參數(shù)資料
型號(hào)： DC979A
廠商： Linear Technology
文件頁數(shù)： 18/32頁
文件大小： 0K
描述： BOARD DELTA SIGMA ADC LTC2442
軟件下載： QuikEval System
設(shè)計(jì)資源： DC979A Design File
DC979A Schematic
標(biāo)準(zhǔn)包裝： 1
系列： QuikEval™
ADC 的數(shù)量： 1
位數(shù)： 24
采樣率（每秒）： 8k
數(shù)據(jù)接口： MICROWIRE?，串行，SPI?
工作溫度： 0°C ~ 70°C
已用 IC / 零件： LTC2442
已供物品： 板
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LTC2442
25
2442fa
For more information www.linear.com/LTC2442
Optimizing Linearity
While the integrated op-amp has rail-to-rail input range, in
order to achieve parts-per-million linearity performance,
the input range and op-amp supply voltages must be con-
sidered. Input levels within 1.25V of the upper op-amp rail
(V+) begin to degrade the performance. For example (see
Figure 15) while operating with V+ = 5.1V and absolute
input voltages (VINCM + VINDIFF) up to 3.75V (VINCM =
2.5V and –2.5V < VINDIFF<2.5V),thelinearityisdegraded
to about 17-bits. Once V+ is increased to 5.25V or greater
the linearity improves to 19-Bits (2ppm). If the reference is
reduced to 4.096V and the input common mode is VREF/2
(2.048V) the linearity performance improves to better
than 1ppm with V+ tied to VCC and V– tied to ground, see
Figure 16. Input signals near ground require about 100mV
headroom on the op-amp power supply in order to achieve
1ppm INL, see Figure 17. Optimal linearity is achieved
by driving the input differentially. As seen in Figure 18, a
single ended input (the negative input is tied to ground)
yields 18-bits (±4ppm) linearity performance. In this case
V– is 100mV below ground.
DIFFERENTIAL VIN (V)
–2.5
INL
(ppm)
2
6
10
1.5
2442 F15
–2
–6
0
4
8
–4
–8
–10
–1.5
–2
–0.5
–1
0.5 1
2
0
2.5
V+ = 5.1V, V– = 0
V+ = 5, V– = 0
V+ = 5, V– = –2
VREF = 5V
VCC = 5V
VINCM = 2.5V
V+ > 5.25, V– = 0, –1, –2
DIFFERENTIAL VIN (V)
–2.048
INL
(ppm)
0
2
2.048
2442 F16
–2
–4
–1.024
0
1.024
–1.536
–0.512
0.512
1.536
4
–1
1
–3
3
VREF = 4.096V
VCC = 5V
VINCM = 2.048V
V+ = 5V, V– = 0V
Figure 15. INL vs Op-Amp Supply Voltage
Figure 16. Linearity vs VIN
DIFFERENTIAL INPUT (V)
–1.25
INL
(ppm)
–0.5
0
0.5
0.25
1.25
2442 F17
–1
–1.5
–2
–0.75
–0.25
0.75
1
1.5
2
VCC = 5V
VREF = 5V
VINCM = 0.625V
V+ = 5V
V– = –100mV
SINGLE ENDED SEL+, SEL– = 0V FIXED
0
INL
(ppm)
1
3
5
2
2442 F18
–1
–3
0
2
4
–2
–4
–5
0.5
1
1.5
2.5
VCC = 5V
VREF = 5V
VIN = VIN+
VIN– = 0V
V+ = 5V
V– = –100mV
Figure 17. Linearity Near Ground
Figure 18. Single-Ended Linearity
applications inForMation
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