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參數(shù)資料
| 型號： | LTC1603IG#TR |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CONV A/D 16BIT 250KSPS 36SSOP |
| 標準包裝： | 2,000 |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 250k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 350mW |
| 電壓電源： | 模擬和數(shù)字，雙 ± |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 36-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 36-SSOP |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 2 個單端，雙極；1 個差分，雙極 |
1603f
13
LTC1603
APPLICATIONS INFORMATION
WU
U
LTC1603
AIN
+
AIN
–
VREF
REFCOMP
AGND
1603 F11
1
2
3
4
5
47
F
3000pF
100
ANALOG INPUT
Figure 11. RC Input Filter
Input Range
The
±2.5V input range of the LTC1603 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
LTC1603 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 LTC1603 has an on-chip, temperature compensated,
curvature corrected, bandgap reference that is factory
trimmed to 2.500V. It is connected internally to a refer-
ence amplifier and is available at VREF (Pin 3) (see Figure
12a). A 7.5k resistor is in series with the output so that it
can be easily overdriven by an external reference or other
circuitry (see Figure 12b). The reference amplifier gains
the voltage at the VREF pin by 1.75 to create the required
internal reference voltage. This provides buffering
between 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
reference amplifier is stable with capacitors of 22
F or
greater. For the best noise performance a 47
F ceramic
or 47
F tantalum in parallel with a 0.1F ceramic is
recommended.
R2
12k
R3
16k
REFERENCE
AMP
47
F
REFCOMP
AGND
VREF
R1
7.5k
3
4
5
2.500V
4.375V
LTC1603
1603 F12a
BANDGAP
REFERENCE
Figure 12a. LTC1603 Reference Circuit
1
2
3
0.1
F
10
F
ANALOG
INPUT
1603 F12b
LT1019A-2.5
VOUT
VIN
5V
AIN
+
AIN
–
VREF
LTC1603
AGND
REFCOMP
5
4
+
Figure 12b. Using the LT1019-2.5 as an External Reference
The VREF pin can be driven with a DAC or other means
shown in Figure 13. 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 LTC1603 reference amplifier will limit
the bandwidth and settling time of this circuit. A settling
time of 20ms should be allowed for after a reference
adjustment.
Differential Inputs
The LTC1603 has a unique differential sample-and-hold
circuit that allows rail-to-rail inputs. The ADC will always
convert the difference of AIN+ – AIN– independent of the
common mode voltage (see Figure 15a). The common
mode rejection holds up to extremely high frequencies
(see Figure 14a). The only requirement is that both inputs
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