AD7678 查看數據表（PDF） - Analog Devices
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AD7678 Datasheet PDF : 23 Pages
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Parameter
Conditions
Min
Typ
Max
POWER SUPPLIES (Continued)
Power Dissipation6, 7
In Power-Down Mode9
444 kSPS Throughput8
100 SPS Throughput8
570 kSPS Throughput5
64
74
15
93
107
7
TEMPERATURE RANGE10
Specified Performance
TMIN to TMAX
–40
+85
NOTES
1LSB means least significant bit. With the ±5 V input range, one LSB is 152.588 µV.
2See Definition of Specifications section. These specifications do not include the error contribution from the external reference.
3All specifications in dB are referred to a full-scale input FS. Tested with an input signal at 0.5 dB below full scale, unless otherwise specified.
4The max should be the minimum of 5.25 V and DVDD + 0.3 V.
5In Warp Mode.
6Tested in Parallel Reading Mode.
7Tested with the 0 V to 5 V range and VIN – VINGND = 0 V. See Power Dissipation section.
8In Impulse Mode.
9With OVDD below DVDD + 0.3 V and all digital inputs forced to DVDD or DGND, respectively.
10Contact factory for extended temperature range.
Specifications subject to change without notice.
AD7665
Unit
mW
µW
mW
µW
°C
Table I. Analog Input Configuration
Input Voltage
Range
IND(4R)
INC(4R)
±4 REF2
VIN
±2 REF
VIN
±REF
VIN
0 V to 4 REF
VIN
0 V to 2 REF
VIN
0 V to REF
VIN
INGND
VIN
VIN
VIN
VIN
VIN
NOTES
1Typical analog input impedance.
2With REF = 3 V, in this range, the input should be limited to –11 V to +12 V.
3For this range the input is high impedance.
INB(2R)
INGND
INGND
VIN
INGND
VIN
VIN
INA(R)
REF
REF
REF
INGND
INGND
VIN
Input
Impedance1
5.85 kW
3.41 kW
2.56 kW
3.41 kW
2.56 kW
Note 3
TIMING SPECIFICATIONS (–40؇C to +85؇C, AVDD = DVDD = 5 V, OVDD = 2.7 V to 5.25 V, unless otherwise noted.)
Parameter
Symbol Min
Typ
Max
Unit
Refer to Figures 11 and 12
Convert Pulsewidth
t1
Time between Conversions
t2
(Warp Mode/Normal Mode/Impulse Mode)
CNVST LOW to BUSY HIGH Delay
t3
BUSY HIGH All Modes Except in Master Serial Read after t4
Convert Mode (Warp Mode/Normal Mode/Impulse Mode)
Aperture Delay
t5
End of Conversion to BUSY LOW Delay
t6
Conversion Time (Warp Mode/Normal Mode/Impulse Mode) t7
Acquisition Time
t8
RESET Pulsewidth
t9
Refer to Figures 13, 14, 15, and 16 (Parallel Interface Modes)
CNVST LOW to DATA Valid Delay
t10
(Warp Mode/Normal Mode/Impulse Mode)
DATA Valid to BUSY LOW Delay
t11
Bus Access Request to DATA Valid
t12
Bus Relinquish Time
t13
5
1.75/2/2.25
2
10
1
10
20
5
ns
Note 1
µs
30
ns
0.75/1/1.25 µs
ns
ns
0.75/1/1.25 µs
µs
ns
0.75/1/1.25 µs
ns
40
ns
15
ns
REV. C
–3–
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