AD7945ARS-B データシートの表示（PDF） - Analog Devices
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AD7945ARS-B Datasheet PDF : 16 Pages
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AD7943/AD7945/AD7948
SPECIFICATIONS1
BIASED MODE (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.)
Parameter
A Grades2 Units
Test Conditions/Comments
ACCURACY
Resolution
Relative Accuracy
Differential Nonlinearity
Gain Error @ +25°C
TMIN to TMAX
Gain Temperature Coefficient3
Output Leakage Current
IOUT1
@ +25°C
TMIN to TMAX
Input Resistance
@ IOUT2 Pin (AD7943)
@ AGND Pin (AD7945, AD7948)
12
±1
± 0.9
±3
±4
2
5
10
100
6
6
Bits
LSB max
LSB max
LSB max
LSB max
ppm FSR/°C typ
ppm FSR/°C max
1 LSB = (VIOUT1 – VREF)/212 = 300 µV When
VIOUT1 = 1.23 V and VREF = 0 V
All Grades Guaranteed Monotonic
over Temperature
See Terminology Section
nA max
nA max
kΩ min
kΩ min
Typically 20 nA over Temperature
This Varies with DAC Input Code
DIGITAL INPUTS
VINH, Input High Voltage @ VDD = +5 V
VINH, Input High Voltage @ VDD = +3.3 V
VINL, Input Low Voltage @ VDD = +5 V
VINL, Input Low Voltage @ VDD = +3.3 V
IINH, Input Current
CIN, Input Capacitance3
DIGITAL OUTPUT (SRO)
Output Low Voltage (VOL)
Output High Voltage (VOH)
POWER REQUIREMENTS
VDD Range
Power Supply Sensitivity3
∆Gain/∆VDD
IDD (AD7943)
2.4
2.1
0.8
0.6
±1
10
0.2
VDD – 0.2
3.0/5.5
–75
5
V min
V min
V max
V max
µA max
pF max
V max
V min
V min/V max
dB typ
µA max
IDD (AD7945, AD7948)
5
µA max
For 1 CMOS Load
VINH = VDD – 0.1 V min, VINL = 0.1 V max.
SRO Open Circuit; No STB Signal; Typically
1 µA. Typically 100 µA with 1 MHz STB
Frequency.
VINH = VDD – 0.1 V min, VINL = 0.1 V max.
Typically 1 µA.
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.
REV. B
–3–
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