लाइनियर टेक्नॉलॉजी LTC2433-1CMS मूल्यांकन किट वापरकर्ता मार्गदर्शक

DC590 सिरीयल कंट्रोलरशी कनेक्शन
An external conversion clock may be applied to the Fo turret to modify the frequency rejection characteristics or data output rate of the LTC2433-1. Be sure to remove JP4 before applying an external clock. Refer to the LTC2433-1 data sheet for more information.

ॲनालॉग कनेक्शन
Analog signal connections are made via the row of turret posts along the edge of the board. Use exposed ground planes along the edges of the board for solid ground connections.

प्रयोग

इनपुट गोंगाट
Solder a short wire from the IN-turret post to the IN+ turret post to check noise levels.

सामान्य मोड नकार
Tie the two inputs together and to ground or REF+ to test common-mode rejection.

द्विध्रुवीय सममिती
To demonstrate symmetry, connect a stable, low-noise, floating voltage source with a voltage Vref/2 पेक्षा कमी.

वर्णन

Demonstration circuit 745 features the LTC2433-1, a 16-bit high-performance ∆Σ analog-to-digital converter (ADC). The LTC2433-1 features 0.12 LSB linearity, 0.16 LSB full-scale accuracy, 5µV offset, and 1.45µV RMS noise. The inputs and reference are fully differential, with input common mode rejection of 140 dB. The LTC2433-1 is available in a 110-pin MSOP package and has an easy-to-use SPI interface.
DC745 is a member of Linear Technology‘s QuickEval™ family of demonstration boards. It is designed to allow easy evaluation of the LTC2433-1 and may be connected directly to the target application’s analog signals while using the DC590 USB Serial Controller board and supplied software to measure performance. The exposed ground planes allow proper grounding to prototype circuitry. After evaluating with Linear Technology’s software, the digital signals can be connected to the end application’s processor/controller for the development of the serial interface.

रचना files या सर्किट बोर्डसाठी उपलब्ध आहेत. एलटीसी कारखान्याला कॉल करा.

त्वरित प्रारंभ प्रक्रिया

Connect DC745 to a DC590 USB Serial Controller using the supplied 14-conductor ribbon cable. Connect DC590 to a host PC with a standard USB A/B cable. Run the evaluation software supplied with DC590 or downloaded from http://www.linear.com/software. The correct program will be loaded automatically. Click the COLLECT button to start reading the input voltage.

Details on software features are documented in the control panel’s help menu.

डेटा लॉगिंग करण्यासाठी, संदर्भ खंड बदलण्यासाठी साधने उपलब्ध आहेतtage, स्ट्रिप चार्ट आणि हिस्टोग्राममधील पॉइंट्सची संख्या बदलणे आणि DVM डिस्प्लेसाठी सरासरी पॉइंट्सची संख्या बदलणे.

हार्डवेअर सेट-अप

जंपर्स

JP1 – Select the source for REF+, either external or 5.00 volts from the onboard LT1236 reference (default).P2 – Select the source for REF-, either external or Ground (0 volts, default).
JP3 – Trigger mode, either normal (default) or externally triggered.

JP4 – Notch frequency. Connect to 60Hz for normal operation (Fo = GND). The LTC2433-1 is trimmed to reject both 50Hz and 60Hz by at least 87dB when Fo is grounded. Remove this jumper when supplying an external clock to the Fo turret.
JP5 – Trigger input signal. Pin 1 is a 5-volt logic signal, and pin 2 is ground. When triggered mode is selected on JP3, a rising edge starts a new conversion. Note that a conversion in progress cannot be stopped, so this signal can only be used to slow down the rate at which sampLTC2433-1 वरून les वाचले जातात. जेव्हा Fo ग्राउंड केले जाते, तेव्हा कमाल ट्रिगर वारंवारता 5Hz असते.

DC590 सिरीयल कंट्रोलरशी कनेक्शन

J2 is the power and digital interface connector. Connect to the C590 serial controller with the supplied 14-conductor ribbon cable.
An external conversion clock may be applied to the Fo turret to modify the frequency rejection characteristics or data output rate of the LTC2433-1. Be sure to remove JP4 before applying an external clock. This should be a square wave with a low level equal to ground and a high level equal to Vcc. While up to a 2MHz clock can be used, performance may be compromised. Refer to the LTC2433-1 data sheet.

अॅनालॉग कनेक्शन

बोर्डच्या काठावर असलेल्या बुर्ज पोस्टच्या रांगेद्वारे अॅनालॉग सिग्नल कनेक्शन केले जातात. तसेच, बोर्डला विद्यमान सर्किटशी जोडताना, बोर्डच्या कडांवरील उघड्या ग्राउंड प्लेनचा वापर ग्राउंड्समध्ये एक ठोस कनेक्शन तयार करण्यासाठी केला जाऊ शकतो.

