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參數(shù)資料
| 型號： | LTC1419ACG |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 3/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC A/D CONV 14BIT SAMPLNG 28SSOP |
| 標準包裝： | 47 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 800k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 240mW |
| 電壓電源： | 雙 ± |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SSOP |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 2 個單端，雙極；1 個差分，雙極 |
11
LTC1419
1419fb
many applications. For example, Figure 7 shows a 1000pF
capacitor from + AIN to ground and a 100 source resistor
to limit the input bandwidth to 1.6MHz. The 1000pF
capacitor also acts as a charge reservoir for the input
sample-and-hold and isolates the ADC input from sam-
pling glitch sensitive circuitry. High quality capacitors and
resistors should be used since these components can add
distortion. NPO and silver mica type dielectric capacitors
have excellent linearity. Carbon surface mount resistors can
also generate distortion from self heating and from damage
that may occur during soldering. Metal film surface mount
resistors are much less susceptible to both problems.
Input Range
The
±2.5V input range of the LTC1419 is optimized for low
noise and low distortion. Most op amps also perform well
over this same range, allowing direct coupling to the
analog inputs and eliminating the need for special transla-
tion circuitry.
Some applications may require other input ranges. The
LTC1419 differential inputs and reference circuitry can
accommodate other input ranges often with little or no
additional circuitry. The following sections describe the
reference and input circuitry and how they affect the input
range.
Internal Reference
The LTC1419 has an on-chip, temperature compensated,
curvature corrected, bandgap reference that is factory
trimmed to 2.500V. It is connected internally to a reference
amplifier and is available at VREF (Pin 3) see Figure 8a. A
APPLICATIONS INFORMATION
WU
U
1
2
3
0.1
F
10
F
ANALOG
INPUT
1419 F08b
LT1019A-2.5
VOUT
VIN
5V
+AIN
–AIN
VREF
LTC1419
AGND
REFCOMP
5
4
+
Figure 8b. Using the LT1019-2.5 as an External Reference
2k resistor is in series with the output so that it can be
easily overdriven by an external reference or other
circuitry, see Figure 8b. The reference amplifier gains the
voltage at the VREF pin by 1.625 to create the required
internal reference voltage. This provides buffering be-
tween the VREF pin and the high speed capacitive DAC. The
reference amplifier compensation pin (REFCOMP, Pin 4)
must be bypassed with a capacitor to ground. The refer-
ence amplifier is stable with capacitors of 1
F or greater.
For the best noise performance, a 10
F ceramic or 10F
tantalum in parallel with a 0.1
F ceramic is recommended.
The VREF pin can be driven with a DAC or other means
shown in Figure 9. This is useful in applications where the
peak input signal amplitude may vary. The input span of
the ADC can then be adjusted to match the peak input
signal, maximizing the signal-to-noise ratio. The filtering
of the internal LTC1419 reference amplifier will limit the
bandwidth and settling time of this circuit. A settling time
of 5ms should be allowed for after a reference adjustment.
Figure 8a. LTC1419 Reference Circuit
Figure 9. Driving VREF with a DAC
LTC1419
+AIN
ANALOG INPUT
1.25V TO 3V
DIFFERENTIAL
–AIN
VREF
REFCOMP
AGND
1419 F09
1
2
3
4
5
10
F
LTC1450
1.25V TO 3V
R2
40k
R3
64k
REFERENCE
AMP
10
F
REFCOMP
AGND
VREF
R1
2k
BANDGAP
REFERENCE
3
4
5
2.500V
4.0625V
LTC1419
1419 F08a
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