参数资料
型号: LTC2440IGN#PBF
厂商: Linear Technology
文件页数: 11/28页
文件大小: 0K
描述: IC ADC DIFFER 24-BIT HS 16-SSOP
标准包装: 100
位数: 24
采样率(每秒): 3.5k
数据接口: MICROWIRE?,串行,SPI?
转换器数目: 2
功率耗散(最大): 40mW
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: 16-SSOP(0.154",3.90mm 宽)
供应商设备封装: 16-SSOP
包装: 管件
输入数目和类型: 1 个差分,双极
产品目录页面: 1348 (CN2011-ZH PDF)
配用: DC570A-ND - BOARD DELTA SIGMA ADC LTC2440
LTC2440
19
2440fd
APPLICATIONS INFORMATION
Figure 10. Internal Serial Clock, Continuous Operation
falling edge of SCK. The internally generated serial clock
is output to the SCK pin. This signal may be used to shift
the conversion result into external circuitry. EOC can be
latched on the rst rising edge of SCK and the last bit of
the conversion result can be latched on the 32nd rising
edge of SCK. After the 32nd rising edge, SDO goes HIGH
(EOC = 1) indicating a new conversion is in progress. SCK
remains HIGH during the conversion.
Normal Mode Rejection and Antialiasing
One of the advantages delta-sigma ADCs offer over
conventional ADCs is on-chip digital ltering. Combined
with a large oversampling ratio, the LTC2440 signicantly
simplies antialiasing lter requirements.
The LTC2440’s speed/resolution is determined by the
over sample ratio (OSR) of the on-chip digital lter. The
OSR ranges from 64 for 3.5kHz output rate to 32,768
for 6.9Hz output rate. The value of OSR and the sample
rate fS determine the lter characteristics of the device.
The rst NULL of the digital lter is at fN and multiples
of fN where fN = fS/OSR, see Figure 11 and Table 5. The
rejection at the frequency fN ±14% is better than 80dB,
see Figure 12.
If fO is grounded, fS is set by the on-chip oscillator at
1.8MHz ±5% (over supply and temperature variations). At
an OSR of 32,768, the rst NULL is at fN = 55Hz and the
no latency output rate is fN/ 8 = 6.9Hz. At the maximum
Figure 11. LTC2440 Normal Mode Rejection (Internal Oscillator)
SDO
BUSY
SCK
(INTERNAL)
CS
LSB24
MSB
SIG
BIT 5
BIT 0
BIT 27
BIT 26
BIT 28
BIT 29
BIT 30
EOC
BIT 31
SLEEP
DATA OUTPUT
CONVERSION
2410 F10
= EXTERNAL OSCILLATOR
= INTERNAL OSCILLATOR
VCC
fO
REF+
REF
SCK
BUSY
IN+
IN
SDO
GND
CS
EXT
2
14
3
4
13
5
6
12
1, 8, 9, 16
11
10
15
SDI
VCC
7
REFERENCE VOLTAGE
0.1V TO VCC
ANALOG INPUT RANGE
–0.5VREF TO 0.5VREF
1μF
4.5V TO 5.5V
LTC2440
2-WIRE
SPI INTERFACE
200nV NOISE, 50/60Hz REJECTION
10-SPEED/RESOLUTION PROGRAMMABLE
2μV NOISE, 880Hz OUTPUT RATE
VCC
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
–60
–40
0
180
2440 F11
–80
–100
60
120
240
–120
–140
–20
NORMAL
MODE
REJECTION
(dB)
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