GND – Ground turrets are connected directly to the internal ground planes.
VCC - हा ADC साठी पुरवठा आहे. या बिंदूपासून कोणतीही शक्ती काढू नका.

REF+, REF- ––these are connected to the LTC2433-1 REF+ and REF- pins. If the onboard reference is being used, the reference voltage या बिंदूपासून निरीक्षण केले जाऊ शकते. बाह्य संदर्भासाठी JP1 आणि JP2 कॉन्फिगर केले असल्यास बाह्य संदर्भ या टर्मिनल्सशी कनेक्ट केले जाऊ शकतात.
IN+, IN–– These are the differential inputs to the LTC2433-1.

अनुभव

इनपुट आवाज

One of the characteristics of the LTC2433-1 is that the 1.45µV input noise floor is far below the quantization level of 76 µV when a 5-volt reference is used. This means that the output will be stable if the input noise level is also below 76uV. In this sense, the LTC2433-1 is a true 16 effective bit part, whereas many 16-bit SAR converters have several LSBs of noise.
Solder a short wire from the IN turret post to the IN+ turret post. Noise should be below the quantization level of the LTC2433-1. This will result in a noise reading of zero on the control software.

Applying an external reference of 100mV results in a 1.52µV LSB, and the noise reading will be approximately 250 ppm of 100mV, or 2.5µV. This is slightly higher than the 1.45µV input thermal because quantization noise is also a factor.

सामान्य मोड नकार
Tie the two inputs (still connected) to ground through a short wire and note the indicated voltage. इनपुट REF+ ला बांधा; LTC1-130 च्या 2433 dB CMRR मुळे फरक 1LSB पेक्षा कमी असावा.

द्विध्रुवीय सममिती

To demonstrate the symmetry of the ADC’s transfer function, connect a stable, low-noise, floating voltagई स्रोत (खंड सहtagई Vref/2 पेक्षा कमी) IN+ ते IN- आणि सूचित खंड लक्षात घ्याtage ध्रुवीयपणा उलटा; सूचित खंडtage will typically be within one LSB of the first reading multiplied by 1.
एक सोयीस्कर खंडtage source for this experiment is a single alkaline battery. While a battery has fairly low noise, it is sensitive to temperature drift. It is best to use a large (D-size) battery that is insulated from air currents. A better source is a battery-powered series reference such as the LT1790. This part is available with output voltages of 1.25V, 2.048V, 2.5V, 3V, 3.3V, 4.096V, and 5V.

इनपुट सामान्य मोड नकार

The LTC2433-1’s SINC4 digital filter is trimmed to strongly reject 50 or 60Hz line noise when operated with the internal conversion clock. To measure input normal mode rejection, connect IN- to a 2222.5-volt source such as an LT1790-2.5 reference or a power supply. Apply a 10Hz, 2V peak-to-peak sine wave to IN+ through a 1uF capacitor. No DC bias is required because the 2-3MΩ input impedance of the LTC2433-1 tends to self-bias the input to mid-reference (see datasheet applications information for details).
डेटा घेणे सुरू करा. इनपुट आवाज बराच मोठा असेल आणि आउटपुट वि. वेळेचा आलेख मोठ्या फरक दर्शवेल.
पुढे, हळूहळू वारंवारता 60Hz पर्यंत वाढवा. आलेखात आवाज जवळजवळ ओळखता येणार नाही असा असावा. लक्षात ठेवा की ppm मध्ये दर्शविलेला आवाज डेटाशीट स्पेसिफिकेशनपेक्षा जास्त असू शकतो कारण इनपुट DC स्रोताशी जोडलेले नाहीत.

वरून डाउनलोड केले बाण.com.

वारंवार विचारले जाणारे प्रश्न

प्रश्न: मी २MHz पेक्षा जास्त फ्रिक्वेन्सी असलेले बाह्य घड्याळ वापरू शकतो का?
A: While up to a 2MHz clock can be used, performance may be compromised. Refer to the LTC2433-1 data sheet for more information.
प्रश्न: मी संदर्भ खंड कसा बदलू?tage?
A: Tools are available in the software for changing the reference voltage. Refer to the software documentation for detailed instructions.
प्रश्न: प्रयोग विभागात इनपुट ग्राउंड किंवा REF+ ला बांधण्याचा उद्देश काय आहे?
A: This is done to test the common-mode rejection capabilities of the LTC2433-1.

कागदपत्रे / संसाधने

लाइनियर टेक्नॉलॉजी LTC2433-1CMS मूल्यांकन किट [pdf] वापरकर्ता मार्गदर्शक
DC745, DC590, LTC2433-1CMS मूल्यांकन किट, LTC2433-1CMS, मूल्यांकन किट, किट

संदर्भ

वापरकर्ता मॅन्युअल

लाइनियर टेक्नॉलॉजी LTC2433-1CMS मूल्यांकन किट

तपशील

उत्पादन वापर सूचना