Electronic Components Datasheet Search |
|
ADCDS-1405EX Datasheet(PDF) 6 Page - Murata Manufacturing Co., Ltd. |
|
ADCDS-1405EX Datasheet(HTML) 6 Page - Murata Manufacturing Co., Ltd. |
6 / 9 page ADCDS-1405 6 ®® Table 1. Out-of-Range Conditions Table 2. Output Coding OUT OVER UNDER INPUT OF RANGE MSB RANGE RANGE SIGNAL 0 0 0 0 In Range 0 1 0 0 In Range 1 0 0 1 Underrrange 1 1 1 0 Overrange Notes: ➀ Input Amplifier VOUT = (Video Signal - Reference Level) ➁ The video portion of the differential signal (input-amplifier's VOUT) must be more negative than its associated reference level and VOUT should not exceed ±2.8V DC. Video Signal-Reference Signal > –2.80000 >Full Scale –1LSB 11 1111 1111 1111 1 –2.80000 Full Scale –1LSB 11 1111 1111 1111 0 –2.10000 3/4FS 11 0000 0000 0000 0 –1.40000 1/2FS 10 0000 0000 0000 0 –0.70000 1/4FS 01 0000 0000 0000 0 –0.35000 1/8FS 00 1000 0000 0000 0 –0.000171 1 LSB 00 0000 0000 0001 0 0 0 00 0000 0000 0000 0 Video Signal-Reference Signal <0 ➁ <0 00 0000 0000 0000 1 INPUT AMPLIFIER VOUT, ➀ ➀ ➀ ➀ ➀ (VOLTS P-P) SCALE DIGITAL OUTPUT OUT-OF-RANGE Output Coding The ADCDS-1405's output coding is Straight Binary as indicated in Table 2. The table shows the relationship between the output data coding and the difference between the reference signal voltage and its corresponding video signal voltage. (These voltages are referred to the output of the ADCDS-1405's input amplifier's VOUT). Programmable Analog Bandwidth Function When interfacing to CCD arrays with very high-speed "read- out" rates, the ADCDS-1405's input stage must have sufficient analog bandwidth to accurately reproduce the output signals of the CCD array. The amount of analog bandwidth determines how quickly and accurately the "Reference Hold" and the "CDS output" signals will settle. If only a single analog bandwidth was offered, the ADCDS-1405's bandwidth would be set to acquire and digitize CCD output signals to 14-bit accuracy, at maximum conversion rate of 5MHz (200ns see Figure 11. for details). Applications not requiring the maximum conversion rate would be forced to use the full analog bandwidth at the possible expense of noise performance. The ADCDS-1405 avoids this situation by offering a fully programmable analog bandwidth function. The ADCDS-1405 allows the user to "bandwidth limit" the input stage in order to realize the highest level of noise performance (DC noise of 0.3 LSBs rms possible) for the application being considered. Table 3. describes how to select the appropriate reference hold "aquisition time" and CDS output "settling time" needed for a particular application. Each of the selections listed in Table 3. have been optimized to provide only enough analog bandwidth to acquire a full scale input step, to 14-bit accuracy, in a single conversion. Increasing the analog bandwidth (using a faster settling and acquisition time) would only serve to potentially increase the amount of noise at the ADCDS- 1405's output. The ADCDS-1405 uses a two bit digital word to select four different analog bandwidths for the ADCDS-1405's input stage (See Table 3. for details). MSB OUT-OF-RANGE "OVERRANGE" "UNDERRANGE" Figure 8. Overrange/ Underrange Circuit to avoid interaction. The fine gain adjust provides ±256 codes of adjust when ±5V supplies are used for the Fine Gain Adjust Circuit. Out-of-Range Indicator The ADCDS-1405 provides a digital Out-of-Range output signal (pin 24) for situations when the video input signal (saturated signal) is beyond the input range of the internal A/D converter. The digital output bits and the Out-of-Range signal correspond to a particular sampled video input voltage, with both of these signals having a common pipeline delay. Using the circuit described in Figure 8., both overrange and underrange conditions can be detected (see Table 1). When combined with a D/A converter, digital detection and orrection can be performed for both the gain and offset errors. |
Similar Part No. - ADCDS-1405EX |
|
Similar Description - ADCDS-1405EX |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |