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參數(shù)資料
| 型號： | LTC2496IUHF#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 19/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 16BIT DELTA SIG 38-QFN |
| 標準包裝： | 2,500 |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 6.9 |
| 數(shù)據(jù)接口： | MICROWIRE?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 800µW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 38-WFQFN 裸露焊盤 |
| 供應商設備封裝： | 38-QFN（5x7） |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 16 個單端，雙極；8 個差分，雙極 |
| 配用： | DC1011A-B-ND - BOARD DELTA SIGMA ADC LTC2496 |
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LTC2496
2496fb
applicaTions inForMaTion
In cases where large bypass capacitors are required on
the reference inputs (CREF > 0.01F), full-scale and linear-
ity errors are proportional to the value of the reference
resistance. Every ohm of reference resistance produces
a full-scale error of approximately 0.5ppm, see Figures
14 and 15. If the input common mode voltage is equal to
the reference common mode voltage, a linearity error of
approximately 0.67ppm per 100
Ω of reference resistance
results, see Figure 16. In applications where the input and
reference common mode voltages are different, the errors
increase. A 1V difference in between common mode input
andcommonmodereferenceresultsina6.7ppmINLerror
for every 100
Ω of reference resistance.
In addition to the reference sampling charge, the reference
RSOURCE ( )
0
+FS
ERROR
(ppm) 300
400
500
800
2496 F14
200
100
0
200
400
600
1000
VCC = 5V
VREF = 5V
VIN+ = 3.75V
VIN– = 1.25V
fO = GND
TA = 25°C
CREF = 1F, 10F
CREF = 0.1F
CREF = 0.01F
RSOURCE ( )
0
–FS
ERROR
(ppm) –200
–100
0
800
2496 F15
–300
–400
–500
200
400
600
1000
VCC = 5V
VREF = 5V
VIN+ = 1.25V
VIN– = 3.75V
fO = GND
TA = 25°C
CREF = 1F, 10F
CREF = 0.1F
CREF = 0.01F
Figure 14. +FS Error vs RSOURCE at VREF (Large CREF)
Figure 15. –FS Error vs RSOURCE at VREF (Large CREF)
VIN/VREF (V)
–0.5
INL
(ppm
OF
V
REF
)
2
6
10
0.3
2496 F16
–2
–6
0
4
8
–4
–8
–10
–0.3
–0.1
0.1
0.5
VCC = 5V
VREF = 5V
VIN(CM) = 2.5V
TA = 25°C
CREF = 10F
R = 1k
R = 100
R = 500
Figure 16. INL vs Differential Input Voltage and Reference
Source Resistance for CREF > 1F
ESDprojectiondiodeshaveatemperaturedependentleak-
age current. This leakage current, nominally 1nA (±10nA
max) results in a small gain error. A 100
Ω reference
resistance will create a 0.5V full scale error.
Normal Mode Rejection and Anti-aliasing
One of the advantages delta-sigma ADCs offer over
conventional ADCs is on-chip digital filtering. Combined
with a large oversample ratio, the LTC2496 significantly
simplifies anti-aliasing filter requirements. Additionally,
the input current cancellation feature allows external low
pass filtering without degrading the DC performance of
the device.
The SINC4 digital filter provides excellent normal mode
rejection at all frequencies except DC and integer multiples
of the modulator sampling frequency (fS). The modulator
sampling frequency is fS = 15,360Hz while operating with
its internal oscillator and fS = fEOSC/20 when operating
with an external oscillator of frequency fEOSC.
Whenusingtheinternaloscillator,theLTC2496isdesigned
to reject line frequencies. As shown in Figure 17, rejection
nulls occur at multiples of frequency fN, where fN is 55Hz
for simultaneous 50Hz/60Hz rejection). Multiples of the
modulator sampling rate (fS = fN 256) only reject noise
to 15dB (see Figure 18), if noise sources are present at
these frequencies anti-aliasing will reduce their effects.
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