参数资料
型号: LTC1603CG#PBF
厂商: Linear Technology
文件页数: 6/20页
文件大小: 0K
描述: IC ADC SMPL SHTDWN 16BIT 36-SSOP
标准包装: 37
位数: 16
采样率(每秒): 250k
数据接口: 并联
转换器数目: 1
功率耗散(最大): 350mW
电压电源: 模拟和数字,双 ±
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 36-SSOP(0.209",5.30mm 宽)
供应商设备封装: 36-SSOP
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: 1346 (CN2011-ZH PDF)
14
LTC1603
1603f
APPLICATIONS INFORMATION
WU
U
LTC1603
AIN
+
ANALOG INPUT
2V TO 2.7V
DIFFERENTIAL
AIN
VREF
REFCOMP
AGND
1603 F13
1
2
3
4
5
47
F
LTC1450
2V TO 2.7V
Figure 14a. CMRR vs Input Frequency
INPUT FREQUENCY (Hz)
1k
COMMON
MODE
REJECTION
(dB)
80
70
60
50
40
30
20
10
0
10k
100k
1603 G14a
1M
Figure 13. Driving VREF with a DAC
can not exceed the AVDD or VSS power supply voltages.
Integral nonlinearity errors (INL) and differential nonlin-
earity errors (DNL) are independent of the common mode
voltage, however, the bipolar zero error (BZE) will vary.
The change in BZE is typically less than 0.1% of the
common mode voltage. Dynamic performance is also
affected by the common mode voltage. THD will degrade
as the inputs approach either power supply rail, from 96dB
with a common mode of 0V to 86dB with a common mode
of 2.5V or – 2.5V.
Differential inputs allow greater flexibility for accepting
different input ranges. Figure 14b shows a circuit that
converts a 0V to 5V analog input signal with only an
additional buffer that is not in the signal path.
LTC1603
AIN
+
AIN
VREF
0V TO
5V
±2.5V
REFCOMP
AGND
1603 F14b
1
2
3
4
5
10
F
ANALOG INPUT
+
Figure 14b. Selectable 0V to 5V or
±2.5V Input Range
Full-Scale and Offset Adjustment
Figure 15a shows the ideal input/output characteristics
for the LTC1603. The code transitions occur midway
between successive integer LSB values (i.e., – FS +
0.5LSB, – FS + 1.5LSB, – FS + 2.5LSB,... FS – 1.5LSB,
FS – 0.5LSB). The output is two’s complement binary with
1LSB = FS – (– FS)/65536 = 5V/65536 = 76.3
V.
In applications where absolute accuracy is important,
offset and full-scale errors can be adjusted to zero. Offset
error must be adjusted before full-scale error. Figure 15b
shows the extra components required for full-scale error
adjustment. Zero offset is achieved by adjusting the offset
applied to the AIN– input. For zero offset error apply
1603 F15a
011...111
011...110
000...001
000...000
111...111
111...110
100...001
100...000
FS – 1LSB
– (FS – 1LSB)
INPUT VOLTAGE (AIN
+ – A
IN
)
OUTPUT
CODE
Figure 15a. LTC1603 Transfer Characteristics
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