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參數(shù)資料
| 型號(hào)： | LTC2428IG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 4-/8-Channel 20-Bit uPower No Latency ADCs |
| 中文描述： | 8-CH 20-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO28 |
| 封裝： | 0.209 INCH, PLASTIC, SSOP-28 |
| 文件頁(yè)數(shù)： | 13/28頁(yè) |
| 文件大?。?/td> | 317K |
| 代理商： | LTC2428IG |
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13
LTC2424/LTC2428
data rate with a 5V reference. The relationship between the
output data rate (ODR) and the frequency applied to the F
O
pin (F
O
) is:
ODR = F
O
/20480
For output data rates up to 50 samples/second, the total
unadjusted error (TUE) is better than 16 bits, and better
than 12 bits at 100 samples/second. As shown in Figure 8,
for output data rates of 100 samples/second, the TUE is
better than 15 bits for V
REF
below 2.5V. Figure 9 shows an
unaveraged total unadjusted error for the LTC2424 or
LTC2428 operating at 100 samples/second with V
REF
=
2.5V. Figure 10 shows the same device operating with a 5V
reference and an output data rate of 7.5 samples/second.
Operation at Higher Data Output Rates
The LTC2424/LTC2428 typically operate with an internal
oscillator of 153.6kHz. This corresponds to a notch fre-
quency of 60Hz and an output rate of 7.5 samples/second.
The internal oscillator is enabled if the F
O
pin is logic LOW
(logic HIGH for a 50Hz notch). It is possible to drive the F
O
pin with an external oscillator for higher data output rates.
As shown in Figure 6, an external clock of 2.048MHz
applied to the F
O
pin results in a notch frequency of 800Hz
with a data output rate of 100 samples/second.
Figure 7 shows the total unadjusted error (Offset Error +
Full-Scale Error + INL + DNL) as a function of the output
APPLICATIO
S I
FOR
ATIO
U
W
U
U
OUTPUT RATE (SAMPLES/SEC)
0
T
96
128
160
12 BITS
13 BITS
14 BITS
16 BITS
24248 F07
64
32
0
50
100
192
224
256
V
REF
= 5V
150
Figure 7. Total Error vs Output Rate (V
REF
= 5V)
LTC2424
C9
0.1
μ
F
HCO4
2
HCO4
C7
10pF
C6
270pF
C8 5pF
R7 5k
R6 47k
R8 1k
10k
10 TVEN POT
SWITCH
R9 1k
5V
6
12
10
5
7
3
4
1
13
11
8
9
24248 F06
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
GND
V
CC
FS
SET
ADCIN
ZS
SET
GND
MUXOUT
V
CC
CH0
CH1
CH2
CH3
NC
NC
GND
GND
F
O
SCK
SDO
CSADC
GND
D
IN
CSMUX
CLK
GND
NC
GND
NC
+
Figure 6. Selectable 100 Sample/Second Turbo Mode
REFERENCE VOLTAGE (V)
1.0
T
128
192
5.0
24248 F08
64
0
2.0
3.0
4.0
1.5
2.5
3.5
4.5
256
96
160
32
224
OUTPUT RATE = 100sps
12 BITS
13 BITS
14 BITS
15 BITS
Figure 8. Total Error vs V
REF
(Output Rate = 100sps)
INPUT VOLTAGE (V)
0
–40
T
–30
–25
–20
–15
–10
–5
24248 F09
0
5
10
–35
2.5
V
CC
= 5V
V
REF
= 2.5V
Figure 9. Total Unadjusted Error at
100 Samples/Second (No Averaging)
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| LTC2428IG#PBF | 功能描述:IC ADC 20BIT 8CH MICROPWR 28SSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個(gè)單端，單極 |
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