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参数资料
| 型号： | LTC2356IMSE-14#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/18页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT 3.5MSPS 10-MSOP |
| 标准包装： | 50 |
| 位数： | 14 |
| 采样率（每秒）： | 3.5M |
| 数据接口： | 串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 18mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
| 包装： | 管件 |
| 输入数目和类型： | 2 个单端，双极；1 个差分，双极 |
| 产品目录页面： | 1349 (CN2011-ZH PDF) |
| 配用： | DC1082A-E-ND - BOARD SAR ADC LTC2356-14 |
LTC2356-12/LTC2356-14
13
2356fb
AIN–
LTC2356-14
AIN+
C1
47pF TO
1000pF
1
R1
51
C3
1F
C5
0.1F
5V
–5V
C4
1F
R5
1k
1.5VCM
R3
499
R4
499
R6
1k
C2
47pF TO
1000pF
R2
51
C6
0.1F
VIN
1.25VP-P
MAX
2356 F06a
–
+
U1
1/2 LT1819
–
+
U2
1/2 LT1819
INPUT VOLTAGE (V)
2’S
COMPLEMENT
OUTPUT
CODE
2356 F05
011...111
011...110
011...101
100...000
100...001
100...010
FS – 1LSB
–FS
FREQUENCY (Hz)
100
CMRR
(dB)
0
–20
–40
–60
–80
–100
–120
1k
10k
100k
1M
2356 F04
10M 100M
APPLICATIONS INFORMATION
Figure 3. The voltage of the external reference must be
higher than the 2.5V output of the internal reference. The
recommended range for an external reference is 2.55V to
VDD. An external reference at 2.55V will see a DC quiescent
load of 0.75mA and as much as 3mA during conversion.
INPUT SPAN VERSUS REFERENCE VOLTAGE
The differential input range has a bipolar ± VREF/2
voltage span that equals the difference between the
voltage at the reference buffer output VREF at Pin 3, and
the voltage at the ground (Exposed Pad Ground). The
differential input range of the ADC is ±1.25V when using
the internal reference. The internal ADC is referenced to
these two nodes. This relationship also holds true with
an external reference.
DIFFERENTIAL INPUTS
The LTC2356-12/LTC2356-14 have a unique differential
sample-and-holdcircuitthatmeasuresinputvoltagesfrom
ground to VDD. The ADC will always convert the bipolar
difference of AIN+ – AIN–, independent of the common
mode voltage at the inputs. The common mode rejection
holds up at extremely high frequencies, see Figure 4. The
only requirement is that both inputs not go below ground
or exceed VDD. Integral nonlinearity errors (INL) and dif-
ferential nonlinearity errors (DNL) are largely independent
of the common mode voltage. However, the offset error
will vary. The change in offset error is typically less than
0.1% of the common mode voltage.
Figure 5 shows the ideal input/output characteristics for
the LTC2356-12/LTC2356-14. The code transitions occur
midway between successive integer LSB values (i.e.,
0.5LSB, 1.5LSB, 2.5LSB, FS – 1.5LSB). The output code
is 2’s complement with 1LSB = 2.5V/16384 = 153V for
the LTC2356-14, and 1LSB = 2.5V/4096 = 610V for the
LTC2356-12. The LTC2356-14 has 1LSB RMS of random
white noise. Figure 6a shows the LTC1819 converting a
single ended input signal to differential input signals for
optimum THD and SFDR performance as shown in the
FFT plot (Figure 6b).
Figure 4. CMRR vs Frequency
Figure 5. LTC2356-12/LTC2356-14 Transfer Characteristic
Figure 6a. The LT1819 Driving the LTC2356-14 Differentially
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