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參數(shù)資料
| 型號： | LTC2420 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Micropower 20-bit ADC(微功耗，20位串行模數(shù)轉換器) |
| 中文描述： | 微功耗20位ADC（微功耗，20位串行模數(shù)轉換器） |
| 文件頁數(shù)： | 4/36頁 |
| 文件大?。?/td> | 388K |
| 代理商： | LTC2420 |
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4
LTC2420
The
G
denotes specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25
°
C. (Note 3)
f
EOSC
External Oscillator Frequency Range
20-Bit Effective Resolution
12-Bit Effective Resolution
G
G
2.56
2.56
0.2
0.2
130.86
157.03
307.2
2.048
390
390
136.20
163.44
kHz
MHz
μ
s
μ
s
ms
ms
ms
kHz
kHz
t
HEO
t
LEO
t
CONV
External Oscillator High Period
External Oscillator Low Period
Conversion Time
G
G
F
O
= 0V
F
O
= V
CC
External Oscillator (Note 11)
Internal Oscillator (Note 10)
External Oscillator (Notes 10, 11)
(Note 10)
(Note 9)
(Note 9)
(Note 9)
Internal Oscillator (Notes 10, 12)
External Oscillator (Notes 10, 11)
(Note 9)
G
G
G
133.53
160.23
20510/f
EOSC
(in kHz)
19.2
f
EOSC
/8
f
ISCK
Internal SCK Frequency
D
ISCK
f
ESCK
t
LESCK
t
HESCK
t
DOUT_ISCK
Internal SCK Duty Cycle
External SCK Frequency Range
External SCK Low Period
External SCK High Period
Internal SCK 24-Bit Data Output Time
45
55
2000
%
G
kHz
ns
ns
ms
ms
ms
ns
ns
ns
ns
ns
ns
ns
ns
G
250
250
1.23
G
G
G
1.25
1.28
192/f
EOSC
(in kHz)
24/f
ESCK
(in kHz)
t
DOUT_ESCK
t
1
t2
t3
t4
t
KQMAX
t
KQMIN
t
5
t
6
External SCK 24-Bit Data Output Time
CS
↓
to SDO Low Z
CS
↑
to SDO High Z
CS
↓
to SCK
↓
CS
↓
to SCK
↑
SCK
↓
to SDO Valid
SDO Hold After SCK
↓
SCK Set-Up Before CS
↓
SCK Hold After CS
↓
G
G
0
0
0
150
150
150
G
(Note 10)
(Note 9)
G
G
50
G
200
(Note 5)
G
15
50
G
G
50
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Note 1:
Absolute Maximum Ratings are those values beyond which the
life of the device may be impaired.
Note 2:
All voltage values are with respect to GND.
Note 3:
All voltages are with respect to GND. V
CC
= 2.7 to 5.5V unless
otherwise specified. R
SOURCE
= 0
.
Note 4:
Internal Conversion Clock source with the F
O
pin tied
to GND or to V
CC
or to external conversion clock source with
f
EOSC
= 153600Hz unless otherwise specified.
Note 5:
Guaranteed by design, not subject to test.
Note 6:
Integral nonlinearity is defined as the deviation of a code from
a straight line passing through the actual endpoints of the transfer
curve. The deviation is measured from the center of the quantization
band.
Note 7:
F
O
= 0V (internal oscillator) or f
EOSC
= 153600Hz
±
2%
(external oscillator).
Note 8:
F
O
= V
CC
(internal oscillator) or f
EOSC
= 128000Hz
±
2%
(external oscillator).
Note 9:
The converter is in external SCK mode of operation such that
the SCK pin is used as digital input. The frequency of the clock signal
driving SCK during the data output is f
ESCK
and is expressed in kHz.
Note 10:
The converter is in internal SCK mode of operation such that
the SCK pin is used as digital output. In this mode of operation the
SCK pin has a total equivalent load capacitance C
LOAD
= 20pF.
Note 11:
The external oscillator is connected to the F
O
pin. The external
oscillator frequency, f
EOSC
, is expressed in kHz.
Note 12:
The converter uses the internal oscillator.
F
O
= 0V or F
O
= V
CC
.
Note 13:
The output noise includes the contribution of the internal
calibration operations.
Note 14:
For reference voltage values V
REF
> 2.5V the extended input
of –0.125 V
REF
to 1.125 V
REF
is limited by the absolute maximum
rating of the Analog Input Voltage pin (Pin 3). For 2.5V < V
REF
≤
0.267V + 0.89 V
CC
the input voltage range is –0.3V to 1.125 V
REF
.
For 0.267V + 0.89 V
CC
< V
REF
≤
V
CC
the input voltage range is –0.3V
to V
CC
+ 0.3V.
Note 15:
V
CC
(DC) = 4.1V, V
CC
(AC) = 2.8V
P-P
.
TI I G CHARACTERISTICS
U
W
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