Typically 20 nA over Temperature
REFERENCE INPUT
Input Resistance
6
k
min
Typical Input Resistance = 9 k
12
k
max
DIGITAL INPUTS
VINH, Input High Voltage
2.4
V min
VINL, Input Low Voltage
0.8
V max
IINH, Input Current
±1
A max
CIN, Input Capacitance
4
10
pF max
DIGITAL OUTPUT (AD7943 SRO)
For 1 CMOS Load
Output Low Voltage (VOL)
0.2
V max
Output High Voltage (VOH)VDD – 0.2
VDD – 0.2
V min
POWER REQUIREMENTS
VDD Range
4.5/5.5
V min/V max
Power Supply Sensitivity
4
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 a 1 MHz STB
Frequency. At Input Levels of 0.8 V and 2.4 V,
IDD Is Typically 2.5 mA.
IDD (AD7945, AD7948)
5
A max
VINH = VDD – 0.1 V min, VINL = 0.1 V max.
Typically 1
A. At Input Levels of 0.8 V and
2.4 V, IDD Is Typically 2.5 mA.
NOTES
1The AD7943, AD7945 and AD7948 are specified in the normal current mode configuration and in the biased current mode for single-supply applications.
Figures 14 and 15 are examples of normal mode operation.
2Temperature ranges as follows: B Grades: –40
°C to +85°C; T Grade: –55°C to +125°C.
3The T Grade applies to the AD7945 only.
4Guaranteed by design.
Specifications subject to change without notice.
NORMAL MODE (AD7943: VDD = +4.5 V to +5.5 V; VIOUT1 = VIOUT2 = AGND = 0 V; VREF = +10 V; TA = TMIN to TMAX, unless otherwise noted.
AD7945, AD7948: VDD = +4.5 V to +5.5 V; VIOUT1 = AGND = 0 V; VREF = +10 V; TA = TMIN to TMAX, unless otherwise noted.)
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