參數資料
型號： LTC2435CGN
廠商： LINEAR TECHNOLOGY CORP
元件分類： ADC
英文描述： 20-Bit No Latency ADCs with Differential Input and Differential Reference
中文描述： 1-CH 20-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16
封裝： 0.150 INCH, PLASTIC, SSOP-16
文件頁數： 5/40頁
文件大?。?/td> 463K
代理商： LTC2435CGN
LTC2435/LTC2435-1
5
24351fa
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:
V
CC
= 2.7 to 5.5V unless otherwise specified.
V
REF
= REF
+
– REF
–
, V
REFCM
= (REF
+
+ REF
–
)/2;
V
IN
= IN
+
– IN
–
, V
INCM
= (IN
+
+ IN
–
)/2.
Note 4:
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) for the LTC2435 or f
EOSC
= 139800Hz
±
2% for the
LTC2435-1.
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:
Refer to Offset Accuracy and Drift in the Applications
Information section.
SYMBOL
f
EOSC
t
HEO
t
LEO
t
CONV
PARAMETER
External Oscillator Frequency Range
External Oscillator High Period
External Oscillator Low Period
Conversion Time (LTC2435)
CONDITIONS
MIN
5
0.25
0.25
65.6
78.7
TYP
MAX
2000
200
200
68.3
81.9
UNITS
kHz
●
●
μ
s
μ
s
ms
ms
ms
ms
ms
kHz
kHz
kHz
%
kHz
ns
ns
ms
ms
ms
ms
ns
ns
ns
ns
ns
ns
ns
ns
●
F
O
= 0V
F
O
= V
CC
External Oscillator (Note 11)
F
O
= 0V
External Oscillator (Note 11)
Internal Oscillator (Note 10), LTC2435
Internal Oscillator (Note 10), LTC2435-1
External Oscillator (Notes 10, 11)
(Note 10)
(Note 9)
(Note 9)
(Note 9)
Internal Oscillator (Notes 10, 12), LTC2435
Internal Oscillator (Notes 10, 12), LTC2435-1
●
External Oscillator (Notes 10, 11)
(Note 9)
●
●
●
66.9
80.3
10278/f
EOSC
(in kHz)
73.5
10278/f
EOSC
(in kHz)
19.2
17.5
f
EOSC
/8
Conversion Time (LTC2435-1)
●
●
72
75
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
●
●
250
250
1.22
1.34
●
●
1.25
1.37
1.28
1.40
●
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
↓
●
●
0
0
0
200
200
200
●
(Note 10)
(Note 9)
●
●
50
●
220
(Note 5)
●
15
50
●
●
50
The
●
denotes specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25
°
C. (Note 3)
TI I G CHARACTERISTICS
W
U
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