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| 型号： | DC570A |
| 厂商： | Linear Technology |
| 文件页数： | 1/28页 |
| 文件大小： | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2440 |
| 软件下载： | QuikEval System |
| 设计资源： | DC570A Design File DC570A Schematic |
| 标准包装： | 1 |
| 系列： | QuikEval™ |
| ADC 的数量： | 2 |
| 位数： | 24 |
| 采样率（每秒）： | 3.5k |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 工作温度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2440 |
| 已供物品： | 板 |
| 相关产品： | LTC2440CGN#TRPBF-ND - IC ADC DIFFER 24-BIT HS 16-SSOP LTC2440IGN#TRPBF-ND - IC ADC DIFFER 24-BIT HS 16-SSOP LTC2440IGN#PBF-ND - IC ADC DIFFER 24-BIT HS 16-SSOP LTC2440CGN#PBF-ND - IC ADC DIFFER 24-BIT HS 16-SSOP LTC2440IGN#TR-ND - IC CONV A/D 24-BIT DIFF 16-SSOP LTC2440CGN#TR-ND - IC CONV A/D 24-BIT DIFF 16-SSOP LTC2440IGN-ND - IC ADC DIFFER 24-BIT HS 16-SSOP LTC2440CGN-ND - IC ADC DIFFER 24-BIT HS 16-SSOP |
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LTC2440
1
2440fd
2440 TA01
REFERENCE VOLTAGE
0.1V TO VCC
ANALOG INPUT
–0.5VREF TO 0.5VREF
3-WIRE
SPI INTERFACE
6.9Hz, 200nV NOISE,
50/60Hz REJECTION
880Hz OUTPUT RATE,
2μV NOISE
10-SPEED SERIAL
PROGRAMMABLE
VCC
4.5V TO 5.5V
4
VCC
BUSY
fO
REF+
SCK
IN+
IN–
SDO
GND
CS
EXT
SDI
LTC2440
REF–
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
24-Bit High Speed
Differential Δ∑ ADC with
Selectable Speed/Resolution
The LTC2440 is a high speed 24-bit No Latency Δ∑TM
ADC with 5ppm INL and 5μV offset. It uses proprietary
delta-sigma architecture enabling variable speed and reso-
lution with no latency. Ten speed/resolution combinations
(6.9Hz/200nVRMS to 3.5kHz/25μVRMS) are programmed
through a simple serial interface. Alternatively, by tying a
single pin HIGH or LOW, a fast (880Hz/2μVRMS) or ultralow
noise (6.9Hz, 200nVRMS, 50/60Hz rejection) speed/reso-
lution combination can be easily selected. The accuracy
(offset, full-scale, linearity, drift) and power dissipation
are independent of the speed selected. Since there is no
latency, a speed/resolution change may be made between
conversions with no degradation in performance.
Following each conversion cycle, the LTC2440 automati-
cally enters a low power sleep state. Power dissipation
may be reduced by increasing the duration of this sleep
state. For example, running at the 3.5kHz conversion speed
but reading data at a 100Hz rate draws 240μA average
current (1.1mW) while reading data at a 7Hz output rate
draws only 25μA (125μW).The LTC2440 communicates
through a exible 3-wire or 4-wire digital interface that is
compatible with the LTC2410 and is available in a narrow
16-lead SSOP package.
Simple 24-Bit 2-Speed Acquisition System
n Up to 3.5kHz Output Rate
n Selectable Speed/Resolution
n 2μVRMS Noise at 880Hz Output Rate
n 200nVRMS Noise at 6.9Hz Output Rate with
Simultaneous 50/60Hz Rejection
n 0.0005% INL, No Missing Codes
n Autosleep Enables 20μA Operation at 6.9Hz
n <5μV Offset (4.5V < VCC < 5.5V, –40°C to 85°C)
n Differential Input and Differential Reference with
GND to VCC Common Mode Range
n No Latency, Each Conversion is Accurate Even After
an Input Step
n Internal Oscillator—No External Components
n Pin Compatible with the LTC2410
n 24-Bit ADC in Narrow 16-Lead SSOP Package
n High Speed Multiplexing
n Weight Scales
n Auto Ranging 6-Digit DVMs
n Direct Temperature Measurement
n High Speed Data Acquisition
Speed vs RMS Noise
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
No Latency Δ∑ is a trademark of Linear Technology Corporation. All other trademarks are
the property of their respective owners.
CONVERSION RATE (Hz)
1
0.1
RMS
NOISE
(μV)
1
10
100
10
100
2440 TA02
1000
10000
VCC = 5V
VREF = 5V
VIN
+ = VIN– = 0V
2μV AT 880Hz
200nV AT 6.9Hz
(50/60Hz REJECTION)
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